jobs.c revision 223060
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 223060 2011-06-13 21:03:27Z 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" 6017987Speter#include "show.h" 611556Srgrimes#include "main.h" 621556Srgrimes#include "parser.h" 631556Srgrimes#include "nodes.h" 641556Srgrimes#include "jobs.h" 651556Srgrimes#include "options.h" 661556Srgrimes#include "trap.h" 671556Srgrimes#include "syntax.h" 681556Srgrimes#include "input.h" 691556Srgrimes#include "output.h" 701556Srgrimes#include "memalloc.h" 711556Srgrimes#include "error.h" 721556Srgrimes#include "mystring.h" 73223024Sjilles#include "var.h" 74223060Sjilles#include "builtins.h" 751556Srgrimes 761556Srgrimes 77213760Sobrienstatic struct job *jobtab; /* array of jobs */ 78213760Sobrienstatic int njobs; /* size of array */ 7928346SsteveMKINIT pid_t backgndpid = -1; /* pid of last background process */ 80209600SjillesMKINIT struct job *bgjob = NULL; /* last background process */ 811556Srgrimes#if JOBS 82213760Sobrienstatic struct job *jobmru; /* most recently used job list */ 83213760Sobrienstatic pid_t initialpgrp; /* pgrp of shell on invocation */ 841556Srgrimes#endif 8538536Scracauerint in_waitcmd = 0; /* are we in waitcmd()? */ 8638950Scracauerint in_dowait = 0; /* are we in dowait()? */ 8738536Scracauervolatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */ 8899762Stjrstatic int ttyfd = -1; 891556Srgrimes 9020425Ssteve#if JOBS 91213811Sobrienstatic void restartjob(struct job *); 9220425Ssteve#endif 93213811Sobrienstatic void freejob(struct job *); 94213811Sobrienstatic struct job *getjob(char *); 95213811Sobrienstatic pid_t dowait(int, struct job *); 96213811Sobrienstatic pid_t waitproc(int, int *); 97213811Sobrienstatic void checkzombies(void); 98213811Sobrienstatic void cmdtxt(union node *); 99213811Sobrienstatic void cmdputs(const char *); 10097659Stjr#if JOBS 101213811Sobrienstatic void setcurjob(struct job *); 102213811Sobrienstatic void deljob(struct job *); 103213811Sobrienstatic struct job *getcurjob(struct job *); 10497659Stjr#endif 105216217Sjillesstatic void printjobcmd(struct job *); 106216217Sjillesstatic void showjob(struct job *, int); 1071556Srgrimes 1081556Srgrimes 1091556Srgrimes/* 1101556Srgrimes * Turn job control on and off. 1111556Srgrimes */ 1121556Srgrimes 1131556SrgrimesMKINIT int jobctl; 1141556Srgrimes 11520425Ssteve#if JOBS 1161556Srgrimesvoid 11790111Simpsetjobctl(int on) 11817987Speter{ 11999762Stjr int i; 1201556Srgrimes 1211556Srgrimes if (on == jobctl || rootshell == 0) 1221556Srgrimes return; 1231556Srgrimes if (on) { 12499762Stjr if (ttyfd != -1) 12599762Stjr close(ttyfd); 12699762Stjr if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) { 12799762Stjr i = 0; 12899762Stjr while (i <= 2 && !isatty(i)) 12999762Stjr i++; 130109927Stjr if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0) 13199762Stjr goto out; 13299762Stjr } 133109927Stjr if (ttyfd < 10) { 134109927Stjr /* 135109927Stjr * Keep our TTY file descriptor out of the way of 136109927Stjr * the user's redirections. 137109927Stjr */ 138109927Stjr if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) { 139109927Stjr close(ttyfd); 140109927Stjr ttyfd = -1; 141109927Stjr goto out; 142109927Stjr } 143109927Stjr close(ttyfd); 144109927Stjr ttyfd = i; 145109927Stjr } 146103223Snectar if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) { 14799762Stjr close(ttyfd); 14899762Stjr ttyfd = -1; 14999762Stjr goto out; 15099762Stjr } 1511556Srgrimes do { /* while we are in the background */ 15299762Stjr initialpgrp = tcgetpgrp(ttyfd); 15320425Ssteve if (initialpgrp < 0) { 154199629Sjillesout: out2fmt_flush("sh: can't access tty; job control turned off\n"); 1551556Srgrimes mflag = 0; 1561556Srgrimes return; 1571556Srgrimes } 158216400Sjilles if (initialpgrp != getpgrp()) { 159216400Sjilles kill(0, SIGTTIN); 1601556Srgrimes continue; 1611556Srgrimes } 1621556Srgrimes } while (0); 1631556Srgrimes setsignal(SIGTSTP); 1641556Srgrimes setsignal(SIGTTOU); 1651556Srgrimes setsignal(SIGTTIN); 16617987Speter setpgid(0, rootpid); 16799762Stjr tcsetpgrp(ttyfd, rootpid); 1681556Srgrimes } else { /* turning job control off */ 16917987Speter setpgid(0, initialpgrp); 17099762Stjr tcsetpgrp(ttyfd, initialpgrp); 17199762Stjr close(ttyfd); 17299762Stjr ttyfd = -1; 1731556Srgrimes setsignal(SIGTSTP); 1741556Srgrimes setsignal(SIGTTOU); 1751556Srgrimes setsignal(SIGTTIN); 1761556Srgrimes } 1771556Srgrimes jobctl = on; 1781556Srgrimes} 17920425Ssteve#endif 1801556Srgrimes 1811556Srgrimes 1821556Srgrimes#if JOBS 18317987Speterint 18490111Simpfgcmd(int argc __unused, char **argv) 18517987Speter{ 1861556Srgrimes struct job *jp; 187100308Stjr pid_t pgrp; 1881556Srgrimes int status; 1891556Srgrimes 1901556Srgrimes jp = getjob(argv[1]); 1911556Srgrimes if (jp->jobctl == 0) 1921556Srgrimes error("job not created under job control"); 193216217Sjilles printjobcmd(jp); 19496933Stjr flushout(&output); 1951556Srgrimes pgrp = jp->ps[0].pid; 19699762Stjr tcsetpgrp(ttyfd, pgrp); 1971556Srgrimes restartjob(jp); 198100305Stjr jp->foreground = 1; 1991556Srgrimes INTOFF; 20045916Scracauer status = waitforjob(jp, (int *)NULL); 2011556Srgrimes INTON; 2021556Srgrimes return status; 2031556Srgrimes} 2041556Srgrimes 2051556Srgrimes 20617987Speterint 20790111Simpbgcmd(int argc, char **argv) 20817987Speter{ 2091556Srgrimes struct job *jp; 2101556Srgrimes 2111556Srgrimes do { 2121556Srgrimes jp = getjob(*++argv); 2131556Srgrimes if (jp->jobctl == 0) 2141556Srgrimes error("job not created under job control"); 21596933Stjr if (jp->state == JOBDONE) 21696933Stjr continue; 2171556Srgrimes restartjob(jp); 218100305Stjr jp->foreground = 0; 219216400Sjilles out1fmt("[%td] ", jp - jobtab + 1); 220216217Sjilles printjobcmd(jp); 2211556Srgrimes } while (--argc > 1); 2221556Srgrimes return 0; 2231556Srgrimes} 2241556Srgrimes 2251556Srgrimes 226213811Sobrienstatic void 22790111Simprestartjob(struct job *jp) 22817987Speter{ 2291556Srgrimes struct procstat *ps; 2301556Srgrimes int i; 2311556Srgrimes 2321556Srgrimes if (jp->state == JOBDONE) 2331556Srgrimes return; 23497660Stjr setcurjob(jp); 2351556Srgrimes INTOFF; 236216400Sjilles kill(-jp->ps[0].pid, SIGCONT); 2371556Srgrimes for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 23826104Ssteve if (WIFSTOPPED(ps->status)) { 2391556Srgrimes ps->status = -1; 2401556Srgrimes jp->state = 0; 2411556Srgrimes } 2421556Srgrimes } 2431556Srgrimes INTON; 2441556Srgrimes} 2451556Srgrimes#endif 2461556Srgrimes 2471556Srgrimes 2481556Srgrimesint 24997669Stjrjobscmd(int argc, char *argv[]) 25017987Speter{ 25197669Stjr char *id; 252163085Sstefanf int ch, mode; 25397669Stjr 25497669Stjr optind = optreset = 1; 255100663Stjr opterr = 0; 256163085Sstefanf mode = SHOWJOBS_DEFAULT; 257163085Sstefanf while ((ch = getopt(argc, argv, "lps")) != -1) { 25897669Stjr switch (ch) { 25997669Stjr case 'l': 260163085Sstefanf mode = SHOWJOBS_VERBOSE; 26197669Stjr break; 262163085Sstefanf case 'p': 263163085Sstefanf mode = SHOWJOBS_PGIDS; 264163085Sstefanf break; 26597669Stjr case 's': 266163085Sstefanf mode = SHOWJOBS_PIDS; 26797669Stjr break; 26897669Stjr case '?': 26997669Stjr default: 27097669Stjr error("unknown option: -%c", optopt); 27197669Stjr } 27297669Stjr } 27397669Stjr argc -= optind; 27497669Stjr argv += optind; 27597669Stjr 27697669Stjr if (argc == 0) 277163085Sstefanf showjobs(0, mode); 27897669Stjr else 27997669Stjr while ((id = *argv++) != NULL) 280216217Sjilles showjob(getjob(id), mode); 28197669Stjr 28297669Stjr return (0); 2831556Srgrimes} 2841556Srgrimes 285213811Sobrienstatic void 286216217Sjillesprintjobcmd(struct job *jp) 28797663Stjr{ 288216217Sjilles struct procstat *ps; 289216217Sjilles int i; 290216217Sjilles 291216217Sjilles for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 292216217Sjilles out1str(ps->cmd); 293216217Sjilles if (i > 0) 294216217Sjilles out1str(" | "); 295216217Sjilles } 296216217Sjilles out1c('\n'); 297216217Sjilles} 298216217Sjilles 299216217Sjillesstatic void 300216217Sjillesshowjob(struct job *jp, int mode) 301216217Sjilles{ 30297663Stjr char s[64]; 303216217Sjilles char statestr[64]; 30497663Stjr struct procstat *ps; 30597669Stjr struct job *j; 30697669Stjr int col, curr, i, jobno, prev, procno; 30797669Stjr char c; 3081556Srgrimes 309163085Sstefanf procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs; 31097663Stjr jobno = jp - jobtab + 1; 31197669Stjr curr = prev = 0; 31297669Stjr#if JOBS 31397669Stjr if ((j = getcurjob(NULL)) != NULL) { 31497669Stjr curr = j - jobtab + 1; 31597669Stjr if ((j = getcurjob(j)) != NULL) 31697669Stjr prev = j - jobtab + 1; 31797669Stjr } 31897669Stjr#endif 319216217Sjilles ps = jp->ps + jp->nprocs - 1; 320216217Sjilles if (jp->state == 0) { 321216217Sjilles strcpy(statestr, "Running"); 322216217Sjilles#if JOBS 323216217Sjilles } else if (jp->state == JOBSTOPPED) { 324216217Sjilles while (!WIFSTOPPED(ps->status) && ps > jp->ps) 325216217Sjilles ps--; 326216217Sjilles if (WIFSTOPPED(ps->status)) 327216217Sjilles i = WSTOPSIG(ps->status); 328216217Sjilles else 329216217Sjilles i = -1; 330216217Sjilles if (i > 0 && i < sys_nsig && sys_siglist[i]) 331216217Sjilles strcpy(statestr, sys_siglist[i]); 332216217Sjilles else 333216217Sjilles strcpy(statestr, "Suspended"); 334216217Sjilles#endif 335216217Sjilles } else if (WIFEXITED(ps->status)) { 336216217Sjilles if (WEXITSTATUS(ps->status) == 0) 337216217Sjilles strcpy(statestr, "Done"); 338216217Sjilles else 339216220Sjilles fmtstr(statestr, 64, "Done(%d)", 340216217Sjilles WEXITSTATUS(ps->status)); 341216217Sjilles } else { 342216217Sjilles i = WTERMSIG(ps->status); 343216217Sjilles if (i > 0 && i < sys_nsig && sys_siglist[i]) 344216217Sjilles strcpy(statestr, sys_siglist[i]); 345216217Sjilles else 346216217Sjilles fmtstr(statestr, 64, "Signal %d", i); 347216217Sjilles if (WCOREDUMP(ps->status)) 348216217Sjilles strcat(statestr, " (core dumped)"); 349216217Sjilles } 350216217Sjilles 35197663Stjr for (ps = jp->ps ; ; ps++) { /* for each process */ 352163085Sstefanf if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) { 353216199Sjilles out1fmt("%d\n", (int)ps->pid); 35497669Stjr goto skip; 35597669Stjr } 356216217Sjilles if (mode != SHOWJOBS_VERBOSE && ps != jp->ps) 35797669Stjr goto skip; 35897819Stjr if (jobno == curr && ps == jp->ps) 35997669Stjr c = '+'; 36097819Stjr else if (jobno == prev && ps == jp->ps) 36197669Stjr c = '-'; 36297669Stjr else 36397669Stjr c = ' '; 36497663Stjr if (ps == jp->ps) 36597669Stjr fmtstr(s, 64, "[%d] %c ", jobno, c); 36697663Stjr else 36797816Stjr fmtstr(s, 64, " %c ", c); 36897663Stjr out1str(s); 36997663Stjr col = strlen(s); 370163085Sstefanf if (mode == SHOWJOBS_VERBOSE) { 371100308Stjr fmtstr(s, 64, "%d ", (int)ps->pid); 37297669Stjr out1str(s); 37397669Stjr col += strlen(s); 37497669Stjr } 375216217Sjilles if (ps == jp->ps) { 376216217Sjilles out1str(statestr); 377216217Sjilles col += strlen(statestr); 37897663Stjr } 37997663Stjr do { 38097663Stjr out1c(' '); 38197663Stjr col++; 38297663Stjr } while (col < 30); 383216217Sjilles if (mode == SHOWJOBS_VERBOSE) { 384216217Sjilles out1str(ps->cmd); 385216217Sjilles out1c('\n'); 386216217Sjilles } else 387216217Sjilles printjobcmd(jp); 38897669Stjrskip: if (--procno <= 0) 38997663Stjr break; 39097663Stjr } 39197663Stjr} 39297663Stjr 3931556Srgrimes/* 3941556Srgrimes * Print a list of jobs. If "change" is nonzero, only print jobs whose 3951556Srgrimes * statuses have changed since the last call to showjobs. 