proc.c revision 1.39
1 /* $NetBSD: proc.c,v 1.39 2020/04/03 18:11:29 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 1980, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)proc.c 8.1 (Berkeley) 5/31/93"; 36 #else 37 __RCSID("$NetBSD: proc.c,v 1.39 2020/04/03 18:11:29 joerg Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/types.h> 42 #include <sys/wait.h> 43 44 #include <errno.h> 45 #include <stdarg.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "csh.h" 51 #include "dir.h" 52 #include "extern.h" 53 #include "proc.h" 54 55 #define BIGINDEX 9 /* largest desirable job index */ 56 57 extern int insource; 58 59 struct process proclist; 60 int pnoprocesses; 61 62 struct process *pholdjob; 63 64 struct process *pcurrjob; 65 struct process *pcurrent; 66 struct process *pprevious; 67 68 int pmaxindex; 69 70 static void pflushall(void); 71 static void pflush(struct process *); 72 static void pclrcurr(struct process *); 73 static void padd(struct command *); 74 static int pprint(struct process *, int); 75 static void ptprint(struct process *); 76 static void pads(Char *); 77 static void pkill(Char **v, int); 78 static struct process *pgetcurr(struct process *); 79 static void okpcntl(void); 80 81 /* 82 * pchild - called at interrupt level by the SIGCHLD signal 83 * indicating that at least one child has terminated or stopped 84 * thus at least one wait system call will definitely return a 85 * childs status. Top level routines (like pwait) must be sure 86 * to mask interrupts when playing with the proclist data structures! 87 */ 88 /* ARGSUSED */ 89 void 90 pchild(int notused) 91 { 92 struct rusage ru; 93 struct process *fp, *pp; 94 int jobflags, pid, w; 95 96 loop: 97 errno = 0; /* reset, just in case */ 98 pid = wait3(&w, 99 (setintr && (intty || insource) ? WNOHANG | WUNTRACED : WNOHANG), &ru); 100 101 if (pid <= 0) { 102 if (errno == EINTR) { 103 errno = 0; 104 goto loop; 105 } 106 pnoprocesses = pid == -1; 107 return; 108 } 109 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) 110 if (pid == pp->p_pid) 111 goto found; 112 goto loop; 113 found: 114 if (pid == atoi(short2str(value(STRchild)))) 115 unsetv(STRchild); 116 pp->p_flags &= ~(PRUNNING | PSTOPPED | PREPORTED); 117 if (WIFSTOPPED(w)) { 118 pp->p_flags |= PSTOPPED; 119 pp->p_reason = WSTOPSIG(w); 120 } 121 else { 122 if (pp->p_flags & (PTIME | PPTIME) || adrof(STRtime)) 123 (void)clock_gettime(CLOCK_MONOTONIC, &pp->p_etime); 124 125 pp->p_rusage = ru; 126 if (WIFSIGNALED(w)) { 127 if (WTERMSIG(w) == SIGINT) 128 pp->p_flags |= PINTERRUPTED; 129 else 130 pp->p_flags |= PSIGNALED; 131 if (WCOREDUMP(w)) 132 pp->p_flags |= PDUMPED; 133 pp->p_reason = WTERMSIG(w); 134 } 135 else { 136 pp->p_reason = WEXITSTATUS(w); 137 if (pp->p_reason != 0) 138 pp->p_flags |= PAEXITED; 139 else 140 pp->p_flags |= PNEXITED; 141 } 142 } 143 jobflags = 0; 144 fp = pp; 145 do { 146 if ((fp->p_flags & (PPTIME | PRUNNING | PSTOPPED)) == 0 && 147 !child && adrof(STRtime) && 148 fp->p_rusage.ru_utime.tv_sec + fp->p_rusage.ru_stime.tv_sec 149 >= atoi(short2str(value(STRtime)))) 150 fp->p_flags |= PTIME; 151 jobflags |= fp->p_flags; 152 } while ((fp = fp->p_friends) != pp); 153 pp->p_flags &= ~PFOREGND; 154 if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { 155 pp->p_flags &= ~PPTIME; 156 pp->p_flags |= PTIME; 157 } 158 if ((jobflags & (PRUNNING | PREPORTED)) == 0) { 159 fp = pp; 160 do { 161 if (fp->p_flags & PSTOPPED) 162 fp->p_flags |= PREPORTED; 163 } while ((fp = fp->p_friends) != pp); 164 while (fp->p_pid != fp->p_jobid) 165 fp = fp->p_friends; 166 if (jobflags & PSTOPPED) { 167 if (pcurrent && pcurrent != fp) 168 pprevious = pcurrent; 169 pcurrent = fp; 170 } 171 else 172 pclrcurr(fp); 173 if (jobflags & PFOREGND) { 174 if (jobflags & (PSIGNALED | PSTOPPED | PPTIME) || 175 #ifdef IIASA 176 jobflags & PAEXITED || 177 #endif 178 !eq(dcwd->di_name, fp->p_cwd->di_name)) { 179 ; /* print in pjwait */ 180 } 181 /* PWP: print a newline after ^C */ 182 else if (jobflags & PINTERRUPTED) { 183 (void)vis_fputc('\r' | QUOTE, cshout); 184 (void)fputc('\n', cshout); 185 } 186 } 187 else { 188 if (jobflags & PNOTIFY || adrof(STRnotify)) { 