jobs.c revision 216629
155714Skris/*- 255714Skris * Copyright (c) 1991, 1993 355714Skris * The Regents of the University of California. All rights reserved. 455714Skris * 555714Skris * This code is derived from software contributed to Berkeley by 655714Skris * Kenneth Almquist. 755714Skris * 855714Skris * Redistribution and use in source and binary forms, with or without 955714Skris * modification, are permitted provided that the following conditions 1055714Skris * are met: 1155714Skris * 1. Redistributions of source code must retain the above copyright 1255714Skris * notice, this list of conditions and the following disclaimer. 1355714Skris * 2. Redistributions in binary form must reproduce the above copyright 1455714Skris * notice, this list of conditions and the following disclaimer in the 1555714Skris * documentation and/or other materials provided with the distribution. 1655714Skris * 4. Neither the name of the University nor the names of its contributors 1755714Skris * may be used to endorse or promote products derived from this software 1855714Skris * without specific prior written permission. 1955714Skris * 2055714Skris * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2155714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2255714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2355714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2455714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2555714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2655714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2755714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2855714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2955714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3055714Skris * SUCH DAMAGE. 3155714Skris */ 3255714Skris 3355714Skris#ifndef lint 3455714Skris#if 0 3555714Skrisstatic char sccsid[] = "@(#)jobs.c 8.5 (Berkeley) 5/4/95"; 3655714Skris#endif 3755714Skris#endif /* not lint */ 3855714Skris#include <sys/cdefs.h> 3955714Skris__FBSDID("$FreeBSD: head/bin/sh/jobs.c 216629 2010-12-21 22:47:34Z jilles $"); 4055714Skris 4155714Skris#include <sys/ioctl.h> 4255714Skris#include <sys/param.h> 4355714Skris#include <sys/resource.h> 4455714Skris#include <sys/time.h> 4555714Skris#include <sys/wait.h> 4655714Skris#include <errno.h> 4755714Skris#include <fcntl.h> 4855714Skris#include <paths.h> 4955714Skris#include <signal.h> 5055714Skris#include <stddef.h> 5155714Skris#include <stdlib.h> 5255714Skris#include <unistd.h> 5355714Skris 5455714Skris#include "shell.h" 5555714Skris#if JOBS 5655714Skris#include <termios.h> 5755714Skris#undef CEOF /* syntax.h redefines this */ 5855714Skris#endif 5955714Skris#include "redir.h" 6055714Skris#include "show.h" 6155714Skris#include "main.h" 6255714Skris#include "parser.h" 6355714Skris#include "nodes.h" 6455714Skris#include "jobs.h" 6555714Skris#include "options.h" 6655714Skris#include "trap.h" 6755714Skris#include "syntax.h" 6855714Skris#include "input.h" 6955714Skris#include "output.h" 7055714Skris#include "memalloc.h" 7155714Skris#include "error.h" 7255714Skris#include "mystring.h" 7355714Skris 7455714Skris 7555714Skrisstatic struct job *jobtab; /* array of jobs */ 7655714Skrisstatic int njobs; /* size of array */ 7755714SkrisMKINIT pid_t backgndpid = -1; /* pid of last background process */ 7855714SkrisMKINIT struct job *bgjob = NULL; /* last background process */ 7955714Skris#if JOBS 8055714Skrisstatic struct job *jobmru; /* most recently used job list */ 8155714Skrisstatic pid_t initialpgrp; /* pgrp of shell on invocation */ 8255714Skris#endif 8355714Skrisint in_waitcmd = 0; /* are we in waitcmd()? */ 8455714Skrisint in_dowait = 0; /* are we in dowait()? */ 8555714Skrisvolatile sig_atomic_t breakwaitcmd = 0; /* should wait be terminated? */ 8655714Skrisstatic int ttyfd = -1; 8755714Skris 8855714Skris#if JOBS 8955714Skrisstatic void restartjob(struct job *); 9055714Skris#endif 9155714Skrisstatic void freejob(struct job *); 9255714Skrisstatic struct job *getjob(char *); 9355714Skrisstatic pid_t dowait(int, struct job *); 9455714Skrisstatic pid_t waitproc(int, int *); 9555714Skrisstatic void checkzombies(void); 9655714Skrisstatic void cmdtxt(union node *); 9755714Skrisstatic void cmdputs(const char *); 9855714Skris#if JOBS 9955714Skrisstatic void setcurjob(struct job *); 10055714Skrisstatic void deljob(struct job *); 10155714Skrisstatic struct job *getcurjob(struct job *); 10255714Skris#endif 10355714Skrisstatic void printjobcmd(struct job *); 10455714Skrisstatic void showjob(struct job *, int); 10555714Skris 10655714Skris 10755714Skris/* 10855714Skris * Turn job control on and off. 10955714Skris */ 11055714Skris 11155714SkrisMKINIT int jobctl; 11255714Skris 11355714Skris#if JOBS 11455714Skrisvoid 11555714Skrissetjobctl(int on) 11655714Skris{ 11755714Skris int i; 11855714Skris 11955714Skris if (on == jobctl || rootshell == 0) 12055714Skris return; 12155714Skris if (on) { 12255714Skris if (ttyfd != -1) 12355714Skris close(ttyfd); 12455714Skris if ((ttyfd = open(_PATH_TTY, O_RDWR)) < 0) { 12555714Skris i = 0; 12655714Skris while (i <= 2 && !isatty(i)) 12755714Skris i++; 12855714Skris if (i > 2 || (ttyfd = fcntl(i, F_DUPFD, 10)) < 0) 12955714Skris goto out; 13055714Skris } 13155714Skris if (ttyfd < 10) { 13255714Skris /* 13355714Skris * Keep our TTY file descriptor out of the way of 13455714Skris * the user's redirections. 