3961556Srgrimes * 3971556Srgrimes * If the shell is interrupted in the process of creating a job, the 3981556Srgrimes * result may be a job structure containing zero processes. Such structures 3991556Srgrimes * will be freed here. 4001556Srgrimes */ 4011556Srgrimes 4021556Srgrimesvoid 403163085Sstefanfshowjobs(int change, int mode) 40417987Speter{ 4051556Srgrimes int jobno; 4061556Srgrimes struct job *jp; 4071556Srgrimes 4081556Srgrimes TRACE(("showjobs(%d) called\n", change)); 409208489Sjilles checkzombies(); 4101556Srgrimes for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 4111556Srgrimes if (! jp->used) 4121556Srgrimes continue; 4131556Srgrimes if (jp->nprocs == 0) { 4141556Srgrimes freejob(jp); 4151556Srgrimes continue; 4161556Srgrimes } 4171556Srgrimes if (change && ! jp->changed) 4181556Srgrimes continue; 419216217Sjilles showjob(jp, mode); 4201556Srgrimes jp->changed = 0; 421209600Sjilles /* Hack: discard jobs for which $! has not been referenced 422209600Sjilles * in interactive mode when they terminate. 423209600Sjilles */ 424209600Sjilles if (jp->state == JOBDONE && !jp->remembered && 425209600Sjilles (iflag || jp != bgjob)) { 4261556Srgrimes freejob(jp); 4271556Srgrimes } 4281556Srgrimes } 4291556Srgrimes} 4301556Srgrimes 4311556Srgrimes 4321556Srgrimes/* 4331556Srgrimes * Mark a job structure as unused. 4341556Srgrimes */ 4351556Srgrimes 436213811Sobrienstatic void 43790111Simpfreejob(struct job *jp) 43890111Simp{ 4391556Srgrimes struct procstat *ps; 4401556Srgrimes int i; 4411556Srgrimes 4421556Srgrimes INTOFF; 443209600Sjilles if (bgjob == jp) 444209600Sjilles bgjob = NULL; 4451556Srgrimes for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 4461556Srgrimes if (ps->cmd != nullstr) 4471556Srgrimes ckfree(ps->cmd); 4481556Srgrimes } 4491556Srgrimes if (jp->ps != &jp->ps0) 4501556Srgrimes ckfree(jp->ps); 4511556Srgrimes jp->used = 0; 4521556Srgrimes#if JOBS 45397659Stjr deljob(jp); 4541556Srgrimes#endif 4551556Srgrimes INTON; 4561556Srgrimes} 4571556Srgrimes 4581556Srgrimes 4591556Srgrimes 4601556Srgrimesint 46190111Simpwaitcmd(int argc, char **argv) 46217987Speter{ 4631556Srgrimes struct job *job; 46426104Ssteve int status, retval; 4651556Srgrimes struct job *jp; 4661556Srgrimes 4671556Srgrimes if (argc > 1) { 4681556Srgrimes job = getjob(argv[1]); 4691556Srgrimes } else { 4701556Srgrimes job = NULL; 4711556Srgrimes } 47238536Scracauer 47338536Scracauer /* 47438536Scracauer * Loop until a process is terminated or stopped, or a SIGINT is 47538536Scracauer * received. 47638536Scracauer */ 47738536Scracauer 47838521Scracauer in_waitcmd++; 47938536Scracauer do { 4801556Srgrimes if (job != NULL) { 4811556Srgrimes if (job->state) { 4821556Srgrimes status = job->ps[job->nprocs - 1].status; 48326104Ssteve if (WIFEXITED(status)) 48426104Ssteve retval = WEXITSTATUS(status); 4851556Srgrimes#if JOBS 48626104Ssteve else if (WIFSTOPPED(status)) 48726104Ssteve retval = WSTOPSIG(status) + 128; 4881556Srgrimes#endif 4891556Srgrimes else 49026104Ssteve retval = WTERMSIG(status) + 128; 491209600Sjilles if (! iflag || ! job->changed) 4921556Srgrimes freejob(job); 493209600Sjilles else { 494209600Sjilles job->remembered = 0; 495209600Sjilles if (job == bgjob) 496209600Sjilles bgjob = NULL; 497209600Sjilles } 49838536Scracauer in_waitcmd--; 49926104Ssteve return retval; 5001556Srgrimes } 5011556Srgrimes } else { 502209600Sjilles for (jp = jobtab ; jp < jobtab + njobs; jp++) 503209600Sjilles if (jp->used && jp->state == JOBDONE) { 504209600Sjilles if (! iflag || ! jp->changed) 505209600Sjilles freejob(jp); 506209600Sjilles else { 507209600Sjilles jp->remembered = 0; 508209600Sjilles if (jp == bgjob) 509209600Sjilles bgjob = NULL; 510209600Sjilles } 511209600Sjilles } 5121556Srgrimes for (jp = jobtab ; ; jp++) { 5131556Srgrimes if (jp >= jobtab + njobs) { /* no running procs */ 51438536Scracauer in_waitcmd--; 5151556Srgrimes return 0; 5161556Srgrimes } 5171556Srgrimes if (jp->used && jp->state == 0) 5181556Srgrimes break; 5191556Srgrimes } 5201556Srgrimes } 52138521Scracauer } while (dowait(1, (struct job *)NULL) != -1); 52238521Scracauer in_waitcmd--; 52338521Scracauer 52438521Scracauer return 0; 5251556Srgrimes} 5261556Srgrimes 5271556Srgrimes 5281556Srgrimes 52917987Speterint 53090111Simpjobidcmd(int argc __unused, char **argv) 53117987Speter{ 5321556Srgrimes struct job *jp; 5331556Srgrimes int i; 5341556Srgrimes 5351556Srgrimes jp = getjob(argv[1]); 5361556Srgrimes for (i = 0 ; i < jp->nprocs ; ) { 537100308Stjr out1fmt("%d", (int)jp->ps[i].pid); 5381556Srgrimes out1c(++i < jp->nprocs? ' ' : '\n'); 5391556Srgrimes } 5401556Srgrimes return 0; 5411556Srgrimes} 5421556Srgrimes 5431556Srgrimes 5441556Srgrimes 5451556Srgrimes/* 5461556Srgrimes * Convert a job name to a job structure. 