1 #include "dat.h" 2 #include "fns.h" 3 #include "error.h" 4 #undef getwd 5 #include <signal.h> 6 #include <sys/socket.h> 7 #include <time.h> 8 #include <sys/time.h> 9 #include <termios.h> 10 #include <sched.h> 11 #include <pwd.h> 12 #include <errno.h> 13 #include <unistd.h> 14 #include <sys/resource.h> 15 #include <fpuctl.h> 16 17 enum 18 { 19 DELETE = 0x7F, 20 NSTACKSPERALLOC = 16, 21 X11STACK= 256*1024 22 }; 23 char *hosttype = "FreeBSD"; 24 25 extern void unlockandexit(int*); 26 extern void executeonnewstack(void*, void (*f)(void*), void*); 27 static void *stackalloc(Proc *p, void **tos); 28 static void stackfreeandexit(void *stack); 29 30 extern int dflag; 31 32 void 33 pexit(char *msg, int t) 34 { 35 Osenv *e; 36 Proc *p; 37 void *kstack; 38 39 lock(&procs.l); 40 p = up; 41 if(p->prev) 42 p->prev->next = p->next; 43 else 44 procs.head = p->next; 45 46 if(up->next) 47 p->next->prev = p->prev; 48 else 49 procs.tail = p->prev; 50 unlock(&procs.l); 51 52 if(0) 53 print("pexit: %s: %s\n", up->text, msg); 54 55 e = up->env; 56 if(e != nil) { 57 closefgrp(e->fgrp); 58 closepgrp(e->pgrp); 59 closeegrp(e->egrp); 60 closesigs(e->sigs); 61 } 62 kstack = p->kstack; 63 free(p->prog); 64 free(p); 65 if(kstack != nil) 66 stackfreeandexit(kstack); 67 } 68 69 void 70 trapBUS(int signo, siginfo_t *info, void *context) 71 { 72 if(info) 73 print("trapBUS: signo: %d code: %d addr: %lx\n", 74 info->si_signo, info->si_code, info->si_addr); 75 else 76 print("trapBUS: no info\n"); 77 disfault(nil, "Bus error"); 78 } 79 80 static void 81 trapUSR1(int signo) 82 { 83 int intwait; 84 85 USED(signo); 86 87 intwait = up->intwait; 88 up->intwait = 0; /* clear it to let proc continue in osleave */ 89 90 if(up->type != Interp) /* Used to unblock pending I/O */ 91 return; 92 if(intwait == 0) /* Not posted so its a sync error */ 93 disfault(nil, Eintr); /* Should never happen */ 94 } 95 96 static void 97 trapUSR2(int signo) 98 { 99 USED(signo); 100 /* we've done our work of interrupting sigsuspend */ 101 } 102 103 static void 104 trapILL(int signo) 105 { 106 disfault(nil, "Illegal instruction"); 107 } 108 109 static void 110 trapSEGV(int signo) 111 { 112 disfault(nil, "Segmentation violation"); 113 } 114 115 static void 116 trapFPE(int signo) 117 { 118 119 char buf[64]; 120 USED(signo); 121 snprint(buf, sizeof(buf), "sys: fp: exception status=%.4lux", getfsr()); 122 disfault(nil, buf); 123 } 124 125 static sigset_t initmask; 126 127 static void 128 setsigs(void) 129 { 130 struct sigaction act; 131 sigset_t mask; 132 133 memset(&act, 0 , sizeof(act)); 134 sigemptyset(&initmask); 135 136 signal(SIGPIPE, SIG_IGN); /* prevent signal when devcmd child exits */ 137 if(signal(SIGTERM, SIG_IGN) != SIG_IGN) 138 signal(SIGTERM, cleanexit); 139 140 act.sa_handler = trapUSR1; 141 act.sa_mask = initmask; 142 sigaction(SIGUSR1, &act, nil); 143 144 act.sa_handler = trapUSR2; 145 sigaction(SIGUSR2, &act, nil); 146 sigemptyset(&mask); 147 sigaddset(&mask, SIGUSR2); 148 sigaddset(&initmask, SIGUSR2); 149 sigprocmask(SIG_BLOCK, &mask, NULL); 150 151 /* 152 * prevent Zombies forming when any process terminates 153 */ 154 act.sa_sigaction = 0; 155 act.sa_flags |= SA_NOCLDWAIT; 156 if(sigaction(SIGCHLD, &act, nil)) 157 panic("sigaction SIGCHLD"); 158 159 if(sflag == 0) { 160 act.sa_sigaction = trapBUS; 161 act.sa_flags |= SA_SIGINFO; 162 if(sigaction(SIGBUS, &act, nil)) 163 panic("sigaction SIGBUS"); 164 act.sa_handler = trapILL; 165 if(sigaction(SIGILL, &act, nil)) 166 panic("sigaction SIGBUS"); 167 act.sa_handler = trapSEGV; 168 if(sigaction(SIGSEGV, &act, nil)) 169 panic("sigaction SIGSEGV"); 170 act.sa_handler = trapFPE; 171 if(sigaction(SIGFPE, &act, nil)) 172 panic("sigaction SIGFPE"); 173 if(sigaddset(&initmask, SIGINT) == -1) 174 panic("sigaddset"); 175 } 176 if(sigprocmask(SIG_BLOCK, &initmask, nil)!