jobs.c revision 277973
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD: head/bin/sh/jobs.c 277973 2015-01-31 13:53:29Z jilles $"); 401556Srgrimes 41213775Sjhb#include <sys/ioctl.h> 42213775Sjhb#include <sys/param.h> 43213775Sjhb#include <sys/resource.h> 44213775Sjhb#include <sys/time.h> 45213775Sjhb#include <sys/wait.h> 46213775Sjhb#include <errno.h> 4717987Speter#include <fcntl.h> 48213775Sjhb#include <paths.h> 4917987Speter#include <signal.h> 50213925Sjilles#include <stddef.h> 51213775Sjhb#include <stdlib.h> 5217987Speter#include <unistd.h> 5317987Speter 541556Srgrimes#include "shell.h" 551556Srgrimes#if JOBS 5617987Speter#include <termios.h> 571556Srgrimes#undef CEOF /* syntax.h redefines this */ 581556Srgrimes#endif 5917987Speter#include "redir.h" 60230998Sjilles#include "exec.h" 6117987Speter#include "show.h" 621556Srgrimes#include "main.h" 631556Srgrimes#include "parser.h" 641556Srgrimes#include "nodes.h" 651556Srgrimes#include "jobs.h" 661556Srgrimes#include "options.h" 671556Srgrimes#include "trap.h" 681556Srgrimes#include "syntax.h" 691556Srgrimes#include "input.h" 701556Srgrimes#include "output.h" 711556Srgrimes#include "memalloc.h" 721556Srgrimes#include "error.h" 731556Srgrimes#include "mystring.h" 74223024Sjilles#include "var.h" 75223060Sjilles#include "builtins.h" 761556Srgrimes 771556Srgrimes 78213760Sobrienstatic struct job *jobtab; /* array of jobs */ 79213760Sobrienstatic int njobs; /* size of array */ 80253658Sjillesstatic pid_t backgndpid = -1; /* pid of last background process */ 81253658Sjillesstatic struct job *bgjob = NULL; /* last background process */ 821556Srgrimes#if JOBS 83213760Sobrienstatic struct job *jobmru; /* most recently used job list */ 84213760Sobrienstatic pid_t initialpgrp; /* pgrp of shell on invocation */ 851556Srgrimes#endif 8699762Stjrstatic int ttyfd = -1; 871556Srgrimes 88238888Sjilles/* mode flags for dowait */ 89238888Sjilles#define DOWAIT_BLOCK 0x1 /* wait until a child exits */ 90277973Sjilles#define DOWAIT_SIG 0x2 /* if DOWAIT_BLOCK, abort on signal */ 91277973Sjilles#define DOWAIT_SIG_TRAP 0x4 /* if DOWAIT_SIG, abort on trapped signal only */ 92238888Sjilles 9320425Ssteve#if JOBS 94213811Sobrienstatic void restartjob(struct job *); 9520425Ssteve#endif 96213811Sobrienstatic void freejob(struct job *); 97251429Sjillesstatic int waitcmdloop(struct job *); 98263195Sjillesstatic struct job *getjob_nonotfound(const char *); 99263195Sjillesstatic struct job *getjob(const char *); 100263206Sjillespid_t killjob(const char *, int); 101213811Sobrienstatic pid_t dowait(int, struct job *); 102213811Sobrienstatic void checkzombies(void); 103213811Sobrienstatic void cmdtxt(union node *); 104213811Sobrienstatic void cmdputs(const char *); 10597659Stjr#if JOBS 106213811Sobrienstatic void setcurjob(struct job *); 107213811Sobrienstatic void deljob(struct job *); 108213811Sobrienstatic struct job *getcurjob(struct job *); 10997659Stjr#endif 110216217Sjillesstatic void printjobcmd(struct job *); 111216217Sjillesstatic void showjob(struct job *, int); 1121556Srgrimes 1131556Srgrimes 1141556Srgrimes/* 1151556Srgrimes * Turn job control on and off. 1161556Srgrimes */ 1171556Srgrimes 118253658Sjillesstatic int jobctl; 1191556Srgrimes 12020425Ssteve#if JOBS 121271144Sjillesstatic void 122271144Sjillesjobctl_notty(void) 123271144Sjilles{ 124271144Sjilles if (ttyfd >= 0) { 125271144Sjilles close(ttyfd); 126271144Sjilles ttyfd = -1; 127271144Sjilles } 128271144Sjilles if (!iflag) { 129271144Sjilles setsignal(SIGTSTP); 130271144Sjilles setsignal(SIGTTOU); 131271144Sjilles setsignal(SIGTTIN); 132271144Sjilles jobctl = 1; 133271144Sjilles return; 134271144Sjilles } 135271144Sjilles out2fmt_flush("sh: can't access tty; job control turned off\n"); 136271144Sjilles mflag = 0; 137271144Sjilles} 138271144Sjilles 1391556Srgrimesvoid 14090111Simpsetjobctl(int on) 14117987Speter{ 14299762Stjr int i; 1431556Srgrimes 1441556Srgrimes if (on == jobctl || rootshell == 0) 1451556Srgrimes return; 1461556Srgrimes if (on) { 14799762Stjr if (ttyfd != -1) 14899762Stjr close(ttyfd); 149250267Sjilles if ((ttyfd = open(_PATH_TTY, O_RDWR | O_CLOEXEC)) < 0) { 15099762Stjr i = 0; 15199762Stjr while (i <= 2 && !isatty(i)) 15299762Stjr i++; 153250267Sjilles if (i > 2 || 154271144Sjilles (ttyfd = fcntl(i, F_DUPFD_CLOEXEC, 10)) < 0) { 155271144Sjilles jobctl_notty(); 156271144Sjilles return; 157271144Sjilles } 15899762Stjr } 159109927Stjr if (ttyfd < 10) { 160109927Stjr /* 161109927Stjr * Keep our TTY file descriptor out of the way of 162109927Stjr * the user's redirections. 163109927Stjr */ 164250267Sjilles if ((i = fcntl(ttyfd, F_DUPFD_CLOEXEC, 10)) < 0) { 165271144Sjilles jobctl_notty(); 166271144Sjilles return; 167109927Stjr } 168109927Stjr close(ttyfd); 169109927Stjr ttyfd = i; 170109927Stjr } 1711556Srgrimes do { /* while we are in the background */ 17299762Stjr initialpgrp = tcgetpgrp(ttyfd); 17320425Ssteve if (initialpgrp < 0) { 174271144Sjilles jobctl_notty(); 1751556Srgrimes return; 1761556Srgrimes } 177216400Sjilles if (initialpgrp != getpgrp()) { 178271144Sjilles if (!iflag) { 179271144Sjilles initialpgrp = -1; 180271144Sjilles jobctl_notty(); 181271144Sjilles return; 182271144Sjilles } 183216400Sjilles kill(0, SIGTTIN); 1841556Srgrimes continue; 1851556Srgrimes } 1861556Srgrimes } while (0); 1871556Srgrimes setsignal(SIGTSTP); 1881556Srgrimes setsignal(SIGTTOU); 1891556Srgrimes setsignal(SIGTTIN); 19017987Speter setpgid(0, rootpid); 19199762Stjr tcsetpgrp(ttyfd, rootpid); 1921556Srgrimes } else { /* turning job control off */ 19317987Speter setpgid(0, initialpgrp); 194271144Sjilles if (ttyfd >= 0) { 195271144Sjilles tcsetpgrp(ttyfd, initialpgrp); 196271144Sjilles close(ttyfd); 197271144Sjilles ttyfd = -1; 198271144Sjilles } 1991556Srgrimes setsignal(SIGTSTP); 2001556Srgrimes setsignal(SIGTTOU); 2011556Srgrimes setsignal(SIGTTIN); 2021556Srgrimes } 2031556Srgrimes jobctl = on; 2041556Srgrimes} 20520425Ssteve#endif 2061556Srgrimes 2071556Srgrimes 2081556Srgrimes#if JOBS 20917987Speterint 210254413Sjillesfgcmd(int argc __unused, char **argv __unused) 21117987Speter{ 2121556Srgrimes struct job *jp; 213100308Stjr pid_t pgrp; 2141556Srgrimes int status; 2151556Srgrimes 216254413Sjilles nextopt(""); 217254413Sjilles jp = getjob(*argptr); 2181556Srgrimes if (jp->jobctl == 0) 2191556Srgrimes error("job not created under job control"); 