5471556Srgrimes */ 5481556Srgrimes 549213811Sobrienstatic struct job * 55090111Simpgetjob(char *name) 55190111Simp{ 5521556Srgrimes int jobno; 55397688Stjr struct job *found, *jp; 554100308Stjr pid_t pid; 5551556Srgrimes int i; 5561556Srgrimes 5571556Srgrimes if (name == NULL) { 5581556Srgrimes#if JOBS 55997659Stjrcurrentjob: if ((jp = getcurjob(NULL)) == NULL) 5601556Srgrimes error("No current job"); 56197659Stjr return (jp); 5621556Srgrimes#else 5631556Srgrimes error("No current job"); 5641556Srgrimes#endif 5651556Srgrimes } else if (name[0] == '%') { 5661556Srgrimes if (is_digit(name[1])) { 5671556Srgrimes jobno = number(name + 1); 5681556Srgrimes if (jobno > 0 && jobno <= njobs 5691556Srgrimes && jobtab[jobno - 1].used != 0) 5701556Srgrimes return &jobtab[jobno - 1]; 5711556Srgrimes#if JOBS 5721556Srgrimes } else if (name[1] == '%' && name[2] == '\0') { 5731556Srgrimes goto currentjob; 57497688Stjr } else if (name[1] == '+' && name[2] == '\0') { 57597688Stjr goto currentjob; 57697688Stjr } else if (name[1] == '-' && name[2] == '\0') { 57797688Stjr if ((jp = getcurjob(NULL)) == NULL || 57897688Stjr (jp = getcurjob(jp)) == NULL) 57997688Stjr error("No previous job"); 58097688Stjr return (jp); 5811556Srgrimes#endif 58297688Stjr } else if (name[1] == '?') { 58397688Stjr found = NULL; 58497688Stjr for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 58597688Stjr if (jp->used && jp->nprocs > 0 58697688Stjr && strstr(jp->ps[0].cmd, name + 2) != NULL) { 58797688Stjr if (found) 58897688Stjr error("%s: ambiguous", name); 58997688Stjr found = jp; 59097688Stjr } 59197688Stjr } 59297688Stjr if (found != NULL) 59397688Stjr return (found); 5941556Srgrimes } else { 59597688Stjr found = NULL; 5961556Srgrimes for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 5971556Srgrimes if (jp->used && jp->nprocs > 0 5981556Srgrimes && prefix(name + 1, jp->ps[0].cmd)) { 5991556Srgrimes if (found) 6001556Srgrimes error("%s: ambiguous", name); 6011556Srgrimes found = jp; 6021556Srgrimes } 6031556Srgrimes } 6041556Srgrimes if (found) 6051556Srgrimes return found; 6061556Srgrimes } 6071556Srgrimes } else if (is_number(name)) { 608100308Stjr pid = (pid_t)number(name); 6091556Srgrimes for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 6101556Srgrimes if (jp->used && jp->nprocs > 0 6111556Srgrimes && jp->ps[jp->nprocs - 1].pid == pid) 6121556Srgrimes return jp; 6131556Srgrimes } 6141556Srgrimes } 6151556Srgrimes error("No such job: %s", name); 61617987Speter /*NOTREACHED*/ 61717987Speter return NULL; 6181556Srgrimes} 6191556Srgrimes 6201556Srgrimes 621216629Sjillespid_t 622216629Sjillesgetjobpgrp(char *name) 623216629Sjilles{ 624216629Sjilles struct job *jp; 6251556Srgrimes 626216629Sjilles jp = getjob(name); 627216629Sjilles return -jp->ps[0].pid; 628216629Sjilles} 629216629Sjilles 6301556Srgrimes/* 6311556Srgrimes * Return a new job structure, 6321556Srgrimes */ 6331556Srgrimes 6341556Srgrimesstruct job * 63590111Simpmakejob(union node *node __unused, int nprocs) 63617987Speter{ 6371556Srgrimes int i; 6381556Srgrimes struct job *jp; 6391556Srgrimes 6401556Srgrimes for (i = njobs, jp = jobtab ; ; jp++) { 6411556Srgrimes if (--i < 0) { 6421556Srgrimes INTOFF; 6431556Srgrimes if (njobs == 0) { 6441556Srgrimes jobtab = ckmalloc(4 * sizeof jobtab[0]); 64597664Stjr#if JOBS 64697659Stjr jobmru = NULL; 64797664Stjr#endif 6481556Srgrimes } else { 6491556Srgrimes jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 65017987Speter memcpy(jp, jobtab, njobs * sizeof jp[0]); 65197659Stjr#if JOBS 65297659Stjr /* Relocate `next' pointers and list head */ 65399760Stjr if (jobmru != NULL) 65499760Stjr jobmru = &jp[jobmru - jobtab]; 65597659Stjr for (i = 0; i < njobs; i++) 65697659Stjr if (jp[i].next != NULL) 65797659Stjr jp[i].next = &jp[jp[i].next - 65897659Stjr jobtab]; 65997659Stjr#endif 660209600Sjilles if (bgjob != NULL) 661209600Sjilles bgjob = &jp[bgjob - jobtab]; 66220425Ssteve /* Relocate `ps' pointers */ 66320425Ssteve for (i = 0; i < njobs; i++) 66420425Ssteve if (jp[i].ps == &jobtab[i].ps0) 66520425Ssteve jp[i].ps = &jp[i].ps0; 6661556Srgrimes ckfree(jobtab); 6671556Srgrimes jobtab = jp; 6681556Srgrimes } 6691556Srgrimes jp = jobtab + njobs; 6701556Srgrimes for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 6711556Srgrimes INTON; 6721556Srgrimes break; 6731556Srgrimes } 6741556Srgrimes if (jp->used == 0) 6751556Srgrimes break; 6761556Srgrimes } 6771556Srgrimes INTOFF; 6781556Srgrimes jp->state = 0; 6791556Srgrimes jp->used = 1; 6801556Srgrimes jp->changed = 0; 6811556Srgrimes jp->nprocs = 0; 682100305Stjr jp->foreground = 0; 683209600Sjilles jp->remembered = 0; 6841556Srgrimes#if JOBS 6851556Srgrimes jp->jobctl = jobctl; 68697659Stjr jp->next = NULL; 6871556Srgrimes#endif 6881556Srgrimes if (nprocs > 1) { 6891556Srgrimes jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 6901556Srgrimes } else { 6911556Srgrimes jp->ps = &jp->ps0; 6921556Srgrimes } 6931556Srgrimes INTON; 694213775Sjhb TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs, 69517987Speter jp - jobtab + 1)); 6961556Srgrimes return jp; 6978855Srgrimes} 6981556Srgrimes 69997659Stjr#if JOBS 700213811Sobrienstatic void 70197659Stjrsetcurjob(struct job *cj) 70297659Stjr{ 70397659Stjr struct job *jp, *prev; 7041556Srgrimes 70597659Stjr for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 70697659Stjr if (jp == cj) { 70797659Stjr if (prev != NULL) 70897659Stjr prev->next = jp->next; 70997659Stjr else 71097659Stjr jobmru = jp->next; 71197659Stjr jp->next = jobmru; 71297659Stjr jobmru = cj; 71397659Stjr return; 71497659Stjr } 71597659Stjr } 71697659Stjr cj->next = jobmru; 71797659Stjr jobmru = cj; 71897659Stjr} 71997659Stjr 720213811Sobrienstatic void 72197659Stjrdeljob(struct job *j) 72297659Stjr{ 72397659Stjr struct job *jp, *prev; 72497659Stjr 72597659Stjr for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 72697659Stjr if (jp == j) { 72797659Stjr if (prev != NULL) 72897659Stjr prev->next = jp->next; 72997659Stjr else 73097659Stjr jobmru = jp->next; 73197659Stjr return; 73297659Stjr } 73397659Stjr } 73497659Stjr} 73597659Stjr 7361556Srgrimes/* 73797659Stjr * Return the most recently used job that isn't `nj', and preferably one 73897659Stjr * that is stopped. 