189 (void)vis_fputc('\r' | QUOTE, cshout); 190 (void)fputc('\n', cshout); 191 (void)pprint(pp, NUMBER | NAME | REASON); 192 if ((jobflags & PSTOPPED) == 0) 193 pflush(pp); 194 } 195 else { 196 fp->p_flags |= PNEEDNOTE; 197 neednote++; 198 } 199 } 200 } 201 goto loop; 202 } 203 204 void 205 pnote(void) 206 { 207 struct process *pp; 208 sigset_t osigset, nsigset; 209 int flags; 210 211 neednote = 0; 212 sigemptyset(&nsigset); 213 (void)sigaddset(&nsigset, SIGCHLD); 214 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) { 215 if (pp->p_flags & PNEEDNOTE) { 216 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 217 pp->p_flags &= ~PNEEDNOTE; 218 flags = pprint(pp, NUMBER | NAME | REASON); 219 if ((flags & (PRUNNING | PSTOPPED)) == 0) 220 pflush(pp); 221 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 222 } 223 } 224 } 225 226 /* 227 * pwait - wait for current job to terminate, maintaining integrity 228 * of current and previous job indicators. 229 */ 230 void 231 pwait(void) 232 { 233 struct process *fp, *pp; 234 sigset_t osigset, nsigset; 235 236 /* 237 * Here's where dead procs get flushed. 238 */ 239 sigemptyset(&nsigset); 240 (void)sigaddset(&nsigset, SIGCHLD); 241 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 242 for (pp = (fp = &proclist)->p_next; pp != NULL; pp = (fp = pp)->p_next) 243 if (pp->p_pid == 0) { 244 fp->p_next = pp->p_next; 245 free(pp->p_command); 246 if (pp->p_cwd && --pp->p_cwd->di_count == 0) 247 if (pp->p_cwd->di_next == 0) 248 dfree(pp->p_cwd); 249 free(pp); 250 pp = fp; 251 } 252 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 253 pjwait(pcurrjob); 254 } 255 256 257 /* 258 * pjwait - wait for a job to finish or become stopped 259 * It is assumed to be in the foreground state (PFOREGND) 260 */ 261 void 262 pjwait(struct process *pp) 263 { 264 struct process *fp; 265 sigset_t osigset, nsigset; 266 int jobflags, reason; 267 268 while (pp->p_pid != pp->p_jobid) 269 pp = pp->p_friends; 270 fp = pp; 271 272 do { 273 if ((fp->p_flags & (PFOREGND | PRUNNING)) == PRUNNING) 274 (void)fprintf(csherr, "BUG: waiting for background job!\n"); 275 } while ((fp = fp->p_friends) != pp); 276 /* 277 * Now keep pausing as long as we are not interrupted (SIGINT), and the 278 * target process, or any of its friends, are running 279 */ 280 fp = pp; 281 sigemptyset(&nsigset); 282 (void)sigaddset(&nsigset, SIGCHLD); 283 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 284 for (;;) { 285 sigemptyset(&nsigset); 286 (void)sigaddset(&nsigset, SIGCHLD); 287 (void)sigprocmask(SIG_BLOCK, &nsigset, NULL); 288 jobflags = 0; 289 do 290 jobflags |= fp->p_flags; 291 while ((fp = (fp->p_friends)) != pp); 292 if ((jobflags & PRUNNING) == 0) 293 break; 294 #ifdef JOBDEBUG 295 (void)fprintf(csherr, "starting to sigsuspend for SIGCHLD on %d\n", 296 fp->p_pid); 297 #endif /* JOBDEBUG */ 298 nsigset = osigset; 299 (void)sigdelset(&nsigset, SIGCHLD); 300 (void)sigsuspend(&nsigset); 301 } 302 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 303 if (tpgrp > 0) /* get tty back */ 304 (void)tcsetpgrp(FSHTTY, tpgrp); 305 if ((jobflags & (PSIGNALED | PSTOPPED | PTIME)) || 306 !eq(dcwd->di_name, fp->p_cwd->di_name)) { 307 if (jobflags & PSTOPPED) { 308 (void) fputc('\n', cshout); 309 if (adrof(STRlistjobs)) { 310 Char *jobcommand[3]; 311 312 jobcommand[0] = STRjobs; 313 if (eq(value(STRlistjobs), STRlong)) 314 jobcommand[1] = STRml; 315 else 316 jobcommand[1] = NULL; 317 jobcommand[2] = NULL; 318 319 dojobs(jobcommand, NULL); 320 (void)pprint(pp, SHELLDIR); 321 } 322 else 323 (void)pprint(pp, AREASON | SHELLDIR); 324 } 325 else 326 (void)pprint(pp, AREASON | SHELLDIR); 327 } 328 if ((jobflags & (PINTERRUPTED | PSTOPPED)) && setintr && 329 (!gointr || !eq(gointr, STRminus))) { 330 if ((jobflags & PSTOPPED) == 0) 331 pflush(pp); 332 pintr1(0); 333 } 334 reason = 0; 335 fp = pp; 336 do { 337 if (fp->p_reason) 338 reason = fp->p_flags & (PSIGNALED | PINTERRUPTED) ? 