jobs.c revision 287750
190075Sobrien/*- 2169689Skan * Copyright (c) 1991, 1993 3169689Skan * The Regents of the University of California. All rights reserved. 490075Sobrien * 5132718Skan * This code is derived from software contributed to Berkeley by 690075Sobrien * Kenneth Almquist. 7132718Skan * 890075Sobrien * Redistribution and use in source and binary forms, with or without 990075Sobrien * modification, are permitted provided that the following conditions 1090075Sobrien * are met: 1190075Sobrien * 1. Redistributions of source code must retain the above copyright 12132718Skan * notice, this list of conditions and the following disclaimer. 1390075Sobrien * 2. Redistributions in binary form must reproduce the above copyright 1490075Sobrien * notice, this list of conditions and the following disclaimer in the 1590075Sobrien * documentation and/or other materials provided with the distribution. 1690075Sobrien * 4. Neither the name of the University nor the names of its contributors 1790075Sobrien * may be used to endorse or promote products derived from this software 18132718Skan * without specific prior written permission. 19169689Skan * 20169689Skan * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2190075Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2290075Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2390075Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2490075Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2590075Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2690075Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2790075Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2890075Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2990075Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3090075Sobrien * SUCH DAMAGE. 3190075Sobrien */ 3290075Sobrien 3390075Sobrien#ifndef lint 3490075Sobrien#if 0 3590075Sobrienstatic char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 3690075Sobrien#endif 3790075Sobrien#endif /* not lint */ 3890075Sobrien#include <sys/cdefs.h> 3990075Sobrien__FBSDID("$FreeBSD: stable/10/bin/sh/jobs.c 287750 2015-09-13 13:43:08Z jilles $"); 4090075Sobrien 4190075Sobrien#include <sys/ioctl.h> 4290075Sobrien#include <sys/param.h> 4390075Sobrien#include <sys/resource.h> 44117395Skan#include <sys/time.h> 45117395Skan#include <sys/wait.h> 4690075Sobrien#include <errno.h> 4790075Sobrien#include <fcntl.h> 4890075Sobrien#include <paths.h> 4990075Sobrien#include <signal.h> 5090075Sobrien#include <stddef.h> 5190075Sobrien#include <stdlib.h> 5290075Sobrien#include <unistd.h> 5390075Sobrien 5490075Sobrien#include "shell.h" 5590075Sobrien#if JOBS 5690075Sobrien#include <termios.h> 5790075Sobrien#undef CEOF /* syntax.h redefines this */ 58117395Skan#endif 59169689Skan#include "redir.h" 60169689Skan#include "exec.h" 61117395Skan#include "show.h" 62117395Skan#include "main.h" 63117395Skan#include "parser.h" 64117395Skan#include "nodes.h" 65117395Skan#include "jobs.h" 66117395Skan#include "options.h" 67117395Skan#include "trap.h" 68117395Skan#include "syntax.h" 69117395Skan#include "input.h" 70117395Skan#include "output.h" 71117395Skan#include "memalloc.h" 7290075Sobrien#include "error.h" 7390075Sobrien#include "mystring.h" 7490075Sobrien#include "var.h" 7590075Sobrien#include "builtins.h" 7690075Sobrien 7790075Sobrien 78132718Skanstatic struct job *jobtab; /* array of jobs */ 7990075Sobrienstatic int njobs; /* size of array */ 8090075Sobrienstatic pid_t backgndpid = -1; /* pid of last background process */ 8190075Sobrienstatic struct job *bgjob = NULL; /* last background process */ 8290075Sobrien#if JOBS 8390075Sobrienstatic struct job *jobmru; /* most recently used job list */ 8490075Sobrienstatic pid_t initialpgrp; /* pgrp of shell on invocation */ 8590075Sobrien#endif 8690075Sobrienstatic int ttyfd = -1; 8790075Sobrien 8890075Sobrien/* mode flags for dowait */ 8990075Sobrien#define DOWAIT_BLOCK 0x1 /* wait until a child exits */ 9090075Sobrien#define DOWAIT_SIG 0x2 /* if DOWAIT_BLOCK, abort on SIGINT/SIGQUIT */ 9190075Sobrien#define DOWAIT_SIG_ANY 0x4 /* if DOWAIT_SIG, abort on any signal */ 9290075Sobrien 9390075Sobrien#if JOBS 9490075Sobrienstatic void restartjob(struct job *); 9590075Sobrien#endif 9690075Sobrienstatic void freejob(struct job *); 9790075Sobrienstatic int waitcmdloop(struct job *); 9890075Sobrienpid_t getjobpgrp(char *); 9990075Sobrienstatic struct job *getjob_nonotfound(const char *); 10090075Sobrienstatic struct job *getjob(const char *); 10190075Sobrienstatic pid_t dowait(int, struct job *); 