73997659Stjr */ 740213811Sobrienstatic struct job * 74197659Stjrgetcurjob(struct job *nj) 74297659Stjr{ 74397659Stjr struct job *jp; 74497659Stjr 74597659Stjr /* Try to find a stopped one.. */ 74697659Stjr for (jp = jobmru; jp != NULL; jp = jp->next) 74797659Stjr if (jp->used && jp != nj && jp->state == JOBSTOPPED) 74897659Stjr return (jp); 74997659Stjr /* Otherwise the most recently used job that isn't `nj' */ 75097659Stjr for (jp = jobmru; jp != NULL; jp = jp->next) 75197659Stjr if (jp->used && jp != nj) 75297659Stjr return (jp); 75397659Stjr 75497659Stjr return (NULL); 75597659Stjr} 75697659Stjr 75797659Stjr#endif 75897659Stjr 75997659Stjr/* 7601556Srgrimes * Fork of a subshell. If we are doing job control, give the subshell its 7611556Srgrimes * own process group. Jp is a job structure that the job is to be added to. 7621556Srgrimes * N is the command that will be evaluated by the child. Both jp and n may 7631556Srgrimes * be NULL. The mode parameter can be one of the following: 7641556Srgrimes * FORK_FG - Fork off a foreground process. 7651556Srgrimes * FORK_BG - Fork off a background process. 7661556Srgrimes * FORK_NOJOB - Like FORK_FG, but don't give the process its own 7671556Srgrimes * process group even if job control is on. 7681556Srgrimes * 7691556Srgrimes * When job control is turned off, background processes have their standard 7701556Srgrimes * input redirected to /dev/null (except for the second and later processes 7711556Srgrimes * in a pipeline). 7721556Srgrimes */ 7731556Srgrimes 774100308Stjrpid_t 77590111Simpforkshell(struct job *jp, union node *n, int mode) 77617987Speter{ 777100308Stjr pid_t pid; 778100308Stjr pid_t pgrp; 7791556Srgrimes 780213775Sjhb TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n, 78117987Speter mode)); 7821556Srgrimes INTOFF; 783216208Sjilles if (mode == FORK_BG && (jp == NULL || jp->nprocs == 0)) 784208489Sjilles checkzombies(); 785112341Stjr flushall(); 7861556Srgrimes pid = fork(); 7871556Srgrimes if (pid == -1) { 7881556Srgrimes TRACE(("Fork failed, errno=%d\n", errno)); 7891556Srgrimes INTON; 79053891Scracauer error("Cannot fork: %s", strerror(errno)); 7911556Srgrimes } 7921556Srgrimes if (pid == 0) { 7931556Srgrimes struct job *p; 7941556Srgrimes int wasroot; 7951556Srgrimes int i; 7961556Srgrimes 797100308Stjr TRACE(("Child shell %d\n", (int)getpid())); 7981556Srgrimes wasroot = rootshell; 7991556Srgrimes rootshell = 0; 800200998Sjilles handler = &main_handler; 8011556Srgrimes closescript(); 8021556Srgrimes INTON; 803223024Sjilles forcelocal = 0; 8041556Srgrimes clear_traps(); 8051556Srgrimes#if JOBS 8061556Srgrimes jobctl = 0; /* do job control only in root shell */ 8071556Srgrimes if (wasroot && mode != FORK_NOJOB && mflag) { 8081556Srgrimes if (jp == NULL || jp->nprocs == 0) 8091556Srgrimes pgrp = getpid(); 8101556Srgrimes else 8111556Srgrimes pgrp = jp->ps[0].pid; 81221352Ssteve if (setpgid(0, pgrp) == 0 && mode == FORK_FG) { 8131556Srgrimes /*** this causes superfluous TIOCSPGRPS ***/ 81499762Stjr if (tcsetpgrp(ttyfd, pgrp) < 0) 81520425Ssteve error("tcsetpgrp failed, errno=%d", errno); 8161556Srgrimes } 8171556Srgrimes setsignal(SIGTSTP); 8181556Srgrimes setsignal(SIGTTOU); 8191556Srgrimes } else if (mode == FORK_BG) { 8201556Srgrimes ignoresig(SIGINT); 8211556Srgrimes ignoresig(SIGQUIT); 8221556Srgrimes if ((jp == NULL || jp->nprocs == 0) && 8231556Srgrimes ! fd0_redirected_p ()) { 8241556Srgrimes close(0); 82569793Sobrien if (open(_PATH_DEVNULL, O_RDONLY) != 0) 826222684Sjilles error("cannot open %s: %s", 82769793Sobrien _PATH_DEVNULL, strerror(errno)); 8281556Srgrimes } 8291556Srgrimes } 8301556Srgrimes#else 8311556Srgrimes if (mode == FORK_BG) { 8321556Srgrimes ignoresig(SIGINT); 8331556Srgrimes ignoresig(SIGQUIT); 8341556Srgrimes if ((jp == NULL || jp->nprocs == 0) && 8351556Srgrimes ! fd0_redirected_p ()) { 8361556Srgrimes close(0); 83769793Sobrien if (open(_PATH_DEVNULL, O_RDONLY) != 0) 838222684Sjilles error("cannot open %s: %s", 83969793Sobrien _PATH_DEVNULL, strerror(errno)); 8401556Srgrimes } 8411556Srgrimes } 8421556Srgrimes#endif 843102051Stjr INTOFF; 844102051Stjr for (i = njobs, p = jobtab ; --i >= 0 ; p++) 845102051Stjr if (p->used) 846102051Stjr freejob(p); 847102051Stjr INTON; 8481556Srgrimes if (wasroot && iflag) { 8491556Srgrimes setsignal(SIGINT); 8501556Srgrimes setsignal(SIGQUIT); 8511556Srgrimes setsignal(SIGTERM); 8521556Srgrimes } 8531556Srgrimes return pid; 8541556Srgrimes } 8551556Srgrimes if (rootshell && mode != FORK_NOJOB && mflag) { 8561556Srgrimes if (jp == NULL || jp->nprocs == 0) 8571556Srgrimes pgrp = pid; 8581556Srgrimes else 8591556Srgrimes pgrp = jp->ps[0].pid; 86017987Speter setpgid(pid, pgrp); 8611556Srgrimes } 862209600Sjilles if (mode == FORK_BG) { 863209600Sjilles if (bgjob != NULL && bgjob->state == JOBDONE && 864209600Sjilles !bgjob->remembered && !iflag) 865209600Sjilles freejob(bgjob); 8661556Srgrimes backgndpid = pid; /* set $! */ 867209600Sjilles bgjob = jp; 868209600Sjilles } 8691556Srgrimes if (jp) { 8701556Srgrimes struct procstat *ps = &jp->ps[jp->nprocs++]; 8711556Srgrimes ps->pid = pid; 8721556Srgrimes ps->status = -1; 8731556Srgrimes ps->cmd = nullstr; 8741556Srgrimes if (iflag && rootshell && n) 8751556Srgrimes ps->cmd = commandtext(n); 876100305Stjr jp->foreground = mode == FORK_FG; 87797659Stjr#if JOBS 87897659Stjr setcurjob(jp); 87997659Stjr#endif 8801556Srgrimes } 8811556Srgrimes INTON; 882100308Stjr TRACE(("In parent shell: child = %d\n", (int)pid)); 8831556Srgrimes return pid; 8841556Srgrimes} 8851556Srgrimes 8861556Srgrimes 8871556Srgrimes 8881556Srgrimes/* 8891556Srgrimes * Wait for job to finish. 