339 fp->p_reason | META : fp->p_reason; 340 } while ((fp = fp->p_friends) != pp); 341 if ((reason != 0) && (adrof(STRprintexitvalue))) { 342 (void)fprintf(cshout, "Exit %d\n", reason); 343 } 344 set(STRstatus, putn(reason)); 345 if (reason && exiterr) 346 exitstat(); 347 pflush(pp); 348 } 349 350 /* 351 * dowait - wait for all processes to finish 352 */ 353 void 354 /*ARGSUSED*/ 355 dowait(Char **v, struct command *t) 356 { 357 struct process *pp; 358 sigset_t osigset, nsigset; 359 360 pjobs++; 361 sigemptyset(&nsigset); 362 (void)sigaddset(&nsigset, SIGCHLD); 363 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 364 loop: 365 for (pp = proclist.p_next; pp; pp = pp->p_next) 366 if (pp->p_pid && /* pp->p_pid == pp->p_jobid && */ 367 pp->p_flags & PRUNNING) { 368 sigemptyset(&nsigset); 369 (void)sigsuspend(&nsigset); 370 goto loop; 371 } 372 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 373 pjobs = 0; 374 } 375 376 /* 377 * pflushall - flush all jobs from list (e.g. at fork()) 378 */ 379 static void 380 pflushall(void) 381 { 382 struct process *pp; 383 384 for (pp = proclist.p_next; pp != NULL; pp = pp->p_next) 385 if (pp->p_pid) 386 pflush(pp); 387 } 388 389 /* 390 * pflush - flag all process structures in the same job as the 391 * the argument process for deletion. The actual free of the 392 * space is not done here since pflush is called at interrupt level. 393 */ 394 static void 395 pflush(struct process *pp) 396 { 397 struct process *np; 398 int idx; 399 400 if (pp->p_pid == 0) { 401 (void)fprintf(csherr, "BUG: process flushed twice"); 402 return; 403 } 404 while (pp->p_pid != pp->p_jobid) 405 pp = pp->p_friends; 406 pclrcurr(pp); 407 if (pp == pcurrjob) 408 pcurrjob = 0; 409 idx = pp->p_index; 410 np = pp; 411 do { 412 np->p_index = np->p_pid = 0; 413 np->p_flags &= ~PNEEDNOTE; 414 } while ((np = np->p_friends) != pp); 415 if (idx == pmaxindex) { 416 for (np = proclist.p_next, idx = 0; np; np = np->p_next) 417 if (np->p_index > idx) 418 idx = np->p_index; 419 pmaxindex = idx; 420 } 421 } 422 423 /* 424 * pclrcurr - make sure the given job is not the current or previous job; 425 * pp MUST be the job leader 426 */ 427 static void 428 pclrcurr(struct process *pp) 429 { 430 if (pp == pcurrent) { 431 if (pprevious != NULL) { 432 pcurrent = pprevious; 433 pprevious = pgetcurr(pp); 434 } 435 else { 436 pcurrent = pgetcurr(pp); 437 pprevious = pgetcurr(pp); 438 } 439 } else if (pp == pprevious) 440 pprevious = pgetcurr(pp); 441 } 442 443 /* +4 here is 1 for '\0', 1 ea for << >& >> */ 444 static Char command[PMAXLEN + 4]; 445 static size_t cmdlen; 446 static Char *cmdp; 447 448 /* 449 * palloc - allocate a process structure and fill it up. 450 * an important assumption is made that the process is running. 451 */ 452 void 453 palloc(int pid, struct command *t) 454 { 455 struct process *pp; 456 int i; 457 458 pp = (struct process *)xcalloc(1, (size_t)sizeof(struct process)); 459 pp->p_pid = pid; 460 pp->p_flags = t->t_dflg & F_AMPERSAND ? PRUNNING : PRUNNING | PFOREGND; 461 if (t->t_dflg & F_TIME) 462 pp->p_flags |= PPTIME; 463 cmdp = command; 464 cmdlen = 0; 465 padd(t); 466 *cmdp++ = 0; 467 if (t->t_dflg & F_PIPEOUT) { 468 pp->p_flags |= PPOU; 469 if (t->t_dflg & F_STDERR) 470 pp->p_flags |= PERR; 471 } 472 pp->p_command = Strsave(command); 473 if (pcurrjob) { 474 struct process *fp; 475 476 /* careful here with interrupt level */ 477 pp->p_cwd = 0; 478 pp->p_index = pcurrjob->p_index; 479 pp->p_friends = pcurrjob; 480 pp->p_jobid = pcurrjob->p_pid; 481 for (fp = pcurrjob; fp->p_friends != pcurrjob; fp = fp->p_friends) 482 continue; 483 fp->p_friends = pp; 484 } 485 else { 486 pcurrjob = pp; 487 pp->p_jobid = pid; 488 pp->p_friends = pp; 489 pp->p_cwd = dcwd; 490 dcwd->di_count++; 491 if (pmaxindex < BIGINDEX) 492 pp->p_index = ++pmaxindex; 493 else { 494 struct process *np; 495 496 for (i = 1;; i++) { 497 for (np = proclist.p_next; np; np = np->p_next) 498 if (np->p_index == i) 499 goto tryagain; 500 pp->p_index = i; 501 if (i > pmaxindex) 502 pmaxindex = i; 503 break; 504 tryagain:; 505 } 506 } 507 if (pcurrent == NULL) 508 pcurrent = pp; 509 else if (pprevious == NULL) 510 pprevious = pp; 511 } 512 pp->p_next = proclist.p_next; 513 proclist.p_next = pp; 514 (void)clock_gettime(CLOCK_MONOTONIC, &pp->p_btime); 515 } 516 517 static void 518 padd(struct command *t) 519 { 520 Char **argp; 