| 1 | #include <u.h> |
| 2 | #include <libc.h> |
| 3 | #include <ureg.h> |
| 4 | #include "dat.h" |
| 5 | #include "fns.h" |
| 6 | #include "linux.h" |
| 7 | |
| 8 | typedef struct Signal Signal; |
| 9 | typedef struct Action Action; |
| 10 | typedef struct Queue Queue; |
| 11 | typedef struct Timers Timers; |
| 12 | typedef struct Handlers Handlers; |
| 13 | typedef struct Private Private; |
| 14 | |
| 15 | struct Signal |
| 16 | { |
| 17 | Usiginfo; |
| 18 | Signal *next; |
| 19 | }; |
| 20 | |
| 21 | struct Action |
| 22 | { |
| 23 | void *handler; |
| 24 | int flags; |
| 25 | uvlong block; |
| 26 | }; |
| 27 | |
| 28 | struct Queue |
| 29 | { |
| 30 | Ref; |
| 31 | QLock; |
| 32 | |
| 33 | Signal *head; |
| 34 | Signal **tailp; |
| 35 | Signal *free; |
| 36 | Signal a[64]; |
| 37 | |
| 38 | Ufile *tty; |
| 39 | }; |
| 40 | |
| 41 | struct Timers |
| 42 | { |
| 43 | Ref; |
| 44 | struct { |
| 45 | vlong interval; |
| 46 | vlong expire; |
| 47 | } itimer[2]; |
| 48 | }; |
| 49 | |
| 50 | struct Handlers |
| 51 | { |
| 52 | Ref; |
| 53 | QLock; |
| 54 | Action a[SIGMAX-1]; |
| 55 | }; |
| 56 | |
| 57 | struct Private |
| 58 | { |
| 59 | Handlers *h; |
| 60 | Queue *q; |
| 61 | Timers *t; |
| 62 | |
| 63 | struct { |
| 64 | ulong sp; |
| 65 | ulong size; |
| 66 | } altstack; |
| 67 | |
| 68 | uvlong block; |
| 69 | |
| 70 | Urestart *freerestart; |
| 71 | }; |
| 72 | |
| 73 | enum |
| 74 | { |
| 75 | SIG_ERR = -1, |
| 76 | SIG_DFL = 0, |
| 77 | SIG_IGN = 1, |
| 78 | SIG_HOLD = 2, |
| 79 | }; |
| 80 | |
| 81 | enum |
| 82 | { |
| 83 | SA_NOCLDSTOP = 1, |
| 84 | SA_NOCLDWAIT = 2, |
| 85 | SA_SIGINFO = 4, |
| 86 | SA_ONSTACK = 0x08000000, |
| 87 | SA_RESTART = 0x10000000, |
| 88 | SA_NODEFER = 0x40000000, |
| 89 | SA_RESETHAND = 0x80000000, |
| 90 | }; |
| 91 | |
| 92 | enum |
| 93 | { |
| 94 | SS_ONSTACK = 1, |
| 95 | SS_DISABLE = 2, |
| 96 | }; |
| 97 | |
| 98 | #define MASK(sig) (1LL << ((sig)-1)) |
| 99 | |
| 100 | static void |
| 101 | nextsignal(uvlong rblock, int wait); |
| 102 | |
| 103 | static int |
| 104 | getsignal(Private *p, Usiginfo *pinfo, int wait); |
| 105 | |
| 106 | static void |
| 107 | initrestart(Uproc *proc) |
| 108 | { |
| 109 | Urestart *r; |
| 110 | |
| 111 | r = &proc->restart0; |
| 112 | r->syscall = nil; |
| 113 | r->link = nil; |
| 114 | proc->restart = r; |
| 115 | } |
| 116 | |
| 117 | static void |
| 118 | poprestart(Private *p) |
| 119 | { |
| 120 | Urestart *r; |
| 121 | |
| 122 | for(;;){ |
| 123 | r = current->restart; |
| 124 | if(r->link==nil || r->syscall) |
| 125 | break; |
| 126 | current->restart = r->link; |
| 127 | |
| 128 | r->link = p->freerestart; |
| 129 | p->freerestart = r; |
| 130 | } |
| 131 | if(r->syscall) |
| 132 | current->syscall = r->syscall; |
| 133 | } |
| 134 | |
| 135 | static Queue* |
| 136 | mkqueue(void) |
| 137 | { |
| 138 | Queue *q; |
| 139 | int i; |
| 140 | |
| 141 | q = kmallocz(sizeof(Queue), 1); |
| 142 | q->ref = 1; |
| 143 | q->head = nil; |
| 144 | q->tailp = &q->head; |
| 145 | for(i=0; i<nelem(q->a); i++) |
| 146 | q->a[i].next = (i+1 == nelem(q->a)) ? nil : &q->a[i+1]; |
| 147 | q->free = q->a; |
| 148 | |
| 149 | return q; |
| 150 | } |
| 151 | |
| 152 | static Handlers* |
| 153 | mkhandlers(void) |
| 154 | { |
| 155 | Handlers *h; |
| 156 | int i; |
| 157 | |
| 158 | h = kmallocz(sizeof(Handlers), 1); |
| 159 | h->ref = 1; |
| 160 | for(i=1; i<SIGMAX; i++) |
| 161 | h->a[i-1].handler = (void*)SIG_DFL; |
| 162 | return h; |
| 163 | } |
| 164 | |
| 165 | static Timers* |
| 166 | mktimers(void) |
| 167 | { |
| 168 | Timers *t; |
| 169 | |
| 170 | t = kmallocz(sizeof(Timers), 1); |
| 171 | t->ref = 1; |
| 172 | return t; |
| 173 | } |
| 174 | |
| 175 | /* bits.s */ |
| 176 | extern int get_ds(void); |
| 177 | extern int get_cs(void); |
| 178 | static ulong user_cs, user_ds; |
| 179 | |
| 180 | void initsignal(void) |
| 181 | { |
| 182 | Private *p; |
| 183 | |
| 184 | if(user_ds==0 && user_cs==0){ |
| 185 | user_ds = get_ds(); |
| 186 | user_cs = get_cs(); |
| 187 | } |
| 188 | |
| 189 | p = kmallocz(sizeof(*p), 1); |
| 190 | p->block = 0; |
| 191 | |
| 192 | p->q = mkqueue(); |
| 193 | p->h = mkhandlers(); |
| 194 | p->t = mktimers(); |
| 195 | |
| 196 | current->signal = p; |
| 197 | initrestart(current); |
| 198 | } |
| 199 | |
| 200 | void exitsignal(void) |
| 201 | { |
| 202 | Private *p; |
| 203 | Queue *q; |
| 204 | Timers *t; |
| 205 | Signal **i; |
| 206 | Handlers *h; |
| 207 | Urestart *r; |
| 208 | |
| 209 | if((p = current->signal) == nil) |
| 210 | return; |
| 211 | current->signal = nil; |
| 212 | q = p->q; |