8901556Srgrimes * 8911556Srgrimes * Under job control we have the problem that while a child process is 8921556Srgrimes * running interrupts generated by the user are sent to the child but not 8931556Srgrimes * to the shell. This means that an infinite loop started by an inter- 8941556Srgrimes * active user may be hard to kill. With job control turned off, an 8951556Srgrimes * interactive user may place an interactive program inside a loop. If 8961556Srgrimes * the interactive program catches interrupts, the user doesn't want 8971556Srgrimes * these interrupts to also abort the loop. The approach we take here 8981556Srgrimes * is to have the shell ignore interrupt signals while waiting for a 89946684Skris * foreground process to terminate, and then send itself an interrupt 9001556Srgrimes * signal if the child process was terminated by an interrupt signal. 9011556Srgrimes * Unfortunately, some programs want to do a bit of cleanup and then 9021556Srgrimes * exit on interrupt; unless these processes terminate themselves by 9031556Srgrimes * sending a signal to themselves (instead of calling exit) they will 9041556Srgrimes * confuse this approach. 9051556Srgrimes */ 9061556Srgrimes 9071556Srgrimesint 90890111Simpwaitforjob(struct job *jp, int *origstatus) 90945916Scracauer{ 9101556Srgrimes#if JOBS 911100308Stjr pid_t mypgrp = getpgrp(); 912208881Sjilles int propagate_int = jp->jobctl && jp->foreground; 9131556Srgrimes#endif 9141556Srgrimes int status; 9151556Srgrimes int st; 9161556Srgrimes 9171556Srgrimes INTOFF; 918213775Sjhb TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1)); 91938950Scracauer while (jp->state == 0) 92038950Scracauer if (dowait(1, jp) == -1) 92138950Scracauer dotrap(); 9221556Srgrimes#if JOBS 9231556Srgrimes if (jp->jobctl) { 92499762Stjr if (tcsetpgrp(ttyfd, mypgrp) < 0) 92520425Ssteve error("tcsetpgrp failed, errno=%d\n", errno); 9261556Srgrimes } 9271556Srgrimes if (jp->state == JOBSTOPPED) 92897659Stjr setcurjob(jp); 9291556Srgrimes#endif 9301556Srgrimes status = jp->ps[jp->nprocs - 1].status; 93145916Scracauer if (origstatus != NULL) 93245916Scracauer *origstatus = status; 9331556Srgrimes /* convert to 8 bits */ 93426104Ssteve if (WIFEXITED(status)) 93526104Ssteve st = WEXITSTATUS(status); 9361556Srgrimes#if JOBS 93726104Ssteve else if (WIFSTOPPED(status)) 93826104Ssteve st = WSTOPSIG(status) + 128; 9391556Srgrimes#endif 9401556Srgrimes else 94126104Ssteve st = WTERMSIG(status) + 128; 9421556Srgrimes if (! JOBS || jp->state == JOBDONE) 9431556Srgrimes freejob(jp); 94438521Scracauer if (int_pending()) { 945216400Sjilles if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGINT) 94638521Scracauer CLEAR_PENDING_INT; 94738521Scracauer } 948208881Sjilles#if JOBS 949208881Sjilles else if (rootshell && iflag && propagate_int && 950208881Sjilles WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 951208881Sjilles kill(getpid(), SIGINT); 952208881Sjilles#endif 9531556Srgrimes INTON; 9541556Srgrimes return st; 9551556Srgrimes} 9561556Srgrimes 9571556Srgrimes 9581556Srgrimes 9591556Srgrimes/* 9601556Srgrimes * Wait for a process to terminate. 9611556Srgrimes */ 9621556Srgrimes 963213811Sobrienstatic pid_t 96490111Simpdowait(int block, struct job *job) 96517987Speter{ 966100308Stjr pid_t pid; 9671556Srgrimes int status; 9681556Srgrimes struct procstat *sp; 9691556Srgrimes struct job *jp; 9701556Srgrimes struct job *thisjob; 9711556Srgrimes int done; 9721556Srgrimes int stopped; 97326104Ssteve int sig; 974216217Sjilles int coredump; 9751556Srgrimes 97638950Scracauer in_dowait++; 9771556Srgrimes TRACE(("dowait(%d) called\n", block)); 9781556Srgrimes do { 9791556Srgrimes pid = waitproc(block, &status); 980100308Stjr TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 98172086Scracauer } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) || 982125501Scracauer (pid > 0 && WIFSTOPPED(status) && !iflag)); 98338950Scracauer in_dowait--; 984153417Smaxim if (pid == -1 && errno == ECHILD && job != NULL) 985153417Smaxim job->state = JOBDONE; 98638521Scracauer if (breakwaitcmd != 0) { 98738521Scracauer breakwaitcmd = 0; 988138312Smaxim if (pid <= 0) 989138312Smaxim return -1; 99038521Scracauer } 9911556Srgrimes if (pid <= 0) 9921556Srgrimes return pid; 9931556Srgrimes INTOFF; 9941556Srgrimes thisjob = NULL; 9951556Srgrimes for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 996216208Sjilles if (jp->used && jp->nprocs > 0) { 9971556Srgrimes done = 1; 9981556Srgrimes stopped = 1; 9991556Srgrimes for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 10001556Srgrimes if (sp->pid == -1) 10011556Srgrimes continue; 10021556Srgrimes if (sp->pid == pid) { 100326104Ssteve TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 1004100308Stjr (int)pid, sp->status, 1005100308Stjr status)); 10061556Srgrimes sp->status = status; 10071556Srgrimes thisjob = jp; 10081556Srgrimes } 10091556Srgrimes if (sp->status == -1) 10101556Srgrimes stopped = 0; 101126104Ssteve else if (WIFSTOPPED(sp->status)) 10121556Srgrimes done = 0; 10131556Srgrimes } 10141556Srgrimes if (stopped) { /* stopped or done */ 10151556Srgrimes int state = done? JOBDONE : JOBSTOPPED; 10161556Srgrimes if (jp->state != state) { 1017213775Sjhb TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 