521 522 if (t == 0) 523 return; 524 switch (t->t_dtyp) { 525 case NODE_PAREN: 526 pads(STRLparensp); 527 padd(t->t_dspr); 528 pads(STRspRparen); 529 break; 530 case NODE_COMMAND: 531 for (argp = t->t_dcom; *argp; argp++) { 532 pads(*argp); 533 if (argp[1]) 534 pads(STRspace); 535 } 536 break; 537 case NODE_OR: 538 case NODE_AND: 539 case NODE_PIPE: 540 case NODE_LIST: 541 padd(t->t_dcar); 542 switch (t->t_dtyp) { 543 case NODE_OR: 544 pads(STRspor2sp); 545 break; 546 case NODE_AND: 547 pads(STRspand2sp); 548 break; 549 case NODE_PIPE: 550 pads(STRsporsp); 551 break; 552 case NODE_LIST: 553 pads(STRsemisp); 554 break; 555 } 556 padd(t->t_dcdr); 557 return; 558 } 559 if ((t->t_dflg & F_PIPEIN) == 0 && t->t_dlef) { 560 pads((t->t_dflg & F_READ) ? STRspLarrow2sp : STRspLarrowsp); 561 pads(t->t_dlef); 562 } 563 if ((t->t_dflg & F_PIPEOUT) == 0 && t->t_drit) { 564 pads((t->t_dflg & F_APPEND) ? STRspRarrow2 : STRspRarrow); 565 if (t->t_dflg & F_STDERR) 566 pads(STRand); 567 pads(STRspace); 568 pads(t->t_drit); 569 } 570 } 571 572 static void 573 pads(Char *cp) 574 { 575 size_t i; 576 577 /* 578 * Avoid the Quoted Space alias hack! Reported by: 579 * sam (at) john-bigboote.ICS.UCI.EDU (Sam Horrocks) 580 */ 581 if (cp[0] == STRQNULL[0]) 582 cp++; 583 584 i = Strlen(cp); 585 586 if (cmdlen >= PMAXLEN) 587 return; 588 if (cmdlen + i >= PMAXLEN) { 589 (void)Strcpy(cmdp, STRsp3dots); 590 cmdlen = PMAXLEN; 591 cmdp += 4; 592 return; 593 } 594 (void)Strcpy(cmdp, cp); 595 cmdp += i; 596 cmdlen += i; 597 } 598 599 /* 600 * psavejob - temporarily save the current job on a one level stack 601 * so another job can be created. Used for { } in exp6 602 * and `` in globbing. 603 */ 604 void 605 psavejob(void) 606 { 607 pholdjob = pcurrjob; 608 pcurrjob = NULL; 609 } 610 611 /* 612 * prestjob - opposite of psavejob. This may be missed if we are interrupted 613 * somewhere, but pendjob cleans up anyway. 614 */ 615 void 616 prestjob(void) 617 { 618 pcurrjob = pholdjob; 619 pholdjob = NULL; 620 } 621 622 /* 623 * pendjob - indicate that a job (set of commands) has been completed 624 * or is about to begin. 625 */ 626 void 627 pendjob(void) 628 { 629 struct process *pp, *tp; 630 631 if (pcurrjob && (pcurrjob->p_flags & (PFOREGND | PSTOPPED)) == 0) { 632 pp = pcurrjob; 633 while (pp->p_pid != pp->p_jobid) 634 pp = pp->p_friends; 635 (void)fprintf(cshout, "[%d]", pp->p_index); 636 tp = pp; 637 do { 638 (void)fprintf(cshout, " %ld", (long)pp->p_pid); 639 pp = pp->p_friends; 640 } while (pp != tp); 641 (void)fputc('\n', cshout); 642 } 643 pholdjob = pcurrjob = 0; 644 } 645 646 /* 647 * pprint - print a job 648 */ 649 static int 650 pprint(struct process *pp, int flag) 651 { 652 static struct rusage zru; 653 struct process *tp; 654 const char *format; 655 int jobflags, pstatus, reason, status; 656 int hadnl; 657 658 hadnl = 1; /* did we just have a newline */ 659 (void)fpurge(cshout); 660 661 while (pp->p_pid != pp->p_jobid) 662 pp = pp->p_friends; 663 if (pp == pp->p_friends && (pp->p_flags & PPTIME)) { 664 pp->p_flags &= ~PPTIME; 665 pp->p_flags |= PTIME; 666 } 667 tp = pp; 668 status = reason = -1; 669 jobflags = 0; 670 do { 671 jobflags |= pp->p_flags; 672 pstatus = pp->p_flags & PALLSTATES; 673 if (tp != pp && !hadnl && !(flag & FANCY) && 674 ((pstatus == status && pp->p_reason == reason) || 675 !(flag & REASON))) { 676 (void)fputc(' ', cshout); 677 hadnl = 0; 678 } 679 else { 680 if (tp != pp && !hadnl) { 681 (void)fputc('\n', cshout); 682 hadnl = 1; 683 } 684 if (flag & NUMBER) { 685 if (pp == tp) 686 (void)fprintf(cshout, "[%d]%s %c ", pp->p_index, 687 pp->p_index < 10 ? " " : "", 688 pp == pcurrent ? '+' : 689 (pp == pprevious ? '-' : ' ')); 690 else 691 (void)fprintf(cshout, " "); 692 hadnl = 0; 693 } 694 if (flag & FANCY) { 695 (void)fprintf(cshout, "%5ld ", (long)pp->p_pid); 696 hadnl = 0; 697 } 698 if (flag & (REASON | AREASON)) { 699 if (flag & NAME) 700 format = "%-23s"; 701 else 702 format = "%s"; 703 if (pstatus == status) { 704 if (pp->p_reason == reason) { 705 (void)fprintf(cshout, format, ""); 706 hadnl = 0; 707 goto prcomd; 708 } 709 else 710 reason = pp->p_reason; 711 } else { 712 status = pstatus; 713 reason = pp->p_reason; 714 } 715 switch (status) { 716 case PRUNNING: 717 (void)fprintf(cshout, format, "Running "); 718 hadnl = 0; 719 break; 720 case PINTERRUPTED: 721 case PSTOPPED: 722 case PSIGNALED: 723 /* 724 * tell what happened to the background job 725 * From: Michael Schroeder 726 * <mlschroe (at) immd4.informatik.uni-erlangen.de> 727 */ 728 if ((flag & REASON) 729 || ((flag & AREASON) 730 && reason != SIGINT 731 && (reason != SIGPIPE 732 || (pp->p_flags & PPOU) == 0))) { 733 (void)fprintf(cshout, format, 734 sys_siglist[(unsigned char) 735 pp->p_reason]); 736 hadnl = 0; 737 } 738 break; 739 case PNEXITED: 740 case PAEXITED: 741 if (flag & REASON) { 742 if (pp->p_reason) 743 (void)fprintf(cshout, "Exit %-18d", pp->p_reason); 744 else 745 (void)fprintf(cshout, format, "Done"); 746 hadnl = 0; 747 } 748 break; 749 default: 750 (void)fprintf(csherr, "BUG: status=%-9o", status); 751 } 752 } 753 } 754 prcomd: 755 if (flag & NAME) { 756 (void)fprintf(cshout, "%s", vis_str(pp->p_command)); 757 if (pp->p_flags & PPOU) 758 (void)fprintf(cshout, " |"); 759 if (pp->p_flags & PERR) 760 (void)fputc('&', cshout); 761 hadnl = 0; 762 } 763 if (flag & (REASON | AREASON) && pp->p_flags & PDUMPED) { 764 (void)fprintf(cshout, " (core dumped)"); 765 hadnl = 0; 766 } 767 if (tp == pp->p_friends) { 768 if (flag & AMPERSAND) { 769 (void)fprintf(cshout, " &"); 770 hadnl = 0; 771 } 772 if (flag & JOBDIR && 773 !eq(tp->p_cwd->di_name, dcwd->di_name)) { 774 (void)fprintf(cshout, " (wd: "); 775 dtildepr(value(STRhome), tp->p_cwd->di_name); 776 (void)fputc(')', cshout); 777 hadnl = 0; 778 } 779 } 780 if (pp->p_flags & PPTIME && !(status & (PSTOPPED | PRUNNING))) { 781 if (!hadnl) 782 (void)fprintf(cshout, "\n\t"); 783 prusage(cshout, &zru, &pp->p_rusage, &pp->p_etime, 784 &pp->p_btime); 785 hadnl = 1; 786 } 787 if (tp == pp->p_friends) { 788 if (!hadnl) { 789 (void)fputc('\n', cshout); 790 hadnl = 1; 791 } 792 if (flag & SHELLDIR && !eq(tp->p_cwd->di_name, dcwd->di_name)) { 793 (void)fprintf(cshout, "(wd now: "); 794 dtildepr(value(STRhome), dcwd->di_name); 795 (void)fprintf(cshout, ")\n"); 796 hadnl = 1; 797 } 798 } 799 } while ((pp = pp->p_friends) != tp); 800 if (jobflags & PTIME && (jobflags & (PSTOPPED | PRUNNING)) == 0) { 801 if (jobflags & NUMBER) 802 (void)fprintf(cshout, " "); 803 ptprint(tp); 804 hadnl = 1; 805 } 806 (void)fflush(cshout); 807 return (jobflags); 808 } 809 810 static void 811 ptprint(struct process *tp) 812 { 813 static struct rusage zru; 814 static struct timespec ztime; 815 struct rusage ru; 816 struct timespec tetime, diff; 817 struct process *pp; 818 819 pp = tp; 820 ru = zru; 821 tetime = ztime; 822 do { 823 ruadd(&ru, &pp->p_rusage); 824 timespecsub(&pp->p_etime, &pp->p_btime, &diff); 825 if (timespeccmp(&diff, &tetime, >)) 826 tetime = diff; 827 } while ((pp = pp->p_friends) != tp); 828 prusage(cshout, &zru, &ru, &tetime, &ztime); 829 } 830 831 /* 832 * dojobs - print all jobs 833 */ 834 void 835 /*ARGSUSED*/ 836 dojobs(Char **v, struct command *t) 837 { 838 struct process *pp; 839 int flag, i; 840 841 flag = NUMBER | NAME | REASON; 842 if (chkstop) 843 chkstop = 2; 844 if (*++v) { 845 if (v[1] || !eq(*v, STRml)) 846 stderror(ERR_JOBS); 847 flag |= FANCY | JOBDIR; 848 } 849 for (i = 1; i <= pmaxindex; i++) 850 for (pp = proclist.p_next; pp; pp = pp->p_next) 851 if (pp->p_index == i && pp->p_pid == pp->p_jobid) { 852 pp->p_flags &= ~PNEEDNOTE; 853 if (!(pprint(pp, flag) & (PRUNNING | PSTOPPED))) 854 pflush(pp); 855 break; 856 } 857 } 858 859 /* 860 * dofg - builtin - put the job into the foreground 861 */ 862 void 863 /*ARGSUSED*/ 864 dofg(Char **v, struct command *t) 865 { 866 struct process *pp; 867 868 okpcntl(); 869 ++v; 870 do { 871 pp = pfind(*v); 872 pstart(pp, 1); 873 pjwait(pp); 874 } while (*v && *++v); 875 } 876 877 /* 878 * %... - builtin - put the job into the foreground 879 */ 880 void 881 /*ARGSUSED*/ 882 dofg1(Char **v, struct command *t) 883 { 884 struct process *pp; 885 886 okpcntl(); 887 pp = pfind(v[0]); 888 pstart(pp, 1); 889 pjwait(pp); 890 } 891 892 /* 893 * dobg - builtin - put the job into the background 894 */ 895 void 896 /*ARGSUSED*/ 897 dobg(Char **v, struct command *t) 898 { 899 struct process *pp; 900 901 okpcntl(); 902 ++v; 903 do { 904 pp = pfind(*v); 905 pstart(pp, 0); 906 } while (*v && *++v); 907 } 908 909 /* 910 * %... & - builtin - put the job into the background 911 */ 912 void 913 /*ARGSUSED*/ 914 dobg1(Char **v, struct command *t) 915 { 916 struct process *pp; 917 918 pp = pfind(v[0]); 919 pstart(pp, 0); 920 } 921 922 /* 923 * dostop - builtin - stop the job 924 */ 925 void 926 /*ARGSUSED*/ 927 dostop(Char **v, struct command *t) 928 { 929 pkill(++v, SIGSTOP); 930 } 931 932 /* 933 * dokill - builtin - superset of kill (1) 934 */ 935 void 936 /*ARGSUSED*/ 937 dokill(Char **v, struct command *t) 938 { 939 Char *signame; 940 char *name; 941 long signum; 942 char *ep; 943 944 signum = SIGTERM; 945 v++; 946 if (v[0] && v[0][0] == '-') { 947 if (v[0][1] == 'l') { 948 if (v[1]) { 949 if (!Isdigit(v[1][0])) 950 stderror(ERR_NAME | ERR_BADSIG); 951 952 signum = strtol(short2str(v[1]), &ep, 10); 953 if (signum < 0 || signum >= NSIG) 954 stderror(ERR_NAME | ERR_BADSIG); 955 else if (signum == 0) 956 (void)fputc('0', cshout); /* 0's symbolic name is '0' */ 957 else 958 (void)fprintf(cshout, "%s ", sys_signame[signum]); 959 } else { 960 for (signum = 1; signum < NSIG; signum++) { 961 (void)fprintf(cshout, "%s ", sys_signame[signum]); 962 if (signum == NSIG / 2) 963 (void)fputc('\n', cshout); 964 } 965 } 966 (void)fputc('\n', cshout); 967 return; 968 } 969 if (Isdigit(v[0][1])) { 970 signum = strtol(short2str(v[0] + 1), &ep, 10); 971 if (signum < 0 || signum >= NSIG || *ep) 972 stderror(ERR_NAME | ERR_BADSIG); 973 } 974 else { 975 if (v[0][1] == 's' && v[0][2] == '\0') 976 signame = *(++v); 977 else 978 signame = &v[0][1]; 979 980 if (signame == NULL || v[1] == NULL) 981 stderror(ERR_NAME | ERR_TOOFEW); 982 983 name = short2str(signame); 984 for (signum = 1; signum < NSIG; signum++) 985 if (!strcasecmp(sys_signame[signum], name) || 986 (!strncasecmp("SIG", name, 3) && /* skip "SIG" prefix */ 987 !strcasecmp(sys_signame[signum], name + 3))) 988 break; 989 990 if (signum == NSIG) { 991 if (signame[0] == '0') 992 signum = 0; 993 else { 994 setname(vis_str(signame)); 995 stderror(ERR_NAME | ERR_UNKSIG); 996 } 997 } 998 } 999 v++; 1000 } 1001 pkill(v, (int)signum); 1002 } 1003 1004 static void 1005 pkill(Char **v, int signum) 1006 { 1007 struct process *pp, *np; 1008 Char *cp; 1009 sigset_t nsigset; 1010 int err1, jobflags, pid; 1011 char *ep; 1012 1013 jobflags = 0; 1014 err1 = 0; 1015 sigemptyset(&nsigset); 1016 (void)sigaddset(&nsigset, SIGCHLD); 1017 if (setintr) 1018 (void)sigaddset(&nsigset, SIGINT); 1019 (void)sigprocmask(SIG_BLOCK, &nsigset, NULL); 1020 gflag = 0, tglob(v); 1021 if (gflag) { 1022 v = globall(v); 1023 if (v == 0) 1024 stderror(ERR_NAME | ERR_NOMATCH); 1025 } 1026 else { 1027 v = gargv = saveblk(v); 1028 trim(v); 1029 } 1030 1031 while (v && (cp = *v)) { 1032 if (*cp == '%') { 1033 np = pp = pfind(cp); 1034 do 1035 jobflags |= np->p_flags; 1036 while ((np = np->p_friends) != pp); 1037 switch (signum) { 1038 case SIGSTOP: 1039 case SIGTSTP: 1040 case SIGTTIN: 1041 case SIGTTOU: 1042 if ((jobflags & PRUNNING) == 0) { 1043 (void)fprintf(csherr, "%s: Already suspended\n", 1044 vis_str(cp)); 1045 err1++; 1046 goto cont; 1047 } 1048 break; 1049 /* 1050 * suspend a process, kill -CONT %, then type jobs; the shell 1051 * says it is suspended, but it is running; thanks jaap.. 1052 */ 1053 case SIGCONT: 1054 pstart(pp, 0); 1055 goto cont; 1056 } 1057 if (kill(-pp->p_jobid, signum) < 0) { 1058 (void)fprintf(csherr, "%s: %s\n", vis_str(cp), 1059 strerror(errno)); 1060 err1++; 1061 } 1062 if (signum == SIGTERM || signum == SIGHUP) 1063 (void)kill(-pp->p_jobid, SIGCONT); 1064 } 1065 else if (!