10290075Sobrienstatic void checkzombies(void); 10390075Sobrienstatic void cmdtxt(union node *); 10490075Sobrienstatic void cmdputs(const char *); 10590075Sobrien#if JOBS 10690075Sobrienstatic void setcurjob(struct job *); 10790075Sobrienstatic void deljob(struct job *); 10890075Sobrienstatic struct job *getcurjob(struct job *); 10990075Sobrien#endif 11090075Sobrienstatic void printjobcmd(struct job *); 11190075Sobrienstatic void showjob(struct job *, int); 11290075Sobrien 11390075Sobrien 11490075Sobrien/* 11590075Sobrien * Turn job control on and off. 11690075Sobrien */ 11790075Sobrien 11890075Sobrienstatic int jobctl; 11990075Sobrien 12090075Sobrien#if JOBS 12190075Sobrienvoid 12290075Sobriensetjobctl(int on) 12390075Sobrien{ 12490075Sobrien int i; 12590075Sobrien 12690075Sobrien if (on == jobctl || rootshell == 0) 12790075Sobrien return; 12890075Sobrien if (on) { 12990075Sobrien if (ttyfd != -1) 13090075Sobrien close(ttyfd); 13190075Sobrien if ((ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC)) < 0) { 13290075Sobrien i = 0; 13390075Sobrien while (i <= 2 && !isatty(i)) 13490075Sobrien i++; 13590075Sobrien if (i > 2 || 13690075Sobrien (ttyfd = fcntl(i, F_DUPFD_CLOEXEC, 10)) < 0) 13790075Sobrien goto out; 13890075Sobrien } 13990075Sobrien if (ttyfd < 10) { 14090075Sobrien /* 14190075Sobrien * Keep our TTY file descriptor out of the way of 14290075Sobrien * the user's redirections. 14390075Sobrien */ 14490075Sobrien if ((i = fcntl(ttyfd, F_DUPFD_CLOEXEC, 10)) < 0) { 14590075Sobrien close(ttyfd); 14690075Sobrien ttyfd = -1; 14790075Sobrien goto out; 14890075Sobrien } 14990075Sobrien close(ttyfd); 15090075Sobrien ttyfd = i; 15190075Sobrien } 15290075Sobrien do { /* while we are in the background */ 15390075Sobrien initialpgrp = tcgetpgrp(ttyfd); 15490075Sobrien if (initialpgrp < 0) { 15590075Sobrienout: out2fmt_flush("sh: can't access tty; job control turned off\n"); 15690075Sobrien mflag = 0; 15790075Sobrien return; 15890075Sobrien } 15990075Sobrien if (initialpgrp != getpgrp()) { 16090075Sobrien kill(0, SIGTTIN); 16190075Sobrien continue; 16290075Sobrien } 16390075Sobrien } while (0); 16490075Sobrien setsignal(SIGTSTP); 16590075Sobrien setsignal(SIGTTOU); 16690075Sobrien setsignal(SIGTTIN); 16790075Sobrien setpgid(0, rootpid); 16890075Sobrien tcsetpgrp(ttyfd, rootpid); 16990075Sobrien } else { /* turning job control off */ 17090075Sobrien setpgid(0, initialpgrp); 17190075Sobrien tcsetpgrp(ttyfd, initialpgrp); 17290075Sobrien close(ttyfd); 17390075Sobrien ttyfd = -1; 17490075Sobrien setsignal(SIGTSTP); 17590075Sobrien setsignal(SIGTTOU); 17690075Sobrien setsignal(SIGTTIN); 17790075Sobrien } 17890075Sobrien jobctl = on; 17990075Sobrien} 18090075Sobrien#endif 18190075Sobrien 18290075Sobrien 18390075Sobrien#if JOBS 18490075Sobrienint 18590075Sobrienfgcmd(int argc __unused, char **argv __unused) 18690075Sobrien{ 18790075Sobrien struct job *jp; 18890075Sobrien pid_t pgrp; 18990075Sobrien int status; 19090075Sobrien 19190075Sobrien nextopt(""); 19290075Sobrien jp = getjob(*argptr); 19390075Sobrien if (jp->jobctl == 0) 19490075Sobrien error("job not created under job control"); 19590075Sobrien printjobcmd(jp); 19690075Sobrien flushout(&output); 19790075Sobrien pgrp = jp->ps[0].pid; 19890075Sobrien tcsetpgrp(ttyfd, pgrp); 19990075Sobrien restartjob(jp); 20090075Sobrien jp->foreground = 1; 20190075Sobrien INTOFF; 20290075Sobrien status = waitforjob(jp, (int *)NULL); 20390075Sobrien INTON; 20490075Sobrien return status; 20590075Sobrien} 20690075Sobrien 20790075Sobrien 20890075Sobrienint 20990075Sobrienbgcmd(int argc, char **argv) 21090075Sobrien{ 21190075Sobrien struct job *jp; 21290075Sobrien 21390075Sobrien nextopt(""); 21490075Sobrien do { 21590075Sobrien jp = getjob(*argptr); 21690075Sobrien if (jp->jobctl == 0) 21790075Sobrien error("job not created under job control"); 21890075Sobrien if (jp->state == JOBDONE) 21990075Sobrien continue; 22090075Sobrien restartjob(jp); 22190075Sobrien jp->foreground = 0; 22290075Sobrien out1fmt("[%td] ", jp - jobtab + 1); 22390075Sobrien printjobcmd(jp); 22490075Sobrien } while (*argptr != NULL && *++argptr != NULL); 22590075Sobrien return 0; 22690075Sobrien} 22790075Sobrien 22890075Sobrien 22990075Sobrienstatic void 23090075Sobrienrestartjob(struct job *jp) 23190075Sobrien{ 23290075Sobrien struct procstat *ps; 23390075Sobrien int i; 234169689Skan 235169689Skan if (jp->state == JOBDONE) 236 return; 237 setcurjob(jp); 238 INTOFF; 239 kill(-jp->ps[0].pid, SIGCONT); 240 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 241 if (WIFSTOPPED(ps->status)) { 