| 213 | qlock(q); |
| 214 | again: |
| 215 | for(i=&q->head; *i; i=&((*i)->next)){ |
| 216 | Signal *r; |
| 217 | r = *i; |
| 218 | if(!r->group && (r->topid == current->tid)){ |
| 219 | if((*i = r->next) == nil) |
| 220 | q->tailp = i; |
| 221 | r->next = q->free; |
| 222 | q->free = r; |
| 223 | goto again; |
| 224 | } |
| 225 | } |
| 226 | qunlock(q); |
| 227 | if(!decref(q)){ |
| 228 | putfile(q->tty); |
| 229 | q->tty = nil; |
| 230 | free(q); |
| 231 | } |
| 232 | h = p->h; |
| 233 | if(!decref(h)) |
| 234 | free(h); |
| 235 | t = p->t; |
| 236 | if(!decref(t)) |
| 237 | free(t); |
| 238 | while(r = current->restart){ |
| 239 | if(r->link == nil) |
| 240 | break; |
| 241 | current->restart = r->link; |
| 242 | r->link = p->freerestart; |
| 243 | p->freerestart = r; |
| 244 | } |
| 245 | current->restart = nil; |
| 246 | while(r = p->freerestart){ |
| 247 | p->freerestart = r->link; |
| 248 | free(r); |
| 249 | } |
| 250 | free(p); |
| 251 | } |
| 252 | |
| 253 | void clonesignal(Uproc *new, int copyhand, int newproc) |
| 254 | { |
| 255 | Private *p, *n; |
| 256 | |
| 257 | if((p = current->signal) == nil) |
| 258 | return; |
| 259 | |
| 260 | n = kmallocz(sizeof(*n), 1); |
| 261 | if(copyhand){ |
| 262 | n->h = mkhandlers(); |
| 263 | |
| 264 | qlock(p->h); |
| 265 | memmove(n->h->a, p->h->a, sizeof(n->h->a)); |
| 266 | qunlock(p->h); |
| 267 | } else { |
| 268 | incref(p->h); |
| 269 | n->h = p->h; |
| 270 | } |
| 271 | |
| 272 | qlock(p->q); |
| 273 | if(newproc){ |
| 274 | n->q = mkqueue(); |
| 275 | n->q->tty = getfile(p->q->tty); |
| 276 | n->t = mktimers(); |
| 277 | n->altstack = p->altstack; |
| 278 | } else { |
| 279 | incref(p->q); |
| 280 | n->q = p->q; |
| 281 | incref(p->t); |
| 282 | n->t = p->t; |
| 283 | } |
| 284 | qunlock(p->q); |
| 285 | |
| 286 | n->block = p->block; |
| 287 | new->signal = n; |
| 288 | |
| 289 | initrestart(new); |
| 290 | } |
| 291 | |
| 292 | void |
| 293 | settty(Ufile *tty) |
| 294 | { |
| 295 | Private *p; |
| 296 | Ufile *old; |
| 297 | |
| 298 | if((p = current->signal) == nil) |
| 299 | return; |
| 300 | tty = getfile(tty); |
| 301 | qlock(p->q); |
| 302 | old = p->q->tty; |
| 303 | p->q->tty = tty; |
| 304 | qunlock(p->q); |
| 305 | putfile(old); |
| 306 | } |
| 307 | |
| 308 | Ufile* |
| 309 | gettty(void) |
| 310 | { |
| 311 | Private *p; |
| 312 | Ufile *tty; |
| 313 | |
| 314 | if((p = current->signal) == nil) |
| 315 | return nil; |
| 316 | qlock(p->q); |
| 317 | tty = getfile(p->q->tty); |
| 318 | qunlock(p->q); |
| 319 | return tty; |
| 320 | } |
| 321 | |
| 322 | int ignoressignal(Uproc *proc, int sig) |
| 323 | { |
| 324 | Private *p; |
| 325 | int a, f; |
| 326 | |
| 327 | if((p = proc->signal) == nil) |
| 328 | return 1; |
| 329 | qlock(p->h); |
| 330 | a = (int)p->h->a[sig-1].handler; |
| 331 | f = p->h->a[sig-1].flags; |
| 332 | qunlock(p->h); |
| 333 | switch(sig){ |
| 334 | case SIGKILL: |
| 335 | case SIGSTOP: |
| 336 | return 0; |
| 337 | case SIGCHLD: |
| 338 | if(f & SA_NOCLDWAIT) |
| 339 | return 1; |
| 340 | break; |
| 341 | case SIGWINCH: |
| 342 | case SIGURG: |
| 343 | if(a == SIG_DFL) |
| 344 | return 1; |
| 345 | } |
| 346 | return (a == SIG_IGN); |
| 347 | } |
| 348 | |
| 349 | int wantssignal(Uproc *proc, int sig) |
| 350 | { |
| 351 | Private *p; |
| 352 | |
| 353 | p = proc->signal; |
| 354 | if(p == nil || p->block & MASK(sig)) |
| 355 | return 0; |
| 356 | return !ignoressignal(proc, sig); |
| 357 | } |
| 358 | |
| 359 | int sendsignal(Uproc *proc, Usiginfo *info, int group) |
| 360 | { |
| 361 | Private *p; |
| 362 | Signal *s; |
| 363 | |
| 364 | trace("sendsignal(%S) to %d from %d", |
| 365 | info->signo, proc->tid, (current != nil) ? current->tid : 0); |
| 366 | |
| 367 | if(ignoressignal(proc, info->signo)){ |
| 368 | trace("sendsignal(): ignored signal %S", info->signo); |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | p = proc->signal; |
| 373 | qlock(p->q); |
| 374 | if(info->signo < SIGRT1){ |
| 375 | for(s=p->q->head; s; s=s->next){ |
| 376 | if(!s->group && (s->topid != proc->tid)) |
| 377 | continue; |
| 378 | if(s->signo == info->signo){ |
| 379 | qunlock(p->q); |
| 380 | trace("sendsignal(): droping follow up signal %S", info->signo); |
| 381 | return 0; |
| 382 | } |
| 383 | } |
| 384 | } |
| 385 | if((s = p->q->free) == nil){ |
| 386 | qunlock(p->q); |
| 387 | trace("sendsignal(): out of signal buffers"); |
| 388 | return -EAGAIN; |
| 389 | } |
| 390 | p->q->free = s->next; |
| 391 | s->next = nil; |
| 392 | memmove(s, info, sizeof(*info)); |
| 393 | s->group = group; |