= 0) 177 panic("sigprocmask"); 178 } 179 180 static int 181 tramp(void *arg) 182 { 183 Proc *p; 184 185 p = arg; 186 p->pid = p->sigid = getpid(); 187 sigprocmask(SIG_BLOCK, &initmask, nil); /* in 5.3, rfork_thread doesn't copy from parent, contrary to docs? */ 188 (*p->func)(p->arg); 189 pexit("{Tramp}", 0); 190 _exit(0); 191 } 192 193 int 194 kproc(char *name, void (*func)(void*), void *arg, int flags) 195 { 196 Proc *p; 197 Pgrp *pg; 198 Fgrp *fg; 199 Egrp *eg; 200 int pid; 201 void *tos; 202 203 p = newproc(); 204 205 if(flags & KPDUPPG) { 206 pg = up->env->pgrp; 207 incref(&pg->r); 208 p->env->pgrp = pg; 209 } 210 if(flags & KPDUPFDG) { 211 fg = up->env->fgrp; 212 incref(&fg->r); 213 p->env->fgrp = fg; 214 } 215 if(flags & KPDUPENVG) { 216 eg = up->env->egrp; 217 incref(&eg->r); 218 p->env->egrp = eg; 219 } 220 221 p->env->uid = up->env->uid; 222 p->env->gid = up->env->gid; 223 kstrdup(&p->env->user, up->env->user); 224 225 strcpy(p->text, name); 226 227 p->func = func; 228 p->arg = arg; 229 230 lock(&procs.l); 231 if(procs.tail != nil) { 232 p->prev = procs.tail; 233 procs.tail->next = p; 234 } 235 else { 236 procs.head = p; 237 p->prev = nil; 238 } 239 procs.tail = p; 240 unlock(&procs.l); 241 242 if(flags & KPX11){ 243 p->kstack = nil; /* never freed; also up not defined */ 244 tos = (char*)mallocz(X11STACK, 0) + X11STACK - sizeof(void*); 245 }else 246 p->kstack = stackalloc(p, &tos); 247 pid = rfork_thread(RFPROC|RFMEM|RFNOWAIT, tos, tramp, p); 248 if(pid < 0) 249 panic("ourfork"); 250 251 return pid; 252 253 } 254 255 void 256 oshostintr(Proc *p) 257 { 258 kill(p->sigid, SIGUSR1); 259 } 260 261 void 262 osblock(void) 263 { 264 sigset_t mask; 265 266 sigprocmask(SIG_SETMASK, NULL, &mask); 267 sigdelset(&mask, SIGUSR2); 268 sigsuspend(&mask); 269 } 270 271 void 272 osready(Proc *p) 273 { 274 if(kill(p->sigid, SIGUSR2) < 0) 275 fprint(2, "emu: osready failed: pid %d: %s\n", p->sigid, strerror(errno)); 276 } 277 278 void 279 oslongjmp(void *regs, osjmpbuf env, int val) 280 { 281 USED(regs); 282 siglongjmp(env, val); 283 } 284 285 struct termios tinit; 286 287 static void 288 termset(void) 289 { 290 struct termios t; 291 292 tcgetattr(0, &t); 293 tinit = t; 294 t.c_lflag &= ~(ICANON|ECHO|ISIG); 295 t.c_cc[VMIN] = 1; 296 t.c_cc[VTIME] = 0; 297 tcsetattr(0, TCSANOW, &t); 298 } 299 300 static void 301 termrestore(void) 302 { 303 tcsetattr(0, TCSANOW, &tinit); 304 } 305 306 void 307 cleanexit(int x) 308 { 309 USED(x); 310 311 if(up->intwait) { 312 up->intwait = 0; 313 return; 314 } 315 316 if(dflag == 0) 317 termrestore(); 318 319 kill(0, SIGKILL); 320 exit(0); 321 } 322 323 void 324 osreboot(char *file, char **argv) 325 { 326 if(dflag == 0) 327 termrestore(); 328 execvp(file, argv); 329 panic("reboot failure"); 330 } 331 332 int gidnobody= -1, uidnobody= -1; 333 334 void 335 getnobody() 336 { 337 struct passwd *pwd; 338 339 if(pwd = getpwnam("nobody")) { 340 uidnobody = pwd->pw_uid; 341 gidnobody = pwd->pw_gid; 342 } 343 } 344 345 void 346 libinit(char *imod) 347 { 348 struct passwd *pw; 349 Proc *p; 350 void *tos; 351 char sys[64]; 352 353 setsid(); 354 355 gethostname(sys, sizeof(sys)); 356 kstrdup(&ossysname, sys); 357 getnobody(); 358 359 if(dflag == 0) 360 termset(); 361 362 setsigs(); 363 364 p = newproc(); 365 p->kstack = stackalloc(p, &tos); 366 367 pw = getpwuid(getuid()); 368 if(pw != nil) 369 kstrdup(&eve, pw->pw_name); 370 else 371 print("cannot getpwuid\n"); 372 373 p->env->uid = getuid(); 374 p->env->gid = getgid(); 375 376 executeonnewstack(tos, emuinit, imod); 377 } 378 379 int 380 readkbd(void) 381 { 382 int n; 383 char buf[1]; 384 385 n = read(0, buf, sizeof(buf)); 386 if(n < 0) 387 print("keyboard close (n=%d, %s)\n", n, strerror(errno)); 388 if(n <= 0) 389 pexit("keyboard thread", 0); 390 391 switch(buf[0]) { 392 case '\r': 393 buf[0] = '\n'; 394 break; 395 case DELETE: 396 cleanexit(0); 397 break; 398 } 399 return buf[0]; 400 } 401 402 /* 403 * Return an abitrary millisecond clock time 404 */ 405 long 406 osmillisec(void) 407 { 408 static long sec0 = 0, usec0; 409 struct timeval t; 410 411 if(gettimeofday(&t,(struct timezone*)0)<0) 412 return 0; 413 if(sec0==0) { 414 sec0 = t.tv_sec; 415 usec0 = t.tv_usec; 416 } 417 return (t.tv_sec-sec0)*1000+(t.tv_usec-usec0+500)/1000; 418 } 419 420 int 421 limbosleep(ulong milsec) 422 { 423 return osmillisleep(milsec); 424 } 425 426 /* 427 * Return the time since the epoch in nanoseconds and microseconds 428 * The epoch is defined at 1 Jan 1970 429 */ 430 vlong 431 osnsec(void) 432 { 433 struct timeval t; 434 435 gettimeofday(&t, nil); 436 return (vlong)t.tv_sec*1000000000L + t.tv_usec*1000; 437 } 438 439 vlong 440 osusectime(void) 441 { 442 struct timeval t; 443 444 gettimeofday(&t, nil); 445 return (vlong)t.tv_sec * 1000000 + t.tv_usec; 446 } 447 448 int 449 osmillisleep(ulong milsec) 450 { 451 struct timespec time; 452 453 time.tv_sec = milsec / 1000; 454 time.tv_nsec = (milsec % 1000) * 1000000; 455 nanosleep(&time, 0); 456 return 0; 457 } 458 459 void 460 osyield(void) 461 { 462 sched_yield(); 463 } 464 465 void 466 ospause(void) 467 { 468 for(;;) 469 pause(); 470 } 471 472 void 473 oslopri(void) 474 { 475 setpriority(PRIO_PROCESS, 0, getpriority(PRIO_PROCESS,0)+4); 476 } 477 478 static struct { 479 Lock l; 480 void *free; 481 } stacklist; 482 483 static void 484 _stackfree(void *stack) 485 { 486 *((void **)stack) = stacklist.free; 487 stacklist.free = stack; 488 } 489 490 static void 491 stackfreeandexit(void *stack) 492 { 493 lock(&stacklist.l); 494 _stackfree(stack); 495 unlockandexit(&stacklist.l.val); 496 } 497 498 static void * 499 stackalloc(Proc *p, void **tos) 500 { 501 void *rv; 502 lock(&stacklist.l); 503 if (stacklist.free == 0) { 504 int x; 505 /* 506 * obtain some more by using sbrk() 507 */ 508 void *more = sbrk(KSTACK * (NSTACKSPERALLOC + 1)); 509 if (more == 0) 510 panic("stackalloc: no more stacks"); 511 /* 512 * align to KSTACK 513 */ 514 more = (void *)((((unsigned long)more) + (KSTACK - 1)) & ~(KSTACK - 1)); 515 /* 516 * free all the new stacks onto the freelist 517 */ 518 for (x = 0; x < NSTACKSPERALLOC; x++) 519 _stackfree((char *)more + KSTACK * x); 520 } 521 rv = stacklist.free; 522 stacklist.free = *(void **)rv; 523 unlock(&stacklist.l); 524 *tos = rv + KSTACK - sizeof(void*); 525 *(Proc **)rv = p; 526 return rv; 527 } 528 529 int 530 segflush(void *a, ulong n) 531 { 532 USED(a); 533 USED(n); 534 return 0; 535 } 536