242 ps->status = -1; 243 jp->state = 0; 244 } 245 } 246 INTON; 247} 248#endif 249 250 251int 252jobscmd(int argc __unused, char *argv[] __unused) 253{ 254 char *id; 255 int ch, mode; 256 257 mode = SHOWJOBS_DEFAULT; 258 while ((ch = nextopt("lps")) != '\0') { 259 switch (ch) { 260 case 'l': 261 mode = SHOWJOBS_VERBOSE; 262 break; 263 case 'p': 264 mode = SHOWJOBS_PGIDS; 265 break; 266 case 's': 267 mode = SHOWJOBS_PIDS; 268 break; 269 } 270 } 271 272 if (*argptr == NULL) 273 showjobs(0, mode); 274 else 275 while ((id = *argptr++) != NULL) 276 showjob(getjob(id), mode); 277 278 return (0); 279} 280 281static void 282printjobcmd(struct job *jp) 283{ 284 struct procstat *ps; 285 int i; 286 287 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 288 out1str(ps->cmd); 289 if (i > 0) 290 out1str(" | "); 291 } 292 out1c('\n'); 293} 294 295static void 296showjob(struct job *jp, int mode) 297{ 298 char s[64]; 299 char statestr[64]; 300 const char *sigstr; 301 struct procstat *ps; 302 struct job *j; 303 int col, curr, i, jobno, prev, procno; 304 char c; 305 306 procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs; 307 jobno = jp - jobtab + 1; 308 curr = prev = 0; 309#if JOBS 310 if ((j = getcurjob(NULL)) != NULL) { 311 curr = j - jobtab + 1; 312 if ((j = getcurjob(j)) != NULL) 313 prev = j - jobtab + 1; 314 } 315#endif 316 ps = jp->ps + jp->nprocs - 1; 317 if (jp->state == 0) { 318 strcpy(statestr, "Running"); 319#if JOBS 320 } else if (jp->state == JOBSTOPPED) { 321 while (!WIFSTOPPED(ps->status) && ps > jp->ps) 322 ps--; 323 if (WIFSTOPPED(ps->status)) 324 i = WSTOPSIG(ps->status); 325 else 326 i = -1; 327 sigstr = strsignal(i); 328 if (sigstr != NULL) 329 strcpy(statestr, sigstr); 330 else 331 strcpy(statestr, "Suspended"); 332#endif 333 } else if (WIFEXITED(ps->status)) { 334 if (WEXITSTATUS(ps->status) == 0) 335 strcpy(statestr, "Done"); 336 else 337 fmtstr(statestr, 64, "Done(%d)", 338 WEXITSTATUS(ps->status)); 339 } else { 340 i = WTERMSIG(ps->status); 341 sigstr = strsignal(i); 342 if (sigstr != NULL) 343 strcpy(statestr, sigstr); 344 else 345 strcpy(statestr, "Unknown signal"); 346 if (WCOREDUMP(ps->status)) 347 strcat(statestr, " (core dumped)"); 348 } 349 350 for (ps = jp->ps ; procno > 0 ; ps++, procno--) { /* for each process */ 351 if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) { 352 out1fmt("%d\n", (int)ps->pid); 353 continue; 354 } 355 if (mode != SHOWJOBS_VERBOSE && ps != jp->ps) 356 continue; 357 if (jobno == curr && ps == jp->ps) 358 c = '+'; 359 else if (jobno == prev && ps == jp->ps) 360 c = '-'; 361 else 362 c = ' '; 363 if (ps == jp->ps) 364 fmtstr(s, 64, "[%d] %c ", jobno, c); 365 else 366 fmtstr(s, 64, " %c ", c); 367 out1str(s); 368 col = strlen(s); 369 if (mode == SHOWJOBS_VERBOSE) { 370 fmtstr(s, 64, "%d ", (int)ps->pid); 371 out1str(s); 372 col += strlen(s); 373 } 374 if (ps == jp->ps) { 375 out1str(statestr); 376 col += strlen(statestr); 377 } 378 do { 379 out1c(' '); 380 col++; 381 } while (col < 30); 382 if (mode == SHOWJOBS_VERBOSE) { 383 out1str(ps->cmd); 384 out1c('\n'); 385 } else 386 printjobcmd(jp); 387 } 388} 389 390/* 391 * Print a list of jobs. If "change" is nonzero, only print jobs whose 392 * statuses have changed since the last call to showjobs. 393 * 394 * If the shell is interrupted in the process of creating a job, the 395 * result may be a job structure containing zero processes. Such structures 396 * will be freed here. 397 */ 398 399void 400showjobs(int change, int mode) 401{ 402 int jobno; 403 struct job *jp; 404 405 TRACE(("showjobs(%d) called\n", change)); 406 checkzombies(); 407 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 408 if (! jp->used) 409 continue; 410 if (jp->nprocs == 0) { 411 freejob(jp); 412 continue; 413 } 414 if (change && ! jp->changed) 415 continue; 416 showjob(jp, mode); 417 if (mode == SHOWJOBS_DEFAULT || mode == SHOWJOBS_VERBOSE) { 418 jp->changed = 0; 419 /* Hack: discard jobs for which $! has not been 420 * referenced in interactive mode when they terminate. 421 */ 422 if (jp->state == JOBDONE && !jp->remembered && 423 (iflag || jp != bgjob)) { 424 freejob(jp); 425 } 426 } 427 } 428} 429 430 431/* 432 * Mark a job structure as unused. 