| 394 | s->topid = group ? proc->pid : proc->tid; |
| 395 | *p->q->tailp = s; |
| 396 | p->q->tailp = &s->next; |
| 397 | qunlock(p->q); |
| 398 | return 1; |
| 399 | } |
| 400 | |
| 401 | int |
| 402 | signalspending(Uproc *proc) |
| 403 | { |
| 404 | Private *p; |
| 405 | Signal *s; |
| 406 | int ret; |
| 407 | |
| 408 | p = proc->signal; |
| 409 | if(p == nil || p->q->head == nil) |
| 410 | return 0; |
| 411 | |
| 412 | ret = 0; |
| 413 | qlock(p->q); |
| 414 | for(s=p->q->head; s; s=s->next){ |
| 415 | if(!s->group && (s->topid != current->tid)) |
| 416 | continue; |
| 417 | if(MASK(s->signo) & p->block) |
| 418 | continue; |
| 419 | ret = 1; |
| 420 | break; |
| 421 | } |
| 422 | qunlock(p->q); |
| 423 | |
| 424 | return ret; |
| 425 | } |
| 426 | |
| 427 | static int |
| 428 | getsignal(Private *p, Usiginfo *pinfo, int wait) |
| 429 | { |
| 430 | Signal *r; |
| 431 | Signal **i; |
| 432 | int sig; |
| 433 | |
| 434 | if(!wait && p->q->head == nil) |
| 435 | return 0; |
| 436 | |
| 437 | sig = 0; |
| 438 | qlock(p->q); |
| 439 | for(;;){ |
| 440 | for(i=&p->q->head; *i; i=&((*i)->next)){ |
| 441 | r = *i; |
| 442 | |
| 443 | if(!r->group && (r->topid != current->tid)) |
| 444 | continue; |
| 445 | |
| 446 | if(p->block & MASK(r->signo)){ |
| 447 | if(sig == 0) |
| 448 | sig = -r->signo; |
| 449 | continue; |
| 450 | } |
| 451 | sig = r->signo; |
| 452 | |
| 453 | /* dequeue nonblocked signal */ |
| 454 | memmove(pinfo, r, sizeof(*pinfo)); |
| 455 | if((*i = r->next) == nil) |
| 456 | p->q->tailp = i; |
| 457 | r->next = p->q->free; |
| 458 | p->q->free = r; |
| 459 | break; |
| 460 | } |
| 461 | if(wait && sig <= 0){ |
| 462 | if(sleepproc(p->q, 0) == 0) |
| 463 | continue; |
| 464 | } |
| 465 | break; |
| 466 | } |
| 467 | qunlock(p->q); |
| 468 | |
| 469 | return sig; |
| 470 | } |
| 471 | |
| 472 | static uvlong |
| 473 | sigset2uvlong(uchar *set, int setsize) |
| 474 | { |
| 475 | uvlong r; |
| 476 | int i; |
| 477 | |
| 478 | r = 0; |
| 479 | if(setsize > sizeof(uvlong)) |
| 480 | setsize = sizeof(uvlong); |
| 481 | for(i=0; i<setsize; i++) |
| 482 | r |= (uvlong)set[i] << (i * 8); |
| 483 | return r; |
| 484 | } |
| 485 | |
| 486 | static void |
| 487 | uvlong2sigset(uchar *set, int setsize, uvlong mask) |
| 488 | { |
| 489 | int i; |
| 490 | |
| 491 | for(i=0; i<setsize; i++){ |
| 492 | if(i < sizeof(uvlong)){ |
| 493 | set[i] = ((mask >> (i*8)) & 0xff); |
| 494 | } else { |
| 495 | set[i] = 0; |
| 496 | } |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | struct linux_siginfo { |
| 501 | int signo; |
| 502 | int errno; |
| 503 | int code; |
| 504 | |
| 505 | union { |
| 506 | int _pad[29]; |
| 507 | |
| 508 | /* kill() */ |
| 509 | struct { |
| 510 | int pid; /* sender's pid */ |
| 511 | int uid; /* sender's uid */ |
| 512 | } kill; |
| 513 | |
| 514 | /* POSIX.1b timers */ |
| 515 | struct { |
| 516 | int tid; /* timer id */ |
| 517 | int overrun; /* overrun count */ |
| 518 | int val; /* same as below */ |
| 519 | } timer; |
| 520 | |
| 521 | /* POSIX.1b signals */ |
| 522 | struct { |
| 523 | int pid; /* sender's pid */ |
| 524 | int uid; /* sender's uid */ |
| 525 | int val; |
| 526 | } rt; |
| 527 | |
| 528 | /* SIGCHLD */ |
| 529 | struct { |
| 530 | int pid; /* which child */ |
| 531 | int uid; /* sender's uid */ |
| 532 | int status; /* exit code */ |
| 533 | long utime; |
| 534 | long stime; |
| 535 | } chld; |
| 536 | |
| 537 | /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ |
| 538 | struct { |
| 539 | void *addr; /* faulting insn/memory ref. */ |
| 540 | int trapno; /* TRAP # which caused the signal */ |
| 541 | } fault; |
| 542 | |
| 543 | /* SIGPOLL */ |
| 544 | struct { |
| 545 | long band; /* POLL_IN, POLL_OUT, POLL_MSG */ |
| 546 | int fd; |
| 547 | } poll; |
| 548 | }; |
| 549 | }; |
| 550 | |
| 551 | void |
| 552 | siginfo2linux(Usiginfo *info, void *p) |
| 553 | { |
| 554 | struct linux_siginfo *li = p; |
| 555 | int sig; |
| 556 | |
| 557 | sig = info->signo; |
| 558 | |
| 559 | li->signo = sig; |
| 560 | li->errno = info->errno; |
| 561 | li->code = info->code; |
| 562 | |
| 563 | switch(sig){ |
| 564 | case SIGALRM: |
| 565 | li->timer.tid = info->timer.tid; |
| 566 | li->timer.overrun = info->timer.overrun; |
| 567 | li->timer.val = info->timer.val; |
| 568 | break; |
| 569 | case SIGCHLD: |
| 570 | li->chld.pid = info->chld.pid; |
| 571 | li->chld.uid = info->chld.uid; |
| 572 | li->chld.status = info->chld.status; |
| 573 | li->chld.utime = info->chld.utime; |
| 574 | li->chld.stime = info->chld.stime; |
| 575 | break; |
| 576 | case SIGILL: |