10181556Srgrimes jp->state = state; 1019209600Sjilles if (jp != job) { 1020209600Sjilles if (done && !jp->remembered && 1021209600Sjilles !iflag && jp != bgjob) 1022209600Sjilles freejob(jp); 10231556Srgrimes#if JOBS 1024209600Sjilles else if (done) 1025209600Sjilles deljob(jp); 10261556Srgrimes#endif 1027209600Sjilles } 10281556Srgrimes } 10291556Srgrimes } 10301556Srgrimes } 10311556Srgrimes } 10321556Srgrimes INTON; 1033216217Sjilles if (!thisjob || thisjob->state == 0) 1034216217Sjilles ; 1035216217Sjilles else if ((!rootshell || !iflag || thisjob == job) && 1036216217Sjilles thisjob->foreground && thisjob->state != JOBSTOPPED) { 1037216217Sjilles sig = 0; 1038216217Sjilles coredump = 0; 1039216217Sjilles for (sp = thisjob->ps; sp < thisjob->ps + thisjob->nprocs; sp++) 1040216217Sjilles if (WIFSIGNALED(sp->status)) { 1041216217Sjilles sig = WTERMSIG(sp->status); 1042216217Sjilles coredump = WCOREDUMP(sp->status); 1043216217Sjilles } 1044216217Sjilles if (sig > 0 && sig != SIGINT && sig != SIGPIPE) { 1045216217Sjilles if (sig < sys_nsig && sys_siglist[sig]) 1046218105Sjilles out2str(sys_siglist[sig]); 104726104Ssteve else 1048218105Sjilles outfmt(out2, "Signal %d", sig); 1049216217Sjilles if (coredump) 1050218105Sjilles out2str(" (core dumped)"); 1051218105Sjilles out2c('\n'); 1052218105Sjilles flushout(out2); 10531556Srgrimes } 10541556Srgrimes } else { 1055109627Stjr TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job)); 1056216217Sjilles thisjob->changed = 1; 10571556Srgrimes } 10581556Srgrimes return pid; 10591556Srgrimes} 10601556Srgrimes 10611556Srgrimes 10621556Srgrimes 10631556Srgrimes/* 10641556Srgrimes * Do a wait system call. If job control is compiled in, we accept 10651556Srgrimes * stopped processes. If block is zero, we return a value of zero 10661556Srgrimes * rather than blocking. 10671556Srgrimes */ 1068213811Sobrienstatic pid_t 106990111Simpwaitproc(int block, int *status) 107017987Speter{ 10711556Srgrimes int flags; 10721556Srgrimes 10731556Srgrimes#if JOBS 10741556Srgrimes flags = WUNTRACED; 10751556Srgrimes#else 10761556Srgrimes flags = 0; 10771556Srgrimes#endif 10781556Srgrimes if (block == 0) 10791556Srgrimes flags |= WNOHANG; 10801556Srgrimes return wait3(status, flags, (struct rusage *)NULL); 10811556Srgrimes} 10821556Srgrimes 10831556Srgrimes/* 10841556Srgrimes * return 1 if there are stopped jobs, otherwise 0 10851556Srgrimes */ 10861556Srgrimesint job_warning = 0; 10871556Srgrimesint 108890111Simpstoppedjobs(void) 10891556Srgrimes{ 109025222Ssteve int jobno; 109125222Ssteve struct job *jp; 10921556Srgrimes 10931556Srgrimes if (job_warning) 10941556Srgrimes return (0); 10951556Srgrimes for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 10961556Srgrimes if (jp->used == 0) 10971556Srgrimes continue; 10981556Srgrimes if (jp->state == JOBSTOPPED) { 1099199629Sjilles out2fmt_flush("You have stopped jobs.\n"); 11001556Srgrimes job_warning = 2; 11011556Srgrimes return (1); 11021556Srgrimes } 11031556Srgrimes } 11041556Srgrimes 11051556Srgrimes return (0); 11061556Srgrimes} 11071556Srgrimes 1108208489Sjilles 1109213811Sobrienstatic void 1110208489Sjillescheckzombies(void) 1111208489Sjilles{ 1112208489Sjilles while (njobs > 0 && dowait(0, NULL) > 0) 1113208489Sjilles ; 1114208489Sjilles} 1115208489Sjilles 1116208489Sjilles 1117209600Sjillesint 1118209600Sjillesbackgndpidset(void) 1119209600Sjilles{ 1120209600Sjilles return backgndpid != -1; 1121209600Sjilles} 1122209600Sjilles 1123209600Sjilles 1124209600Sjillespid_t 1125209600Sjillesbackgndpidval(void) 1126209600Sjilles{ 1127223024Sjilles if (bgjob != NULL && !forcelocal) 1128209600Sjilles bgjob->remembered = 1; 1129209600Sjilles return backgndpid; 1130209600Sjilles} 1131209600Sjilles 11321556Srgrimes/* 11331556Srgrimes * Return a string identifying a command (to be printed by the 11341556Srgrimes * jobs command. 11351556Srgrimes */ 11361556Srgrimes 1137213760Sobrienstatic char *cmdnextc; 1138213760Sobrienstatic int cmdnleft; 11391556Srgrimes#define MAXCMDTEXT 200 11401556Srgrimes 11411556Srgrimeschar * 114290111Simpcommandtext(union node *n) 114390111Simp{ 11441556Srgrimes char *name; 11451556Srgrimes 11461556Srgrimes cmdnextc = name = ckmalloc(MAXCMDTEXT); 11471556Srgrimes cmdnleft = MAXCMDTEXT - 4; 11481556Srgrimes cmdtxt(n); 11491556Srgrimes *cmdnextc = '\0'; 11501556Srgrimes return name; 11511556Srgrimes} 11521556Srgrimes 11531556Srgrimes 1154213811Sobrienstatic void 115590111Simpcmdtxt(union node *n) 115690111Simp{ 11571556Srgrimes union node *np; 11581556Srgrimes struct nodelist *lp; 1159201053Sjilles const char *p; 11601556Srgrimes int i; 11611556Srgrimes char s[2]; 11621556Srgrimes 11631556Srgrimes if (n == NULL) 11641556Srgrimes return; 11651556Srgrimes switch (n->type) { 11661556Srgrimes case NSEMI: 11671556Srgrimes cmdtxt(n->nbinary.ch1); 11681556Srgrimes cmdputs("; "); 11691556Srgrimes cmdtxt(n->nbinary.ch2); 11701556Srgrimes break; 11711556Srgrimes case NAND: 11721556Srgrimes cmdtxt(n->nbinary.ch1); 11731556Srgrimes cmdputs(" && "); 11741556Srgrimes cmdtxt(n->nbinary.ch2); 11751556Srgrimes break; 11761556Srgrimes case NOR: 11771556Srgrimes cmdtxt(n->nbinary.ch1); 11781556Srgrimes cmdputs(" || "); 11791556Srgrimes cmdtxt(n->nbinary.ch2); 11801556Srgrimes break; 11811556Srgrimes case NPIPE: 11821556Srgrimes for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 11831556Srgrimes cmdtxt(lp->n); 11841556Srgrimes if (lp->next) 11851556Srgrimes cmdputs(" | "); 11861556Srgrimes } 11871556Srgrimes break; 11881556Srgrimes case NSUBSHELL: 11891556Srgrimes