1 /* mg.c 2 * 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others 5 * 6 * You may distribute under the terms of either the GNU General Public 7 * License or the Artistic License, as specified in the README file. 8 * 9 */ 10 11 /* 12 * Sam sat on the ground and put his head in his hands. 'I wish I had never 13 * come here, and I don't want to see no more magic,' he said, and fell silent. 14 * 15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"] 16 */ 17 18 /* 19 =head1 Magical Functions 20 21 "Magic" is special data attached to SV structures in order to give them 22 "magical" properties. When any Perl code tries to read from, or assign to, 23 an SV marked as magical, it calls the 'get' or 'set' function associated 24 with that SV's magic. A get is called prior to reading an SV, in order to 25 give it a chance to update its internal value (get on $. writes the line 26 number of the last read filehandle into to the SV's IV slot), while 27 set is called after an SV has been written to, in order to allow it to make 28 use of its changed value (set on $/ copies the SV's new value to the 29 PL_rs global variable). 30 31 Magic is implemented as a linked list of MAGIC structures attached to the 32 SV. Each MAGIC struct holds the type of the magic, a pointer to an array 33 of functions that implement the get(), set(), length() etc functions, 34 plus space for some flags and pointers. For example, a tied variable has 35 a MAGIC structure that contains a pointer to the object associated with the 36 tie. 37 38 */ 39 40 #include "EXTERN.h" 41 #define PERL_IN_MG_C 42 #include "perl.h" 43 44 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS) 45 # ifdef I_GRP 46 # include <grp.h> 47 # endif 48 #endif 49 50 #if defined(HAS_SETGROUPS) 51 # ifndef NGROUPS 52 # define NGROUPS 32 53 # endif 54 #endif 55 56 #ifdef __hpux 57 # include <sys/pstat.h> 58 #endif 59 60 #ifdef HAS_PRCTL_SET_NAME 61 # include <sys/prctl.h> 62 #endif 63 64 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO) 65 Signal_t Perl_csighandler(int sig, siginfo_t *, void *); 66 #else 67 Signal_t Perl_csighandler(int sig); 68 #endif 69 70 #ifdef __Lynx__ 71 /* Missing protos on LynxOS */ 72 void setruid(uid_t id); 73 void seteuid(uid_t id); 74 void setrgid(uid_t id); 75 void setegid(uid_t id); 76 #endif 77 78 /* 79 * Pre-magic setup and post-magic takedown. 80 * Use the "DESTRUCTOR" scope cleanup to reinstate magic. 81 */ 82 83 struct magic_state { 84 SV* mgs_sv; 85 I32 mgs_ss_ix; 86 U32 mgs_magical; 87 bool mgs_readonly; 88 bool mgs_bumped; 89 }; 90 /* MGS is typedef'ed to struct magic_state in perl.h */ 91 92 STATIC void 93 S_save_magic(pTHX_ I32 mgs_ix, SV *sv) 94 { 95 dVAR; 96 MGS* mgs; 97 bool bumped = FALSE; 98 99 PERL_ARGS_ASSERT_SAVE_MAGIC; 100 101 assert(SvMAGICAL(sv)); 102 103 /* we shouldn't really be called here with RC==0, but it can sometimes 104 * happen via mg_clear() (which also shouldn't be called when RC==0, 105 * but it can happen). Handle this case gracefully(ish) by not RC++ 106 * and thus avoiding the resultant double free */ 107 if (SvREFCNT(sv) > 0) { 108 /* guard against sv getting freed midway through the mg clearing, 109 * by holding a private reference for the duration. */ 110 SvREFCNT_inc_simple_void_NN(sv); 111 bumped = TRUE; 112 } 113 114 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix)); 115 116 mgs = SSPTR(mgs_ix, MGS*); 117 mgs->mgs_sv = sv; 118 mgs->mgs_magical = SvMAGICAL(sv); 119 mgs->mgs_readonly = SvREADONLY(sv) && !SvIsCOW(sv); 120 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */ 121 mgs->mgs_bumped = bumped; 122 123 SvMAGICAL_off(sv); 124 /* Turning READONLY off for a copy-on-write scalar (including shared 125 hash keys) is a bad idea. */ 126 if (!SvIsCOW(sv)) SvREADONLY_off(sv); 127 } 128 129 /* 130 =for apidoc mg_magical 131 132 Turns on the magical status of an SV. See C<sv_magic>. 133 134 =cut 135 */ 136 137 void 138 Perl_mg_magical(pTHX_ SV *sv) 139 { 140 const MAGIC* mg; 141 PERL_ARGS_ASSERT_MG_MAGICAL; 142 PERL_UNUSED_CONTEXT; 143 144 SvMAGICAL_off(sv); 145 if ((mg = SvMAGIC(sv))) { 146 do { 147 const MGVTBL* const vtbl = mg->mg_virtual; 148 if (vtbl) { 149 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP)) 150 SvGMAGICAL_on(sv); 151 if (vtbl->svt_set) 152 SvSMAGICAL_on(sv); 153 if (vtbl->svt_clear) 154 SvRMAGICAL_on(sv); 155 } 156 } while ((mg = mg->mg_moremagic)); 157 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG))) 158 SvRMAGICAL_on(sv); 159 } 160 } 161 162 /* 163 =for apidoc mg_get 164 165 Do magic before a value is retrieved from the SV. The type of SV must 166 be >= SVt_PVMG. See C<sv_magic>. 167 168 =cut 169 */ 170 171 int 172 Perl_mg_get(pTHX_ SV *sv) 173 { 174 dVAR; 175 const I32 mgs_ix = SSNEW(sizeof(MGS)); 176 bool saved = FALSE; 177 bool have_new = 0; 178 MAGIC *newmg, *head, *cur, *mg; 179 180 PERL_ARGS_ASSERT_MG_GET; 181 182 if (PL_localizing == 1 && sv == DEFSV) return 0; 183 184 /* We must call svt_get(sv, mg) for each valid entry in the linked 185 list of magic. svt_get() may delete the current entry, add new 186 magic to the head of the list, or upgrade the SV. AMS 20010810 */ 187 188 newmg = cur = head = mg = SvMAGIC(sv); 189 while (mg) { 190 const MGVTBL * const vtbl = mg->mg_virtual; 191 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */ 192 193 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) { 194 195 /* taint's mg get is so dumb it doesn't need flag saving */ 196 if (!saved && mg->mg_type != PERL_MAGIC_taint) { 197 save_magic(mgs_ix, sv); 198 saved = TRUE; 199 } 200 201 vtbl->svt_get(aTHX_ sv, mg); 202 203 /* guard against magic having been deleted - eg FETCH calling 204 * untie */ 205 if (!SvMAGIC(sv)) { 206 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */ 207 break; 208 } 209 210 /* recalculate flags if this entry was deleted. */ 211 if (mg->mg_flags & MGf_GSKIP) 212 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; 213 } 214 else if (vtbl == &PL_vtbl_utf8) { 215 /* get-magic can reallocate the PV */ 216 magic_setutf8(sv, mg); 217 } 218 219 mg = nextmg; 220 221 if (have_new) { 222 /* Have we finished with the new entries we saw? Start again 223 where we left off (unless there are more new entries). */ 224 if (mg == head) { 225 have_new = 0; 226 mg = cur; 227 head = newmg; 228 } 229 } 230 231 /* Were any new entries added? */ 232 if (!have_new && (newmg = SvMAGIC(sv)) != head) { 233 have_new = 1; 234 cur = mg; 235 mg = newmg; 236 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */ 237 } 238 } 239 240 if (saved) 241 restore_magic(INT2PTR(void *, (IV)mgs_ix)); 242 243 return 0; 244 } 245 246 /* 247 =for apidoc mg_set 248 249 Do magic after a value is assigned to the SV. See C<sv_magic>. 250 251 =cut 252 */ 253 254 int 255 Perl_mg_set(pTHX_ SV *sv) 256 { 257 dVAR; 258 const I32 mgs_ix = SSNEW(sizeof(MGS)); 259 MAGIC* mg; 260 MAGIC* nextmg; 261 262 PERL_ARGS_ASSERT_MG_SET; 263 264 if (PL_localizing == 2 && sv == DEFSV) return 0; 265 266 save_magic(mgs_ix, sv); 267 268 for (mg = SvMAGIC(sv); mg; mg = nextmg) { 269 const MGVTBL* vtbl = mg->mg_virtual; 270 nextmg = mg->mg_moremagic; /* it may delete itself */ 271 if (mg->mg_flags & MGf_GSKIP) { 272 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */ 273 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0; 274 } 275 if (PL_localizing == 2 276 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type)) 277 continue; 278 if (vtbl && vtbl->svt_set) 279 vtbl->svt_set(aTHX_ sv, mg); 280 } 281 282 restore_magic(INT2PTR(void*, (IV)mgs_ix)); 283 return 0; 284 } 285 286 /* 287 =for apidoc mg_length 288 289 This function is deprecated. 290 291 It reports on the SV's length in bytes, calling length magic if available, 292 but does not set the UTF8 flag on the sv. It will fall back to 'get' 293 magic if there is no 'length' magic, but with no indication as to 294 whether it called 'get' magic. It assumes the sv is a PVMG or 295 higher. Use sv_len() instead. 296 297 =cut 298 */ 299 300 U32 301 Perl_mg_length(pTHX_ SV *sv) 302 { 303 dVAR; 304 MAGIC* mg; 305 STRLEN len; 306 307 PERL_ARGS_ASSERT_MG_LENGTH; 308 309 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { 310 const MGVTBL * const vtbl = mg->mg_virtual; 311 if (vtbl && vtbl->svt_len) { 312 const I32 mgs_ix = SSNEW(sizeof(MGS)); 313 save_magic(mgs_ix, sv); 314 /* omit MGf_GSKIP -- not changed here */ 315 len = vtbl->svt_len(aTHX_ sv, mg); 316 restore_magic(INT2PTR(void*, (IV)mgs_ix)); 317 return len; 318 } 319 } 320 321 (void)SvPV_const(sv, len); 322 return len; 323 } 324 325 I32 326 Perl_mg_size(pTHX_ SV *sv) 327 { 328 MAGIC* mg; 329 330 PERL_ARGS_ASSERT_MG_SIZE; 331 332 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { 333 const MGVTBL* const vtbl = mg->mg_virtual; 334 if (vtbl && vtbl->svt_len) { 335 const I32 mgs_ix = SSNEW(sizeof(MGS)); 336 I32 len; 337 save_magic(mgs_ix, sv); 338 /* omit MGf_GSKIP -- not changed here */ 339 len = vtbl->svt_len(aTHX_ sv, mg); 340 restore_magic(INT2PTR(void*, (IV)mgs_ix)); 341 return len; 342 } 343 } 344 345 switch(SvTYPE(sv)) { 346 case SVt_PVAV: 347 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */ 348 case SVt_PVHV: 349 /* FIXME */ 350 default: 351 Perl_croak(aTHX_ "Size magic not implemented"); 352 break; 353 } 354 return 0; 355 } 356 357 /* 358 =for apidoc mg_clear 359 360 Clear something magical that the SV represents. See C<sv_magic>. 361 362 =cut 363 */ 364 365 int 366 Perl_mg_clear(pTHX_ SV *sv) 367 { 368 const I32 mgs_ix = SSNEW(sizeof(MGS)); 369 MAGIC* mg; 370 MAGIC *nextmg; 371 372 PERL_ARGS_ASSERT_MG_CLEAR; 373 374 save_magic(mgs_ix, sv); 375 376 for (mg = SvMAGIC(sv); mg; mg = nextmg) { 377 const MGVTBL* const vtbl = mg->mg_virtual; 378 /* omit GSKIP -- never set here */ 379 380 nextmg = mg->mg_moremagic; /* it may delete itself */ 381 382 if (vtbl && vtbl->svt_clear) 383 vtbl->svt_clear(aTHX_ sv, mg); 384 } 385 386 restore_magic(INT2PTR(void*, (IV)mgs_ix)); 387 return 0; 388 } 389 390 static MAGIC* 391 S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags) 392 { 393 PERL_UNUSED_CONTEXT; 394 395 assert(flags <= 1); 396 397 if (sv) { 398 MAGIC *mg; 399 400 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { 401 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) { 402 return mg; 403 } 404 } 405 } 406 407 return NULL; 408 } 409 410 /* 411 =for apidoc mg_find 412 413 Finds the magic pointer for type matching the SV. See C<sv_magic>. 414 415 =cut 416 */ 417 418 MAGIC* 419 Perl_mg_find(pTHX_ const SV *sv, int type) 420 { 421 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0); 422 } 423 424 /* 425 =for apidoc mg_findext 426 427 Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See 428 C<sv_magicext>. 429 430 =cut 431 */ 432 433 MAGIC* 434 Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl) 435 { 436 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1); 437 } 438 439 /* 440 =for apidoc mg_copy 441 442 Copies the magic from one SV to another. See C<sv_magic>. 