| 577 | case SIGBUS: |
| 578 | case SIGFPE: |
| 579 | case SIGSEGV: |
| 580 | li->fault.addr = info->fault.addr; |
| 581 | li->fault.trapno = info->fault.trapno; |
| 582 | break; |
| 583 | case SIGPOLL: |
| 584 | li->poll.fd = info->poll.fd; |
| 585 | li->poll.band = info->poll.band; |
| 586 | break; |
| 587 | case SIGRT1: |
| 588 | case SIGRT2: |
| 589 | case SIGRT3: |
| 590 | case SIGRT4: |
| 591 | case SIGRT5: |
| 592 | case SIGRT6: |
| 593 | case SIGRT7: |
| 594 | case SIGRT8: |
| 595 | li->rt.pid = info->rt.pid; |
| 596 | li->rt.uid = info->rt.uid; |
| 597 | li->rt.val = info->rt.val; |
| 598 | break; |
| 599 | default: |
| 600 | li->kill.pid = info->kill.pid; |
| 601 | li->kill.uid = info->kill.uid; |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | void |
| 606 | linux2siginfo(void *p, Usiginfo *info) |
| 607 | { |
| 608 | struct linux_siginfo *li = p; |
| 609 | int sig; |
| 610 | |
| 611 | sig = li->signo; |
| 612 | |
| 613 | info->signo = sig; |
| 614 | info->errno = li->errno; |
| 615 | info->code = li->code; |
| 616 | |
| 617 | switch(sig){ |
| 618 | case SIGALRM: |
| 619 | info->timer.tid = li->timer.tid; |
| 620 | info->timer.overrun = li->timer.overrun; |
| 621 | info->timer.val = li->timer.val; |
| 622 | break; |
| 623 | case SIGCHLD: |
| 624 | info->chld.pid = li->chld.pid; |
| 625 | info->chld.uid = li->chld.uid; |
| 626 | info->chld.status = li->chld.status; |
| 627 | info->chld.utime = li->chld.utime; |
| 628 | info->chld.stime = li->chld.stime; |
| 629 | break; |
| 630 | case SIGILL: |
| 631 | case SIGBUS: |
| 632 | case SIGFPE: |
| 633 | case SIGSEGV: |
| 634 | info->fault.addr = li->fault.addr; |
| 635 | info->fault.trapno = li->fault.trapno; |
| 636 | break; |
| 637 | case SIGPOLL: |
| 638 | info->poll.fd = li->poll.fd; |
| 639 | info->poll.band = li->poll.band; |
| 640 | break; |
| 641 | case SIGRT1: |
| 642 | case SIGRT2: |
| 643 | case SIGRT3: |
| 644 | case SIGRT4: |
| 645 | case SIGRT5: |
| 646 | case SIGRT6: |
| 647 | case SIGRT7: |
| 648 | case SIGRT8: |
| 649 | info->rt.pid = li->rt.pid; |
| 650 | info->rt.uid = li->rt.uid; |
| 651 | info->rt.val = li->rt.val; |
| 652 | break; |
| 653 | default: |
| 654 | info->kill.pid = li->kill.pid; |
| 655 | info->kill.uid = li->kill.uid; |
| 656 | } |
| 657 | } |
| 658 | |
| 659 | struct linux_sigcontext { |
| 660 | ulong gs; |
| 661 | ulong fs; |
| 662 | ulong es; |
| 663 | ulong ds; |
| 664 | ulong di; |
| 665 | ulong si; |
| 666 | ulong bp; |
| 667 | ulong sp; |
| 668 | ulong bx; |
| 669 | ulong dx; |
| 670 | ulong cx; |
| 671 | ulong ax; |
| 672 | ulong trapno; |
| 673 | ulong err; |
| 674 | ulong ip; |
| 675 | ulong cs; |
| 676 | ulong flags; |
| 677 | ulong sp_at_signal; |
| 678 | ulong ss; |
| 679 | void* fpstate; |
| 680 | ulong oldmask; |
| 681 | ulong cr2; |
| 682 | }; |
| 683 | |
| 684 | static void |
| 685 | ureg2linuxsigcontext(Ureg *u, struct linux_sigcontext *sc) |
| 686 | { |
| 687 | sc->gs = u->gs; |
| 688 | sc->fs = u->fs; |
| 689 | sc->es = u->es; |
| 690 | sc->ds = u->ds; |
| 691 | sc->di = u->di; |
| 692 | sc->si = u->si; |
| 693 | sc->bp = u->bp; |
| 694 | sc->sp = u->sp; |
| 695 | sc->bx = u->bx; |
| 696 | sc->dx = u->dx; |
| 697 | sc->cx = u->cx; |
| 698 | sc->ax = u->ax; |
| 699 | sc->trapno = u->trap; |
| 700 | sc->err = u->ecode; |
| 701 | sc->ip = u->pc; |
| 702 | sc->cs = u->cs; |
| 703 | sc->flags = u->flags; |
| 704 | sc->sp_at_signal = u->sp; |
| 705 | sc->ss = u->ss; |
| 706 | sc->cr2 = 0; |
| 707 | } |
| 708 | |
| 709 | struct linux_sigset { |
| 710 | ulong sig[2]; |
| 711 | }; |
| 712 | |
| 713 | struct linux_signalstack { |
| 714 | ulong sp; |
| 715 | int flags; |
| 716 | ulong size; |
| 717 | }; |
| 718 | |
| 719 | struct linux_ucontext { |
| 720 | ulong flags; |
| 721 | struct linux_ucontext *link; |
| 722 | struct linux_signalstack stack; |
| 723 | struct linux_sigcontext context; |
| 724 | struct linux_sigset sigmask; |
| 725 | }; |
| 726 | |
| 727 | static void |
| 728 | linuxsigcontext2ureg(struct linux_sigcontext *sc, Ureg *u) |
| 729 | { |
| 730 | u->pc = sc->ip; |
| 731 | u->sp = sc->sp; |
| 732 | u->ax = sc->ax; |
| 733 | u->bx = sc->bx; |
| 734 | u->cx = sc->cx; |
| 735 | u->dx = sc->dx; |
| 736 | u->di = sc->di; |
| 737 | u->si = sc->si; |
| 738 | u->bp = sc->bp; |
| 739 | |
| 740 | u->cs = sc->cs; |
| 741 | u->ss = sc->ss; |
| 742 | u->ds = sc->ds; |
| 743 | u->es = sc->es; |
| 744 | u->fs = sc->fs; |
| 745 | u->gs = sc->gs; |
| 746 | } |
| 747 | |
| 748 | struct linux_sigframe { |
| 749 | void *ret; |
| 750 | int sig; |
| 751 | |
| 752 | union { |