220216217Sjilles printjobcmd(jp); 22196933Stjr flushout(&output); 2221556Srgrimes pgrp = jp->ps[0].pid; 223271144Sjilles if (ttyfd >= 0) 224271144Sjilles tcsetpgrp(ttyfd, pgrp); 2251556Srgrimes restartjob(jp); 226100305Stjr jp->foreground = 1; 2271556Srgrimes INTOFF; 22845916Scracauer status = waitforjob(jp, (int *)NULL); 2291556Srgrimes INTON; 2301556Srgrimes return status; 2311556Srgrimes} 2321556Srgrimes 2331556Srgrimes 23417987Speterint 23590111Simpbgcmd(int argc, char **argv) 23617987Speter{ 2371556Srgrimes struct job *jp; 2381556Srgrimes 239254413Sjilles nextopt(""); 2401556Srgrimes do { 241254413Sjilles jp = getjob(*argptr); 2421556Srgrimes if (jp->jobctl == 0) 2431556Srgrimes error("job not created under job control"); 24496933Stjr if (jp->state == JOBDONE) 24596933Stjr continue; 2461556Srgrimes restartjob(jp); 247100305Stjr jp->foreground = 0; 248216400Sjilles out1fmt("[%td] ", jp - jobtab + 1); 249216217Sjilles printjobcmd(jp); 250254413Sjilles } while (*argptr != NULL && *++argptr != NULL); 2511556Srgrimes return 0; 2521556Srgrimes} 2531556Srgrimes 2541556Srgrimes 255213811Sobrienstatic void 25690111Simprestartjob(struct job *jp) 25717987Speter{ 2581556Srgrimes struct procstat *ps; 2591556Srgrimes int i; 2601556Srgrimes 2611556Srgrimes if (jp->state == JOBDONE) 2621556Srgrimes return; 26397660Stjr setcurjob(jp); 2641556Srgrimes INTOFF; 265216400Sjilles kill(-jp->ps[0].pid, SIGCONT); 2661556Srgrimes for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 26726104Ssteve if (WIFSTOPPED(ps->status)) { 2681556Srgrimes ps->status = -1; 2691556Srgrimes jp->state = 0; 2701556Srgrimes } 2711556Srgrimes } 2721556Srgrimes INTON; 2731556Srgrimes} 2741556Srgrimes#endif 2751556Srgrimes 2761556Srgrimes 2771556Srgrimesint 278240541Sjillesjobscmd(int argc __unused, char *argv[] __unused) 27917987Speter{ 28097669Stjr char *id; 281163085Sstefanf int ch, mode; 28297669Stjr 283163085Sstefanf mode = SHOWJOBS_DEFAULT; 284240541Sjilles while ((ch = nextopt("lps")) != '\0') { 28597669Stjr switch (ch) { 28697669Stjr case 'l': 287163085Sstefanf mode = SHOWJOBS_VERBOSE; 28897669Stjr break; 289163085Sstefanf case 'p': 290163085Sstefanf mode = SHOWJOBS_PGIDS; 291163085Sstefanf break; 29297669Stjr case 's': 293163085Sstefanf mode = SHOWJOBS_PIDS; 29497669Stjr break; 29597669Stjr } 29697669Stjr } 29797669Stjr 298240541Sjilles if (*argptr == NULL) 299163085Sstefanf showjobs(0, mode); 30097669Stjr else 301240541Sjilles while ((id = *argptr++) != NULL) 302216217Sjilles showjob(getjob(id), mode); 30397669Stjr 30497669Stjr return (0); 3051556Srgrimes} 3061556Srgrimes 307213811Sobrienstatic void 308216217Sjillesprintjobcmd(struct job *jp) 30997663Stjr{ 310216217Sjilles struct procstat *ps; 311216217Sjilles int i; 312216217Sjilles 313216217Sjilles for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 314216217Sjilles out1str(ps->cmd); 315216217Sjilles if (i > 0) 316216217Sjilles out1str(" | "); 317216217Sjilles } 318216217Sjilles out1c('\n'); 319216217Sjilles} 320216217Sjilles 321216217Sjillesstatic void 322216217Sjillesshowjob(struct job *jp, int mode) 323216217Sjilles{ 32497663Stjr char s[64]; 325216217Sjilles char statestr[64]; 326244682Sjilles const char *sigstr; 32797663Stjr struct procstat *ps; 32897669Stjr struct job *j; 32997669Stjr int col, curr, i, jobno, prev, procno; 33097669Stjr char c; 3311556Srgrimes 332163085Sstefanf procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs; 33397663Stjr jobno = jp - jobtab + 1; 33497669Stjr curr = prev = 0; 33597669Stjr#if JOBS 33697669Stjr if ((j = getcurjob(NULL)) != NULL) { 33797669Stjr curr = j - jobtab + 1; 33897669Stjr if ((j = getcurjob(j)) != NULL) 33997669Stjr prev = j - jobtab + 1; 34097669Stjr } 34197669Stjr#endif 342216217Sjilles ps = jp->ps + jp->nprocs - 1; 343216217Sjilles if (jp->state == 0) { 344216217Sjilles strcpy(statestr, "Running"); 345216217Sjilles#if JOBS 346216217Sjilles } else if (jp->state == JOBSTOPPED) { 347216217Sjilles while (!WIFSTOPPED(ps->status) && ps > jp->ps) 348216217Sjilles ps--; 349216217Sjilles if (WIFSTOPPED(ps->status)) 350216217Sjilles i = WSTOPSIG(ps->status); 351216217Sjilles else 352216217Sjilles i = -1; 353244682Sjilles sigstr = strsignal(i); 354244682Sjilles if (sigstr != NULL) 355244682Sjilles strcpy(statestr, sigstr); 356216217Sjilles else 357216217Sjilles strcpy(statestr, "Suspended"); 358216217Sjilles#endif 359216217Sjilles } else if (WIFEXITED(ps->status)) { 360216217Sjilles if (WEXITSTATUS(ps->status) == 0) 361216217Sjilles strcpy(statestr, "Done"); 362216217Sjilles else 363216220Sjilles fmtstr(statestr, 64, "Done(%d)", 364216217Sjilles WEXITSTATUS(ps->status)); 365216217Sjilles } else { 366216217Sjilles i = WTERMSIG(ps->status); 367244682Sjilles sigstr = strsignal(i); 368244682Sjilles if (sigstr != NULL) 369244682Sjilles strcpy(statestr, sigstr); 370216217Sjilles else 371244682Sjilles strcpy(statestr, "Unknown signal"); 372216217Sjilles if (WCOREDUMP(ps->status)) 373216217Sjilles strcat(statestr, " (core dumped)"); 374216217Sjilles } 375216217Sjilles 376272575Sjilles for (ps = jp->ps ; procno > 0 ; ps++, procno--) { /* for each process */ 377163085Sstefanf if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) { 378216199Sjilles out1fmt("%d\n", (int)ps->pid); 379272575Sjilles continue; 38097669Stjr } 381216217Sjilles if (mode != SHOWJOBS_VERBOSE && ps != jp->ps) 382272575Sjilles continue; 38397819Stjr if (jobno == curr && ps == jp->ps) 38497669Stjr c = '+'; 38597819Stjr else if (jobno == prev && ps == jp->ps) 38697669Stjr c = '-'; 38797669Stjr else 38897669Stjr c = ' '; 38997663Stjr if (ps == jp->ps) 39097669Stjr fmtstr(s, 64, "[%d] %c ", jobno, c); 39197663Stjr else 39297816Stjr fmtstr(s, 64, " %c ", c); 39397663Stjr out1str(s); 39497663Stjr col = strlen(s); 395163085Sstefanf if (mode == SHOWJOBS_VERBOSE) { 396100308Stjr fmtstr(s, 64, "%d ", (int)ps->pid); 39797669Stjr out1str(s); 39897669Stjr col += strlen(s); 39997669Stjr } 400216217Sjilles if (ps == jp->ps) { 401216217Sjilles out1str(statestr); 402216217Sjilles col += strlen(statestr); 40397663Stjr } 40497663Stjr do { 40597663Stjr out1c(' '); 40697663Stjr col++; 40797663Stjr } while (col < 30); 408216217Sjilles if (mode == SHOWJOBS_VERBOSE) { 409216217Sjilles out1str(ps->cmd); 410216217Sjilles out1c('\n'); 411216217Sjilles } else 412216217Sjilles printjobcmd(jp); 41397663Stjr } 41497663Stjr} 41597663Stjr 4161556Srgrimes/* 4171556Srgrimes * Print a list of jobs. If "change" is nonzero, only print jobs whose 4181556Srgrimes * statuses have changed since the last call to showjobs. 