433 */ 434 435static void 436freejob(struct job *jp) 437{ 438 struct procstat *ps; 439 int i; 440 441 INTOFF; 442 if (bgjob == jp) 443 bgjob = NULL; 444 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 445 if (ps->cmd != nullstr) 446 ckfree(ps->cmd); 447 } 448 if (jp->ps != &jp->ps0) 449 ckfree(jp->ps); 450 jp->used = 0; 451#if JOBS 452 deljob(jp); 453#endif 454 INTON; 455} 456 457 458 459int 460waitcmd(int argc __unused, char **argv __unused) 461{ 462 struct job *job; 463 int retval; 464 465 nextopt(""); 466 if (*argptr == NULL) 467 return (waitcmdloop(NULL)); 468 469 do { 470 job = getjob_nonotfound(*argptr); 471 if (job == NULL) 472 retval = 127; 473 else 474 retval = waitcmdloop(job); 475 argptr++; 476 } while (*argptr != NULL); 477 478 return (retval); 479} 480 481static int 482waitcmdloop(struct job *job) 483{ 484 int status, retval, sig; 485 struct job *jp; 486 487 /* 488 * Loop until a process is terminated or stopped, or a SIGINT is 489 * received. 490 */ 491 492 do { 493 if (job != NULL) { 494 if (job->state == JOBDONE) { 495 status = job->ps[job->nprocs - 1].status; 496 if (WIFEXITED(status)) 497 retval = WEXITSTATUS(status); 498 else 499 retval = WTERMSIG(status) + 128; 500 if (! iflag || ! job->changed) 501 freejob(job); 502 else { 503 job->remembered = 0; 504 if (job == bgjob) 505 bgjob = NULL; 506 } 507 return retval; 508 } 509 } else { 510 for (jp = jobtab ; jp < jobtab + njobs; jp++) 511 if (jp->used && jp->state == JOBDONE) { 512 if (! iflag || ! jp->changed) 513 freejob(jp); 514 else { 515 jp->remembered = 0; 516 if (jp == bgjob) 517 bgjob = NULL; 518 } 519 } 520 for (jp = jobtab ; ; jp++) { 521 if (jp >= jobtab + njobs) { /* no running procs */ 522 return 0; 523 } 524 if (jp->used && jp->state == 0) 525 break; 526 } 527 } 528 } while (dowait(DOWAIT_BLOCK | DOWAIT_SIG, (struct job *)NULL) != -1); 529 530 sig = pendingsig_waitcmd; 531 pendingsig_waitcmd = 0; 532 return sig + 128; 533} 534 535 536 537int 538jobidcmd(int argc __unused, char **argv __unused) 539{ 540 struct job *jp; 541 int i; 542 543 nextopt(""); 544 jp = getjob(*argptr); 545 for (i = 0 ; i < jp->nprocs ; ) { 546 out1fmt("%d", (int)jp->ps[i].pid); 547 out1c(++i < jp->nprocs? ' ' : '\n'); 548 } 549 return 0; 550} 551 552 553 554/* 555 * Convert a job name to a job structure. 556 */ 557 558static struct job * 559getjob_nonotfound(const char *name) 560{ 561 int jobno; 562 struct job *found, *jp; 563 pid_t pid; 564 int i; 565 566 if (name == NULL) { 567#if JOBS 568currentjob: if ((jp = getcurjob(NULL)) == NULL) 569 error("No current job"); 570 return (jp); 571#else 572 error("No current job"); 573#endif 574 } else if (name[0] == '%') { 575 if (is_digit(name[1])) { 576 jobno = number(name + 1); 577 if (jobno > 0 && jobno <= njobs 578 && jobtab[jobno - 1].used != 0) 579 return &jobtab[jobno - 1]; 580#if JOBS 581 } else if (name[1] == '%' && name[2] == '\0') { 582 goto currentjob; 583 } else if (name[1] == '+' && name[2] == '\0') { 584 goto currentjob; 585 } else if (name[1] == '-' && name[2] == '\0') { 586 if ((jp = getcurjob(NULL)) == NULL || 587 (jp = getcurjob(jp)) == NULL) 588 error("No previous job"); 589 return (jp); 590#endif 591 } else if (name[1] == '?') { 592 found = NULL; 593 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 594 if (jp->used && jp->nprocs > 0 595 && strstr(jp->ps[0].cmd, name + 2) != NULL) { 596 if (found) 597 error("%s: ambiguous", name); 598 found = jp; 599 } 600 } 601 if (found != NULL) 602 return (found); 603 } else { 604 found = NULL; 605 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 606 if (jp->used && jp->nprocs > 0 607 && prefix(name + 1, jp->ps[0].cmd)) { 608 if (found) 609 error("%s: ambiguous", name); 610 found = jp; 611 } 612 } 613 if (found) 614 return found; 615 } 616 } else if (is_number(name)) { 617 pid = (pid_t)number(name); 618 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 619 if (jp->used && jp->nprocs > 0 620 && jp->ps[jp->nprocs - 1].pid == pid) 621 return jp; 622 } 623 } 624 return NULL; 625} 626 627 628static struct job * 629getjob(const char *name) 630{ 631 struct job *jp; 632 633 jp = getjob_nonotfound(name); 634 if (jp == NULL) 635 error("No such job: %s", name); 636 return (jp); 637} 638 639 640pid_t 641getjobpgrp(char *name) 642{ 643 struct job *jp; 644 645 jp = getjob(name); 646 return -jp->ps[0].pid; 647} 648 649/* 650 * Return a new job structure, 651 */ 652 653struct job * 654makejob(union node *node __unused, int nprocs) 655{ 656 int i; 657 struct job *jp; 658 659 for (i = njobs, jp = jobtab ; ; jp++) { 660 if (--i < 0) { 661 INTOFF; 662 if (njobs == 0) { 663 jobtab = ckmalloc(4 * sizeof jobtab[0]); 664#if JOBS 665 jobmru = NULL; 666#endif 667 } else { 668 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 669 memcpy(jp, jobtab, njobs * sizeof jp[0]); 670#if JOBS 671 /* Relocate `next' pointers and list head */ 672 if (jobmru != NULL) 673 jobmru = &jp[jobmru - jobtab]; 674 for (i = 0; i < njobs; i++) 675 if (jp[i].next != NULL) 676 jp[i].next = &jp[jp[i].next - 677 jobtab]; 678#endif 679 if (bgjob != NULL) 680 bgjob = &jp[bgjob - jobtab]; 681 /* Relocate `ps' pointers */ 682 for (i = 0; i < njobs; i++) 683 if (jp[i].ps == &jobtab[i].ps0) 684 jp[i].ps = &jp[i].ps0; 685 ckfree(jobtab); 686 jobtab = jp; 687 } 688 jp = jobtab + njobs; 689 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0) 690 ; 691 INTON; 692 break; 693 } 694 if (jp->used == 0) 695 break; 696 } 697 INTOFF; 698 jp->state = 0; 699 jp->used = 1; 700 jp->changed = 0; 701 jp->nprocs = 0; 702 jp->foreground = 0; 703 jp->remembered = 0; 704#if JOBS 705 jp->jobctl = jobctl; 706 jp->next = NULL; 707#endif 708 if (nprocs > 1) { 709 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 710 } else { 711 jp->ps = &jp->ps0; 712 } 713 INTON; 714 TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs, 715 jp - jobtab + 1)); 716 return jp; 717} 718 719#if JOBS 720static void 721setcurjob(struct job *cj) 722{ 723 struct job *jp, *prev; 724 725 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 726 if (jp == cj) { 727 if (prev != NULL) 728 prev->next = jp->next; 729 else 730 jobmru = jp->next; 731 jp->next = jobmru; 732 jobmru = cj; 733 return; 734 } 735 } 736 cj->next = jobmru; 737 jobmru = cj; 738} 739 740static void 741deljob(struct job *j) 742{ 743 struct job *jp, *prev; 744 745 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 746 if (jp == j) { 747 if (prev != NULL) 748 prev->next = jp->next; 749 else 750 jobmru = jp->next; 751 return; 752 } 753 } 754} 755 756/* 757 * Return the most recently used job that isn't `nj', and preferably one 758 * that is stopped. 759 */ 760static struct job * 761getcurjob(struct job *nj) 762{ 763 struct job *jp; 764 765 /* Try to find a stopped one.. */ 766 for (jp = jobmru; jp != NULL; jp = jp->next) 767 if (jp->used && jp != nj && jp->state == JOBSTOPPED) 768 return (jp); 769 /* Otherwise the most recently used job that isn't `nj' */ 770 for (jp = jobmru; jp != NULL; jp = jp->next) 771 if (jp->used && jp != nj) 772 return (jp); 773 774 return (NULL); 775} 776 777#endif 778 779/* 780 * Fork of a subshell. If we are doing job control, give the subshell its 781 * own process group. Jp is a job structure that the job is to be added to. 782 * N is the command that will be evaluated by the child. Both jp and n may 783 * be NULL. The mode parameter can be one of the following: 784 * FORK_FG - Fork off a foreground process. 785 * FORK_BG - Fork off a background process. 786 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 787 * process group even if job control is on. 788 * 789 * When job control is turned off, background processes have their standard 790 * input redirected to /dev/null (except for the second and later processes 791 * in a pipeline). 792 */ 793 794pid_t 795forkshell(struct job *jp, union node *n, int mode) 796{ 797 pid_t pid; 798 pid_t pgrp; 799 800 TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n, 801 mode)); 802 INTOFF; 803 if (mode == FORK_BG && (jp == NULL || jp->nprocs == 0)) 804 checkzombies(); 805 flushall(); 806 pid = fork(); 807 if (pid == -1) { 808 TRACE(("Fork failed, errno=%d\n", errno)); 809 INTON; 810 error("Cannot fork: %s", strerror(errno)); 811 } 812 if (pid == 0) { 813 struct job *p; 814 int wasroot; 815 int i; 816 817 TRACE(("Child shell %d\n", (int)getpid())); 818 wasroot = rootshell; 819 rootshell = 0; 820 handler = &main_handler; 821 closescript(); 822 INTON; 823 forcelocal = 0; 824 clear_traps(); 825#if JOBS 826 jobctl = 0; /* do job control only in root shell */ 827 if (wasroot && mode != FORK_NOJOB && mflag) { 828 if (jp == NULL || jp->nprocs == 0) 829 pgrp = getpid(); 830 else 831 pgrp = jp->ps[0].pid; 832 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) { 833 /*** this causes superfluous TIOCSPGRPS ***/ 834 if (tcsetpgrp(ttyfd, pgrp) < 0) 835 error("tcsetpgrp failed, errno=%d", errno); 836 } 837 setsignal(SIGTSTP); 838 setsignal(SIGTTOU); 839 } else if (mode == FORK_BG) { 840 ignoresig(SIGINT); 841 ignoresig(SIGQUIT); 842 if ((jp == NULL || jp->nprocs == 0) && 843 ! fd0_redirected_p ()) { 844 close(0); 845 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 846 error("cannot open %s: %s", 847 _PATH_DEVNULL, strerror(errno)); 848 } 849 } 850#else 851 if (mode == FORK_BG) { 852 ignoresig(SIGINT); 853 ignoresig(SIGQUIT); 854 if ((jp == NULL || jp->nprocs == 0) && 855 ! fd0_redirected_p ()) { 856 close(0); 857 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 858 error("cannot