| 753 | struct linux_sigcontext sc; |
| 754 | |
| 755 | struct { |
| 756 | struct linux_siginfo *pinfo; |
| 757 | struct linux_ucontext *puc; |
| 758 | |
| 759 | struct linux_siginfo info; |
| 760 | struct linux_ucontext uc; |
| 761 | } rt; |
| 762 | }; |
| 763 | }; |
| 764 | |
| 765 | #pragma profile off |
| 766 | |
| 767 | static int |
| 768 | linuxstackflags(Private *p, ulong sp) |
| 769 | { |
| 770 | if(p->altstack.size == 0 || p->altstack.sp == 0) |
| 771 | return SS_DISABLE; |
| 772 | if(sp - p->altstack.sp < p->altstack.size) |
| 773 | return SS_ONSTACK; |
| 774 | return 0; |
| 775 | } |
| 776 | |
| 777 | static void |
| 778 | linuxsignal(Private *p, Action *a, Usiginfo *i, uvlong rblock) |
| 779 | { |
| 780 | struct linux_sigframe _frame; |
| 781 | struct linux_sigframe *f; |
| 782 | Ureg *u; |
| 783 | int stackflags; |
| 784 | |
| 785 | u = current->ureg; |
| 786 | |
| 787 | stackflags = linuxstackflags(p, u->sp); |
| 788 | if((a->flags & SA_ONSTACK) && (stackflags == 0)){ |
| 789 | trace("linuxsignal: altstack %lux %lux", p->altstack.sp, p->altstack.size); |
| 790 | f = (struct linux_sigframe*)(p->altstack.sp + p->altstack.size); |
| 791 | f--; |
| 792 | } else { |
| 793 | f = &_frame; |
| 794 | } |
| 795 | |
| 796 | trace("linuxsignal(): frame %p", f); |
| 797 | memset(f, 0, sizeof(*f)); |
| 798 | |
| 799 | f->sig = i->signo; |
| 800 | |
| 801 | if(a->flags & SA_SIGINFO){ |
| 802 | f->ret = linux_rtsigreturn; |
| 803 | siginfo2linux(i, &f->rt.info); |
| 804 | f->rt.pinfo = &f->rt.info; |
| 805 | |
| 806 | f->rt.uc.stack.sp = p->altstack.sp; |
| 807 | f->rt.uc.stack.size = p->altstack.size; |
| 808 | f->rt.uc.stack.flags = stackflags; |
| 809 | |
| 810 | ureg2linuxsigcontext(u, &f->rt.uc.context); |
| 811 | f->rt.uc.context.oldmask = rblock & 0xFFFFFFFF; |
| 812 | f->rt.uc.sigmask.sig[0] = rblock & 0xFFFFFFFF; |
| 813 | f->rt.uc.sigmask.sig[1] = (rblock >> 32) & 0xFFFFFFFF; |
| 814 | f->rt.puc = &f->rt.uc; |
| 815 | u->cx = (ulong)f->rt.puc; |
| 816 | u->dx = (ulong)f->rt.pinfo; |
| 817 | } else { |
| 818 | f->ret = linux_sigreturn; |
| 819 | ureg2linuxsigcontext(u, &f->sc); |
| 820 | f->sc.oldmask = rblock & 0xFFFFFFFF; |
| 821 | u->cx = 0; |
| 822 | u->dx = 0; |
| 823 | } |
| 824 | |
| 825 | u->di = 0; |
| 826 | u->si = 0; |
| 827 | u->bp = 0; |
| 828 | u->bx = 0; |
| 829 | |
| 830 | u->ax = (ulong)i->signo; |
| 831 | |
| 832 | u->sp = (ulong)f; |
| 833 | u->pc = (ulong)a->handler; |
| 834 | |
| 835 | u->cs = user_cs; |
| 836 | u->ss = user_ds; |
| 837 | u->ds = user_ds; |
| 838 | u->es = user_ds; |
| 839 | |
| 840 | p->block |= a->block; |
| 841 | |
| 842 | trace("linuxsignal(): retuser pc=%lux sp=%lux", u->pc, u->sp); |
| 843 | retuser(); |
| 844 | } |
| 845 | |
| 846 | int |
| 847 | sys_sigreturn(void) |
| 848 | { |
| 849 | struct linux_sigframe *f; |
| 850 | Private *p; |
| 851 | Ureg *u; |
| 852 | |
| 853 | trace("sys_sigreturn()"); |
| 854 | |
| 855 | p = current->signal; |
| 856 | u = current->ureg; |
| 857 | |
| 858 | f = (struct linux_sigframe*)(u->sp - 4); |
| 859 | |
| 860 | trace("sys_sigreturn(): frame %p", f); |
| 861 | |
| 862 | linuxsigcontext2ureg(&f->sc, u); |
| 863 | p->block &= ~0xFFFFFFFF; |
| 864 | p->block |= f->sc.oldmask; |
| 865 | nextsignal(p->block, 0); |
| 866 | poprestart(p); |
| 867 | |
| 868 | trace("sys_sigreturn(): retuser pc=%lux sp=%lux", u->pc, u->sp); |
| 869 | retuser(); |
| 870 | |
| 871 | return -1; |
| 872 | } |
| 873 | |
| 874 | int |
| 875 | sys_rt_sigreturn(void) |
| 876 | { |
| 877 | struct linux_sigframe *f; |
| 878 | Private *p; |
| 879 | Ureg *u; |
| 880 | |
| 881 | trace("sys_rt_sigreturn()"); |
| 882 | |
| 883 | p = current->signal; |
| 884 | u = current->ureg; |
| 885 | |
| 886 | f = (struct linux_sigframe*)(u->sp - 4); |
| 887 | trace("sys_rt_sigreturn(): frame %p", f); |
| 888 | |
| 889 | linuxsigcontext2ureg(&f->rt.uc.context, u); |
| 890 | p->block = (uvlong)f->rt.uc.sigmask.sig[0] | (uvlong)f->rt.uc.sigmask.sig[1]<<32; |
| 891 | nextsignal(p->block, 0); |
| 892 | poprestart(p); |
| 893 | |
| 894 | trace("sys_rt_sigreturn(): pc=%lux sp=%lux", u->pc, u->sp); |
| 895 | retuser(); |
| 896 | |
| 897 | return -1; |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * nextsignal transfers execution to the next pending |
| 902 | * signal or just returns. after the signal got executed, |
| 903 | * the block mask is restored to rblock. if heres no |
| 904 | * pending signal and wait is non zero the current |
| 905 | * process is suspended until here is a signal available. |
| 906 | */ |
| 907 | |
| 908 | static void |
| 909 | nextsignal(uvlong rblock, int wait) |