443 444 =cut 445 */ 446 447 int 448 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen) 449 { 450 int count = 0; 451 MAGIC* mg; 452 453 PERL_ARGS_ASSERT_MG_COPY; 454 455 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { 456 const MGVTBL* const vtbl = mg->mg_virtual; 457 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){ 458 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen); 459 } 460 else { 461 const char type = mg->mg_type; 462 if (isUPPER(type) && type != PERL_MAGIC_uvar) { 463 sv_magic(nsv, 464 (type == PERL_MAGIC_tied) 465 ? SvTIED_obj(sv, mg) 466 : (type == PERL_MAGIC_regdata && mg->mg_obj) 467 ? sv 468 : mg->mg_obj, 469 toLOWER(type), key, klen); 470 count++; 471 } 472 } 473 } 474 return count; 475 } 476 477 /* 478 =for apidoc mg_localize 479 480 Copy some of the magic from an existing SV to new localized version of that 481 SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg 482 taint, pos). 483 484 If setmagic is false then no set magic will be called on the new (empty) SV. 485 This typically means that assignment will soon follow (e.g. 'local $x = $y'), 486 and that will handle the magic. 487 488 =cut 489 */ 490 491 void 492 Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic) 493 { 494 dVAR; 495 MAGIC *mg; 496 497 PERL_ARGS_ASSERT_MG_LOCALIZE; 498 499 if (nsv == DEFSV) 500 return; 501 502 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) { 503 const MGVTBL* const vtbl = mg->mg_virtual; 504 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type)) 505 continue; 506 507 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local) 508 (void)vtbl->svt_local(aTHX_ nsv, mg); 509 else 510 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl, 511 mg->mg_ptr, mg->mg_len); 512 513 /* container types should remain read-only across localization */ 514 if (!SvIsCOW(sv)) SvFLAGS(nsv) |= SvREADONLY(sv); 515 } 516 517 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) { 518 SvFLAGS(nsv) |= SvMAGICAL(sv); 519 if (setmagic) { 520 PL_localizing = 1; 521 SvSETMAGIC(nsv); 522 PL_localizing = 0; 523 } 524 } 525 } 526 527 #define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg) 528 static void 529 S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg) 530 { 531 const MGVTBL* const vtbl = mg->mg_virtual; 532 if (vtbl && vtbl->svt_free) 533 vtbl->svt_free(aTHX_ sv, mg); 534 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) { 535 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8) 536 Safefree(mg->mg_ptr); 537 else if (mg->mg_len == HEf_SVKEY) 538 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr)); 539 } 540 if (mg->mg_flags & MGf_REFCOUNTED) 541 SvREFCNT_dec(mg->mg_obj); 542 Safefree(mg); 543 } 544 545 /* 546 =for apidoc mg_free 547 548 Free any magic storage used by the SV. See C<sv_magic>. 549 550 =cut 551 */ 552 553 int 554 Perl_mg_free(pTHX_ SV *sv) 555 { 556 MAGIC* mg; 557 MAGIC* moremagic; 558 559 PERL_ARGS_ASSERT_MG_FREE; 560 561 for (mg = SvMAGIC(sv); mg; mg = moremagic) { 562 moremagic = mg->mg_moremagic; 563 mg_free_struct(sv, mg); 564 SvMAGIC_set(sv, moremagic); 565 } 566 SvMAGIC_set(sv, NULL); 567 SvMAGICAL_off(sv); 568 return 0; 569 } 570 571 /* 572 =for apidoc Am|void|mg_free_type|SV *sv|int how 573 574 Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>. 575 576 =cut 577 */ 578 579 void 580 Perl_mg_free_type(pTHX_ SV *sv, int how) 581 { 582 MAGIC *mg, *prevmg, *moremg; 583 PERL_ARGS_ASSERT_MG_FREE_TYPE; 584 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) { 585 MAGIC *newhead; 586 moremg = mg->mg_moremagic; 587 if (mg->mg_type == how) { 588 /* temporarily move to the head of the magic chain, in case 589 custom free code relies on this historical aspect of mg_free */ 590 if (prevmg) { 591 prevmg->mg_moremagic = moremg; 592 mg->mg_moremagic = SvMAGIC(sv); 593 SvMAGIC_set(sv, mg); 594 } 595 newhead = mg->mg_moremagic; 596 mg_free_struct(sv, mg); 597 SvMAGIC_set(sv, newhead); 598 mg = prevmg; 599 } 600 } 601 mg_magical(sv); 602 } 603 604 #include <signal.h> 605 606 U32 607 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg) 608 { 609 dVAR; 610 PERL_UNUSED_ARG(sv); 611 612 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT; 613 614 if (PL_curpm) { 615 const REGEXP * const rx = PM_GETRE(PL_curpm); 616 if (rx) { 617 if (mg->mg_obj) { /* @+ */ 618 /* return the number possible */ 619 return RX_NPARENS(rx); 620 } else { /* @- */ 621 I32 paren = RX_LASTPAREN(rx); 622 623 /* return the last filled */ 624 while ( paren >= 0 625 && (RX_OFFS(rx)[paren].start == -1 626 || RX_OFFS(rx)[paren].end == -1) ) 627 paren--; 628 return (U32)paren; 629 } 630 } 631 } 632 633 return (U32)-1; 634 } 635 636 /* @-, @+ */ 637 638 int 639 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg) 640 { 641 dVAR; 642 643 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET; 644 645 if (PL_curpm) { 646 const REGEXP * const rx = PM_GETRE(PL_curpm); 647 if (rx) { 648 const I32 paren = mg->mg_len; 649 I32 s; 650 I32 t; 651 if (paren < 0) 652 return 0; 653 if (paren <= (I32)RX_NPARENS(rx) && 654 (s = RX_OFFS(rx)[paren].start) != -1 && 655 (t = RX_OFFS(rx)[paren].end) != -1) 656 { 657 I32 i; 658 if (mg->mg_obj) /* @+ */ 659 i = t; 660 else /* @- */ 661 i = s; 662 663 if (i > 0 && RX_MATCH_UTF8(rx)) { 664 const char * const b = RX_SUBBEG(rx); 665 if (b) 666 i = RX_SUBCOFFSET(rx) + 667 utf8_length((U8*)b, 668 (U8*)(b-RX_SUBOFFSET(rx)+i)); 669 } 670 671 sv_setiv(sv, i); 672 } 673 } 674 } 675 return 0; 676 } 677 678 /* @-, @+ */ 679 680 int 681 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg) 682 { 683 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET; 684 PERL_UNUSED_ARG(sv); 685 PERL_UNUSED_ARG(mg); 686 Perl_croak_no_modify(); 687 NORETURN_FUNCTION_END; 688 } 689 690 #define SvRTRIM(sv) STMT_START { \ 691 if (SvPOK(sv)) { \ 692 STRLEN len = SvCUR(sv); \ 693 char * const p = SvPVX(sv); \ 694 while (len > 0 && isSPACE(p[len-1])) \ 695 --len; \ 696 SvCUR_set(sv, len); \ 697 p[len] = '\0'; \ 698 } \ 699 } STMT_END 700 701 void 702 Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv) 703 { 704 PERL_ARGS_ASSERT_EMULATE_COP_IO; 705 706 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT))) 707 sv_setsv(sv, &PL_sv_undef); 708 else { 709 sv_setpvs(sv, ""); 710 SvUTF8_off(sv); 711 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) { 712 SV *const value = cop_hints_fetch_pvs(c, "open<", 0); 713 assert(value); 714 sv_catsv(sv, value); 715 } 716 sv_catpvs(sv, "\0"); 717 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) { 718 SV *const value = cop_hints_fetch_pvs(c, "open>", 0); 719 assert(value); 720 sv_catsv(sv, value); 721 } 722 } 723 } 724 725 #ifdef VMS 726 #include <descrip.h> 727 #include <starlet.h> 728 #endif 729 730 int 731 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg) 732 { 733 dVAR; 734 I32 paren; 735 const char *s = NULL; 736 REGEXP *rx; 737 const char * const remaining = mg->mg_ptr + 1; 738 const char nextchar = *remaining; 739 740 PERL_ARGS_ASSERT_MAGIC_GET; 741 742 switch (*mg->mg_ptr) { 743 case '\001': /* ^A */ 744 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget); 745 else sv_setsv(sv, &PL_sv_undef); 746 if (SvTAINTED(PL_bodytarget)) 747 SvTAINTED_on(sv); 748 break; 749 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */ 750 if (nextchar == '\0') { 751 sv_setiv(sv, (IV)PL_minus_c); 752 } 753 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) { 754 sv_setiv(sv, (IV)STATUS_NATIVE); 755 } 756 break; 757 758 case '\004': /* ^D */ 759 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK)); 760 break; 761 case '\005': /* ^E */ 762 if (nextchar == '\0') { 763 #if defined(VMS) 764 { 765 char msg[255]; 766 $DESCRIPTOR(msgdsc,msg); 767 sv_setnv(sv,(NV) vaxc$errno); 768 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1) 769 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length); 770 else 771 sv_setpvs(sv,""); 772 } 773 #elif defined(OS2) 774 if (!(_emx_env & 0x200)) { /* Under DOS */ 775 sv_setnv(sv, (NV)errno); 776 sv_setpv(sv, errno ? Strerror(errno) : ""); 777 } else { 778 if (errno != errno_isOS2) { 779 const int tmp = _syserrno(); 780 if (tmp) /* 2nd call to _syserrno() makes it 0 */ 781 Perl_rc = tmp; 782 } 783 sv_setnv(sv, (NV)Perl_rc); 784 sv_setpv(sv, os2error(Perl_rc)); 785 } 786 #elif defined(WIN32) 787 { 788 const DWORD dwErr = GetLastError(); 789 sv_setnv(sv, (NV)dwErr); 790 if (dwErr) { 791 PerlProc_GetOSError(sv, dwErr); 792 } 793 else 794 sv_setpvs(sv, ""); 795 SetLastError(dwErr); 796 } 797 #else 798 { 799 dSAVE_ERRNO; 800 sv_setnv(sv, (NV)errno); 801 sv_setpv(sv, errno ? Strerror(errno) : ""); 802 RESTORE_ERRNO; 803 } 804 #endif 805 SvRTRIM(sv); 806 SvNOK_on(sv); /* what a wonderful hack! */ 807 } 808 else if (strEQ(remaining, "NCODING")) 809 sv_setsv(sv, PL_encoding); 810 break; 811 case '\006': /* ^F */ 812 sv_setiv(sv, (IV)PL_maxsysfd); 813 break; 814 case '\007': /* ^GLOBAL_PHASE */ 815 if (strEQ(remaining, "LOBAL_PHASE")) { 816 sv_setpvn(sv, PL_phase_names[PL_phase], 817 strlen(PL_phase_names[PL_phase])); 818 } 819 break; 820 case '\010': /* ^H */ 821 sv_setiv(sv, (IV)PL_hints); 822 break; 823 case '\011': /* ^I */ /* NOT \t in EBCDIC */ 824 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */ 825 break; 826 case '\014': /* ^LAST_FH */ 827 if (strEQ(remaining, "AST_FH")) { 828 if (PL_last_in_gv) { 829 assert(isGV_with_GP(PL_last_in_gv)); 830 SV_CHECK_THINKFIRST_COW_DROP(sv); 831 prepare_SV_for_RV(sv); 832 SvOK_off(sv); 833 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv)); 834 SvROK_on(sv); 835 sv_rvweaken(sv); 836 } 837 else sv_setsv_nomg(sv, NULL); 838 } 839 break; 840 case '\017': /* ^O & ^OPEN */ 841 if (nextchar == '\0') { 842 sv_setpv(sv, PL_osname); 843 SvTAINTED_off(sv); 844 } 845 else if (strEQ(remaining, "PEN")) { 846 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv); 847 } 848 break; 849 case '\020': 850 if (nextchar == '\0') { /* ^P */ 851 sv_setiv(sv, (IV)PL_perldb); 852 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */ 853 854 paren = RX_BUFF_IDX_CARET_PREMATCH; 855 goto do_numbuf_fetch; 856 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */ 857 paren = RX_BUFF_IDX_CARET_POSTMATCH; 858 goto do_numbuf_fetch; 859 } 860 break; 861 case '\023': /* ^S */ 862 if (nextchar == '\0') { 863 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING) 864 SvOK_off(sv); 865 else if (PL_in_eval) 866 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE)); 867 else 868 sv_setiv(sv, 0); 869 } 870 break; 871 case '\024': /* ^T */ 872 if (nextchar == '\0') { 873 #ifdef BIG_TIME 874 sv_setnv(sv, PL_basetime); 875 #else 876 sv_setiv(sv, (IV)PL_basetime); 877 #endif 878 } 879 else if (strEQ(remaining, "AINT")) 880 sv_setiv(sv, TAINTING_get 881 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1) 882 : 0); 883 break; 884 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */ 885 if (strEQ(remaining, "NICODE")) 886 sv_setuv(sv, (UV) PL_unicode); 887 else if (strEQ(remaining, "TF8LOCALE")) 888 sv_setuv(sv, (UV) PL_utf8locale); 889 else if (strEQ(remaining, "TF8CACHE")) 890 sv_setiv(sv, (IV) PL_utf8cache); 891 break; 892 case '\027': /* ^W & $^WARNING_BITS */ 893 if (nextchar == '\0') 894 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE)); 895 else if (strEQ(remaining, "ARNING_BITS")) { 896 if (PL_compiling.cop_warnings == pWARN_NONE) { 897 sv_setpvn(sv, WARN_NONEstring, WARNsize) ; 898 } 899 else if (PL_compiling.cop_warnings == pWARN_STD) { 900 sv_setsv(sv, &PL_sv_undef); 901 break; 902 } 903 else if (PL_compiling.cop_warnings == pWARN_ALL) { 904 /* Get the bit mask for $warnings::Bits{all}, because 905 * it could have been extended by warnings::register */ 906 HV * const bits = get_hv("warnings::Bits", 0); 907 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL; 908 if (bits_all) 909 sv_copypv(sv, *bits_all); 910 else 911 sv_setpvn(sv, WARN_ALLstring, WARNsize); 912 } 913 else { 914 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1), 915 *PL_compiling.cop_warnings); 916 } 917 } 918 break; 919 case '\015': /* $^MATCH */ 920 if (strEQ(remaining, "ATCH")) { 921 paren = RX_BUFF_IDX_CARET_FULLMATCH; 922 goto do_numbuf_fetch; 923 } 924 925 case '1': case '2': case '3': case '4': 926 case '5': case '6': case '7': case '8': case '9': case '&': 927 /* 928 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj)); 929 * XXX Does the new way break anything? 