4191556Srgrimes * 4201556Srgrimes * If the shell is interrupted in the process of creating a job, the 4211556Srgrimes * result may be a job structure containing zero processes. Such structures 4221556Srgrimes * will be freed here. 4231556Srgrimes */ 4241556Srgrimes 4251556Srgrimesvoid 426163085Sstefanfshowjobs(int change, int mode) 42717987Speter{ 4281556Srgrimes int jobno; 4291556Srgrimes struct job *jp; 4301556Srgrimes 4311556Srgrimes TRACE(("showjobs(%d) called\n", change)); 432208489Sjilles checkzombies(); 4331556Srgrimes for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 4341556Srgrimes if (! jp->used) 4351556Srgrimes continue; 4361556Srgrimes if (jp->nprocs == 0) { 4371556Srgrimes freejob(jp); 4381556Srgrimes continue; 4391556Srgrimes } 4401556Srgrimes if (change && ! jp->changed) 4411556Srgrimes continue; 442216217Sjilles showjob(jp, mode); 443249984Sjilles if (mode == SHOWJOBS_DEFAULT || mode == SHOWJOBS_VERBOSE) { 444249984Sjilles jp->changed = 0; 445249984Sjilles /* Hack: discard jobs for which $! has not been 446249984Sjilles * referenced in interactive mode when they terminate. 447249984Sjilles */ 448249984Sjilles if (jp->state == JOBDONE && !jp->remembered && 449249984Sjilles (iflag || jp != bgjob)) { 450249984Sjilles freejob(jp); 451249984Sjilles } 4521556Srgrimes } 4531556Srgrimes } 4541556Srgrimes} 4551556Srgrimes 4561556Srgrimes 4571556Srgrimes/* 4581556Srgrimes * Mark a job structure as unused. 4591556Srgrimes */ 4601556Srgrimes 461213811Sobrienstatic void 46290111Simpfreejob(struct job *jp) 46390111Simp{ 4641556Srgrimes struct procstat *ps; 4651556Srgrimes int i; 4661556Srgrimes 4671556Srgrimes INTOFF; 468209600Sjilles if (bgjob == jp) 469209600Sjilles bgjob = NULL; 4701556Srgrimes for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 4711556Srgrimes if (ps->cmd != nullstr) 4721556Srgrimes ckfree(ps->cmd); 4731556Srgrimes } 4741556Srgrimes if (jp->ps != &jp->ps0) 4751556Srgrimes ckfree(jp->ps); 4761556Srgrimes jp->used = 0; 4771556Srgrimes#if JOBS 47897659Stjr deljob(jp); 4791556Srgrimes#endif 4801556Srgrimes INTON; 4811556Srgrimes} 4821556Srgrimes 4831556Srgrimes 4841556Srgrimes 4851556Srgrimesint 486248349Sjilleswaitcmd(int argc __unused, char **argv __unused) 48717987Speter{ 4881556Srgrimes struct job *job; 489251429Sjilles int retval; 4901556Srgrimes 491248349Sjilles nextopt(""); 492251429Sjilles if (*argptr == NULL) 493251429Sjilles return (waitcmdloop(NULL)); 494251429Sjilles 495251429Sjilles do { 496251430Sjilles job = getjob_nonotfound(*argptr); 497251430Sjilles if (job == NULL) 498251430Sjilles retval = 127; 499251430Sjilles else 500251430Sjilles retval = waitcmdloop(job); 501251429Sjilles argptr++; 502251429Sjilles } while (*argptr != NULL); 50338536Scracauer 504251429Sjilles return (retval); 505251429Sjilles} 506251429Sjilles 507251429Sjillesstatic int 508251429Sjilleswaitcmdloop(struct job *job) 509251429Sjilles{ 510255157Sjilles int status, retval, sig; 511251429Sjilles struct job *jp; 512251429Sjilles 51338536Scracauer /* 51438536Scracauer * Loop until a process is terminated or stopped, or a SIGINT is 51538536Scracauer * received. 51638536Scracauer */ 51738536Scracauer 51838536Scracauer do { 5191556Srgrimes if (job != NULL) { 520254767Sjilles if (job->state == JOBDONE) { 5211556Srgrimes status = job->ps[job->nprocs - 1].status; 52226104Ssteve if (WIFEXITED(status)) 52326104Ssteve retval = WEXITSTATUS(status); 5241556Srgrimes else 52526104Ssteve retval = WTERMSIG(status) + 128; 526209600Sjilles if (! iflag || ! job->changed) 5271556Srgrimes freejob(job); 528209600Sjilles else { 529209600Sjilles job->remembered = 0; 530209600Sjilles if (job == bgjob) 531209600Sjilles bgjob = NULL; 532209600Sjilles } 53326104Ssteve return retval; 5341556Srgrimes } 5351556Srgrimes } else { 536209600Sjilles for (jp = jobtab ; jp < jobtab + njobs; jp++) 537209600Sjilles if (jp->used && jp->state == JOBDONE) { 538209600Sjilles if (! iflag || ! jp->changed) 539209600Sjilles freejob(jp); 540209600Sjilles else { 541209600Sjilles jp->remembered = 0; 542209600Sjilles if (jp == bgjob) 543209600Sjilles bgjob = NULL; 544209600Sjilles } 545209600Sjilles } 5461556Srgrimes for (jp = jobtab ; ; jp++) { 5471556Srgrimes if (jp >= jobtab + njobs) { /* no running procs */ 5481556Srgrimes return 0; 5491556Srgrimes } 5501556Srgrimes if (jp->used && jp->state == 0) 5511556Srgrimes break; 5521556Srgrimes } 5531556Srgrimes } 554238888Sjilles } while (dowait(DOWAIT_BLOCK | DOWAIT_SIG, (struct job *)NULL) != -1); 55538521Scracauer 556255157Sjilles sig = pendingsig_waitcmd; 557255157Sjilles pendingsig_waitcmd = 0; 558255157Sjilles return sig + 128; 5591556Srgrimes} 5601556Srgrimes 5611556Srgrimes 5621556Srgrimes 56317987Speterint 564254413Sjillesjobidcmd(int argc __unused, char **argv __unused) 56517987Speter{ 5661556Srgrimes struct job *jp; 5671556Srgrimes int i; 5681556Srgrimes 569254413Sjilles nextopt(""); 570254413Sjilles jp = getjob(*argptr); 5711556Srgrimes for (i = 0 ; i < jp->nprocs ; ) { 572100308Stjr out1fmt("%d", (int)jp->ps[i].pid); 5731556Srgrimes out1c(++i < jp->nprocs? ' ' : '\n'); 5741556Srgrimes } 5751556Srgrimes return 0; 5761556Srgrimes} 5771556Srgrimes 5781556Srgrimes 5791556Srgrimes 5801556Srgrimes/* 5811556Srgrimes * Convert a job name to a job structure. 