| 910 | { |
| 911 | Private *p; |
| 912 | int sig; |
| 913 | Usiginfo info; |
| 914 | Action a; |
| 915 | Urestart *r; |
| 916 | |
| 917 | for(;;){ |
| 918 | if((p = current->signal) == nil) |
| 919 | return; |
| 920 | |
| 921 | if(current->wstate & WSTOPPED){ |
| 922 | p->block = ~(MASK(SIGCONT) | MASK(SIGKILL)); |
| 923 | sig = getsignal(p, &info, 1); |
| 924 | p->block = rblock; |
| 925 | if(sig <= 0) |
| 926 | return; |
| 927 | if(sig == SIGCONT){ |
| 928 | contproc(current, sig, info.group); |
| 929 | continue; |
| 930 | } |
| 931 | } else { |
| 932 | if((sig = getsignal(p, &info, wait)) <= 0) |
| 933 | return; |
| 934 | if(sig == SIGCONT) |
| 935 | continue; |
| 936 | if(sig == SIGSTOP){ |
| 937 | stopproc(current, sig, info.group); |
| 938 | continue; |
| 939 | } |
| 940 | } |
| 941 | break; |
| 942 | } |
| 943 | |
| 944 | trace("nextsignal(): signal %S", sig); |
| 945 | |
| 946 | qlock(p->h); |
| 947 | a = p->h->a[sig-1]; |
| 948 | if(a.flags & SA_RESETHAND) |
| 949 | p->h->a[sig-1].handler = (void*)SIG_DFL; |
| 950 | if(a.flags & SA_NODEFER == 0) |
| 951 | a.block |= MASK(sig); |
| 952 | qunlock(p->h); |
| 953 | |
| 954 | switch((int)a.handler){ |
| 955 | case SIG_DFL: |
| 956 | switch(sig){ |
| 957 | case SIGCHLD: |
| 958 | case SIGWINCH: |
| 959 | case SIGURG: |
| 960 | goto Ignored; |
| 961 | } |
| 962 | /* no break */ |
| 963 | case SIG_ERR: |
| 964 | trace("nextsignal(): signal %S causes exit", sig); |
| 965 | exitproc(current, sig, 1); |
| 966 | Ignored: |
| 967 | case SIG_IGN: |
| 968 | case SIG_HOLD: |
| 969 | trace("nextsignal(): signal %S ignored", sig); |
| 970 | return; |
| 971 | } |
| 972 | |
| 973 | if(current->restart->syscall){ |
| 974 | if(a.flags & SA_RESTART){ |
| 975 | if(r = p->freerestart) |
| 976 | p->freerestart = r->link; |
| 977 | if(r == nil) |
| 978 | r = kmalloc(sizeof(*r)); |
| 979 | r->syscall = nil; |
| 980 | r->link = current->restart; |
| 981 | current->restart = r; |
| 982 | } else { |
| 983 | trace("nextsignal(): interrupting syscall %s", current->syscall); |
| 984 | current->sysret(-EINTR); |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | linuxsignal(p, &a, &info, rblock); |
| 989 | } |
| 990 | |
| 991 | void handlesignals(void) |
| 992 | { |
| 993 | Private *p; |
| 994 | |
| 995 | if(p = current->signal) |
| 996 | nextsignal(p->block, 0); |
| 997 | } |
| 998 | |
| 999 | int |
| 1000 | sys_rt_sigsuspend(uchar *set, int setsize) |
| 1001 | { |
| 1002 | Private *p; |
| 1003 | uvlong b, rblock; |
| 1004 | |
| 1005 | trace("sys_rt_sigsuspend(%p, %d)", set, setsize); |
| 1006 | |
| 1007 | p = current->signal; |
| 1008 | b = sigset2uvlong(set, setsize); |
| 1009 | b &= ~(MASK(SIGKILL) | MASK(SIGSTOP)); |
| 1010 | |
| 1011 | rblock = p->block; |
| 1012 | p->block = b; |
| 1013 | |
| 1014 | /* |
| 1015 | * if a signal got handled, it will pop out after the the |
| 1016 | * sigsuspend syscall with return value set to -EINTR |
| 1017 | */ |
| 1018 | current->sysret(-EINTR); |
| 1019 | |
| 1020 | for(;;) |
| 1021 | nextsignal(rblock, 1); |
| 1022 | } |
| 1023 | |
| 1024 | #pragma profile on |
| 1025 | |
| 1026 | struct linux_altstack |
| 1027 | { |
| 1028 | ulong sp; |
| 1029 | int flags; |
| 1030 | ulong size; |
| 1031 | }; |
| 1032 | |
| 1033 | int sys_sigaltstack(void *stk, void *ostk) |
| 1034 | { |
| 1035 | Private *p; |
| 1036 | struct linux_altstack *a = stk, *oa = ostk; |
| 1037 | int flags; |
| 1038 | ulong sp, size; |
| 1039 | |
| 1040 | trace("sys_sigaltstack(%lux, %lux)", (ulong)stk, (ulong)ostk); |
| 1041 | |
| 1042 | p = current->signal; |
| 1043 | sp = p->altstack.sp; |
| 1044 | size = p->altstack.size; |
| 1045 | flags = linuxstackflags(p, current->ureg->sp); |
| 1046 | |
| 1047 | if(a){ |
| 1048 | if(flags == SS_ONSTACK) |
| 1049 | return -EPERM; |
| 1050 | |
| 1051 | if(a->flags == SS_DISABLE){ |
| 1052 | p->altstack.sp = 0; |
| 1053 | p->altstack.size = 0; |
| 1054 | } else { |
| 1055 | p->altstack.sp = a->sp; |
| 1056 | p->altstack.size = a->size; |
| 1057 | } |
| 1058 | |
| 1059 | trace("sys_signalstack(): new altstack %lux-%lux", |
| 1060 | p->altstack.sp, p->altstack.sp + p->altstack.size); |
| 1061 | } |
| 1062 | if(oa){ |
| 1063 | oa->sp = sp; |
| 1064 | oa->size = size; |
| 1065 | oa->flags = flags; |
| 1066 | } |
| 1067 | |
| 1068 | return 0; |
| 1069 | } |
| 1070 | |
| 1071 | struct linux_sigaction |
| 1072 | { |
| 1073 | void *handler; |
| 1074 | ulong flags; |
| 1075 | void *restorer; |
| 1076 | uchar mask[]; |
| 1077 | }; |
| 1078 | |
| 1079 | int sys_rt_sigaction(int sig, void *pact, void *poact, int setsize) |