930 */ 931 paren = atoi(mg->mg_ptr); /* $& is in [0] */ 932 do_numbuf_fetch: 933 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) { 934 CALLREG_NUMBUF_FETCH(rx,paren,sv); 935 break; 936 } 937 sv_setsv(sv,&PL_sv_undef); 938 break; 939 case '+': 940 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) { 941 paren = RX_LASTPAREN(rx); 942 if (paren) 943 goto do_numbuf_fetch; 944 } 945 sv_setsv(sv,&PL_sv_undef); 946 break; 947 case '\016': /* ^N */ 948 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) { 949 paren = RX_LASTCLOSEPAREN(rx); 950 if (paren) 951 goto do_numbuf_fetch; 952 } 953 sv_setsv(sv,&PL_sv_undef); 954 break; 955 case '`': 956 paren = RX_BUFF_IDX_PREMATCH; 957 goto do_numbuf_fetch; 958 case '\'': 959 paren = RX_BUFF_IDX_POSTMATCH; 960 goto do_numbuf_fetch; 961 case '.': 962 if (GvIO(PL_last_in_gv)) { 963 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv))); 964 } 965 break; 966 case '?': 967 { 968 sv_setiv(sv, (IV)STATUS_CURRENT); 969 #ifdef COMPLEX_STATUS 970 SvUPGRADE(sv, SVt_PVLV); 971 LvTARGOFF(sv) = PL_statusvalue; 972 LvTARGLEN(sv) = PL_statusvalue_vms; 973 #endif 974 } 975 break; 976 case '^': 977 if (GvIOp(PL_defoutgv)) 978 s = IoTOP_NAME(GvIOp(PL_defoutgv)); 979 if (s) 980 sv_setpv(sv,s); 981 else { 982 sv_setpv(sv,GvENAME(PL_defoutgv)); 983 sv_catpvs(sv,"_TOP"); 984 } 985 break; 986 case '~': 987 if (GvIOp(PL_defoutgv)) 988 s = IoFMT_NAME(GvIOp(PL_defoutgv)); 989 if (!s) 990 s = GvENAME(PL_defoutgv); 991 sv_setpv(sv,s); 992 break; 993 case '=': 994 if (GvIO(PL_defoutgv)) 995 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv))); 996 break; 997 case '-': 998 if (GvIO(PL_defoutgv)) 999 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv))); 1000 break; 1001 case '%': 1002 if (GvIO(PL_defoutgv)) 1003 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv))); 1004 break; 1005 case ':': 1006 break; 1007 case '/': 1008 break; 1009 case '[': 1010 sv_setiv(sv, 0); 1011 break; 1012 case '|': 1013 if (GvIO(PL_defoutgv)) 1014 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 ); 1015 break; 1016 case '\\': 1017 if (PL_ors_sv) 1018 sv_copypv(sv, PL_ors_sv); 1019 else 1020 sv_setsv(sv, &PL_sv_undef); 1021 break; 1022 case '$': /* $$ */ 1023 { 1024 IV const pid = (IV)PerlProc_getpid(); 1025 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) { 1026 /* never set manually, or at least not since last fork */ 1027 sv_setiv(sv, pid); 1028 /* never unsafe, even if reading in a tainted expression */ 1029 SvTAINTED_off(sv); 1030 } 1031 /* else a value has been assigned manually, so do nothing */ 1032 } 1033 break; 1034 1035 case '!': 1036 { 1037 dSAVE_ERRNO; 1038 #ifdef VMS 1039 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno)); 1040 #else 1041 sv_setnv(sv, (NV)errno); 1042 #endif 1043 #ifdef OS2 1044 if (errno == errno_isOS2 || errno == errno_isOS2_set) 1045 sv_setpv(sv, os2error(Perl_rc)); 1046 else 1047 #endif 1048 sv_setpv(sv, errno ? Strerror(errno) : ""); 1049 RESTORE_ERRNO; 1050 } 1051 1052 SvRTRIM(sv); 1053 SvNOK_on(sv); /* what a wonderful hack! */ 1054 break; 1055 case '<': 1056 sv_setiv(sv, (IV)PerlProc_getuid()); 1057 break; 1058 case '>': 1059 sv_setiv(sv, (IV)PerlProc_geteuid()); 1060 break; 1061 case '(': 1062 sv_setiv(sv, (IV)PerlProc_getgid()); 1063 goto add_groups; 1064 case ')': 1065 sv_setiv(sv, (IV)PerlProc_getegid()); 1066 add_groups: 1067 #ifdef HAS_GETGROUPS 1068 { 1069 Groups_t *gary = NULL; 1070 I32 i, num_groups = getgroups(0, gary); 1071 Newx(gary, num_groups, Groups_t); 1072 num_groups = getgroups(num_groups, gary); 1073 for (i = 0; i < num_groups; i++) 1074 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]); 1075 Safefree(gary); 1076 } 1077 (void)SvIOK_on(sv); /* what a wonderful hack! */ 1078 #endif 1079 break; 1080 case '0': 1081 break; 1082 } 1083 return 0; 1084 } 1085 1086 int 1087 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg) 1088 { 1089 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr; 1090 1091 PERL_ARGS_ASSERT_MAGIC_GETUVAR; 1092 1093 if (uf && uf->uf_val) 1094 (*uf->uf_val)(aTHX_ uf->uf_index, sv); 1095 return 0; 1096 } 1097 1098 int 1099 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg) 1100 { 1101 dVAR; 1102 STRLEN len = 0, klen; 1103 const char * const key = MgPV_const(mg,klen); 1104 const char *s = ""; 1105 1106 PERL_ARGS_ASSERT_MAGIC_SETENV; 1107 1108 SvGETMAGIC(sv); 1109 if (SvOK(sv)) { 1110 /* defined environment variables are byte strings; unfortunately 1111 there is no SvPVbyte_force_nomg(), so we must do this piecewise */ 1112 (void)SvPV_force_nomg_nolen(sv); 1113 sv_utf8_downgrade(sv, /* fail_ok */ TRUE); 1114 if (SvUTF8(sv)) { 1115 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv"); 1116 SvUTF8_off(sv); 1117 } 1118 s = SvPVX(sv); 1119 len = SvCUR(sv); 1120 } 1121 my_setenv(key, s); /* does the deed */ 1122 1123 #ifdef DYNAMIC_ENV_FETCH 1124 /* We just undefd an environment var. Is a replacement */ 1125 /* waiting in the wings? */ 1126 if (!len) { 1127 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE); 1128 if (valp) 1129 s = SvOK(*valp) ? SvPV_const(*valp, len) : ""; 1130 } 1131 #endif 1132 1133 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS) 1134 /* And you'll never guess what the dog had */ 1135 /* in its mouth... */ 1136 if (TAINTING_get) { 1137 MgTAINTEDDIR_off(mg); 1138 #ifdef VMS 1139 if (s && klen == 8 && strEQ(key, "DCL$PATH")) { 1140 char pathbuf[256], eltbuf[256], *cp, *elt; 1141 int i = 0, j = 0; 1142 1143 my_strlcpy(eltbuf, s, sizeof(eltbuf)); 1144 elt = eltbuf; 1145 do { /* DCL$PATH may be a search list */ 1146 while (1) { /* as may dev portion of any element */ 1147 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) { 1148 if ( *(cp+1) == '.' || *(cp+1) == '-' || 1149 cando_by_name(S_IWUSR,0,elt) ) { 1150 MgTAINTEDDIR_on(mg); 1151 return 0; 1152 } 1153 } 1154 if ((cp = strchr(elt, ':')) != NULL) 1155 *cp = '\0'; 1156 if (my_trnlnm(elt, eltbuf, j++)) 1157 elt = eltbuf; 1158 else 1159 break; 1160 } 1161 j = 0; 1162 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf)); 1163 } 1164 #endif /* VMS */ 1165 if (s && klen == 4 && strEQ(key,"PATH")) { 1166 const char * const strend = s + len; 1167 1168 while (s < strend) { 1169 char tmpbuf[256]; 1170 Stat_t st; 1171 I32 i; 1172 #ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */ 1173 const char path_sep = '|'; 1174 #else 1175 const char path_sep = ':'; 1176 #endif 1177 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf, 1178 s, strend, path_sep, &i); 1179 s++; 1180 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */ 1181 #ifdef VMS 1182 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */ 1183 #else 1184 || *tmpbuf != '/' /* no starting slash -- assume relative path */ 1185 #endif 1186 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) { 1187 MgTAINTEDDIR_on(mg); 1188 return 0; 1189 } 1190 } 1191 } 1192 } 1193 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */ 1194 1195 return 0; 1196 } 1197 1198 int 1199 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg) 1200 { 1201 PERL_ARGS_ASSERT_MAGIC_CLEARENV; 1202 PERL_UNUSED_ARG(sv); 1203 my_setenv(MgPV_nolen_const(mg),NULL); 1204 return 0; 1205 } 1206 1207 int 1208 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg) 1209 { 1210 dVAR; 1211 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV; 1212 PERL_UNUSED_ARG(mg); 1213 #if defined(VMS) 1214 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system"); 1215 #else 1216 if (PL_localizing) { 1217 HE* entry; 1218 my_clearenv(); 1219 hv_iterinit(MUTABLE_HV(sv)); 1220 while ((entry = hv_iternext(MUTABLE_HV(sv)))) { 1221 I32 keylen; 1222 my_setenv(hv_iterkey(entry, &keylen), 1223 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry))); 1224 } 1225 } 1226 #endif 1227 return 0; 1228 } 1229 1230 int 1231 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg) 1232 { 1233 dVAR; 1234 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV; 1235 PERL_UNUSED_ARG(sv); 1236 PERL_UNUSED_ARG(mg); 1237 #if defined(VMS) 1238 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system"); 1239 #else 1240 my_clearenv(); 1241 #endif 1242 return 0; 1243 } 1244 1245 #ifndef PERL_MICRO 1246 #ifdef HAS_SIGPROCMASK 1247 static void 1248 restore_sigmask(pTHX_ SV *save_sv) 1249 { 1250 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv ); 1251 (void)sigprocmask(SIG_SETMASK, ossetp, NULL); 1252 } 1253 #endif 1254 int 1255 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg) 1256 { 1257 dVAR; 1258 /* Are we fetching a signal entry? */ 1259 int i = (I16)mg->mg_private; 1260 1261 PERL_ARGS_ASSERT_MAGIC_GETSIG; 1262 1263 if (!i) { 1264 STRLEN siglen; 1265 const char * sig = MgPV_const(mg, siglen); 1266 mg->mg_private = i = whichsig_pvn(sig, siglen); 1267 } 1268 1269 if (i > 0) { 1270 if(PL_psig_ptr[i]) 1271 sv_setsv(sv,PL_psig_ptr[i]); 1272 else { 1273 Sighandler_t sigstate = rsignal_state(i); 1274 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS 1275 if (PL_sig_handlers_initted && PL_sig_ignoring[i]) 1276 sigstate = SIG_IGN; 1277 #endif 1278 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS 1279 if (PL_sig_handlers_initted && PL_sig_defaulting[i]) 1280 sigstate = SIG_DFL; 1281 #endif 1282 /* cache state so we don't fetch it again */ 1283 if(sigstate == (Sighandler_t) SIG_IGN) 1284 sv_setpvs(sv,"IGNORE"); 1285 else 1286 sv_setsv(sv,&PL_sv_undef); 1287 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv); 1288 SvTEMP_off(sv); 1289 } 1290 } 1291 return 0; 1292 } 1293 int 1294 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg) 1295 { 1296 PERL_ARGS_ASSERT_MAGIC_CLEARSIG; 1297 1298 magic_setsig(NULL, mg); 1299 return sv_unmagic(sv, mg->mg_type); 1300 } 1301 1302 Signal_t 1303 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO) 1304 Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL) 1305 #else 1306 Perl_csighandler(int sig) 1307 #endif 1308 { 1309 #ifdef PERL_GET_SIG_CONTEXT 1310 dTHXa(PERL_GET_SIG_CONTEXT); 1311 #else 1312 dTHX; 1313 #endif 1314 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS 1315 (void) rsignal(sig, PL_csighandlerp); 1316 if (PL_sig_ignoring[sig]) return; 1317 #endif 1318 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS 1319 if (PL_sig_defaulting[sig]) 1320 #ifdef KILL_BY_SIGPRC 1321 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG); 1322 #else 1323 exit(1); 1324 #endif 1325 #endif 1326 if ( 1327 #ifdef SIGILL 1328 sig == SIGILL || 1329 #endif 1330 #ifdef SIGBUS 1331 sig == SIGBUS || 1332 #endif 1333 #ifdef SIGSEGV 1334 sig == SIGSEGV || 1335 #endif 1336 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG)) 1337 /* Call the perl level handler now-- 1338 * with risk we may be in malloc() or being destructed etc. */ 1339 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO) 1340 (*PL_sighandlerp)(sig, NULL, NULL); 1341 #else 1342 (*PL_sighandlerp)(sig); 1343 #endif 1344 else { 1345 if (!PL_psig_pend) return; 1346 /* Set a flag to say this signal is pending, that is awaiting delivery after 1347 * the current Perl opcode completes */ 1348 PL_psig_pend[sig]++; 1349 1350 #ifndef SIG_PENDING_DIE_COUNT 1351 # define SIG_PENDING_DIE_COUNT 120 1352 #endif 1353 /* Add one to say _a_ signal is pending */ 1354 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT) 1355 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded", 1356 (unsigned long)SIG_PENDING_DIE_COUNT); 1357 } 1358 } 1359 1360 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS) 1361 void 1362 Perl_csighandler_init(void) 1363 { 1364 int sig; 1365 if (PL_sig_handlers_initted) return; 1366 1367 for (sig = 1; sig < SIG_SIZE; sig++) { 1368 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS 1369 dTHX; 1370 PL_sig_defaulting[sig] = 1; 1371 (void) rsignal(sig, PL_csighandlerp); 1372 #endif 1373 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS 1374 PL_sig_ignoring[sig] = 0; 1375 #endif 1376 } 1377 PL_sig_handlers_initted = 1; 1378 } 1379 #endif 1380 1381 #if defined HAS_SIGPROCMASK 1382 static void 1383 unblock_sigmask(pTHX_ void* newset) 1384 { 1385 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL); 1386 } 1387 #endif 1388 1389 void 1390 Perl_despatch_signals(pTHX) 1391 { 1392 dVAR; 1393 int sig; 1394 PL_sig_pending = 0; 1395 for (sig = 1; sig < SIG_SIZE; sig++) { 1396 if (PL_psig_pend[sig]) { 1397 dSAVE_ERRNO; 1398 #ifdef HAS_SIGPROCMASK 1399 /* From sigaction(2) (FreeBSD man page): 1400 * | Signal routines normally execute with the signal that 1401 * | caused their invocation blocked, but other signals may 1402 * | yet occur. 1403 * Emulation of this behavior (from within Perl) is enabled 1404 * using sigprocmask 1405 */ 1406 int was_blocked; 1407 sigset_t newset, oldset; 1408 1409 sigemptyset(&newset); 1410 sigaddset(&newset, sig); 1411 sigprocmask(SIG_BLOCK, &newset, &oldset); 1412 was_blocked = sigismember(&oldset, sig); 1413 if (!was_blocked) { 1414 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t)); 1415 ENTER; 1416 SAVEFREESV(save_sv); 1417 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv)); 1418 } 1419 #endif 1420 PL_psig_pend[sig] = 0; 1421 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO) 1422 (*PL_sighandlerp)(sig, NULL, NULL); 1423 #else 1424 (*PL_sighandlerp)(sig); 1425 #endif 1426 #ifdef HAS_SIGPROCMASK 1427 if (!was_blocked) 1428 LEAVE; 1429 #endif 1430 RESTORE_ERRNO; 1431 } 1432 } 1433 } 1434 1435 /* sv of NULL signifies that we're acting as magic_clearsig. */ 1436 int 1437 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg) 1438 { 1439 dVAR; 1440 I32 i; 1441 SV** svp = NULL; 1442 /* Need to be careful with SvREFCNT_dec(), because that can have side 1443 * effects (due to closures). We must make sure that the new disposition 1444 * is in place before it is called. 1445 */ 1446 SV* to_dec = NULL; 1447 STRLEN len; 1448 #ifdef HAS_SIGPROCMASK 1449 sigset_t set, save; 1450 SV* save_sv; 1451 #endif 1452 const char *s = MgPV_const(mg,len); 1453 1454 PERL_ARGS_ASSERT_MAGIC_SETSIG; 1455 1456 if (*s == '_') { 1457 if (memEQs(s, len, "__DIE__")) 1458 svp = &PL_diehook; 1459 else if (memEQs(s, len, "__WARN__") 1460 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) { 1461 /* Merge the existing behaviours, which are as follows: 1462 magic_setsig, we always set svp to &PL_warnhook 1463 (hence we always change the warnings handler) 1464 For magic_clearsig, we don't change the warnings handler if it's 1465 set to the &PL_warnhook. */ 1466 svp = &PL_warnhook; 1467 } else if (sv) { 1468 SV *tmp = sv_newmortal(); 1469 Perl_croak(aTHX_ "No such hook: %s", 1470 pv_pretty(tmp, s, len, 0, NULL, NULL, 0)); 1471 } 1472 i = 0; 1473 if (svp && *svp) { 1474 if (*svp != PERL_WARNHOOK_FATAL) 1475 to_dec = *svp; 1476 *svp = NULL; 1477 } 1478 } 1479 else { 1480 i = (I16)mg->mg_private; 1481 if (!i) { 1482 i = whichsig_pvn(s, len); /* ...no, a brick */ 1483 mg->mg_private = (U16)i; 1484 } 1485 if (i <= 0) { 1486 if (sv) { 1487 SV *tmp = sv_newmortal(); 1488 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", 1489 pv_pretty(tmp, s, len, 0, NULL, NULL, 0)); 1490 } 1491 return 0; 1492 } 1493 #ifdef HAS_SIGPROCMASK 1494 /* Avoid having the signal arrive at a bad time, if possible. */ 1495 sigemptyset(&set); 1496 sigaddset(&set,i); 1497 sigprocmask(SIG_BLOCK, &set, &save); 1498 ENTER; 1499 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t)); 1500 SAVEFREESV(save_sv); 1501 SAVEDESTRUCTOR_X(restore_sigmask, save_sv); 1502 #endif 1503 PERL_ASYNC_CHECK(); 1504 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS) 1505 if (!PL_sig_handlers_initted) Perl_csighandler_init(); 1506 #endif 1507 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS 1508 PL_sig_ignoring[i] = 0; 1509 #endif 1510 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS 1511 PL_sig_defaulting[i] = 0; 1512 #endif 1513 to_dec = PL_psig_ptr[i]; 1514 if (sv) { 1515 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv); 1516 SvTEMP_off(sv); /* Make sure it doesn't go away on us */ 1517 1518 /* Signals don't change name during the program's execution, so once 1519 they're cached in the appropriate slot of PL_psig_name, they can 1520 stay there. 1521 1522 Ideally we'd find some way of making SVs at (C) compile time, or 1523 at least, doing most of the work. */ 1524 if (!PL_psig_name[i]) { 1525 PL_psig_name[i] = newSVpvn(s, len); 1526 SvREADONLY_on(PL_psig_name[i]); 1527 } 1528 } else { 1529 SvREFCNT_dec(PL_psig_name[i]); 1530 PL_psig_name[i] = NULL; 1531 PL_psig_ptr[i] = NULL; 1532 } 1533 } 1534 if (sv && (isGV_with_GP(sv) || SvROK(sv))) { 1535 if (i) { 1536 (void)rsignal(i, PL_csighandlerp); 1537 } 1538 else 1539 *svp = SvREFCNT_inc_simple_NN(sv); 1540 } else { 1541 if (sv && SvOK(sv)) { 1542 s = SvPV_force(sv, len); 1543 } else { 1544 sv = NULL; 1545 } 1546 if (sv && memEQs(s, len,"IGNORE")) { 1547 if (i) { 1548 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS 1549 PL_sig_ignoring[i] = 1; 1550 (void)rsignal(i, PL_csighandlerp); 1551 #else 1552 (void)rsignal(i, (Sighandler_t) SIG_IGN); 1553 #endif 1554 } 1555 } 1556 else if (!sv || memEQs(s, len,"DEFAULT") || !len) { 1557 if (i) { 1558 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS 1559 PL_sig_defaulting[i] = 1; 1560 (void)rsignal(i, PL_csighandlerp); 1561 #else 1562 (void)rsignal(i, (Sighandler_t) SIG_DFL); 1563 #endif 1564 } 1565 } 1566 else { 1567 /* 1568 * We should warn if HINT_STRICT_REFS, but without 1569 * access to a known hint bit in a known OP, we can't 1570 * tell whether HINT_STRICT_REFS is in force or not. 1571 */ 1572 if (!strchr(s,':') && !strchr(s,'\'')) 1573 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"), 1574 SV_GMAGIC); 1575 if (i) 1576 (void)rsignal(i, PL_csighandlerp); 1577 else 1578 *svp = SvREFCNT_inc_simple_NN(sv); 1579 } 1580 } 1581 1582 #ifdef HAS_SIGPROCMASK 1583 if(i) 1584 LEAVE; 1585 #endif 1586 SvREFCNT_dec(to_dec); 1587 return 0; 1588 } 1589 #endif /* !PERL_MICRO */ 1590 1591 int 1592 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg) 1593 { 1594 dVAR; 1595 PERL_ARGS_ASSERT_MAGIC_SETISA; 1596 PERL_UNUSED_ARG(sv); 1597 1598 /* Skip _isaelem because _isa will handle it shortly */ 1599 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem) 1600 return 0; 1601 1602 return magic_clearisa(NULL, mg); 1603 } 1604 1605 /* sv of NULL signifies that we're acting as magic_setisa. */ 1606 int 1607 Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg) 1608 { 1609 dVAR; 1610 HV* stash; 1611 1612 PERL_ARGS_ASSERT_MAGIC_CLEARISA; 1613 1614 /* Bail out if destruction is going on */ 1615 if(PL_phase == PERL_PHASE_DESTRUCT) return 0; 1616 1617 if (sv) 1618 av_clear(MUTABLE_AV(sv)); 1619 1620 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj)) 1621 /* This occurs with setisa_elem magic, which calls this 1622 same function. */ 1623 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa); 1624 1625 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */ 1626 SV **svp = AvARRAY((AV *)mg->mg_obj); 1627 I32 items = AvFILLp((AV *)mg->mg_obj) + 1; 1628 while (items--) { 1629 stash = GvSTASH((GV *)*svp++); 1630 if (stash && HvENAME(stash)) mro_isa_changed_in(stash); 1631 } 1632 1633 return 0; 1634 } 1635 1636 stash = GvSTASH( 1637 (const GV *)mg->mg_obj 1638 ); 1639 1640 /* The stash may have been detached from the symbol table, so check its 1641 name before doing anything. */ 1642 if (stash && HvENAME_get(stash)) 1643 mro_isa_changed_in(stash); 1644 1645 return 0; 1646 } 1647 1648 int 1649 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg) 1650 { 1651 HV * const hv = MUTABLE_HV(LvTARG(sv)); 1652 I32 i = 0; 1653 1654 PERL_ARGS_ASSERT_MAGIC_GETNKEYS; 1655 PERL_UNUSED_ARG(mg); 1656 1657 if (hv) { 1658 (void) hv_iterinit(hv); 1659 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied)) 1660 i = HvUSEDKEYS(hv); 1661 else { 1662 while (hv_iternext(hv)) 1663 i++; 1664 } 1665 } 1666 1667 sv_setiv(sv, (IV)i); 1668 return 0; 1669 } 1670 1671 int 1672 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg) 1673 { 1674 PERL_ARGS_ASSERT_MAGIC_SETNKEYS; 1675 PERL_UNUSED_ARG(mg); 1676 if (LvTARG(sv)) { 1677 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv)); 1678 } 1679 return 0; 1680 } 1681 1682 /* 1683 =for apidoc magic_methcall 1684 1685 Invoke a magic method (like FETCH). 1686 1687 C<sv> and C<mg> are the tied thingy and the tie magic. 1688 1689 C<meth> is the name of the method to call. 1690 1691 C<argc> is the number of args (in addition to $self) to pass to the method. 1692 1693 The C<flags> can be: 1694 1695 G_DISCARD invoke method with G_DISCARD flag and don't 1696 return a value 1697 G_UNDEF_FILL fill the stack with argc pointers to 1698 PL_sv_undef 1699 1700 The arguments themselves are any values following the C<flags> argument. 1701 1702 Returns the SV (if any) returned by the method, or NULL on failure. 1703 1704 1705 =cut 1706 */ 1707 1708 SV* 1709 Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags, 1710 U32 argc, ...) 