open %s: %s", 859 _PATH_DEVNULL, strerror(errno)); 860 } 861 } 862#endif 863 INTOFF; 864 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 865 if (p->used) 866 freejob(p); 867 INTON; 868 if (wasroot && iflag) { 869 setsignal(SIGINT); 870 setsignal(SIGQUIT); 871 setsignal(SIGTERM); 872 } 873 return pid; 874 } 875 if (rootshell && mode != FORK_NOJOB && mflag) { 876 if (jp == NULL || jp->nprocs == 0) 877 pgrp = pid; 878 else 879 pgrp = jp->ps[0].pid; 880 setpgid(pid, pgrp); 881 } 882 if (mode == FORK_BG) { 883 if (bgjob != NULL && bgjob->state == JOBDONE && 884 !bgjob->remembered && !iflag) 885 freejob(bgjob); 886 backgndpid = pid; /* set $! */ 887 bgjob = jp; 888 } 889 if (jp) { 890 struct procstat *ps = &jp->ps[jp->nprocs++]; 891 ps->pid = pid; 892 ps->status = -1; 893 ps->cmd = nullstr; 894 if (iflag && rootshell && n) 895 ps->cmd = commandtext(n); 896 jp->foreground = mode == FORK_FG; 897#if JOBS 898 setcurjob(jp); 899#endif 900 } 901 INTON; 902 TRACE(("In parent shell: child = %d\n", (int)pid)); 903 return pid; 904} 905 906 907pid_t 908vforkexecshell(struct job *jp, char **argv, char **envp, const char *path, int idx, int pip[2]) 909{ 910 pid_t pid; 911 struct jmploc jmploc; 912 struct jmploc *savehandler; 913 914 TRACE(("vforkexecshell(%%%td, %s, %p) called\n", jp - jobtab, argv[0], 915 (void *)pip)); 916 INTOFF; 917 flushall(); 918 savehandler = handler; 919 pid = vfork(); 920 if (pid == -1) { 921 TRACE(("Vfork failed, errno=%d\n", errno)); 922 INTON; 923 error("Cannot fork: %s", strerror(errno)); 924 } 925 if (pid == 0) { 926 TRACE(("Child shell %d\n", (int)getpid())); 927 if (setjmp(jmploc.loc)) 928 _exit(exception == EXEXEC ? exerrno : 2); 929 if (pip != NULL) { 930 close(pip[0]); 931 if (pip[1] != 1) { 932 dup2(pip[1], 1); 933 close(pip[1]); 934 } 935 } 936 handler = &jmploc; 937 shellexec(argv, envp, path, idx); 938 } 939 handler = savehandler; 940 if (jp) { 941 struct procstat *ps = &jp->ps[jp->nprocs++]; 942 ps->pid = pid; 943 ps->status = -1; 944 ps->cmd = nullstr; 945 jp->foreground = 1; 946#if JOBS 947 setcurjob(jp); 948#endif 949 } 950 INTON; 951 TRACE(("In parent shell: child = %d\n", (int)pid)); 952 return pid; 953} 954 955 956/* 957 * Wait for job to finish. 958 * 959 * Under job control we have the problem that while a child process is 960 * running interrupts generated by the user are sent to the child but not 961 * to the shell. This means that an infinite loop started by an inter- 962 * active user may be hard to kill. With job control turned off, an 963 * interactive user may place an interactive program inside a loop. If 964 * the interactive program catches interrupts, the user doesn't want 965 * these interrupts to also abort the loop. The approach we take here 966 * is to have the shell ignore interrupt signals while waiting for a 967 * foreground process to terminate, and then send itself an interrupt 968 * signal if the child process was terminated by an interrupt signal. 969 * Unfortunately, some programs want to do a bit of cleanup and then 970 * exit on interrupt; unless these processes terminate themselves by 971 * sending a signal to themselves (instead of calling exit) they will 972 * confuse this approach. 973 */ 974 975int 976waitforjob(struct job *jp, int *origstatus) 977{ 978#if JOBS 979 int propagate_int = jp->jobctl && jp->foreground; 980#endif 981 int status; 982 int st; 983 984 INTOFF; 985 TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1)); 986 while (jp->state == 0) 987 if (dowait(DOWAIT_BLOCK | (Tflag ? DOWAIT_SIG | 988 DOWAIT_SIG_ANY : 0), jp) == -1) 989 dotrap(); 990#if JOBS 991 if (jp->jobctl) { 992 if (tcsetpgrp(ttyfd, rootpid) < 0) 993 error("tcsetpgrp failed, errno=%d\n", errno); 994 } 995 if (jp->state == JOBSTOPPED) 996 setcurjob(jp); 997#endif 998 status = jp->ps[jp->nprocs - 1].status; 999 if (origstatus != NULL) 1000 *origstatus = status; 1001 /* convert to 8 bits */ 1002 if (WIFEXITED(status)) 1003 st = WEXITSTATUS(status); 1004#if JOBS 1005 else if (WIFSTOPPED(status)) 1006 st = WSTOPSIG(status) + 128; 1007#endif 1008 else 1009 st = WTERMSIG(status) + 128; 1010 if (! JOBS || jp->state == JOBDONE) 1011 freejob(jp); 1012 if (int_pending()) { 1013 if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGINT) 1014 CLEAR_PENDING_INT; 1015 } 1016#if JOBS 1017 else if (rootshell && iflag && propagate_int && 1018 WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 1019 kill(getpid(), SIGINT); 1020#endif 1021 INTON; 1022 return st; 1023} 1024 1025 1026static void 1027dummy_handler(int sig __unused) 1028{ 1029} 1030 1031/* 1032 * Wait for a process to terminate. 