| 1080 | { |
| 1081 | Private *p; |
| 1082 | Action *a; |
| 1083 | struct linux_sigaction *act; |
| 1084 | struct linux_sigaction *oact; |
| 1085 | void *handler; |
| 1086 | int flags; |
| 1087 | uvlong block; |
| 1088 | |
| 1089 | trace("sys_rt_sigaction(%S, %p, %p, %d)", sig, pact, poact, setsize); |
| 1090 | |
| 1091 | p = current->signal; |
| 1092 | act = (struct linux_sigaction*)pact; |
| 1093 | oact = (struct linux_sigaction*)poact; |
| 1094 | |
| 1095 | if((sig < 1) || (sig >= SIGMAX)) |
| 1096 | return -EINVAL; |
| 1097 | |
| 1098 | qlock(p->h); |
| 1099 | a = &p->h->a[sig-1]; |
| 1100 | handler = a->handler; |
| 1101 | flags = a->flags; |
| 1102 | block = a->block; |
| 1103 | if(act){ |
| 1104 | trace("flags = %x", a->flags); |
| 1105 | a->handler = act->handler; |
| 1106 | a->flags = act->flags; |
| 1107 | a->block = sigset2uvlong(act->mask, setsize); |
| 1108 | } |
| 1109 | if(oact){ |
| 1110 | oact->handler = handler; |
| 1111 | oact->flags = flags; |
| 1112 | oact->restorer = 0; |
| 1113 | uvlong2sigset(oact->mask, setsize, block); |
| 1114 | } |
| 1115 | qunlock(p->h); |
| 1116 | |
| 1117 | return 0; |
| 1118 | } |
| 1119 | |
| 1120 | int sys_rt_sigpending(uchar *set, int setsize) |
| 1121 | { |
| 1122 | Private *p; |
| 1123 | Signal *s; |
| 1124 | uvlong m; |
| 1125 | |
| 1126 | trace("sys_rt_sigpending(%p, %d)", set, setsize); |
| 1127 | |
| 1128 | p = current->signal; |
| 1129 | m = 0LL; |
| 1130 | qlock(p->q); |
| 1131 | for(s=p->q->head; s; s=s->next){ |
| 1132 | if(!s->group && (s->topid != current->tid)) |
| 1133 | continue; |
| 1134 | m |= MASK(s->signo); |
| 1135 | } |
| 1136 | qunlock(p->q); |
| 1137 | |
| 1138 | uvlong2sigset(set, setsize, m); |
| 1139 | return 0; |
| 1140 | } |
| 1141 | |
| 1142 | enum |
| 1143 | { |
| 1144 | SIG_BLOCK = 0, |
| 1145 | SIG_UNBLOCK = 1, |
| 1146 | SIG_SETMASK = 2, |
| 1147 | }; |
| 1148 | |
| 1149 | int sys_rt_sigprocmask(int how, uchar *act, uchar *oact, int setsize) |
| 1150 | { |
| 1151 | Private *p; |
| 1152 | uvlong m, block; |
| 1153 | |
| 1154 | trace("sys_rt_sigprocmask(%d, %p, %p, %d)", how, act, oact, setsize); |
| 1155 | |
| 1156 | p = current->signal; |
| 1157 | block = p->block; |
| 1158 | if(act){ |
| 1159 | m = sigset2uvlong(act, setsize); |
| 1160 | m &= ~(MASK(SIGKILL) | MASK(SIGSTOP)); |
| 1161 | switch(how){ |
| 1162 | default: |
| 1163 | return -EINVAL; |
| 1164 | case SIG_BLOCK: |
| 1165 | p->block |= m; |
| 1166 | break; |
| 1167 | case SIG_UNBLOCK: |
| 1168 | p->block &= ~m; |
| 1169 | break; |
| 1170 | case SIG_SETMASK: |
| 1171 | p->block = m; |
| 1172 | break; |
| 1173 | } |
| 1174 | } |
| 1175 | if(oact) |
| 1176 | uvlong2sigset(oact, setsize, block); |
| 1177 | return 0; |
| 1178 | } |
| 1179 | |
| 1180 | struct linux_itimer |
| 1181 | { |
| 1182 | struct linux_timeval it_interval; |
| 1183 | struct linux_timeval it_value; |
| 1184 | }; |
| 1185 | |
| 1186 | static vlong |
| 1187 | hzround(vlong t) |
| 1188 | { |
| 1189 | vlong q = 1000000000LL/HZ; |
| 1190 | return (t + q-1) / q; |
| 1191 | } |
| 1192 | |
| 1193 | int sys_setitimer(int which, void *value, void *ovalue) |
| 1194 | { |
| 1195 | Private *p; |
| 1196 | Timers *t; |
| 1197 | vlong now, rem, delta; |
| 1198 | struct linux_itimer *nv = value, *ov = ovalue; |
| 1199 | |
| 1200 | trace("sys_setitimer(%d, %p, %p)", which, value, ovalue); |
| 1201 | |
| 1202 | p = current->signal; |
| 1203 | t = p->t; |
| 1204 | |
| 1205 | if(which < 0 || which >= nelem(t->itimer)) |
| 1206 | return -EINVAL; |
| 1207 | |
| 1208 | now = nsec(); |
| 1209 | delta = t->itimer[which].interval; |
| 1210 | rem = t->itimer[which].expire - now; |
| 1211 | if(rem < 0) |
| 1212 | rem = 0; |
| 1213 | if(nv != nil){ |
| 1214 | trace("nv->{interval->{%ld, %ld}, value->{%ld, %ld}}", |
| 1215 | nv->it_interval.tv_sec, nv->it_interval.tv_usec, |
| 1216 | nv->it_value.tv_sec, nv->it_value.tv_usec); |
| 1217 | t->itimer[which].interval = hzround(nv->it_interval.tv_sec*1000000000LL + |
| 1218 | nv->it_interval.tv_usec*1000); |
| 1219 | t->itimer[which].expire = (now + nv->it_value.tv_sec*1000000000LL + |
| 1220 | nv->it_value.tv_usec*1000); |
| 1221 | setalarm(t->itimer[which].expire); |
| 1222 | } |
| 1223 | |
| 1224 | if(ov != nil){ |
| 1225 | ov->it_interval.tv_sec = delta / 1000000000LL; |
| 1226 | ov->it_interval.tv_usec = (delta % 1000000000LL)/1000; |
| 1227 | ov->it_value.tv_sec = rem / 1000000000LL; |
| 1228 | ov->it_value.tv_usec = (rem % 1000000000LL)/1000; |
| 1229 | trace("ov->{interval->{%ld, %ld}, value->{%ld, %ld}}", |
| 1230 | ov->it_interval.tv_sec, ov->it_interval.tv_usec, |