1711 { 1712 dVAR; 1713 dSP; 1714 SV* ret = NULL; 1715 1716 PERL_ARGS_ASSERT_MAGIC_METHCALL; 1717 1718 ENTER; 1719 1720 if (flags & G_WRITING_TO_STDERR) { 1721 SAVETMPS; 1722 1723 save_re_context(); 1724 SAVESPTR(PL_stderrgv); 1725 PL_stderrgv = NULL; 1726 } 1727 1728 PUSHSTACKi(PERLSI_MAGIC); 1729 PUSHMARK(SP); 1730 1731 EXTEND(SP, argc+1); 1732 PUSHs(SvTIED_obj(sv, mg)); 1733 if (flags & G_UNDEF_FILL) { 1734 while (argc--) { 1735 PUSHs(&PL_sv_undef); 1736 } 1737 } else if (argc > 0) { 1738 va_list args; 1739 va_start(args, argc); 1740 1741 do { 1742 SV *const sv = va_arg(args, SV *); 1743 PUSHs(sv); 1744 } while (--argc); 1745 1746 va_end(args); 1747 } 1748 PUTBACK; 1749 if (flags & G_DISCARD) { 1750 call_method(meth, G_SCALAR|G_DISCARD); 1751 } 1752 else { 1753 if (call_method(meth, G_SCALAR)) 1754 ret = *PL_stack_sp--; 1755 } 1756 POPSTACK; 1757 if (flags & G_WRITING_TO_STDERR) 1758 FREETMPS; 1759 LEAVE; 1760 return ret; 1761 } 1762 1763 1764 /* wrapper for magic_methcall that creates the first arg */ 1765 1766 STATIC SV* 1767 S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags, 1768 int n, SV *val) 1769 { 1770 dVAR; 1771 SV* arg1 = NULL; 1772 1773 PERL_ARGS_ASSERT_MAGIC_METHCALL1; 1774 1775 if (mg->mg_ptr) { 1776 if (mg->mg_len >= 0) { 1777 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP); 1778 } 1779 else if (mg->mg_len == HEf_SVKEY) 1780 arg1 = MUTABLE_SV(mg->mg_ptr); 1781 } 1782 else if (mg->mg_type == PERL_MAGIC_tiedelem) { 1783 arg1 = newSViv((IV)(mg->mg_len)); 1784 sv_2mortal(arg1); 1785 } 1786 if (!arg1) { 1787 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val); 1788 } 1789 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val); 1790 } 1791 1792 STATIC int 1793 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth) 1794 { 1795 dVAR; 1796 SV* ret; 1797 1798 PERL_ARGS_ASSERT_MAGIC_METHPACK; 1799 1800 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL); 1801 if (ret) 1802 sv_setsv(sv, ret); 1803 return 0; 1804 } 1805 1806 int 1807 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg) 1808 { 1809 PERL_ARGS_ASSERT_MAGIC_GETPACK; 1810 1811 if (mg->mg_type == PERL_MAGIC_tiedelem) 1812 mg->mg_flags |= MGf_GSKIP; 1813 magic_methpack(sv,mg,"FETCH"); 1814 return 0; 1815 } 1816 1817 int 1818 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg) 1819 { 1820 dVAR; 1821 MAGIC *tmg; 1822 SV *val; 1823 1824 PERL_ARGS_ASSERT_MAGIC_SETPACK; 1825 1826 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to 1827 * STORE() is not $val, but rather a PVLV (the sv in this call), whose 1828 * public flags indicate its value based on copying from $val. Doing 1829 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us. 1830 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes 1831 * wrong if $val happened to be tainted, as sv hasn't got magic 1832 * enabled, even though taint magic is in the chain. In which case, 1833 * fake up a temporary tainted value (this is easier than temporarily 1834 * re-enabling magic on sv). */ 1835 1836 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint)) 1837 && (tmg->mg_len & 1)) 1838 { 1839 val = sv_mortalcopy(sv); 1840 SvTAINTED_on(val); 1841 } 1842 else 1843 val = sv; 1844 1845 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val); 1846 return 0; 1847 } 1848 1849 int 1850 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg) 1851 { 1852 PERL_ARGS_ASSERT_MAGIC_CLEARPACK; 1853 1854 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0; 1855 return magic_methpack(sv,mg,"DELETE"); 1856 } 1857 1858 1859 U32 1860 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg) 1861 { 1862 dVAR; 1863 I32 retval = 0; 1864 SV* retsv; 1865 1866 PERL_ARGS_ASSERT_MAGIC_SIZEPACK; 1867 1868 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL); 1869 if (retsv) { 1870 retval = SvIV(retsv)-1; 1871 if (retval < -1) 1872 Perl_croak(aTHX_ "FETCHSIZE returned a negative value"); 1873 } 1874 return (U32) retval; 1875 } 1876 1877 int 1878 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg) 1879 { 1880 dVAR; 1881 1882 PERL_ARGS_ASSERT_MAGIC_WIPEPACK; 1883 1884 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0); 1885 return 0; 1886 } 1887 1888 int 1889 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key) 1890 { 1891 dVAR; 1892 SV* ret; 1893 1894 PERL_ARGS_ASSERT_MAGIC_NEXTPACK; 1895 1896 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key) 1897 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0); 1898 if (ret) 1899 sv_setsv(key,ret); 1900 return 0; 1901 } 1902 1903 int 1904 Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg) 1905 { 1906 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK; 1907 1908 return magic_methpack(sv,mg,"EXISTS"); 1909 } 1910 1911 SV * 1912 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg) 1913 { 1914 dVAR; 1915 SV *retval; 1916 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg); 1917 HV * const pkg = SvSTASH((const SV *)SvRV(tied)); 1918 1919 PERL_ARGS_ASSERT_MAGIC_SCALARPACK; 1920 1921 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) { 1922 SV *key; 1923 if (HvEITER_get(hv)) 1924 /* we are in an iteration so the hash cannot be empty */ 1925 return &PL_sv_yes; 1926 /* no xhv_eiter so now use FIRSTKEY */ 1927 key = sv_newmortal(); 1928 magic_nextpack(MUTABLE_SV(hv), mg, key); 1929 HvEITER_set(hv, NULL); /* need to reset iterator */ 1930 return SvOK(key) ? &PL_sv_yes : &PL_sv_no; 1931 } 1932 1933 /* there is a SCALAR method that we can call */ 1934 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0); 1935 if (!retval) 1936 retval = &PL_sv_undef; 1937 return retval; 1938 } 1939 1940 int 1941 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg) 1942 { 1943 dVAR; 1944 GV * const gv = PL_DBline; 1945 const I32 i = SvTRUE(sv); 1946 SV ** const svp = av_fetch(GvAV(gv), 1947 atoi(MgPV_nolen_const(mg)), FALSE); 1948 1949 PERL_ARGS_ASSERT_MAGIC_SETDBLINE; 1950 1951 if (svp && SvIOKp(*svp)) { 1952 OP * const o = INT2PTR(OP*,SvIVX(*svp)); 1953 if (o) { 1954 #ifdef PERL_DEBUG_READONLY_OPS 1955 Slab_to_rw(OpSLAB(o)); 1956 #endif 1957 /* set or clear breakpoint in the relevant control op */ 1958 if (i) 1959 o->op_flags |= OPf_SPECIAL; 1960 else 1961 o->op_flags &= ~OPf_SPECIAL; 1962 #ifdef PERL_DEBUG_READONLY_OPS 1963 Slab_to_ro(OpSLAB(o)); 1964 #endif 1965 } 1966 } 1967 return 0; 1968 } 1969 1970 int 1971 Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg) 1972 { 1973 dVAR; 1974 AV * const obj = MUTABLE_AV(mg->mg_obj); 1975 1976 PERL_ARGS_ASSERT_MAGIC_GETARYLEN; 1977 1978 if (obj) { 1979 sv_setiv(sv, AvFILL(obj)); 1980 } else { 1981 SvOK_off(sv); 1982 } 1983 return 0; 1984 } 1985 1986 int 1987 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg) 1988 { 1989 dVAR; 1990 AV * const obj = MUTABLE_AV(mg->mg_obj); 1991 1992 PERL_ARGS_ASSERT_MAGIC_SETARYLEN; 1993 1994 if (obj) { 1995 av_fill(obj, SvIV(sv)); 1996 } else { 1997 Perl_ck_warner(aTHX_ packWARN(WARN_MISC), 1998 "Attempt to set length of freed array"); 1999 } 2000 return 0; 2001 } 2002 2003 int 2004 Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg) 2005 { 2006 dVAR; 2007 2008 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P; 2009 PERL_UNUSED_ARG(sv); 2010 2011 /* Reset the iterator when the array is cleared */ 2012 #if IVSIZE == I32SIZE 2013 *((IV *) &(mg->mg_len)) = 0; 2014 #else 2015 if (mg->mg_ptr) 2016 *((IV *) mg->mg_ptr) = 0; 2017 #endif 2018 2019 return 0; 2020 } 2021 2022 int 2023 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg) 2024 { 2025 dVAR; 2026 2027 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P; 2028 PERL_UNUSED_ARG(sv); 2029 2030 /* during global destruction, mg_obj may already have been freed */ 2031 if (PL_in_clean_all) 2032 return 0; 2033 2034 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen); 2035 2036 if (mg) { 2037 /* arylen scalar holds a pointer back to the array, but doesn't own a 2038 reference. Hence the we (the array) are about to go away with it 2039 still pointing at us. Clear its pointer, else it would be pointing 2040 at free memory. See the comment in sv_magic about reference loops, 2041 and why it can't own a reference to us. */ 2042 mg->mg_obj = 0; 2043 } 2044 return 0; 2045 } 2046 2047 int 2048 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg) 2049 { 2050 dVAR; 2051 SV* const lsv = LvTARG(sv); 2052 2053 PERL_ARGS_ASSERT_MAGIC_GETPOS; 2054 PERL_UNUSED_ARG(mg); 2055 2056 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) { 2057 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global); 2058 if (found && found->mg_len >= 0) { 2059 I32 i = found->mg_len; 2060 if (DO_UTF8(lsv)) 2061 sv_pos_b2u(lsv, &i); 2062 sv_setiv(sv, i); 2063 return 0; 2064 } 2065 } 2066 SvOK_off(sv); 2067 return 0; 2068 } 2069 2070 int 2071 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg) 2072 { 2073 dVAR; 2074 SV* const lsv = LvTARG(sv); 2075 SSize_t pos; 2076 STRLEN len; 2077 STRLEN ulen = 0; 2078 MAGIC* found; 2079 const char *s; 2080 2081 PERL_ARGS_ASSERT_MAGIC_SETPOS; 2082 PERL_UNUSED_ARG(mg); 2083 2084 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) 2085 found = mg_find(lsv, PERL_MAGIC_regex_global); 2086 else 2087 found = NULL; 2088 if (!found) { 2089 if (!SvOK(sv)) 2090 return 0; 2091 #ifdef PERL_OLD_COPY_ON_WRITE 2092 if (SvIsCOW(lsv)) 2093 sv_force_normal_flags(lsv, 0); 2094 #endif 2095 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob, 2096 NULL, 0); 2097 } 2098 else if (!SvOK(sv)) { 2099 found->mg_len = -1; 2100 return 0; 2101 } 2102 s = SvPV_const(lsv, len); 2103 2104 pos = SvIV(sv); 2105 2106 if (DO_UTF8(lsv)) { 2107 ulen = sv_or_pv_len_utf8(lsv, s, len); 2108 if (ulen) 2109 len = ulen; 2110 } 2111 2112 if (pos < 0) { 2113 pos += len; 2114 if (pos < 0) 2115 pos = 0; 2116 } 2117 else if (pos > (SSize_t)len) 2118 pos = len; 2119 2120 if (ulen) { 2121 pos = sv_or_pv_pos_u2b(lsv, s, pos, 0); 2122 } 2123 2124 found->mg_len = pos; 2125 found->mg_flags &= ~MGf_MINMATCH; 2126 2127 return 0; 2128 } 2129 2130 int 2131 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg) 2132 { 2133 STRLEN len; 2134 SV * const lsv = LvTARG(sv); 2135 const char * const tmps = SvPV_const(lsv,len); 2136 STRLEN offs = LvTARGOFF(sv); 2137 STRLEN rem = LvTARGLEN(sv); 2138 const bool negoff = LvFLAGS(sv) & 1; 2139 const bool negrem = LvFLAGS(sv) & 2; 2140 2141 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR; 2142 PERL_UNUSED_ARG(mg); 2143 2144 if (!translate_substr_offsets( 2145 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len, 2146 negoff ? -(IV)offs : (IV)offs, !negoff, 2147 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem 2148 )) { 2149 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string"); 2150 sv_setsv_nomg(sv, &PL_sv_undef); 2151 return 0; 2152 } 2153 2154 if (SvUTF8(lsv)) 2155 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem); 2156 sv_setpvn(sv, tmps + offs, rem); 2157 if (SvUTF8(lsv)) 2158 SvUTF8_on(sv); 2159 return 0; 2160 } 2161 2162 int 2163 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg) 2164 { 2165 dVAR; 2166 STRLEN len, lsv_len, oldtarglen, newtarglen; 2167 const char * const tmps = SvPV_const(sv, len); 2168 SV * const lsv = LvTARG(sv); 2169 STRLEN lvoff = LvTARGOFF(sv); 2170 STRLEN lvlen = LvTARGLEN(sv); 2171 const bool negoff = LvFLAGS(sv) & 1; 2172 const bool neglen = LvFLAGS(sv) & 2; 2173 2174 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR; 2175 PERL_UNUSED_ARG(mg); 2176 2177 SvGETMAGIC(lsv); 