cmdputs("("); 11901556Srgrimes cmdtxt(n->nredir.n); 11911556Srgrimes cmdputs(")"); 11921556Srgrimes break; 11931556Srgrimes case NREDIR: 11941556Srgrimes case NBACKGND: 11951556Srgrimes cmdtxt(n->nredir.n); 11961556Srgrimes break; 11971556Srgrimes case NIF: 11981556Srgrimes cmdputs("if "); 11991556Srgrimes cmdtxt(n->nif.test); 12001556Srgrimes cmdputs("; then "); 12011556Srgrimes cmdtxt(n->nif.ifpart); 12021556Srgrimes cmdputs("..."); 12031556Srgrimes break; 12041556Srgrimes case NWHILE: 12051556Srgrimes cmdputs("while "); 12061556Srgrimes goto until; 12071556Srgrimes case NUNTIL: 12081556Srgrimes cmdputs("until "); 12091556Srgrimesuntil: 12101556Srgrimes cmdtxt(n->nbinary.ch1); 12111556Srgrimes cmdputs("; do "); 12121556Srgrimes cmdtxt(n->nbinary.ch2); 12131556Srgrimes cmdputs("; done"); 12141556Srgrimes break; 12151556Srgrimes case NFOR: 12161556Srgrimes cmdputs("for "); 12171556Srgrimes cmdputs(n->nfor.var); 12181556Srgrimes cmdputs(" in ..."); 12191556Srgrimes break; 12201556Srgrimes case NCASE: 12211556Srgrimes cmdputs("case "); 12221556Srgrimes cmdputs(n->ncase.expr->narg.text); 12231556Srgrimes cmdputs(" in ..."); 12241556Srgrimes break; 12251556Srgrimes case NDEFUN: 12261556Srgrimes cmdputs(n->narg.text); 12271556Srgrimes cmdputs("() ..."); 12281556Srgrimes break; 12291556Srgrimes case NCMD: 12301556Srgrimes for (np = n->ncmd.args ; np ; np = np->narg.next) { 12311556Srgrimes cmdtxt(np); 12321556Srgrimes if (np->narg.next) 12331556Srgrimes cmdputs(" "); 12341556Srgrimes } 12351556Srgrimes for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 12361556Srgrimes cmdputs(" "); 12371556Srgrimes cmdtxt(np); 12381556Srgrimes } 12391556Srgrimes break; 12401556Srgrimes case NARG: 12411556Srgrimes cmdputs(n->narg.text); 12421556Srgrimes break; 12431556Srgrimes case NTO: 12441556Srgrimes p = ">"; i = 1; goto redir; 12451556Srgrimes case NAPPEND: 12461556Srgrimes p = ">>"; i = 1; goto redir; 12471556Srgrimes case NTOFD: 12481556Srgrimes p = ">&"; i = 1; goto redir; 124996922Stjr case NCLOBBER: 125096922Stjr p = ">|"; i = 1; goto redir; 12511556Srgrimes case NFROM: 12521556Srgrimes p = "<"; i = 0; goto redir; 125366612Sbrian case NFROMTO: 125466612Sbrian p = "<>"; i = 0; goto redir; 12551556Srgrimes case NFROMFD: 12561556Srgrimes p = "<&"; i = 0; goto redir; 12571556Srgrimesredir: 12581556Srgrimes if (n->nfile.fd != i) { 12591556Srgrimes s[0] = n->nfile.fd + '0'; 12601556Srgrimes s[1] = '\0'; 12611556Srgrimes cmdputs(s); 12621556Srgrimes } 12631556Srgrimes cmdputs(p); 12641556Srgrimes if (n->type == NTOFD || n->type == NFROMFD) { 126599634Stjr if (n->ndup.dupfd >= 0) 126699634Stjr s[0] = n->ndup.dupfd + '0'; 126799634Stjr else 126899634Stjr s[0] = '-'; 12691556Srgrimes s[1] = '\0'; 12701556Srgrimes cmdputs(s); 12711556Srgrimes } else { 12721556Srgrimes cmdtxt(n->nfile.fname); 12731556Srgrimes } 12741556Srgrimes break; 12751556Srgrimes case NHERE: 12761556Srgrimes case NXHERE: 12771556Srgrimes cmdputs("<<..."); 12781556Srgrimes break; 12791556Srgrimes default: 12801556Srgrimes cmdputs("???"); 12811556Srgrimes break; 12821556Srgrimes } 12831556Srgrimes} 12841556Srgrimes 12851556Srgrimes 12861556Srgrimes 1287213811Sobrienstatic void 1288201053Sjillescmdputs(const char *s) 128990111Simp{ 1290201053Sjilles const char *p; 1291201053Sjilles char *q; 129225222Ssteve char c; 12931556Srgrimes int subtype = 0; 12941556Srgrimes 12951556Srgrimes if (cmdnleft <= 0) 12961556Srgrimes return; 12971556Srgrimes p = s; 12981556Srgrimes q = cmdnextc; 12991556Srgrimes while ((c = *p++) != '\0') { 13001556Srgrimes if (c == CTLESC) 13011556Srgrimes *q++ = *p++; 13021556Srgrimes else if (c == CTLVAR) { 13031556Srgrimes *q++ = '$'; 13041556Srgrimes if (--cmdnleft > 0) 13051556Srgrimes *q++ = '{'; 13061556Srgrimes subtype = *p++; 1307216246Sjilles if ((subtype & VSTYPE) == VSLENGTH && --cmdnleft > 0) 1308216246Sjilles *q++ = '#'; 13091556Srgrimes } else if (c == '=' && subtype != 0) { 1310216246Sjilles *q = "}-+?=##%%\0X"[(subtype & VSTYPE) - VSNORMAL]; 1311216246Sjilles if (*q) 1312216246Sjilles q++; 1313216246Sjilles else 1314216246Sjilles cmdnleft++; 1315216246Sjilles if (((subtype & VSTYPE) == VSTRIMLEFTMAX || 1316216246Sjilles (subtype & VSTYPE) == VSTRIMRIGHTMAX) && 1317216246Sjilles --cmdnleft > 0) 1318216246Sjilles *q = q[-1], q++; 13191556Srgrimes subtype = 0; 13201556Srgrimes } else if (c == CTLENDVAR) { 13211556Srgrimes *q++ = '}'; 1322216246Sjilles } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) { 1323216246Sjilles cmdnleft -= 5; 1324216246Sjilles if (cmdnleft > 0) { 1325216246Sjilles *q++ = '$'; 1326216246Sjilles *q++ = '('; 1327216246Sjilles *q++ = '.'; 1328216246Sjilles *q++ = '.'; 1329216246Sjilles *q++ = '.'; 1330216246Sjilles *q++ = ')'; 1331216246Sjilles } 1332216246Sjilles } else if (c == CTLARI) { 1333216246Sjilles cmdnleft -= 2; 1334216246Sjilles if (cmdnleft > 0) { 1335216246Sjilles *q++ = '$'; 1336216246Sjilles *q++ = '('; 1337216246Sjilles *q++ = '('; 1338216246Sjilles } 1339216246Sjilles p++; 1340216246Sjilles } else if (c == CTLENDARI) { 1341216246Sjilles if (--cmdnleft > 0) { 1342216246Sjilles *q++ = ')'; 1343216246Sjilles *q++ = ')'; 1344216246Sjilles } 1345216246Sjilles } else if (c == CTLQUOTEMARK || c == CTLQUOTEEND) 1346216246Sjilles cmdnleft++; /* ignore */ 13471556Srgrimes else 13481556Srgrimes *q++ = c; 13491556Srgrimes if (--cmdnleft <= 0) { 13501556Srgrimes *q++ = '.'; 13511556Srgrimes *q++ = '.'; 13521556Srgrimes *q++ = '.'; 13531556Srgrimes break; 13541556Srgrimes } 13551556Srgrimes } 13561556Srgrimes cmdnextc = q; 13571556Srgrimes} 1358