| 1231 | ov->it_value.tv_sec, ov->it_value.tv_usec); |
| 1232 | } |
| 1233 | |
| 1234 | return 0; |
| 1235 | } |
| 1236 | |
| 1237 | int sys_getitimer(int which, void *value) |
| 1238 | { |
| 1239 | Private *p; |
| 1240 | Timers *t; |
| 1241 | vlong rem, delta; |
| 1242 | struct linux_itimer *v = value; |
| 1243 | |
| 1244 | trace("sys_getitimer(%d, %p)", which, value); |
| 1245 | |
| 1246 | p = current->signal; |
| 1247 | t = p->t; |
| 1248 | |
| 1249 | if(value == nil) |
| 1250 | return -EINVAL; |
| 1251 | if(which < 0 || which >= nelem(t->itimer)) |
| 1252 | return -EINVAL; |
| 1253 | |
| 1254 | delta =t->itimer[which].interval; |
| 1255 | rem = t->itimer[which].expire - nsec(); |
| 1256 | |
| 1257 | if(rem < 0) |
| 1258 | rem = 0; |
| 1259 | v->it_interval.tv_sec = delta / 1000000000LL; |
| 1260 | v->it_interval.tv_usec = (delta % 1000000000LL)/1000; |
| 1261 | v->it_value.tv_sec = rem / 1000000000LL; |
| 1262 | v->it_value.tv_usec = (rem % 1000000000LL)/1000; |
| 1263 | |
| 1264 | return 0; |
| 1265 | } |
| 1266 | |
| 1267 | int sys_alarm(long seconds) |
| 1268 | { |
| 1269 | Private *p; |
| 1270 | Timers *t; |
| 1271 | vlong old, now; |
| 1272 | |
| 1273 | trace("sys_alarm(%ld)", seconds); |
| 1274 | p = current->signal; |
| 1275 | t = p->t; |
| 1276 | now = nsec(); |
| 1277 | old = t->itimer[0].expire - now; |
| 1278 | if(old < 0) |
| 1279 | old = 0; |
| 1280 | t->itimer[0].interval = 0; |
| 1281 | if(seconds > 0){ |
| 1282 | t->itimer[0].expire = now + (vlong)seconds * 1000000000LL; |
| 1283 | setalarm(t->itimer[0].expire); |
| 1284 | } else { |
| 1285 | t->itimer[0].expire = 0; |
| 1286 | } |
| 1287 | return old / 1000000000LL; |
| 1288 | } |
| 1289 | |
| 1290 | int |
| 1291 | Sfmt(Fmt *f) |
| 1292 | { |
| 1293 | static char *t[] = { |
| 1294 | [SIGHUP] = "SIGHUP", |
| 1295 | [SIGINT] = "SIGINT", |
| 1296 | [SIGQUIT] = "SIGQUIT", |
| 1297 | [SIGILL] = "SIGILL", |
| 1298 | [SIGTRAP] = "SIGTRAP", |
| 1299 | [SIGABRT] = "SIGABRT", |
| 1300 | [SIGBUS] = "SIGBUS", |
| 1301 | [SIGFPE] = "SIGFPE", |
| 1302 | [SIGKILL] = "SIGKILL", |
| 1303 | [SIGUSR1] = "SIGUSR1", |
| 1304 | [SIGSEGV] = "SIGSEGV", |
| 1305 | [SIGUSR2] = "SIGUSR2", |
| 1306 | [SIGPIPE] = "SIGPIPE", |
| 1307 | [SIGALRM] = "SIGALRM", |
| 1308 | [SIGTERM] = "SIGTERM", |
| 1309 | [SIGSTKFLT] = "SIGSTKFLT", |
| 1310 | [SIGCHLD] = "SIGCHLD", |
| 1311 | [SIGCONT] = "SIGCONT", |
| 1312 | [SIGSTOP] = "SIGSTOP", |
| 1313 | [SIGTSTP] = "SIGTSTP", |
| 1314 | [SIGTTIN] = "SIGTTIN", |
| 1315 | [SIGTTOU] = "SIGTTOU", |
| 1316 | [SIGURG] = "SIGURG", |
| 1317 | [SIGXCPU] = "SIGXCPU", |
| 1318 | [SIGXFSZ] = "SIGXFSZ", |
| 1319 | [SIGVTALRM] = "SIGVTALRM", |
| 1320 | [SIGPROF] = "SIGPROF", |
| 1321 | [SIGWINCH] = "SIGWINCH", |
| 1322 | [SIGIO] = "SIGIO", |
| 1323 | [SIGPWR] = "SIGPWR", |
| 1324 | [SIGSYS] = "SIGSYS", |
| 1325 | [SIGRT1] = "SIGRT1", |
| 1326 | [SIGRT2] = "SIGRT2", |
| 1327 | [SIGRT3] = "SIGRT3", |
| 1328 | [SIGRT4] = "SIGRT4", |
| 1329 | [SIGRT5] = "SIGRT5", |
| 1330 | [SIGRT6] = "SIGRT6", |
| 1331 | [SIGRT7] = "SIGRT7", |
| 1332 | [SIGRT8] = "SIGRT8", |
| 1333 | }; |
| 1334 | |
| 1335 | int sig; |
| 1336 | |
| 1337 | sig = va_arg(f->args, int); |
| 1338 | if(sig < 1 || sig >= SIGMAX) |
| 1339 | return fmtprint(f, "%d", sig); |
| 1340 | return fmtprint(f, "%d [%s]", sig, t[sig]); |
| 1341 | } |
| 1342 | |
| 1343 | /* proc.c */ |
| 1344 | extern int procsetalarm(Uproc *proc, vlong t); |
| 1345 | |
| 1346 | void |
| 1347 | alarmtimer(Uproc *proc, vlong now) |
| 1348 | { |
| 1349 | Private *p; |
| 1350 | Timers *t; |
| 1351 | vlong expire, delta; |
| 1352 | Usiginfo si; |
| 1353 | int i, overrun; |
| 1354 | |
| 1355 | if((p = proc->signal) == nil) |
| 1356 | return; |
| 1357 | t = p->t; |
| 1358 | for(i=0; i < nelem(t->itimer); i++){ |
| 1359 | expire = t->itimer[i].expire; |
| 1360 | if(expire <= 0) |
| 1361 | continue; |
| 1362 | if(now < expire){ |
| 1363 | procsetalarm(proc, expire); |
| 1364 | continue; |
| 1365 | } |
| 1366 | overrun = 0; |
| 1367 | delta = (t->itimer[i].interval); |
| 1368 | if(delta > 0){ |
| 1369 | expire += delta; |
| 1370 | while(expire <= now){ |
| 1371 | expire += delta; |
| 1372 | overrun++; |
| 1373 | } |
| 1374 | procsetalarm(proc, expire); |
| 1375 | } else { |
| 1376 | expire = 0; |
| 1377 | } |
| 1378 | t->itimer[i].expire = expire; |
| 1379 | |
| 1380 | memset(&si, 0, sizeof(si)); |
| 1381 | si.signo = SIGALRM; |
| 1382 | si.code = SI_TIMER; |
| 1383 | si.timer.tid = i; |
| 1384 | si.timer.overrun = overrun; |
| 1385 | killproc(proc, &si, 1); |
| 1386 | } |
| 1387 | } |