2178 if (SvROK(lsv)) 2179 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), 2180 "Attempt to use reference as lvalue in substr" 2181 ); 2182 SvPV_force_nomg(lsv,lsv_len); 2183 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv); 2184 if (!translate_substr_offsets( 2185 lsv_len, 2186 negoff ? -(IV)lvoff : (IV)lvoff, !negoff, 2187 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen 2188 )) 2189 Perl_croak(aTHX_ "substr outside of string"); 2190 oldtarglen = lvlen; 2191 if (DO_UTF8(sv)) { 2192 sv_utf8_upgrade_nomg(lsv); 2193 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN); 2194 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0); 2195 newtarglen = sv_or_pv_len_utf8(sv, tmps, len); 2196 SvUTF8_on(lsv); 2197 } 2198 else if (SvUTF8(lsv)) { 2199 const char *utf8; 2200 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN); 2201 newtarglen = len; 2202 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len); 2203 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0); 2204 Safefree(utf8); 2205 } 2206 else { 2207 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0); 2208 newtarglen = len; 2209 } 2210 if (!neglen) LvTARGLEN(sv) = newtarglen; 2211 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen; 2212 2213 return 0; 2214 } 2215 2216 int 2217 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg) 2218 { 2219 dVAR; 2220 2221 PERL_ARGS_ASSERT_MAGIC_GETTAINT; 2222 PERL_UNUSED_ARG(sv); 2223 #ifdef NO_TAINT_SUPPORT 2224 PERL_UNUSED_ARG(mg); 2225 #endif 2226 2227 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1)); 2228 return 0; 2229 } 2230 2231 int 2232 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg) 2233 { 2234 dVAR; 2235 2236 PERL_ARGS_ASSERT_MAGIC_SETTAINT; 2237 PERL_UNUSED_ARG(sv); 2238 2239 /* update taint status */ 2240 if (TAINT_get) 2241 mg->mg_len |= 1; 2242 else 2243 mg->mg_len &= ~1; 2244 return 0; 2245 } 2246 2247 int 2248 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg) 2249 { 2250 SV * const lsv = LvTARG(sv); 2251 2252 PERL_ARGS_ASSERT_MAGIC_GETVEC; 2253 PERL_UNUSED_ARG(mg); 2254 2255 if (lsv) 2256 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv))); 2257 else 2258 SvOK_off(sv); 2259 2260 return 0; 2261 } 2262 2263 int 2264 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg) 2265 { 2266 PERL_ARGS_ASSERT_MAGIC_SETVEC; 2267 PERL_UNUSED_ARG(mg); 2268 do_vecset(sv); /* XXX slurp this routine */ 2269 return 0; 2270 } 2271 2272 int 2273 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg) 2274 { 2275 dVAR; 2276 SV *targ = NULL; 2277 2278 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM; 2279 2280 if (LvTARGLEN(sv)) { 2281 if (mg->mg_obj) { 2282 SV * const ahv = LvTARG(sv); 2283 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0); 2284 if (he) 2285 targ = HeVAL(he); 2286 } 2287 else { 2288 AV *const av = MUTABLE_AV(LvTARG(sv)); 2289 if ((I32)LvTARGOFF(sv) <= AvFILL(av)) 2290 targ = AvARRAY(av)[LvTARGOFF(sv)]; 2291 } 2292 if (targ && (targ != &PL_sv_undef)) { 2293 /* somebody else defined it for us */ 2294 SvREFCNT_dec(LvTARG(sv)); 2295 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ); 2296 LvTARGLEN(sv) = 0; 2297 SvREFCNT_dec(mg->mg_obj); 2298 mg->mg_obj = NULL; 2299 mg->mg_flags &= ~MGf_REFCOUNTED; 2300 } 2301 } 2302 else 2303 targ = LvTARG(sv); 2304 sv_setsv(sv, targ ? targ : &PL_sv_undef); 2305 return 0; 2306 } 2307 2308 int 2309 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg) 2310 { 2311 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM; 2312 PERL_UNUSED_ARG(mg); 2313 if (LvTARGLEN(sv)) 2314 vivify_defelem(sv); 2315 if (LvTARG(sv)) { 2316 sv_setsv(LvTARG(sv), sv); 2317 SvSETMAGIC(LvTARG(sv)); 2318 } 2319 return 0; 2320 } 2321 2322 void 2323 Perl_vivify_defelem(pTHX_ SV *sv) 2324 { 2325 dVAR; 2326 MAGIC *mg; 2327 SV *value = NULL; 2328 2329 PERL_ARGS_ASSERT_VIVIFY_DEFELEM; 2330 2331 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem))) 2332 return; 2333 if (mg->mg_obj) { 2334 SV * const ahv = LvTARG(sv); 2335 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0); 2336 if (he) 2337 value = HeVAL(he); 2338 if (!value || value == &PL_sv_undef) 2339 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj)); 2340 } 2341 else { 2342 AV *const av = MUTABLE_AV(LvTARG(sv)); 2343 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av)) 2344 LvTARG(sv) = NULL; /* array can't be extended */ 2345 else { 2346 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE); 2347 if (!svp || (value = *svp) == &PL_sv_undef) 2348 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv)); 2349 } 2350 } 2351 SvREFCNT_inc_simple_void(value); 2352 SvREFCNT_dec(LvTARG(sv)); 2353 LvTARG(sv) = value; 2354 LvTARGLEN(sv) = 0; 2355 SvREFCNT_dec(mg->mg_obj); 2356 mg->mg_obj = NULL; 2357 mg->mg_flags &= ~MGf_REFCOUNTED; 2358 } 2359 2360 int 2361 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg) 2362 { 2363 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS; 2364 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj)); 2365 return 0; 2366 } 2367 2368 int 2369 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg) 2370 { 2371 PERL_ARGS_ASSERT_MAGIC_SETMGLOB; 2372 PERL_UNUSED_CONTEXT; 2373 PERL_UNUSED_ARG(sv); 2374 mg->mg_len = -1; 2375 return 0; 2376 } 2377 2378 int 2379 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg) 2380 { 2381 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr; 2382 2383 PERL_ARGS_ASSERT_MAGIC_SETUVAR; 2384 2385 if (uf && uf->uf_set) 2386 (*uf->uf_set)(aTHX_ uf->uf_index, sv); 2387 return 0; 2388 } 2389 2390 int 2391 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg) 2392 { 2393 const char type = mg->mg_type; 2394 2395 PERL_ARGS_ASSERT_MAGIC_SETREGEXP; 2396 2397 if (type == PERL_MAGIC_qr) { 2398 } else if (type == PERL_MAGIC_bm) { 2399 SvTAIL_off(sv); 2400 SvVALID_off(sv); 2401 } else { 2402 assert(type == PERL_MAGIC_fm); 2403 } 2404 return sv_unmagic(sv, type); 2405 } 2406 2407 #ifdef USE_LOCALE_COLLATE 2408 int 2409 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg) 2410 { 2411 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM; 2412 2413 /* 2414 * RenE<eacute> Descartes said "I think not." 2415 * and vanished with a faint plop. 2416 */ 2417 PERL_UNUSED_CONTEXT; 2418 PERL_UNUSED_ARG(sv); 2419 if (mg->mg_ptr) { 2420 Safefree(mg->mg_ptr); 2421 mg->mg_ptr = NULL; 2422 mg->mg_len = -1; 2423 } 2424 return 0; 2425 } 2426 #endif /* USE_LOCALE_COLLATE */ 2427 2428 /* Just clear the UTF-8 cache data. */ 2429 int 2430 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg) 2431 { 2432 PERL_ARGS_ASSERT_MAGIC_SETUTF8; 2433 PERL_UNUSED_CONTEXT; 2434 PERL_UNUSED_ARG(sv); 2435 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */ 2436 mg->mg_ptr = NULL; 2437 mg->mg_len = -1; /* The mg_len holds the len cache. */ 2438 return 0; 2439 } 2440 2441 int 2442 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg) 2443 { 2444 dVAR; 2445 const char *s; 2446 I32 paren; 2447 const REGEXP * rx; 2448 const char * const remaining = mg->mg_ptr + 1; 2449 I32 i; 2450 STRLEN len; 2451 MAGIC *tmg; 2452 2453 PERL_ARGS_ASSERT_MAGIC_SET; 2454 2455 switch (*mg->mg_ptr) { 2456 case '\015': /* $^MATCH */ 2457 if (strEQ(remaining, "ATCH")) 2458 goto do_match; 2459 case '`': /* ${^PREMATCH} caught below */ 2460 do_prematch: 2461 paren = RX_BUFF_IDX_PREMATCH; 2462 goto setparen; 2463 case '\'': /* ${^POSTMATCH} caught below */ 2464 do_postmatch: 2465 paren = RX_BUFF_IDX_POSTMATCH; 2466 goto setparen; 2467 case '&': 2468 do_match: 2469 paren = RX_BUFF_IDX_FULLMATCH; 2470 goto setparen; 2471 case '1': case '2': case '3': case '4': 2472 case '5': case '6': case '7': case '8': case '9': 2473 paren = atoi(mg->mg_ptr); 2474 setparen: 2475 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) { 2476 setparen_got_rx: 2477 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv); 2478 } else { 2479 /* Croak with a READONLY error when a numbered match var is 2480 * set without a previous pattern match. Unless it's C<local $1> 2481 */ 2482 croakparen: 2483 if (!PL_localizing) { 2484 Perl_croak_no_modify(); 2485 } 2486 } 2487 break; 2488 case '\001': /* ^A */ 2489 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv); 2490 else SvOK_off(PL_bodytarget); 2491 FmLINES(PL_bodytarget) = 0; 2492 if (SvPOK(PL_bodytarget)) { 2493 char *s = SvPVX(PL_bodytarget); 2494 while ( ((s = strchr(s, '\n'))) ) { 2495 FmLINES(PL_bodytarget)++; 2496 s++; 2497 } 2498 } 2499 /* mg_set() has temporarily made sv non-magical */ 2500 if (TAINTING_get) { 2501 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1) 2502 SvTAINTED_on(PL_bodytarget); 2503 else 2504 SvTAINTED_off(PL_bodytarget); 2505 } 2506 break; 2507 case '\003': /* ^C */ 2508 PL_minus_c = cBOOL(SvIV(sv)); 2509 break; 2510 2511 case '\004': /* ^D */ 2512 #ifdef DEBUGGING 2513 s = SvPV_nolen_const(sv); 2514 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG; 2515 if (DEBUG_x_TEST || DEBUG_B_TEST) 2516 dump_all_perl(!DEBUG_B_TEST); 2517 #else 2518 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG; 2519 #endif 2520 break; 2521 case '\005': /* ^E */ 2522 if (*(mg->mg_ptr+1) == '\0') { 2523 #ifdef VMS 2524 set_vaxc_errno(SvIV(sv)); 2525 #else 2526 # ifdef WIN32 2527 SetLastError( SvIV(sv) ); 2528 # else 2529 # ifdef OS2 2530 os2_setsyserrno(SvIV(sv)); 2531 # else 2532 /* will anyone ever use this? */ 2533 SETERRNO(SvIV(sv), 4); 2534 # endif 2535 # endif 2536 #endif 2537 } 2538 else if (strEQ(mg->mg_ptr+1, "NCODING")) { 2539 SvREFCNT_dec(PL_encoding); 2540 if (SvOK(sv) || SvGMAGICAL(sv)) { 2541 PL_encoding = newSVsv(sv); 2542 } 2543 else { 2544 PL_encoding = NULL; 2545 } 2546 } 2547 break; 2548 case '\006': /* ^F */ 2549 PL_maxsysfd = SvIV(sv); 2550 break; 2551 case '\010': /* ^H */ 2552 PL_hints = SvIV(sv); 2553 break; 2554 case '\011': /* ^I */ /* NOT \t in EBCDIC */ 2555 Safefree(PL_inplace); 2556 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL; 2557 break; 2558 case '\016': /* ^N */ 2559 if (PL_curpm && (rx = PM_GETRE(PL_curpm)) 2560 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx; 2561 goto croakparen; 2562 case '\017': /* ^O */ 2563 if (*(mg->mg_ptr+1) == '\0') { 2564 Safefree(PL_osname); 2565 PL_osname = NULL; 2566 if (SvOK(sv)) { 2567 TAINT_PROPER("assigning to $^O"); 2568 PL_osname = savesvpv(sv); 2569 } 2570 } 2571 else if (strEQ(mg->mg_ptr, "\017PEN")) { 2572 STRLEN len; 2573 const char *const start = SvPV(sv, len); 2574 const char *out = (const char*)memchr(start, '\0', len); 2575 SV *tmp; 2576 2577 2578 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT; 2579 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT; 2580 2581 /* Opening for input is more common than opening for output, so 2582 ensure that hints for input are sooner on linked list. */ 2583 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1, 2584 SvUTF8(sv)) 2585 : newSVpvs_flags("", SvUTF8(sv)); 2586 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp); 2587 mg_set(tmp); 2588 2589 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len, 2590 SvUTF8(sv)); 2591 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp); 2592 mg_set(tmp); 2593 } 2594 break; 2595 case '\020': /* ^P */ 