5821556Srgrimes */ 5831556Srgrimes 584213811Sobrienstatic struct job * 585263195Sjillesgetjob_nonotfound(const char *name) 58690111Simp{ 5871556Srgrimes int jobno; 58897688Stjr struct job *found, *jp; 589268920Sjilles size_t namelen; 590100308Stjr pid_t pid; 5911556Srgrimes int i; 5921556Srgrimes 5931556Srgrimes if (name == NULL) { 5941556Srgrimes#if JOBS 595273152Sjilles name = "%+"; 5961556Srgrimes#else 5971556Srgrimes error("No current job"); 5981556Srgrimes#endif 599273152Sjilles } 600273152Sjilles if (name[0] == '%') { 6011556Srgrimes if (is_digit(name[1])) { 6021556Srgrimes jobno = number(name + 1); 6031556Srgrimes if (jobno > 0 && jobno <= njobs 6041556Srgrimes && jobtab[jobno - 1].used != 0) 6051556Srgrimes return &jobtab[jobno - 1]; 6061556Srgrimes#if JOBS 607273152Sjilles } else if ((name[1] == '%' || name[1] == '+') && 608273152Sjilles name[2] == '\0') { 609273152Sjilles if ((jp = getcurjob(NULL)) == NULL) 610273152Sjilles error("No current job"); 611273152Sjilles return (jp); 61297688Stjr } else if (name[1] == '-' && name[2] == '\0') { 61397688Stjr if ((jp = getcurjob(NULL)) == NULL || 61497688Stjr (jp = getcurjob(jp)) == NULL) 61597688Stjr error("No previous job"); 61697688Stjr return (jp); 6171556Srgrimes#endif 61897688Stjr } else if (name[1] == '?') { 61997688Stjr found = NULL; 62097688Stjr for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 62197688Stjr if (jp->used && jp->nprocs > 0 62297688Stjr && strstr(jp->ps[0].cmd, name + 2) != NULL) { 62397688Stjr if (found) 62497688Stjr error("%s: ambiguous", name); 62597688Stjr found = jp; 62697688Stjr } 62797688Stjr } 62897688Stjr if (found != NULL) 62997688Stjr return (found); 6301556Srgrimes } else { 631268920Sjilles namelen = strlen(name); 63297688Stjr found = NULL; 6331556Srgrimes for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 6341556Srgrimes if (jp->used && jp->nprocs > 0 635268920Sjilles && strncmp(jp->ps[0].cmd, name + 1, 636268920Sjilles namelen - 1) == 0) { 6371556Srgrimes if (found) 6381556Srgrimes error("%s: ambiguous", name); 6391556Srgrimes found = jp; 6401556Srgrimes } 6411556Srgrimes } 6421556Srgrimes if (found) 6431556Srgrimes return found; 6441556Srgrimes } 6451556Srgrimes } else if (is_number(name)) { 646100308Stjr pid = (pid_t)number(name); 6471556Srgrimes for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 6481556Srgrimes if (jp->used && jp->nprocs > 0 6491556Srgrimes && jp->ps[jp->nprocs - 1].pid == pid) 6501556Srgrimes return jp; 6511556Srgrimes } 6521556Srgrimes } 65317987Speter return NULL; 6541556Srgrimes} 6551556Srgrimes 6561556Srgrimes 657251430Sjillesstatic struct job * 658263195Sjillesgetjob(const char *name) 659251430Sjilles{ 660251430Sjilles struct job *jp; 661251430Sjilles 662251430Sjilles jp = getjob_nonotfound(name); 663251430Sjilles if (jp == NULL) 664251430Sjilles error("No such job: %s", name); 665251430Sjilles return (jp); 666251430Sjilles} 667251430Sjilles 668251430Sjilles 669263206Sjillesint 670263206Sjilleskilljob(const char *name, int sig) 671216629Sjilles{ 672216629Sjilles struct job *jp; 673263206Sjilles int i, ret; 6741556Srgrimes 675216629Sjilles jp = getjob(name); 676262931Sjilles if (jp->state == JOBDONE) 677262931Sjilles return 0; 678263206Sjilles if (jp->jobctl) 679263206Sjilles return kill(-jp->ps[0].pid, sig); 680263206Sjilles ret = -1; 681263206Sjilles errno = ESRCH; 682263206Sjilles for (i = 0; i < jp->nprocs; i++) 683263206Sjilles if (jp->ps[i].status == -1 || WIFSTOPPED(jp->ps[i].status)) { 684263206Sjilles if (kill(jp->ps[i].pid, sig) == 0) 685263206Sjilles ret = 0; 686263206Sjilles } else 687263206Sjilles ret = 0; 688263206Sjilles return ret; 689216629Sjilles} 690216629Sjilles 6911556Srgrimes/* 6921556Srgrimes * Return a new job structure, 6931556Srgrimes */ 6941556Srgrimes 6951556Srgrimesstruct job * 69690111Simpmakejob(union node *node __unused, int nprocs) 69717987Speter{ 6981556Srgrimes int i; 6991556Srgrimes struct job *jp; 7001556Srgrimes 7011556Srgrimes for (i = njobs, jp = jobtab ; ; jp++) { 7021556Srgrimes if (--i < 0) { 7031556Srgrimes INTOFF; 7041556Srgrimes if (njobs == 0) { 7051556Srgrimes jobtab = ckmalloc(4 * sizeof jobtab[0]); 70697664Stjr#if JOBS 70797659Stjr jobmru = NULL; 70897664Stjr#endif 7091556Srgrimes } else { 7101556Srgrimes jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 71117987Speter memcpy(jp, jobtab, njobs * sizeof jp[0]); 71297659Stjr#if JOBS 71397659Stjr /* Relocate `next' pointers and list head */ 71499760Stjr if (jobmru != NULL) 71599760Stjr jobmru = &jp[jobmru - jobtab]; 71697659Stjr for (i = 0; i < njobs; i++) 71797659Stjr if (jp[i].next != NULL) 71897659Stjr jp[i].next = &jp[jp[i].next - 71997659Stjr jobtab]; 72097659Stjr#endif 721209600Sjilles if (bgjob != NULL) 722209600Sjilles bgjob = &jp[bgjob - jobtab]; 72320425Ssteve /* Relocate `ps' pointers */ 72420425Ssteve for (i = 0; i < njobs; i++) 72520425Ssteve if (jp[i].ps == &jobtab[i].ps0) 72620425Ssteve jp[i].ps = &jp[i].ps0; 7271556Srgrimes ckfree(jobtab); 7281556Srgrimes jobtab = jp; 7291556Srgrimes } 7301556Srgrimes jp = jobtab + njobs; 731248980Sjilles for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0) 732248980Sjilles ; 7331556Srgrimes INTON; 7341556Srgrimes break; 7351556Srgrimes } 7361556Srgrimes if (jp->used == 0) 7371556Srgrimes break; 7381556Srgrimes } 7391556Srgrimes INTOFF; 7401556Srgrimes jp->state = 0; 7411556Srgrimes jp->used = 1; 7421556Srgrimes jp->changed = 0; 7431556Srgrimes jp->nprocs = 0; 744100305Stjr jp->foreground = 0; 745209600Sjilles jp->remembered = 0; 7461556Srgrimes#if JOBS 7471556Srgrimes jp->jobctl = jobctl; 74897659Stjr jp->next = NULL; 7491556Srgrimes#endif 7501556Srgrimes if (nprocs > 1) { 7511556Srgrimes jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 7521556Srgrimes } else { 7531556Srgrimes jp->ps = &jp->ps0; 7541556Srgrimes } 7551556Srgrimes INTON; 756213775Sjhb TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs, 75717987Speter jp - jobtab + 1)); 7581556Srgrimes return jp; 7598855Srgrimes} 7601556Srgrimes 76197659Stjr#if JOBS 762213811Sobrienstatic void 76397659Stjrsetcurjob(struct job *cj) 76497659Stjr{ 76597659Stjr struct job *jp, *prev; 7661556Srgrimes 76797659Stjr for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 76897659Stjr if (jp == cj) { 76997659Stjr if (prev != NULL) 77097659Stjr prev->next = jp->next; 77197659Stjr else 77297659Stjr jobmru = jp->next; 77397659Stjr jp->next = jobmru; 77497659Stjr jobmru = cj; 77597659Stjr return; 77697659Stjr } 77797659Stjr } 77897659Stjr cj->next = jobmru; 77997659Stjr jobmru = cj; 78097659Stjr} 78197659Stjr 782213811Sobrienstatic void 78397659Stjrdeljob(struct job *j) 78497659Stjr{ 78597659Stjr struct job *jp, *prev; 78697659Stjr 78797659Stjr for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 78897659Stjr if (jp == j) { 78997659Stjr if (prev != NULL) 79097659Stjr prev->next = jp->next; 79197659Stjr else 79297659Stjr jobmru = jp->next; 79397659Stjr return; 79497659Stjr } 79597659Stjr } 79697659Stjr} 79797659Stjr 7981556Srgrimes/* 79997659Stjr * Return the most recently used job that isn't `nj', and preferably one 80097659Stjr * that is stopped. 