1033 */ 1034 1035static pid_t 1036dowait(int mode, struct job *job) 1037{ 1038 struct sigaction sa, osa; 1039 sigset_t mask, omask; 1040 pid_t pid; 1041 int status; 1042 struct procstat *sp; 1043 struct job *jp; 1044 struct job *thisjob; 1045 const char *sigstr; 1046 int done; 1047 int stopped; 1048 int sig; 1049 int coredump; 1050 int wflags; 1051 int restore_sigchld; 1052 1053 TRACE(("dowait(%d, %p) called\n", mode, job)); 1054 restore_sigchld = 0; 1055 if ((mode & DOWAIT_SIG) != 0) { 1056 sigfillset(&mask); 1057 sigprocmask(SIG_BLOCK, &mask, &omask); 1058 INTOFF; 1059 if (!issigchldtrapped()) { 1060 restore_sigchld = 1; 1061 sa.sa_handler = dummy_handler; 1062 sa.sa_flags = 0; 1063 sigemptyset(&sa.sa_mask); 1064 sigaction(SIGCHLD, &sa, &osa); 1065 } 1066 } 1067 do { 1068#if JOBS 1069 if (iflag) 1070 wflags = WUNTRACED | WCONTINUED; 1071 else 1072#endif 1073 wflags = 0; 1074 if ((mode & (DOWAIT_BLOCK | DOWAIT_SIG)) != DOWAIT_BLOCK) 1075 wflags |= WNOHANG; 1076 pid = wait3(&status, wflags, (struct rusage *)NULL); 1077 TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 1078 if (pid == 0 && (mode & DOWAIT_SIG) != 0) { 1079 pid = -1; 1080 if (((mode & DOWAIT_SIG_ANY) != 0 ? 1081 pendingsig : pendingsig_waitcmd) != 0) { 1082 errno = EINTR; 1083 break; 1084 } 1085 sigsuspend(&omask); 1086 if (int_pending()) 1087 break; 1088 } 1089 } while (pid == -1 && errno == EINTR); 1090 if (pid == -1 && errno == ECHILD && job != NULL) 1091 job->state = JOBDONE; 1092 if ((mode & DOWAIT_SIG) != 0) { 1093 if (restore_sigchld) 1094 sigaction(SIGCHLD, &osa, NULL); 1095 sigprocmask(SIG_SETMASK, &omask, NULL); 1096 INTON; 1097 } 1098 if (pid <= 0) 1099 return pid; 1100 INTOFF; 1101 thisjob = NULL; 1102 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 1103 if (jp->used && jp->nprocs > 0) { 1104 done = 1; 1105 stopped = 1; 1106 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 1107 if (sp->pid == -1) 1108 continue; 1109 if (sp->pid == pid) { 1110 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 1111 (int)pid, sp->status, 1112 status)); 1113 if (WIFCONTINUED(status)) { 1114 sp->status = -1; 1115 jp->state = 0; 1116 } else 1117 sp->status = status; 1118 thisjob = jp; 1119 } 1120 if (sp->status == -1) 1121 stopped = 0; 1122 else if (WIFSTOPPED(sp->status)) 1123 done = 0; 1124 } 1125 if (stopped) { /* stopped or done */ 1126 int state = done? JOBDONE : JOBSTOPPED; 1127 if (jp->state != state) { 1128 TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 1129 jp->state = state; 1130 if (jp != job) { 1131 if (done && !jp->remembered && 1132 !iflag && jp != bgjob) 1133 freejob(jp); 1134#if JOBS 1135 else if (done) 1136 deljob(jp); 1137#endif 1138 } 1139 } 1140 } 1141 } 1142 } 1143 INTON; 1144 if (!thisjob || thisjob->state == 0) 1145 ; 1146 else if ((!rootshell || !iflag || thisjob == job) && 1147 thisjob->foreground && thisjob->state != JOBSTOPPED) { 1148 sig = 0; 1149 coredump = 0; 1150 for (sp = thisjob->ps; sp < thisjob->ps + thisjob->nprocs; sp++) 1151 if (WIFSIGNALED(sp->status)) { 1152 sig = WTERMSIG(sp->status); 1153 coredump = WCOREDUMP(sp->status); 1154 } 1155 if (sig > 0 && sig != SIGINT && sig != SIGPIPE) { 1156 sigstr = strsignal(sig); 1157 if (sigstr != NULL) 1158 out2str(sigstr); 1159 else 1160 out2str("Unknown signal"); 1161 if (coredump) 1162 out2str(" (core dumped)"); 1163 out2c('\n'); 1164 flushout(out2); 1165 } 1166 } else { 1167 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job)); 1168 thisjob->changed = 1; 1169 } 1170 return pid; 1171} 1172 1173 1174 1175/* 1176 * return 1 if there are stopped jobs, otherwise 0 1177 */ 1178int job_warning = 0; 1179int 1180stoppedjobs(void) 1181{ 1182 int jobno; 1183 struct job *jp; 1184 1185 if (job_warning) 1186 return (0); 1187 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1188 if (jp->used == 0) 1189 continue; 1190 if (jp->state == JOBSTOPPED) { 1191 out2fmt_flush("You have stopped jobs.\n"); 1192 job_warning = 2; 1193 return (1); 1194 } 1195 } 1196 1197 return (0); 1198} 1199 1200 1201static void 1202checkzombies(void) 1203{ 1204 while (njobs > 0 && dowait(0, NULL) > 0) 1205 ; 1206} 1207 1208 1209int 1210backgndpidset(void) 1211{ 1212 return backgndpid != -1; 1213} 1214 1215 1216pid_t 1217backgndpidval(void) 1218{ 1219 if (bgjob != NULL && !forcelocal) 1220 bgjob->remembered = 1; 1221 return backgndpid; 1222} 1223 1224/* 1225 * Return a string identifying a command (to be printed by the 1226 * jobs command. 