(Isdigit(*cp) || *cp == '-')) 1066 stderror(ERR_NAME | ERR_JOBARGS); 1067 else { 1068 pid = (pid_t)strtoul(short2str(cp), &ep, 0); 1069 if (*ep) { 1070 (void)fprintf(csherr, "%s: Badly formed number\n", 1071 short2str(cp)); 1072 err1++; 1073 goto cont; 1074 } else if (kill(pid, signum) < 0) { 1075 (void)fprintf(csherr, "%d: %s\n", pid, strerror(errno)); 1076 err1++; 1077 goto cont; 1078 } 1079 if (signum == SIGTERM || signum == SIGHUP) 1080 (void)kill((pid_t) pid, SIGCONT); 1081 } 1082 cont: 1083 v++; 1084 } 1085 if (gargv) 1086 blkfree(gargv), gargv = 0; 1087 (void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL); 1088 if (err1) 1089 stderror(ERR_SILENT); 1090 } 1091 1092 /* 1093 * pstart - start the job in foreground/background 1094 */ 1095 void 1096 pstart(struct process *pp, int foregnd) 1097 { 1098 struct process *np; 1099 sigset_t osigset, nsigset; 1100 long jobflags; 1101 1102 jobflags = 0; 1103 sigemptyset(&nsigset); 1104 (void)sigaddset(&nsigset, SIGCHLD); 1105 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 1106 np = pp; 1107 do { 1108 jobflags |= np->p_flags; 1109 if (np->p_flags & (PRUNNING | PSTOPPED)) { 1110 np->p_flags |= PRUNNING; 1111 np->p_flags &= ~PSTOPPED; 1112 if (foregnd) 1113 np->p_flags |= PFOREGND; 1114 else 1115 np->p_flags &= ~PFOREGND; 1116 } 1117 } while ((np = np->p_friends) != pp); 1118 if (!foregnd) 1119 pclrcurr(pp); 1120 (void)pprint(pp, foregnd ? NAME | JOBDIR : NUMBER | NAME | AMPERSAND); 1121 if (foregnd) 1122 (void)tcsetpgrp(FSHTTY, pp->p_jobid); 1123 if (jobflags & PSTOPPED) 1124 (void)kill(-pp->p_jobid, SIGCONT); 1125 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 1126 } 1127 1128 void 1129 panystop(int neednl) 1130 { 1131 struct process *pp; 1132 1133 chkstop = 2; 1134 for (pp = proclist.p_next; pp; pp = pp->p_next) 1135 if (pp->p_flags & PSTOPPED) 1136 stderror(ERR_STOPPED, neednl ? "\n" : ""); 1137 } 1138 1139 struct process * 1140 pfind(Char *cp) 1141 { 1142 struct process *pp, *np; 1143 1144 if (cp == 0 || cp[1] == 0 || eq(cp, STRcent2) || eq(cp, STRcentplus)) { 1145 if (pcurrent == NULL) 1146 stderror(ERR_NAME | ERR_JOBCUR); 1147 return (pcurrent); 1148 } 1149 if (eq(cp, STRcentminus) || eq(cp, STRcenthash)) { 1150 if (pprevious == NULL) 1151 stderror(ERR_NAME | ERR_JOBPREV); 1152 return (pprevious); 1153 } 1154 if (Isdigit(cp[1])) { 1155 int idx = atoi(short2str(cp + 1)); 1156 1157 for (pp = proclist.p_next; pp; pp = pp->p_next) 1158 if (pp->p_index == idx && pp->p_pid == pp->p_jobid) 1159 return (pp); 1160 stderror(ERR_NAME | ERR_NOSUCHJOB); 1161 } 1162 np = NULL; 1163 for (pp = proclist.p_next; pp; pp = pp->p_next) 1164 if (pp->p_pid == pp->p_jobid) { 1165 if (cp[1] == '?') { 1166 Char *dp; 1167 1168 for (dp = pp->p_command; *dp; dp++) { 1169 if (*dp != cp[2]) 1170 continue; 1171 if (prefix(cp + 2, dp)) 1172 goto match; 1173 } 1174 } 1175 else if (prefix(cp + 1, pp->p_command)) { 1176 match: 1177 if (np) 1178 stderror(ERR_NAME | ERR_AMBIG); 1179 np = pp; 1180 } 1181 } 1182 if (np) 1183 return (np); 1184 stderror(ERR_NAME | (cp[1] == '?' ? ERR_JOBPAT : ERR_NOSUCHJOB)); 1185 /* NOTREACHED */ 1186 } 1187 1188 /* 1189 * pgetcurr - find most recent job that is not pp, preferably stopped 1190 */ 1191 static struct process * 1192 pgetcurr(struct process *pp) 1193 { 1194 struct process *np, *xp; 1195 1196 xp = NULL; 1197 for (np = proclist.p_next; np; np = np->p_next) 1198 if (np != pcurrent && np != pp && np->p_pid && 1199 np->p_pid == np->p_jobid) { 1200 if (np->p_flags & PSTOPPED) 1201 return (np); 1202 if (xp == NULL) 1203 xp = np; 1204 } 1205 return (xp); 1206 } 1207 1208 /* 1209 * donotify - flag the job so as to report termination asynchronously 1210 */ 1211 void 1212 /*ARGSUSED*/ 1213 donotify(Char **v, struct command *t) 1214 { 1215 struct process *pp; 1216 1217 pp = pfind(*++v); 1218 pp->p_flags |= PNOTIFY; 1219 } 1220 1221 /* 1222 * Do the fork and whatever should be done in the child side that 1223 * should not be done if we are not forking at all (like for simple builtin's) 1224 * Also do everything that needs any signals fiddled with in the parent side 1225 * 1226 * Wanttty tells whether process and/or tty pgrps are to be manipulated: 1227 * -1: leave tty alone; inherit pgrp from parent 1228 * 0: already have tty; manipulate process pgrps only 1229 * 1: want to claim tty; manipulate process and tty pgrps 1230 * It is usually just the value of tpgrp. 1231 */ 1232 1233 int 1234 pfork(struct command *t /* command we are forking for */, int wanttty) 1235 { 1236 int pgrp, pid; 1237 sigset_t osigset, nsigset; 1238 int ignint; 1239 1240 ignint = 0; 1241 /* 1242 * A child will be uninterruptible only under very special conditions. 