80197659Stjr */ 802213811Sobrienstatic struct job * 80397659Stjrgetcurjob(struct job *nj) 80497659Stjr{ 80597659Stjr struct job *jp; 80697659Stjr 80797659Stjr /* Try to find a stopped one.. */ 80897659Stjr for (jp = jobmru; jp != NULL; jp = jp->next) 80997659Stjr if (jp->used && jp != nj && jp->state == JOBSTOPPED) 81097659Stjr return (jp); 81197659Stjr /* Otherwise the most recently used job that isn't `nj' */ 81297659Stjr for (jp = jobmru; jp != NULL; jp = jp->next) 81397659Stjr if (jp->used && jp != nj) 81497659Stjr return (jp); 81597659Stjr 81697659Stjr return (NULL); 81797659Stjr} 81897659Stjr 81997659Stjr#endif 82097659Stjr 82197659Stjr/* 8221556Srgrimes * Fork of a subshell. If we are doing job control, give the subshell its 8231556Srgrimes * own process group. Jp is a job structure that the job is to be added to. 8241556Srgrimes * N is the command that will be evaluated by the child. Both jp and n may 8251556Srgrimes * be NULL. The mode parameter can be one of the following: 8261556Srgrimes * FORK_FG - Fork off a foreground process. 8271556Srgrimes * FORK_BG - Fork off a background process. 8281556Srgrimes * FORK_NOJOB - Like FORK_FG, but don't give the process its own 8291556Srgrimes * process group even if job control is on. 8301556Srgrimes * 8311556Srgrimes * When job control is turned off, background processes have their standard 8321556Srgrimes * input redirected to /dev/null (except for the second and later processes 8331556Srgrimes * in a pipeline). 8341556Srgrimes */ 8351556Srgrimes 836100308Stjrpid_t 83790111Simpforkshell(struct job *jp, union node *n, int mode) 83817987Speter{ 839100308Stjr pid_t pid; 840100308Stjr pid_t pgrp; 8411556Srgrimes 842213775Sjhb TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n, 84317987Speter mode)); 8441556Srgrimes INTOFF; 845216208Sjilles if (mode == FORK_BG && (jp == NULL || jp->nprocs == 0)) 846208489Sjilles checkzombies(); 847112341Stjr flushall(); 8481556Srgrimes pid = fork(); 8491556Srgrimes if (pid == -1) { 8501556Srgrimes TRACE(("Fork failed, errno=%d\n", errno)); 8511556Srgrimes INTON; 85253891Scracauer error("Cannot fork: %s", strerror(errno)); 8531556Srgrimes } 8541556Srgrimes if (pid == 0) { 8551556Srgrimes struct job *p; 8561556Srgrimes int wasroot; 8571556Srgrimes int i; 8581556Srgrimes 859100308Stjr TRACE(("Child shell %d\n", (int)getpid())); 8601556Srgrimes wasroot = rootshell; 8611556Srgrimes rootshell = 0; 862200998Sjilles handler = &main_handler; 8631556Srgrimes closescript(); 8641556Srgrimes INTON; 865223024Sjilles forcelocal = 0; 8661556Srgrimes clear_traps(); 8671556Srgrimes#if JOBS 8681556Srgrimes jobctl = 0; /* do job control only in root shell */ 8691556Srgrimes if (wasroot && mode != FORK_NOJOB && mflag) { 8701556Srgrimes if (jp == NULL || jp->nprocs == 0) 8711556Srgrimes pgrp = getpid(); 8721556Srgrimes else 8731556Srgrimes pgrp = jp->ps[0].pid; 874271144Sjilles if (setpgid(0, pgrp) == 0 && mode == FORK_FG && 875271144Sjilles ttyfd >= 0) { 8761556Srgrimes /*** this causes superfluous TIOCSPGRPS ***/ 87799762Stjr if (tcsetpgrp(ttyfd, pgrp) < 0) 87820425Ssteve error("tcsetpgrp failed, errno=%d", errno); 8791556Srgrimes } 8801556Srgrimes setsignal(SIGTSTP); 8811556Srgrimes setsignal(SIGTTOU); 8821556Srgrimes } else if (mode == FORK_BG) { 8831556Srgrimes ignoresig(SIGINT); 8841556Srgrimes ignoresig(SIGQUIT); 8851556Srgrimes if ((jp == NULL || jp->nprocs == 0) && 8861556Srgrimes ! fd0_redirected_p ()) { 8871556Srgrimes close(0); 88869793Sobrien if (open(_PATH_DEVNULL, O_RDONLY) != 0) 889222684Sjilles error("cannot open %s: %s", 89069793Sobrien _PATH_DEVNULL, strerror(errno)); 8911556Srgrimes } 8921556Srgrimes } 8931556Srgrimes#else 8941556Srgrimes if (mode == FORK_BG) { 8951556Srgrimes ignoresig(SIGINT); 8961556Srgrimes ignoresig(SIGQUIT); 8971556Srgrimes if ((jp == NULL || jp->nprocs == 0) && 8981556Srgrimes ! fd0_redirected_p ()) { 8991556Srgrimes close(0); 90069793Sobrien if (open(_PATH_DEVNULL, O_RDONLY) != 0) 901222684Sjilles error("cannot open %s: %s", 90269793Sobrien _PATH_DEVNULL, strerror(errno)); 9031556Srgrimes } 9041556Srgrimes } 9051556Srgrimes#endif 906102051Stjr INTOFF; 907102051Stjr for (i = njobs, p = jobtab ; --i >= 0 ; p++) 908102051Stjr if (p->used) 909102051Stjr freejob(p); 910102051Stjr INTON; 9111556Srgrimes if (wasroot && iflag) { 9121556Srgrimes setsignal(SIGINT); 9131556Srgrimes setsignal(SIGQUIT); 9141556Srgrimes setsignal(SIGTERM); 9151556Srgrimes } 9161556Srgrimes return pid; 9171556Srgrimes } 9181556Srgrimes if (rootshell && mode != FORK_NOJOB && mflag) { 9191556Srgrimes if (jp == NULL || jp->nprocs == 0) 9201556Srgrimes pgrp = pid; 9211556Srgrimes else 9221556Srgrimes pgrp = jp->ps[0].pid; 92317987Speter setpgid(pid, pgrp); 9241556Srgrimes } 925209600Sjilles if (mode == FORK_BG) { 926209600Sjilles if (bgjob != NULL && bgjob->state == JOBDONE && 927209600Sjilles !bgjob->remembered && !iflag) 928209600Sjilles freejob(bgjob); 9291556Srgrimes backgndpid = pid; /* set $! */ 930209600Sjilles bgjob = jp; 931209600Sjilles } 9321556Srgrimes if (jp) { 9331556Srgrimes struct procstat *ps = &jp->ps[jp->nprocs++]; 9341556Srgrimes ps->pid = pid; 9351556Srgrimes ps->status = -1; 9361556Srgrimes ps->cmd = nullstr; 9371556Srgrimes if (iflag && rootshell && n) 9381556Srgrimes ps->cmd = commandtext(n); 939100305Stjr jp->foreground = mode == FORK_FG; 94097659Stjr#if JOBS 94197659Stjr setcurjob(jp); 94297659Stjr#endif 9431556Srgrimes } 9441556Srgrimes INTON; 945100308Stjr TRACE(("In parent shell: child = %d\n", (int)pid)); 9461556Srgrimes return pid; 9471556Srgrimes} 9481556Srgrimes 9491556Srgrimes 950230998Sjillespid_t 951230998Sjillesvforkexecshell(struct job *jp, char **argv, char **envp, const char *path, int idx, int pip[2]) 952230998Sjilles{ 953230998Sjilles pid_t pid; 954230998Sjilles struct jmploc jmploc; 955230998Sjilles struct jmploc *savehandler; 9561556Srgrimes 957233792Sjilles TRACE(("vforkexecshell(%%%td, %s, %p) called\n", jp - jobtab, argv[0], 958233792Sjilles (void *)pip)); 959230998Sjilles INTOFF; 960230998Sjilles flushall(); 961230998Sjilles savehandler = handler; 962230998Sjilles pid = vfork(); 963230998Sjilles if (pid == -1) { 964230998Sjilles TRACE(("Vfork failed, errno=%d\n", errno)); 965230998Sjilles INTON; 966230998Sjilles error("Cannot fork: %s", strerror(errno)); 967230998Sjilles } 968230998Sjilles if (pid == 0) { 969230998Sjilles TRACE(("Child shell %d\n", (int)getpid())); 970230998Sjilles if (setjmp(jmploc.loc)) 971230998Sjilles _exit(exception == EXEXEC ? exerrno : 2); 972230998Sjilles if (pip != NULL) { 973230998Sjilles close(pip[0]); 974230998Sjilles if (pip[1] != 1) { 975230998Sjilles dup2(pip[1], 1); 976230998Sjilles close(pip[1]); 977230998Sjilles } 978230998Sjilles } 979230998Sjilles handler = &jmploc; 980230998Sjilles shellexec(argv, envp, path, idx); 981230998Sjilles } 982230998Sjilles handler = savehandler; 983230998Sjilles if (jp) { 984230998Sjilles struct procstat *ps = &jp->ps[jp->nprocs++]; 985230998Sjilles ps->pid = pid; 986230998Sjilles ps->status = -1; 987230998Sjilles ps->cmd = nullstr; 988230998Sjilles jp->foreground = 1; 989230998Sjilles#if JOBS 990230998Sjilles setcurjob(jp); 991230998Sjilles#endif 992230998Sjilles } 993230998Sjilles INTON; 994230998Sjilles TRACE(("In parent shell: child = %d\n", (int)pid)); 995230998Sjilles return pid; 996230998Sjilles} 997230998Sjilles 998230998Sjilles 9991556Srgrimes/* 10001556Srgrimes * Wait for job to finish. 