2596 if (*remaining == '\0') { /* ^P */ 2597 PL_perldb = SvIV(sv); 2598 if (PL_perldb && !PL_DBsingle) 2599 init_debugger(); 2600 break; 2601 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */ 2602 goto do_prematch; 2603 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */ 2604 goto do_postmatch; 2605 } 2606 break; 2607 case '\024': /* ^T */ 2608 #ifdef BIG_TIME 2609 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv)); 2610 #else 2611 PL_basetime = (Time_t)SvIV(sv); 2612 #endif 2613 break; 2614 case '\025': /* ^UTF8CACHE */ 2615 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) { 2616 PL_utf8cache = (signed char) sv_2iv(sv); 2617 } 2618 break; 2619 case '\027': /* ^W & $^WARNING_BITS */ 2620 if (*(mg->mg_ptr+1) == '\0') { 2621 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) { 2622 i = SvIV(sv); 2623 PL_dowarn = (PL_dowarn & ~G_WARN_ON) 2624 | (i ? G_WARN_ON : G_WARN_OFF) ; 2625 } 2626 } 2627 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) { 2628 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) { 2629 if (!SvPOK(sv)) { 2630 PL_compiling.cop_warnings = pWARN_STD; 2631 break; 2632 } 2633 { 2634 STRLEN len, i; 2635 int accumulate = 0 ; 2636 int any_fatals = 0 ; 2637 const char * const ptr = SvPV_const(sv, len) ; 2638 for (i = 0 ; i < len ; ++i) { 2639 accumulate |= ptr[i] ; 2640 any_fatals |= (ptr[i] & 0xAA) ; 2641 } 2642 if (!accumulate) { 2643 if (!specialWARN(PL_compiling.cop_warnings)) 2644 PerlMemShared_free(PL_compiling.cop_warnings); 2645 PL_compiling.cop_warnings = pWARN_NONE; 2646 } 2647 /* Yuck. I can't see how to abstract this: */ 2648 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1, 2649 WARN_ALL) && !any_fatals) { 2650 if (!specialWARN(PL_compiling.cop_warnings)) 2651 PerlMemShared_free(PL_compiling.cop_warnings); 2652 PL_compiling.cop_warnings = pWARN_ALL; 2653 PL_dowarn |= G_WARN_ONCE ; 2654 } 2655 else { 2656 STRLEN len; 2657 const char *const p = SvPV_const(sv, len); 2658 2659 PL_compiling.cop_warnings 2660 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings, 2661 p, len); 2662 2663 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE)) 2664 PL_dowarn |= G_WARN_ONCE ; 2665 } 2666 2667 } 2668 } 2669 } 2670 break; 2671 case '.': 2672 if (PL_localizing) { 2673 if (PL_localizing == 1) 2674 SAVESPTR(PL_last_in_gv); 2675 } 2676 else if (SvOK(sv) && GvIO(PL_last_in_gv)) 2677 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv); 2678 break; 2679 case '^': 2680 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv))); 2681 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv); 2682 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO); 2683 break; 2684 case '~': 2685 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv))); 2686 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv); 2687 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO); 2688 break; 2689 case '=': 2690 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv)); 2691 break; 2692 case '-': 2693 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv)); 2694 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L) 2695 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L; 2696 break; 2697 case '%': 2698 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv)); 2699 break; 2700 case '|': 2701 { 2702 IO * const io = GvIO(PL_defoutgv); 2703 if(!io) 2704 break; 2705 if ((SvIV(sv)) == 0) 2706 IoFLAGS(io) &= ~IOf_FLUSH; 2707 else { 2708 if (!(IoFLAGS(io) & IOf_FLUSH)) { 2709 PerlIO *ofp = IoOFP(io); 2710 if (ofp) 2711 (void)PerlIO_flush(ofp); 2712 IoFLAGS(io) |= IOf_FLUSH; 2713 } 2714 } 2715 } 2716 break; 2717 case '/': 2718 SvREFCNT_dec(PL_rs); 2719 PL_rs = newSVsv(sv); 2720 break; 2721 case '\\': 2722 SvREFCNT_dec(PL_ors_sv); 2723 if (SvOK(sv)) { 2724 PL_ors_sv = newSVsv(sv); 2725 } 2726 else { 2727 PL_ors_sv = NULL; 2728 } 2729 break; 2730 case '[': 2731 if (SvIV(sv) != 0) 2732 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible"); 2733 break; 2734 case '?': 2735 #ifdef COMPLEX_STATUS 2736 if (PL_localizing == 2) { 2737 SvUPGRADE(sv, SVt_PVLV); 2738 PL_statusvalue = LvTARGOFF(sv); 2739 PL_statusvalue_vms = LvTARGLEN(sv); 2740 } 2741 else 2742 #endif 2743 #ifdef VMSISH_STATUS 2744 if (VMSISH_STATUS) 2745 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv)); 2746 else 2747 #endif 2748 STATUS_UNIX_EXIT_SET(SvIV(sv)); 2749 break; 2750 case '!': 2751 { 2752 #ifdef VMS 2753 # define PERL_VMS_BANG vaxc$errno 2754 #else 2755 # define PERL_VMS_BANG 0 2756 #endif 2757 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0, 2758 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG); 2759 } 2760 break; 2761 case '<': 2762 { 2763 const IV new_uid = SvIV(sv); 2764 PL_delaymagic_uid = new_uid; 2765 if (PL_delaymagic) { 2766 PL_delaymagic |= DM_RUID; 2767 break; /* don't do magic till later */ 2768 } 2769 #ifdef HAS_SETRUID 2770 (void)setruid((Uid_t)new_uid); 2771 #else 2772 #ifdef HAS_SETREUID 2773 (void)setreuid((Uid_t)new_uid, (Uid_t)-1); 2774 #else 2775 #ifdef HAS_SETRESUID 2776 (void)setresuid((Uid_t)new_uid, (Uid_t)-1, (Uid_t)-1); 2777 #else 2778 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */ 2779 #ifdef PERL_DARWIN 2780 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */ 2781 if (new_uid != 0 && PerlProc_getuid() == 0) 2782 (void)PerlProc_setuid(0); 2783 #endif 2784 (void)PerlProc_setuid(new_uid); 2785 } else { 2786 Perl_croak(aTHX_ "setruid() not implemented"); 2787 } 2788 #endif 2789 #endif 2790 #endif 2791 break; 2792 } 2793 case '>': 2794 { 2795 const UV new_euid = SvIV(sv); 2796 PL_delaymagic_euid = new_euid; 2797 if (PL_delaymagic) { 2798 PL_delaymagic |= DM_EUID; 2799 break; /* don't do magic till later */ 2800 } 2801 #ifdef HAS_SETEUID 2802 (void)seteuid((Uid_t)new_euid); 2803 #else 2804 #ifdef HAS_SETREUID 2805 (void)setreuid((Uid_t)-1, (Uid_t)new_euid); 2806 #else 2807 #ifdef HAS_SETRESUID 2808 (void)setresuid((Uid_t)-1, (Uid_t)new_euid, (Uid_t)-1); 2809 #else 2810 if (new_euid == PerlProc_getuid()) /* special case $> = $< */ 2811 PerlProc_setuid(new_euid); 2812 else { 2813 Perl_croak(aTHX_ "seteuid() not implemented"); 2814 } 2815 #endif 2816 #endif 2817 #endif 2818 break; 2819 } 2820 case '(': 2821 { 2822 const UV new_gid = SvIV(sv); 2823 PL_delaymagic_gid = new_gid; 2824 if (PL_delaymagic) { 2825 PL_delaymagic |= DM_RGID; 2826 break; /* don't do magic till later */ 2827 } 2828 #ifdef HAS_SETRGID 2829 (void)setrgid((Gid_t)new_gid); 2830 #else 2831 #ifdef HAS_SETREGID 2832 (void)setregid((Gid_t)new_gid, (Gid_t)-1); 2833 #else 2834 #ifdef HAS_SETRESGID 2835 (void)setresgid((Gid_t)new_gid, (Gid_t)-1, (Gid_t) -1); 2836 #else 2837 if (new_gid == PerlProc_getegid()) /* special case $( = $) */ 2838 (void)PerlProc_setgid(new_gid); 2839 else { 2840 Perl_croak(aTHX_ "setrgid() not implemented"); 2841 } 2842 #endif 2843 #endif 2844 #endif 2845 break; 2846 } 2847 case ')': 2848 { 2849 UV new_egid; 2850 #ifdef HAS_SETGROUPS 2851 { 2852 const char *p = SvPV_const(sv, len); 2853 Groups_t *gary = NULL; 2854 #ifdef _SC_NGROUPS_MAX 2855 int maxgrp = sysconf(_SC_NGROUPS_MAX); 2856 2857 if (maxgrp < 0) 2858 maxgrp = NGROUPS; 2859 #else 2860 int maxgrp = NGROUPS; 2861 #endif 2862 2863 while (isSPACE(*p)) 2864 ++p; 2865 new_egid = Atol(p); 2866 for (i = 0; i < maxgrp; ++i) { 2867 while (*p && !isSPACE(*p)) 2868 ++p; 2869 while (isSPACE(*p)) 2870 ++p; 2871 if (!*p) 2872 break; 2873 if(!gary) 2874 Newx(gary, i + 1, Groups_t); 2875 else 2876 Renew(gary, i + 1, Groups_t); 2877 gary[i] = Atol(p); 2878 } 2879 if (i) 2880 (void)setgroups(i, gary); 2881 Safefree(gary); 2882 } 2883 #else /* HAS_SETGROUPS */ 2884 new_egid = SvIV(sv); 2885 #endif /* HAS_SETGROUPS */ 2886 PL_delaymagic_egid = new_egid; 2887 if (PL_delaymagic) { 2888 PL_delaymagic |= DM_EGID; 2889 break; /* don't do magic till later */ 2890 } 2891 #ifdef HAS_SETEGID 2892 (void)setegid((Gid_t)new_egid); 2893 #else 2894 #ifdef HAS_SETREGID 2895 (void)setregid((Gid_t)-1, (Gid_t)new_egid); 2896 #else 2897 #ifdef HAS_SETRESGID 2898 (void)setresgid((Gid_t)-1, (Gid_t)new_egid, (Gid_t)-1); 2899 #else 2900 if (new_egid == PerlProc_getgid()) /* special case $) = $( */ 2901 (void)PerlProc_setgid(new_egid); 2902 else { 2903 Perl_croak(aTHX_ "setegid() not implemented"); 2904 } 2905 #endif 2906 #endif 2907 #endif 2908 break; 2909 } 2910 case ':': 2911 PL_chopset = SvPV_force(sv,len); 2912 break; 2913 case '$': /* $$ */ 2914 /* Store the pid in mg->mg_obj so we can tell when a fork has 2915 occurred. mg->mg_obj points to *$ by default, so clear it. */ 2916 if (isGV(mg->mg_obj)) { 2917 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */ 2918 SvREFCNT_dec(mg->mg_obj); 2919 mg->mg_flags |= MGf_REFCOUNTED; 2920 mg->mg_obj = newSViv((IV)PerlProc_getpid()); 2921 } 2922 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid()); 2923 break; 2924 case '0': 2925 LOCK_DOLLARZERO_MUTEX; 2926 #ifdef HAS_SETPROCTITLE 2927 /* The BSDs don't show the argv[] in ps(1) output, they 2928 * show a string from the process struct and provide 2929 * the setproctitle() routine to manipulate that. */ 2930 if (PL_origalen != 1) { 2931 s = SvPV_const(sv, len); 2932 # if __FreeBSD_version > 410001 2933 /* The leading "-" removes the "perl: " prefix, 2934 * but not the "(perl) suffix from the ps(1) 2935 * output, because that's what ps(1) shows if the 2936 * argv[] is modified. */ 2937 setproctitle("-%s", s); 2938 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */ 2939 /* This doesn't really work if you assume that 2940 * $0 = 'foobar'; will wipe out 'perl' from the $0 2941 * because in ps(1) output the result will be like 2942 * sprintf("perl: %s (perl)", s) 2943 * I guess this is a security feature: 2944 * one (a user process) cannot get rid of the original name. 2945 * --jhi */ 2946 setproctitle("%s", s); 2947 # endif 2948 } 2949 #elif defined(__hpux) && defined(PSTAT_SETCMD) 2950 if (PL_origalen != 1) { 2951 union pstun un; 2952 s = SvPV_const(sv, len); 2953 un.pst_command = (char *)s; 2954 pstat(PSTAT_SETCMD, un, len, 0, 0); 2955 } 2956 #else 2957 if (PL_origalen > 1) { 2958 /* PL_origalen is set in perl_parse(). */ 2959 s = SvPV_force(sv,len); 2960 if (len >= (STRLEN)PL_origalen-1) { 2961 /* Longer than original, will be truncated. We assume that 2962 * PL_origalen bytes are available. */ 2963 Copy(s, PL_origargv[0], PL_origalen-1, char); 2964 } 2965 else { 2966 /* Shorter than original, will be padded. */ 2967 #ifdef PERL_DARWIN 2968 /* Special case for Mac OS X: see [perl #38868] */ 2969 const int pad = 0; 2970 #else 2971 /* Is the space counterintuitive? Yes. 2972 * (You were expecting \0?) 2973 * Does it work? Seems to. (In Linux 2.4.20 at least.) 