1243 * Remember that the semantics of '&' is implemented by disconnecting the 1244 * process from the tty so signals do not need to ignored just for '&'. 1245 * Thus signals are set to default action for children unless: we have had 1246 * an "onintr -" (then specifically ignored) we are not playing with 1247 * signals (inherit action) 1248 */ 1249 if (setintr) 1250 ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) 1251 || (gointr && eq(gointr, STRminus)); 1252 /* 1253 * Check for maximum nesting of 16 processes to avoid Forking loops 1254 */ 1255 if (child == 16) 1256 stderror(ERR_NESTING, 16); 1257 /* 1258 * Hold SIGCHLD until we have the process installed in our table. 1259 */ 1260 sigemptyset(&nsigset); 1261 (void)sigaddset(&nsigset, SIGCHLD); 1262 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 1263 while ((pid = fork()) < 0) 1264 if (setintr == 0) 1265 (void)sleep(FORKSLEEP); 1266 else { 1267 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 1268 stderror(ERR_NOPROC); 1269 } 1270 if (pid == 0) { 1271 settimes(); 1272 pgrp = pcurrjob ? pcurrjob->p_jobid : getpid(); 1273 pflushall(); 1274 pcurrjob = NULL; 1275 child++; 1276 if (setintr) { 1277 setintr = 0; /* until I think otherwise */ 1278 /* 1279 * Children just get blown away on SIGINT, SIGQUIT unless "onintr 1280 * -" seen. 1281 */ 1282 (void)signal(SIGINT, ignint ? SIG_IGN : SIG_DFL); 1283 (void)signal(SIGQUIT, ignint ? SIG_IGN : SIG_DFL); 1284 if (wanttty >= 0) { 1285 /* make stoppable */ 1286 (void)signal(SIGTSTP, SIG_DFL); 1287 (void)signal(SIGTTIN, SIG_DFL); 1288 (void)signal(SIGTTOU, SIG_DFL); 1289 } 1290 (void)signal(SIGTERM, parterm); 1291 } 1292 else if (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT)) { 1293 (void)signal(SIGINT, SIG_IGN); 1294 (void)signal(SIGQUIT, SIG_IGN); 1295 } 1296 pgetty(wanttty, pgrp); 1297 /* 1298 * Nohup and nice apply only to NODE_COMMAND's but it would be nice 1299 * (?!?) if you could say "nohup (foo;bar)" Then the parser would have 1300 * to know about nice/nohup/time 1301 */ 1302 if (t->t_dflg & F_NOHUP) 1303 (void)signal(SIGHUP, SIG_IGN); 1304 if (t->t_dflg & F_NICE) 1305 (void)setpriority(PRIO_PROCESS, 0, t->t_nice); 1306 } 1307 else { 1308 if (wanttty >= 0) 1309 (void)setpgid(pid, pcurrjob ? pcurrjob->p_jobid : pid); 1310 palloc(pid, t); 1311 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 1312 } 1313 1314 return (pid); 1315 } 1316 1317 static void 1318 okpcntl(void) 1319 { 1320 if (tpgrp == -1) 1321 stderror(ERR_JOBCONTROL); 1322 if (tpgrp == 0) 1323 stderror(ERR_JOBCTRLSUB); 1324 /* NOTREACHED */ 1325 } 1326 1327 /* 1328 * if we don't have vfork(), things can still go in the wrong order 1329 * resulting in the famous 'Stopped (tty output)'. But some systems 1330 * don't permit the setpgid() call, (these are more recent secure 1331 * systems such as ibm's aix). Then we'd rather print an error message 1332 * than hang the shell! 1333 * I am open to suggestions how to fix that. 1334 */ 1335 void 1336 pgetty(int wanttty, int pgrp) 1337 { 1338 sigset_t osigset, nsigset; 1339 1340 /* 1341 * christos: I am blocking the tty signals till I've set things 1342 * correctly.... 1343 */ 1344 if (wanttty > 0) { 1345 sigemptyset(&nsigset); 1346 (void)sigaddset(&nsigset, SIGTSTP); 1347 (void)sigaddset(&nsigset, SIGTTIN); 1348 (void)sigaddset(&nsigset, SIGTTOU); 1349 (void)sigprocmask(SIG_BLOCK, &nsigset, &osigset); 1350 } 1351 /* 1352 * From: Michael Schroeder <mlschroe (at) immd4.informatik.uni-erlangen.de> 1353 * Don't check for tpgrp >= 0 so even non-interactive shells give 1354 * background jobs process groups Same for the comparison in the other part 1355 * of the #ifdef 1356 */ 1357 if (wanttty >= 0) 1358 if (setpgid(0, pgrp) == -1) { 1359 (void)fprintf(csherr, "csh: setpgid error.\n"); 1360 xexit(0); 1361 } 1362 1363 if (wanttty > 0) { 1364 (void)tcsetpgrp(FSHTTY, pgrp); 1365 (void)sigprocmask(SIG_SETMASK, &osigset, NULL); 1366 } 1367 1368 if (tpgrp > 0) 1369 tpgrp = 0; /* gave tty away */ 1370 } 1371
Indexes created Tue Sep 23 14:10:03 GMT 2025