10011556Srgrimes * 10021556Srgrimes * Under job control we have the problem that while a child process is 10031556Srgrimes * running interrupts generated by the user are sent to the child but not 10041556Srgrimes * to the shell. This means that an infinite loop started by an inter- 10051556Srgrimes * active user may be hard to kill. With job control turned off, an 10061556Srgrimes * interactive user may place an interactive program inside a loop. If 10071556Srgrimes * the interactive program catches interrupts, the user doesn't want 10081556Srgrimes * these interrupts to also abort the loop. The approach we take here 10091556Srgrimes * is to have the shell ignore interrupt signals while waiting for a 101046684Skris * foreground process to terminate, and then send itself an interrupt 10111556Srgrimes * signal if the child process was terminated by an interrupt signal. 10121556Srgrimes * Unfortunately, some programs want to do a bit of cleanup and then 10131556Srgrimes * exit on interrupt; unless these processes terminate themselves by 10141556Srgrimes * sending a signal to themselves (instead of calling exit) they will 10151556Srgrimes * confuse this approach. 10161556Srgrimes */ 10171556Srgrimes 10181556Srgrimesint 101990111Simpwaitforjob(struct job *jp, int *origstatus) 102045916Scracauer{ 10211556Srgrimes#if JOBS 1022208881Sjilles int propagate_int = jp->jobctl && jp->foreground; 10231556Srgrimes#endif 10241556Srgrimes int status; 10251556Srgrimes int st; 10261556Srgrimes 10271556Srgrimes INTOFF; 1028213775Sjhb TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1)); 102938950Scracauer while (jp->state == 0) 1030255157Sjilles if (dowait(DOWAIT_BLOCK | (Tflag ? DOWAIT_SIG | 1031277973Sjilles DOWAIT_SIG_TRAP : 0), jp) == -1) 103238950Scracauer dotrap(); 10331556Srgrimes#if JOBS 10341556Srgrimes if (jp->jobctl) { 1035271144Sjilles if (ttyfd >= 0 && tcsetpgrp(ttyfd, rootpid) < 0) 103620425Ssteve error("tcsetpgrp failed, errno=%d\n", errno); 10371556Srgrimes } 10381556Srgrimes if (jp->state == JOBSTOPPED) 103997659Stjr setcurjob(jp); 10401556Srgrimes#endif 10411556Srgrimes status = jp->ps[jp->nprocs - 1].status; 104245916Scracauer if (origstatus != NULL) 104345916Scracauer *origstatus = status; 10441556Srgrimes /* convert to 8 bits */ 104526104Ssteve if (WIFEXITED(status)) 104626104Ssteve st = WEXITSTATUS(status); 10471556Srgrimes#if JOBS 104826104Ssteve else if (WIFSTOPPED(status)) 104926104Ssteve st = WSTOPSIG(status) + 128; 10501556Srgrimes#endif 10511556Srgrimes else 105226104Ssteve st = WTERMSIG(status) + 128; 10531556Srgrimes if (! JOBS || jp->state == JOBDONE) 10541556Srgrimes freejob(jp); 105538521Scracauer if (int_pending()) { 1056216400Sjilles if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGINT) 105738521Scracauer CLEAR_PENDING_INT; 105838521Scracauer } 1059208881Sjilles#if JOBS 1060208881Sjilles else if (rootshell && iflag && propagate_int && 1061208881Sjilles WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 1062208881Sjilles kill(getpid(), SIGINT); 1063208881Sjilles#endif 10641556Srgrimes INTON; 10651556Srgrimes return st; 10661556Srgrimes} 10671556Srgrimes 10681556Srgrimes 1069238888Sjillesstatic void 1070248980Sjillesdummy_handler(int sig __unused) 1071238888Sjilles{ 1072238888Sjilles} 10731556Srgrimes 10741556Srgrimes/* 10751556Srgrimes * Wait for a process to terminate. 10761556Srgrimes */ 10771556Srgrimes 1078213811Sobrienstatic pid_t 1079238888Sjillesdowait(int mode, struct job *job) 108017987Speter{ 1081238888Sjilles struct sigaction sa, osa; 1082238888Sjilles sigset_t mask, omask; 1083100308Stjr pid_t pid; 10841556Srgrimes int status; 10851556Srgrimes struct procstat *sp; 10861556Srgrimes struct job *jp; 10871556Srgrimes struct job *thisjob; 1088244682Sjilles const char *sigstr; 10891556Srgrimes int done; 10901556Srgrimes int stopped; 109126104Ssteve int sig; 1092216217Sjilles int coredump; 1093238866Sjilles int wflags; 1094238888Sjilles int restore_sigchld; 10951556Srgrimes 1096246495Sdelphij TRACE(("dowait(%d, %p) called\n", mode, job)); 1097238888Sjilles restore_sigchld = 0; 1098238888Sjilles if ((mode & DOWAIT_SIG) != 0) { 1099238888Sjilles sigfillset(&mask); 1100238888Sjilles sigprocmask(SIG_BLOCK, &mask, &omask); 1101238888Sjilles INTOFF; 1102238888Sjilles if (!issigchldtrapped()) { 1103238888Sjilles restore_sigchld = 1; 1104238888Sjilles sa.sa_handler = dummy_handler; 1105238888Sjilles sa.sa_flags = 0; 1106238888Sjilles sigemptyset(&sa.sa_mask); 1107238888Sjilles sigaction(SIGCHLD, &sa, &osa); 1108238888Sjilles } 1109238888Sjilles } 11101556Srgrimes do { 1111238866Sjilles#if JOBS 1112238867Sjilles if (iflag) 1113238867Sjilles wflags = WUNTRACED | WCONTINUED; 1114238867Sjilles else 1115238866Sjilles#endif 1116238867Sjilles wflags = 0; 1117238888Sjilles if ((mode & (DOWAIT_BLOCK | DOWAIT_SIG)) != DOWAIT_BLOCK) 1118238866Sjilles wflags |= WNOHANG; 1119238866Sjilles pid = wait3(&status, wflags, (struct rusage *)NULL); 1120100308Stjr TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 1121238888Sjilles if (pid == 0 && (mode & DOWAIT_SIG) != 0) { 1122255157Sjilles pid = -1; 1123277973Sjilles if (((mode & DOWAIT_SIG_TRAP) != 0 ? 