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