1227 */ 1228 1229static char *cmdnextc; 1230static int cmdnleft; 1231#define MAXCMDTEXT 200 1232 1233char * 1234commandtext(union node *n) 1235{ 1236 char *name; 1237 1238 cmdnextc = name = ckmalloc(MAXCMDTEXT); 1239 cmdnleft = MAXCMDTEXT - 4; 1240 cmdtxt(n); 1241 *cmdnextc = '\0'; 1242 return name; 1243} 1244 1245 1246static void 1247cmdtxt(union node *n) 1248{ 1249 union node *np; 1250 struct nodelist *lp; 1251 const char *p; 1252 int i; 1253 char s[2]; 1254 1255 if (n == NULL) 1256 return; 1257 switch (n->type) { 1258 case NSEMI: 1259 cmdtxt(n->nbinary.ch1); 1260 cmdputs("; "); 1261 cmdtxt(n->nbinary.ch2); 1262 break; 1263 case NAND: 1264 cmdtxt(n->nbinary.ch1); 1265 cmdputs(" && "); 1266 cmdtxt(n->nbinary.ch2); 1267 break; 1268 case NOR: 1269 cmdtxt(n->nbinary.ch1); 1270 cmdputs(" || "); 1271 cmdtxt(n->nbinary.ch2); 1272 break; 1273 case NPIPE: 1274 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1275 cmdtxt(lp->n); 1276 if (lp->next) 1277 cmdputs(" | "); 1278 } 1279 break; 1280 case NSUBSHELL: 1281 cmdputs("("); 1282 cmdtxt(n->nredir.n); 1283 cmdputs(")"); 1284 break; 1285 case NREDIR: 1286 case NBACKGND: 1287 cmdtxt(n->nredir.n); 1288 break; 1289 case NIF: 1290 cmdputs("if "); 1291 cmdtxt(n->nif.test); 1292 cmdputs("; then "); 1293 cmdtxt(n->nif.ifpart); 1294 cmdputs("..."); 1295 break; 1296 case NWHILE: 1297 cmdputs("while "); 1298 goto until; 1299 case NUNTIL: 1300 cmdputs("until "); 1301until: 1302 cmdtxt(n->nbinary.ch1); 1303 cmdputs("; do "); 1304 cmdtxt(n->nbinary.ch2); 1305 cmdputs("; done"); 1306 break; 1307 case NFOR: 1308 cmdputs("for "); 1309 cmdputs(n->nfor.var); 1310 cmdputs(" in ..."); 1311 break; 1312 case NCASE: 1313 cmdputs("case "); 1314 cmdputs(n->ncase.expr->narg.text); 1315 cmdputs(" in ..."); 1316 break; 1317 case NDEFUN: 1318 cmdputs(n->narg.text); 1319 cmdputs("() ..."); 1320 break; 1321 case NNOT: 1322 cmdputs("! "); 1323 cmdtxt(n->nnot.com); 1324 break; 1325 case NCMD: 1326 for (np = n->ncmd.args ; np ; np = np->narg.next) { 1327 cmdtxt(np); 1328 if (np->narg.next) 1329 cmdputs(" "); 1330 } 1331 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 1332 cmdputs(" "); 1333 cmdtxt(np); 1334 } 1335 break; 1336 case NARG: 1337 cmdputs(n->narg.text); 1338 break; 1339 case NTO: 1340 p = ">"; i = 1; goto redir; 1341 case NAPPEND: 1342 p = ">>"; i = 1; goto redir; 1343 case NTOFD: 1344 p = ">&"; i = 1; goto redir; 1345 case NCLOBBER: 1346 p = ">|"; i = 1; goto redir; 1347 case NFROM: 1348 p = "<"; i = 0; goto redir; 1349 case NFROMTO: 1350 p = "<>"; i = 0; goto redir; 1351 case NFROMFD: 1352 p = "<&"; i = 0; goto redir; 1353redir: 1354 if (n->nfile.fd != i) { 1355 s[0] = n->nfile.fd + '0'; 1356 s[1] = '\0'; 1357 cmdputs(s); 1358 } 1359 cmdputs(p); 1360 if (n->type == NTOFD || n->type == NFROMFD) { 1361 if (n->ndup.dupfd >= 0) 1362 s[0] = n->ndup.dupfd + '0'; 1363 else 1364 s[0] = '-'; 1365 s[1] = '\0'; 1366 cmdputs(s); 1367 } else { 1368 cmdtxt(n->nfile.fname); 1369 } 1370 break; 1371 case NHERE: 1372 case NXHERE: 1373 cmdputs("<<..."); 1374 break; 1375 default: 1376 cmdputs("???"); 1377 break; 1378 } 1379} 1380 1381 1382 1383static void 1384cmdputs(const char *s) 1385{ 1386 const char *p; 1387 char *q; 1388 char c; 1389 int subtype = 0; 1390 1391 if (cmdnleft <= 0) 1392 return; 1393 p = s; 1394 q = cmdnextc; 1395 while ((c = *p++) != '\0') { 1396 if (c == CTLESC) 1397 *q++ = *p++; 1398 else if (c == CTLVAR) { 1399 *q++ = '$'; 1400 if (--cmdnleft > 0) 1401 *q++ = '{'; 1402 subtype = *p++; 1403 if ((subtype & VSTYPE) == VSLENGTH && --cmdnleft > 0) 1404 *q++ = '#'; 1405 } else if (c == '=' && subtype != 0) { 1406 *q = "}-+?=##%%\0X"[(subtype & VSTYPE) - VSNORMAL]; 1407 if (*q) 1408 q++; 1409 else 1410 cmdnleft++; 1411 if (((subtype & VSTYPE) == VSTRIMLEFTMAX || 1412 (subtype & VSTYPE) == VSTRIMRIGHTMAX) && 1413 --cmdnleft > 0) 1414 *q = q[-1], q++; 1415 subtype = 0; 1416 } else if (c == CTLENDVAR) { 1417 *q++ = '}'; 1418 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) { 1419 cmdnleft -= 5; 1420 if (cmdnleft > 0) { 1421 *q++ = '$'; 1422 *q++ = '('; 1423 *q++ = '.'; 1424 *q++ = '.'; 1425 *q++ = '.'; 1426 *q++ = ')'; 1427 } 1428 } else if (c == CTLARI) { 1429 cmdnleft -= 2; 1430 if (cmdnleft > 0) { 1431 *q++ = '$'; 1432 *q++ = '('; 1433 *q++ = '('; 1434 } 1435 p++; 1436 } else if (c == CTLENDARI) { 1437 if (--cmdnleft > 0) { 1438 *q++ = ')'; 1439 *q++ = ')'; 1440 } 1441 } else if (c == CTLQUOTEMARK || c == CTLQUOTEEND) 1442 cmdnleft++; /* ignore */ 1443 else 1444 *q++ = c; 1445 if (--cmdnleft <= 0) { 1446 *q++ = '.'; 1447 *q++ = '.'; 1448 *q++ = '.'; 1449 break; 1450 } 1451 } 1452 cmdnextc = q; 1453} 1454