1124255157Sjilles pendingsig : pendingsig_waitcmd) != 0) { 1125255157Sjilles errno = EINTR; 1126255157Sjilles break; 1127255157Sjilles } 1128238888Sjilles sigsuspend(&omask); 1129238888Sjilles if (int_pending()) 1130238888Sjilles break; 1131238888Sjilles } 1132255157Sjilles } while (pid == -1 && errno == EINTR); 1133153417Smaxim if (pid == -1 && errno == ECHILD && job != NULL) 1134153417Smaxim job->state = JOBDONE; 1135238888Sjilles if ((mode & DOWAIT_SIG) != 0) { 1136238888Sjilles if (restore_sigchld) 1137238888Sjilles sigaction(SIGCHLD, &osa, NULL); 1138238888Sjilles sigprocmask(SIG_SETMASK, &omask, NULL); 1139238888Sjilles INTON; 1140238888Sjilles } 11411556Srgrimes if (pid <= 0) 11421556Srgrimes return pid; 11431556Srgrimes INTOFF; 11441556Srgrimes thisjob = NULL; 11451556Srgrimes for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 1146216208Sjilles if (jp->used && jp->nprocs > 0) { 11471556Srgrimes done = 1; 11481556Srgrimes stopped = 1; 11491556Srgrimes for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 11501556Srgrimes if (sp->pid == -1) 11511556Srgrimes continue; 1152263453Sjilles if (sp->pid == pid && (sp->status == -1 || 1153263453Sjilles WIFSTOPPED(sp->status))) { 115426104Ssteve TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 1155100308Stjr (int)pid, sp->status, 1156100308Stjr status)); 1157238865Sjilles if (WIFCONTINUED(status)) { 1158238865Sjilles sp->status = -1; 1159238865Sjilles jp->state = 0; 1160238865Sjilles } else 1161238865Sjilles sp->status = status; 11621556Srgrimes thisjob = jp; 11631556Srgrimes } 11641556Srgrimes if (sp->status == -1) 11651556Srgrimes stopped = 0; 116626104Ssteve else if (WIFSTOPPED(sp->status)) 11671556Srgrimes done = 0; 11681556Srgrimes } 11691556Srgrimes if (stopped) { /* stopped or done */ 11701556Srgrimes int state = done? JOBDONE : JOBSTOPPED; 11711556Srgrimes if (jp->state != state) { 1172213775Sjhb TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 11731556Srgrimes jp->state = state; 1174209600Sjilles if (jp != job) { 1175209600Sjilles if (done && !jp->remembered && 1176209600Sjilles !iflag && jp != bgjob) 1177209600Sjilles freejob(jp); 11781556Srgrimes#if JOBS 1179209600Sjilles else if (done) 1180209600Sjilles deljob(jp); 11811556Srgrimes#endif 1182209600Sjilles } 11831556Srgrimes } 11841556Srgrimes } 11851556Srgrimes } 11861556Srgrimes } 11871556Srgrimes INTON; 1188216217Sjilles if (!thisjob || thisjob->state == 0) 1189216217Sjilles ; 1190216217Sjilles else if ((!rootshell || !iflag || thisjob == job) && 1191216217Sjilles thisjob->foreground && thisjob->state != JOBSTOPPED) { 1192216217Sjilles sig = 0; 1193216217Sjilles coredump = 0; 1194216217Sjilles for (sp = thisjob->ps; sp < thisjob->ps + thisjob->nprocs; sp++) 1195216217Sjilles if (WIFSIGNALED(sp->status)) { 1196216217Sjilles sig = WTERMSIG(sp->status); 1197216217Sjilles coredump = WCOREDUMP(sp->status); 1198216217Sjilles } 1199216217Sjilles if (sig > 0 && sig != SIGINT && sig != SIGPIPE) { 1200244682Sjilles sigstr = strsignal(sig); 1201244682Sjilles if (sigstr != NULL) 1202244682Sjilles out2str(sigstr); 120326104Ssteve else 1204244682Sjilles out2str("Unknown signal"); 1205216217Sjilles if (coredump) 1206218105Sjilles out2str(" (core dumped)"); 1207218105Sjilles out2c('\n'); 1208218105Sjilles flushout(out2); 12091556Srgrimes } 12101556Srgrimes } else { 1211109627Stjr TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job)); 1212216217Sjilles thisjob->changed = 1; 12131556Srgrimes } 12141556Srgrimes return pid; 12151556Srgrimes} 12161556Srgrimes 12171556Srgrimes 12181556Srgrimes 12191556Srgrimes/* 12201556Srgrimes * return 1 if there are stopped jobs, otherwise 0 12211556Srgrimes */ 12221556Srgrimesint job_warning = 0; 12231556Srgrimesint 122490111Simpstoppedjobs(void) 12251556Srgrimes{ 122625222Ssteve int jobno; 122725222Ssteve struct job *jp; 12281556Srgrimes 12291556Srgrimes if (job_warning) 12301556Srgrimes return (0); 12311556Srgrimes for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 12321556Srgrimes if (jp->used == 0) 12331556Srgrimes continue; 12341556Srgrimes if (jp->state == JOBSTOPPED) { 1235199629Sjilles out2fmt_flush("You have stopped jobs.\n"); 12361556Srgrimes job_warning = 2; 12371556Srgrimes return (1); 12381556Srgrimes } 12391556Srgrimes } 12401556Srgrimes 12411556Srgrimes return (0); 12421556Srgrimes} 12431556Srgrimes 1244208489Sjilles 1245213811Sobrienstatic void 1246208489Sjillescheckzombies(void) 1247208489Sjilles{ 1248208489Sjilles while (njobs > 0 && dowait(0, NULL) > 0) 1249208489Sjilles ; 1250208489Sjilles} 1251208489Sjilles 1252208489Sjilles 1253209600Sjillesint 1254209600Sjillesbackgndpidset(void) 1255209600Sjilles{ 1256209600Sjilles return backgndpid != -1; 1257209600Sjilles} 1258209600Sjilles 1259209600Sjilles 1260209600Sjillespid_t 1261209600Sjillesbackgndpidval(void) 1262209600Sjilles{ 1263223024Sjilles if (bgjob != NULL && !forcelocal) 1264209600Sjilles bgjob->remembered = 1; 1265209600Sjilles return backgndpid; 1266209600Sjilles} 1267209600Sjilles 12681556Srgrimes/* 12691556Srgrimes * Return a string identifying a command (to be printed by the 12701556Srgrimes * jobs command. 12711556Srgrimes */ 12721556Srgrimes 1273213760Sobrienstatic char *cmdnextc; 1274213760Sobrienstatic int cmdnleft; 12751556Srgrimes#define MAXCMDTEXT 200 12761556Srgrimes 12771556Srgrimeschar * 127890111Simpcommandtext(union node *n) 127990111Simp{ 12801556Srgrimes char *name; 12811556Srgrimes 12821556Srgrimes cmdnextc = name = ckmalloc(MAXCMDTEXT); 12831556Srgrimes cmdnleft = MAXCMDTEXT - 4; 12841556Srgrimes cmdtxt(n); 12851556Srgrimes *cmdnextc = '\0'; 12861556Srgrimes return name; 12871556Srgrimes} 12881556Srgrimes 12891556Srgrimes 1290213811Sobrienstatic void 1291273152Sjillescmdtxtdogroup(union node *n) 1292273152Sjilles{ 1293273152Sjilles cmdputs("; do "); 1294273152Sjilles cmdtxt(n); 1295273152Sjilles cmdputs("; done"); 1296273152Sjilles} 1297273152Sjilles 1298273152Sjilles 1299273152Sjillesstatic void 1300273152Sjillescmdtxtredir(union node *n, const char *op, int deffd) 1301273152Sjilles{ 1302273152Sjilles char s[2]; 1303273152Sjilles 1304273152Sjilles if (n->nfile.fd != deffd) { 1305273152Sjilles s[0] = n->nfile.fd + '0'; 1306273152Sjilles s[1] = '\0'; 1307273152Sjilles cmdputs(s); 1308273152Sjilles } 1309273152Sjilles cmdputs(op); 1310273152Sjilles if (n->type == NTOFD || n->type == NFROMFD) { 1311273152Sjilles if (n->ndup.dupfd >= 0) 1312273152Sjilles s[0] = n->ndup.dupfd + '0'; 1313273152Sjilles else 1314273152Sjilles s[0] = '-'; 1315273152Sjilles s[1] = '\0'; 1316273152Sjilles cmdputs(s); 1317273152Sjilles } else { 1318273152Sjilles cmdtxt(n->nfile.fname); 1319273152Sjilles } 