2974 * --jhi */ 2975 const int pad = ' '; 2976 #endif 2977 Copy(s, PL_origargv[0], len, char); 2978 PL_origargv[0][len] = 0; 2979 memset(PL_origargv[0] + len + 1, 2980 pad, PL_origalen - len - 1); 2981 } 2982 PL_origargv[0][PL_origalen-1] = 0; 2983 for (i = 1; i < PL_origargc; i++) 2984 PL_origargv[i] = 0; 2985 #ifdef HAS_PRCTL_SET_NAME 2986 /* Set the legacy process name in addition to the POSIX name on Linux */ 2987 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) { 2988 /* diag_listed_as: SKIPME */ 2989 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno)); 2990 } 2991 #endif 2992 } 2993 #endif 2994 UNLOCK_DOLLARZERO_MUTEX; 2995 break; 2996 } 2997 return 0; 2998 } 2999 3000 I32 3001 Perl_whichsig_sv(pTHX_ SV *sigsv) 3002 { 3003 const char *sigpv; 3004 STRLEN siglen; 3005 PERL_ARGS_ASSERT_WHICHSIG_SV; 3006 PERL_UNUSED_CONTEXT; 3007 sigpv = SvPV_const(sigsv, siglen); 3008 return whichsig_pvn(sigpv, siglen); 3009 } 3010 3011 I32 3012 Perl_whichsig_pv(pTHX_ const char *sig) 3013 { 3014 PERL_ARGS_ASSERT_WHICHSIG_PV; 3015 PERL_UNUSED_CONTEXT; 3016 return whichsig_pvn(sig, strlen(sig)); 3017 } 3018 3019 I32 3020 Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len) 3021 { 3022 char* const* sigv; 3023 3024 PERL_ARGS_ASSERT_WHICHSIG_PVN; 3025 PERL_UNUSED_CONTEXT; 3026 3027 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++) 3028 if (strlen(*sigv) == len && memEQ(sig,*sigv, len)) 3029 return PL_sig_num[sigv - (char* const*)PL_sig_name]; 3030 #ifdef SIGCLD 3031 if (memEQs(sig, len, "CHLD")) 3032 return SIGCLD; 3033 #endif 3034 #ifdef SIGCHLD 3035 if (memEQs(sig, len, "CLD")) 3036 return SIGCHLD; 3037 #endif 3038 return -1; 3039 } 3040 3041 Signal_t 3042 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO) 3043 Perl_sighandler(int sig, siginfo_t *sip, void *uap) 3044 #else 3045 Perl_sighandler(int sig) 3046 #endif 3047 { 3048 #ifdef PERL_GET_SIG_CONTEXT 3049 dTHXa(PERL_GET_SIG_CONTEXT); 3050 #else 3051 dTHX; 3052 #endif 3053 dSP; 3054 GV *gv = NULL; 3055 SV *sv = NULL; 3056 SV * const tSv = PL_Sv; 3057 CV *cv = NULL; 3058 OP *myop = PL_op; 3059 U32 flags = 0; 3060 XPV * const tXpv = PL_Xpv; 3061 I32 old_ss_ix = PL_savestack_ix; 3062 SV *errsv_save = NULL; 3063 3064 3065 if (!PL_psig_ptr[sig]) { 3066 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n", 3067 PL_sig_name[sig]); 3068 exit(sig); 3069 } 3070 3071 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) { 3072 /* Max number of items pushed there is 3*n or 4. We cannot fix 3073 infinity, so we fix 4 (in fact 5): */ 3074 if (PL_savestack_ix + 15 <= PL_savestack_max) { 3075 flags |= 1; 3076 PL_savestack_ix += 5; /* Protect save in progress. */ 3077 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL); 3078 } 3079 } 3080 /* sv_2cv is too complicated, try a simpler variant first: */ 3081 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig]))) 3082 || SvTYPE(cv) != SVt_PVCV) { 3083 HV *st; 3084 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD); 3085 } 3086 3087 if (!cv || !CvROOT(cv)) { 3088 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n", 3089 PL_sig_name[sig], (gv ? GvENAME(gv) 3090 : ((cv && CvGV(cv)) 3091 ? GvENAME(CvGV(cv)) 3092 : "__ANON__"))); 3093 goto cleanup; 3094 } 3095 3096 sv = PL_psig_name[sig] 3097 ? SvREFCNT_inc_NN(PL_psig_name[sig]) 3098 : newSVpv(PL_sig_name[sig],0); 3099 flags |= 8; 3100 SAVEFREESV(sv); 3101 3102 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) { 3103 /* make sure our assumption about the size of the SAVEs are correct: 3104 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */ 3105 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix); 3106 } 3107 3108 PUSHSTACKi(PERLSI_SIGNAL); 3109 PUSHMARK(SP); 3110 PUSHs(sv); 3111 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO) 3112 { 3113 struct sigaction oact; 3114 3115 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) { 3116 if (sip) { 3117 HV *sih = newHV(); 3118 SV *rv = newRV_noinc(MUTABLE_SV(sih)); 3119 /* The siginfo fields signo, code, errno, pid, uid, 3120 * addr, status, and band are defined by POSIX/SUSv3. */ 3121 (void)hv_stores(sih, "signo", newSViv(sip->si_signo)); 3122 (void)hv_stores(sih, "code", newSViv(sip->si_code)); 3123 #if 0 /* XXX TODO: Configure scan for the existence of these, but even that does not help if the SA_SIGINFO is not implemented according to the spec. */ 3124 hv_stores(sih, "errno", newSViv(sip->si_errno)); 3125 hv_stores(sih, "status", newSViv(sip->si_status)); 3126 hv_stores(sih, "uid", newSViv(sip->si_uid)); 3127 hv_stores(sih, "pid", newSViv(sip->si_pid)); 3128 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr))); 3129 hv_stores(sih, "band", newSViv(sip->si_band)); 3130 #endif 3131 EXTEND(SP, 2); 3132 PUSHs(rv); 3133 mPUSHp((char *)sip, sizeof(*sip)); 3134 } 3135 3136 } 3137 } 3138 #endif 3139 PUTBACK; 3140 3141 errsv_save = newSVsv(ERRSV); 3142 3143 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL); 3144 3145 POPSTACK; 3146 { 3147 SV * const errsv = ERRSV; 3148 if (SvTRUE_NN(errsv)) { 3149 SvREFCNT_dec(errsv_save); 3150 #ifndef PERL_MICRO 3151 /* Handler "died", for example to get out of a restart-able read(). 3152 * Before we re-do that on its behalf re-enable the signal which was 3153 * blocked by the system when we entered. 3154 */ 3155 #ifdef HAS_SIGPROCMASK 3156 #if defined(HAS_SIGACTION) && defined(SA_SIGINFO) 3157 if (sip || uap) 3158 #endif 3159 { 3160 sigset_t set; 3161 sigemptyset(&set); 3162 sigaddset(&set,sig); 3163 sigprocmask(SIG_UNBLOCK, &set, NULL); 3164 } 3165 #else 3166 /* Not clear if this will work */ 3167 (void)rsignal(sig, SIG_IGN); 3168 (void)rsignal(sig, PL_csighandlerp); 3169 #endif 3170 #endif /* !PERL_MICRO */ 3171 die_sv(errsv); 3172 } 3173 else { 3174 sv_setsv(errsv, errsv_save); 3175 SvREFCNT_dec(errsv_save); 3176 } 3177 } 3178 3179 cleanup: 3180 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */ 3181 PL_savestack_ix = old_ss_ix; 3182 if (flags & 8) 3183 SvREFCNT_dec(sv); 3184 PL_op = myop; /* Apparently not needed... */ 3185 3186 PL_Sv = tSv; /* Restore global temporaries. */ 3187 PL_Xpv = tXpv; 3188 return; 3189 } 3190 3191 3192 static void 3193 S_restore_magic(pTHX_ const void *p) 3194 { 3195 dVAR; 3196 MGS* const mgs = SSPTR(PTR2IV(p), MGS*); 3197 SV* const sv = mgs->mgs_sv; 3198 bool bumped; 3199 3200 if (!sv) 3201 return; 3202 3203 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) { 3204 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */ 3205 #ifdef PERL_OLD_COPY_ON_WRITE 3206 /* While magic was saved (and off) sv_setsv may well have seen 3207 this SV as a prime candidate for COW. */ 3208 if (SvIsCOW(sv)) 3209 sv_force_normal_flags(sv, 0); 3210 #endif 3211 if (mgs->mgs_readonly) 3212 SvREADONLY_on(sv); 3213 if (mgs->mgs_magical) 3214 SvFLAGS(sv) |= mgs->mgs_magical; 3215 else 3216 mg_magical(sv); 3217 } 3218 3219 bumped = mgs->mgs_bumped; 3220 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */ 3221 3222 /* If we're still on top of the stack, pop us off. (That condition 3223 * will be satisfied if restore_magic was called explicitly, but *not* 3224 * if it's being called via leave_scope.) 3225 * The reason for doing this is that otherwise, things like sv_2cv() 3226 * may leave alloc gunk on the savestack, and some code 3227 * (e.g. sighandler) doesn't expect that... 3228 */ 3229 if (PL_savestack_ix == mgs->mgs_ss_ix) 3230 { 3231 UV popval = SSPOPUV; 3232 assert(popval == SAVEt_DESTRUCTOR_X); 3233 PL_savestack_ix -= 2; 3234 popval = SSPOPUV; 3235 assert((popval & SAVE_MASK) == SAVEt_ALLOC); 3236 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT; 3237 } 3238 if (bumped) { 3239 if (SvREFCNT(sv) == 1) { 3240 /* We hold the last reference to this SV, which implies that the 3241 SV was deleted as a side effect of the routines we called. 3242 So artificially keep it alive a bit longer. 3243 We avoid turning on the TEMP flag, which can cause the SV's 3244 buffer to get stolen (and maybe other stuff). */ 3245 sv_2mortal(sv); 3246 SvTEMP_off(sv); 3247 } 3248 else 3249 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */ 3250 } 3251 } 3252 3253 /* clean up the mess created by Perl_sighandler(). 3254 * Note that this is only called during an exit in a signal handler; 3255 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually 3256 * skipped over. */ 3257 3258 static void 3259 S_unwind_handler_stack(pTHX_ const void *p) 3260 { 3261 dVAR; 3262 PERL_UNUSED_ARG(p); 3263 3264 PL_savestack_ix -= 5; /* Unprotect save in progress. */ 3265 } 3266 3267 /* 3268 =for apidoc magic_sethint 3269 3270 Triggered by a store to %^H, records the key/value pair to 3271 C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing 3272 anything that would need a deep copy. Maybe we should warn if we find a 3273 reference. 3274 3275 =cut 3276 */ 3277 int 3278 Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg) 3279 { 3280 dVAR; 3281 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr) 3282 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP); 3283 3284 PERL_ARGS_ASSERT_MAGIC_SETHINT; 3285 3286 /* mg->mg_obj isn't being used. If needed, it would be possible to store 3287 an alternative leaf in there, with PL_compiling.cop_hints being used if 3288 it's NULL. If needed for threads, the alternative could lock a mutex, 3289 or take other more complex action. */ 3290 3291 /* Something changed in %^H, so it will need to be restored on scope exit. 3292 Doing this here saves a lot of doing it manually in perl code (and 3293 forgetting to do it, and consequent subtle errors. */ 3294 PL_hints |= HINT_LOCALIZE_HH; 3295 CopHINTHASH_set(&PL_compiling, 3296 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0)); 3297 return 0; 3298 } 3299 3300 /* 3301 =for apidoc magic_clearhint 3302 3303 Triggered by a delete from %^H, records the key to 3304 C<PL_compiling.cop_hints_hash>. 3305 3306 =cut 3307 */ 3308 int 3309 Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg) 3310 { 3311 dVAR; 3312 3313 PERL_ARGS_ASSERT_MAGIC_CLEARHINT; 3314 PERL_UNUSED_ARG(sv); 3315 3316 PL_hints |= HINT_LOCALIZE_HH; 3317 CopHINTHASH_set(&PL_compiling, 3318 mg->mg_len == HEf_SVKEY 3319 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling), 3320 MUTABLE_SV(mg->mg_ptr), 0, 0) 3321 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling), 3322 mg->mg_ptr, mg->mg_len, 0, 0)); 3323 return 0; 3324 } 3325 3326 /* 3327 =for apidoc magic_clearhints 3328 3329 Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>. 3330 3331 =cut 3332 */ 3333 int 3334 Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg) 3335 { 3336 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS; 3337 PERL_UNUSED_ARG(sv); 3338 PERL_UNUSED_ARG(mg); 3339 cophh_free(CopHINTHASH_get(&PL_compiling)); 3340 CopHINTHASH_set(&PL_compiling, cophh_new_empty()); 3341 return 0; 3342 } 3343 3344 int 3345 Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv, 3346 const char *name, I32 namlen) 3347 { 3348 MAGIC *nmg; 3349 3350 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER; 3351 PERL_UNUSED_ARG(sv); 3352 PERL_UNUSED_ARG(name); 3353 PERL_UNUSED_ARG(namlen); 3354 3355 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0); 3356 nmg = mg_find(nsv, mg->mg_type); 3357 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj); 3358 nmg->mg_ptr = mg->mg_ptr; 3359 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj); 3360 nmg->mg_flags |= MGf_REFCOUNTED; 3361 return 1; 3362 } 3363 3364 /* 3365 * Local variables: 3366 * c-indentation-style: bsd 3367 * c-basic-offset: 4 3368 * indent-tabs-mode: nil 3369 * End: 3370 * 3371 * ex: set ts=8 sts=4 sw=4 et: 3372 */ 3373