1320273152Sjilles} 1321273152Sjilles 1322273152Sjilles 1323273152Sjillesstatic void 132490111Simpcmdtxt(union node *n) 132590111Simp{ 13261556Srgrimes union node *np; 13271556Srgrimes struct nodelist *lp; 13281556Srgrimes 13291556Srgrimes if (n == NULL) 13301556Srgrimes return; 13311556Srgrimes switch (n->type) { 13321556Srgrimes case NSEMI: 13331556Srgrimes cmdtxt(n->nbinary.ch1); 13341556Srgrimes cmdputs("; "); 13351556Srgrimes cmdtxt(n->nbinary.ch2); 13361556Srgrimes break; 13371556Srgrimes case NAND: 13381556Srgrimes cmdtxt(n->nbinary.ch1); 13391556Srgrimes cmdputs(" && "); 13401556Srgrimes cmdtxt(n->nbinary.ch2); 13411556Srgrimes break; 13421556Srgrimes case NOR: 13431556Srgrimes cmdtxt(n->nbinary.ch1); 13441556Srgrimes cmdputs(" || "); 13451556Srgrimes cmdtxt(n->nbinary.ch2); 13461556Srgrimes break; 13471556Srgrimes case NPIPE: 13481556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 13491556Srgrimes cmdtxt(lp->n); 13501556Srgrimes if (lp->next) 13511556Srgrimes cmdputs(" | "); 13521556Srgrimes } 13531556Srgrimes break; 13541556Srgrimes case NSUBSHELL: 13551556Srgrimes cmdputs("("); 13561556Srgrimes cmdtxt(n->nredir.n); 13571556Srgrimes cmdputs(")"); 13581556Srgrimes break; 13591556Srgrimes case NREDIR: 13601556Srgrimes case NBACKGND: 13611556Srgrimes cmdtxt(n->nredir.n); 13621556Srgrimes break; 13631556Srgrimes case NIF: 13641556Srgrimes cmdputs("if "); 13651556Srgrimes cmdtxt(n->nif.test); 13661556Srgrimes cmdputs("; then "); 13671556Srgrimes cmdtxt(n->nif.ifpart); 13681556Srgrimes cmdputs("..."); 13691556Srgrimes break; 13701556Srgrimes case NWHILE: 13711556Srgrimes cmdputs("while "); 1372273152Sjilles cmdtxt(n->nbinary.ch1); 1373273152Sjilles cmdtxtdogroup(n->nbinary.ch2); 1374273152Sjilles break; 13751556Srgrimes case NUNTIL: 13761556Srgrimes cmdputs("until "); 13771556Srgrimes cmdtxt(n->nbinary.ch1); 1378273152Sjilles cmdtxtdogroup(n->nbinary.ch2); 13791556Srgrimes break; 13801556Srgrimes case NFOR: 13811556Srgrimes cmdputs("for "); 13821556Srgrimes cmdputs(n->nfor.var); 13831556Srgrimes cmdputs(" in ..."); 13841556Srgrimes break; 13851556Srgrimes case NCASE: 13861556Srgrimes cmdputs("case "); 13871556Srgrimes cmdputs(n->ncase.expr->narg.text); 13881556Srgrimes cmdputs(" in ..."); 13891556Srgrimes break; 13901556Srgrimes case NDEFUN: 13911556Srgrimes cmdputs(n->narg.text); 13921556Srgrimes cmdputs("() ..."); 13931556Srgrimes break; 1394246162Sjilles case NNOT: 1395246162Sjilles cmdputs("! "); 1396246162Sjilles cmdtxt(n->nnot.com); 1397246162Sjilles break; 13981556Srgrimes case NCMD: 13991556Srgrimes for (np = n->ncmd.args ; np ; np = np->narg.next) { 14001556Srgrimes cmdtxt(np); 14011556Srgrimes if (np->narg.next) 14021556Srgrimes cmdputs(" "); 14031556Srgrimes } 14041556Srgrimes for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 14051556Srgrimes cmdputs(" "); 14061556Srgrimes cmdtxt(np); 14071556Srgrimes } 14081556Srgrimes break; 14091556Srgrimes case NARG: 14101556Srgrimes cmdputs(n->narg.text); 14111556Srgrimes break; 14121556Srgrimes case NTO: 1413273152Sjilles cmdtxtredir(n, ">", 1); 1414273152Sjilles break; 14151556Srgrimes case NAPPEND: 1416273152Sjilles cmdtxtredir(n, ">>", 1); 1417273152Sjilles break; 14181556Srgrimes case NTOFD: 1419273152Sjilles cmdtxtredir(n, ">&", 1); 1420273152Sjilles break; 142196922Stjr case NCLOBBER: 1422273152Sjilles cmdtxtredir(n, ">|", 1); 1423273152Sjilles break; 14241556Srgrimes case NFROM: 1425273152Sjilles cmdtxtredir(n, "<", 0); 1426273152Sjilles break; 142766612Sbrian case NFROMTO: 1428273152Sjilles cmdtxtredir(n, "<>", 0); 1429273152Sjilles break; 14301556Srgrimes case NFROMFD: 1431273152Sjilles cmdtxtredir(n, "<&", 0); 14321556Srgrimes break; 14331556Srgrimes case NHERE: 14341556Srgrimes case NXHERE: 14351556Srgrimes cmdputs("<<..."); 14361556Srgrimes break; 14371556Srgrimes default: 14381556Srgrimes cmdputs("???"); 14391556Srgrimes break; 14401556Srgrimes } 14411556Srgrimes} 14421556Srgrimes 14431556Srgrimes 14441556Srgrimes 1445213811Sobrienstatic void 1446201053Sjillescmdputs(const char *s) 144790111Simp{ 1448201053Sjilles const char *p; 1449201053Sjilles char *q; 145025222Ssteve char c; 14511556Srgrimes int subtype = 0; 14521556Srgrimes 14531556Srgrimes if (cmdnleft <= 0) 14541556Srgrimes return; 14551556Srgrimes p = s; 14561556Srgrimes q = cmdnextc; 14571556Srgrimes while ((c = *p++) != '\0') { 14581556Srgrimes if (c == CTLESC) 14591556Srgrimes *q++ = *p++; 14601556Srgrimes else if (c == CTLVAR) { 14611556Srgrimes *q++ = '$'; 14621556Srgrimes if (--cmdnleft > 0) 14631556Srgrimes *q++ = '{'; 14641556Srgrimes subtype = *p++; 1465216246Sjilles if ((subtype & VSTYPE) == VSLENGTH && --cmdnleft > 0) 1466216246Sjilles *q++ = '#'; 14671556Srgrimes } else if (c == '=' && subtype != 0) { 1468216246Sjilles *q = "}-+?=##%%\0X"[(subtype & VSTYPE) - VSNORMAL]; 1469216246Sjilles if (*q) 1470216246Sjilles q++; 1471216246Sjilles else 1472216246Sjilles cmdnleft++; 1473216246Sjilles if (((subtype & VSTYPE) == VSTRIMLEFTMAX || 1474216246Sjilles (subtype & VSTYPE) == VSTRIMRIGHTMAX) && 1475216246Sjilles --cmdnleft > 0) 1476216246Sjilles *q = q[-1], q++; 14771556Srgrimes subtype = 0; 14781556Srgrimes } else if (c == CTLENDVAR) { 14791556Srgrimes *q++ = '}'; 1480216246Sjilles } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) { 1481216246Sjilles cmdnleft -= 5; 1482216246Sjilles if (cmdnleft > 0) { 1483216246Sjilles *q++ = '$'; 1484216246Sjilles *q++ = '('; 1485216246Sjilles *q++ = '.'; 1486216246Sjilles *q++ = '.'; 1487216246Sjilles *q++ = '.'; 1488216246Sjilles *q++ = ')'; 1489216246Sjilles } 1490216246Sjilles } else if (c == CTLARI) { 1491216246Sjilles cmdnleft -= 2; 1492216246Sjilles if (cmdnleft > 0) { 1493216246Sjilles *q++ = '$'; 1494216246Sjilles *q++ = '('; 1495216246Sjilles *q++ = '('; 1496216246Sjilles } 1497216246Sjilles p++; 1498216246Sjilles } else if (c == CTLENDARI) { 1499216246Sjilles if (--cmdnleft > 0) { 1500216246Sjilles *q++ = ')'; 1501216246Sjilles *q++ = ')'; 1502216246Sjilles } 1503216246Sjilles } else if (c == CTLQUOTEMARK || c == CTLQUOTEEND) 1504216246Sjilles cmdnleft++; /* ignore */ 15051556Srgrimes else 15061556Srgrimes *q++ = c; 15071556Srgrimes if (--cmdnleft <= 0) { 15081556Srgrimes *q++ = '.'; 15091556Srgrimes *q++ = '.'; 15101556Srgrimes *q++ = '.'; 15111556Srgrimes break; 15121556Srgrimes } 15131556Srgrimes } 15141556Srgrimes cmdnextc = q; 15151556Srgrimes} 1516