13555714Skris */ 13655714Skris if ((i = fcntl(ttyfd, F_DUPFD, 10)) < 0) { 13755714Skris close(ttyfd); 13855714Skris ttyfd = -1; 13955714Skris goto out; 14055714Skris } 14155714Skris close(ttyfd); 14255714Skris ttyfd = i; 14355714Skris } 14455714Skris if (fcntl(ttyfd, F_SETFD, FD_CLOEXEC) < 0) { 14555714Skris close(ttyfd); 14655714Skris ttyfd = -1; 14755714Skris goto out; 14855714Skris } 14955714Skris do { /* while we are in the background */ 15055714Skris initialpgrp = tcgetpgrp(ttyfd); 15155714Skris if (initialpgrp < 0) { 15255714Skrisout: out2fmt_flush("sh: can't access tty; job control turned off\n"); 15355714Skris mflag = 0; 15455714Skris return; 15555714Skris } 15655714Skris if (initialpgrp != getpgrp()) { 15755714Skris kill(0, SIGTTIN); 15855714Skris continue; 15955714Skris } 16055714Skris } while (0); 16155714Skris setsignal(SIGTSTP); 16255714Skris setsignal(SIGTTOU); 16355714Skris setsignal(SIGTTIN); 16455714Skris setpgid(0, rootpid); 16555714Skris tcsetpgrp(ttyfd, rootpid); 16655714Skris } else { /* turning job control off */ 16755714Skris setpgid(0, initialpgrp); 16855714Skris tcsetpgrp(ttyfd, initialpgrp); 16955714Skris close(ttyfd); 17055714Skris ttyfd = -1; 17155714Skris setsignal(SIGTSTP); 17255714Skris setsignal(SIGTTOU); 17355714Skris setsignal(SIGTTIN); 17455714Skris } 17555714Skris jobctl = on; 17655714Skris} 17755714Skris#endif 17855714Skris 17955714Skris 18055714Skris#ifdef mkinit 18155714SkrisINCLUDE <sys/types.h> 18255714SkrisINCLUDE <stdlib.h> 18355714Skris 18455714SkrisSHELLPROC { 18555714Skris backgndpid = -1; 18655714Skris bgjob = NULL; 18755714Skris#if JOBS 18855714Skris jobctl = 0; 18955714Skris#endif 19055714Skris} 19155714Skris 19255714Skris#endif 19355714Skris 19455714Skris 19555714Skris 19655714Skris#if JOBS 19755714Skrisint 19855714Skrisfgcmd(int argc __unused, char **argv) 19955714Skris{ 20055714Skris struct job *jp; 20155714Skris pid_t pgrp; 20255714Skris int status; 20355714Skris 20455714Skris jp = getjob(argv[1]); 20555714Skris if (jp->jobctl == 0) 20655714Skris error("job not created under job control"); 20755714Skris printjobcmd(jp); 20855714Skris flushout(&output); 20955714Skris pgrp = jp->ps[0].pid; 21055714Skris tcsetpgrp(ttyfd, pgrp); 21155714Skris restartjob(jp); 21255714Skris jp->foreground = 1; 21355714Skris INTOFF; 21455714Skris status = waitforjob(jp, (int *)NULL); 21555714Skris INTON; 21655714Skris return status; 21755714Skris} 21855714Skris 21955714Skris 22055714Skrisint 22155714Skrisbgcmd(int argc, char **argv) 22255714Skris{ 22355714Skris struct job *jp; 22455714Skris 22555714Skris do { 22655714Skris jp = getjob(*++argv); 22755714Skris if (jp->jobctl == 0) 22855714Skris error("job not created under job control"); 22955714Skris if (jp->state == JOBDONE) 23055714Skris continue; 23155714Skris restartjob(jp); 23255714Skris jp->foreground = 0; 23355714Skris out1fmt("[%td] ", jp - jobtab + 1); 23455714Skris printjobcmd(jp); 23555714Skris } while (--argc > 1); 23655714Skris return 0; 23755714Skris} 23855714Skris 23955714Skris 24055714Skrisstatic void 24155714Skrisrestartjob(struct job *jp) 24255714Skris{ 24355714Skris struct procstat *ps; 24455714Skris int i; 24555714Skris 24655714Skris if (jp->state == JOBDONE) 24755714Skris return; 24855714Skris setcurjob(jp); 24955714Skris INTOFF; 25055714Skris kill(-jp->ps[0].pid, SIGCONT); 25155714Skris for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 25255714Skris if (WIFSTOPPED(ps->status)) { 25355714Skris ps->status = -1; 25455714Skris jp->state = 0; 25555714Skris } 25655714Skris } 25755714Skris INTON; 25855714Skris} 25955714Skris#endif 26055714Skris 26155714Skris 26255714Skrisint 26355714Skrisjobscmd(int argc, char *argv[]) 26455714Skris{ 26555714Skris char *id; 26655714Skris int ch, mode; 26755714Skris 26855714Skris optind = optreset = 1; 26955714Skris opterr = 0; 27055714Skris mode = SHOWJOBS_DEFAULT; 27155714Skris while ((ch = getopt(argc, argv, "lps")) != -1) { 27255714Skris switch (ch) { 27355714Skris case 'l': 27455714Skris mode = SHOWJOBS_VERBOSE; 27555714Skris break; 27655714Skris case 'p': 27755714Skris mode = SHOWJOBS_PGIDS; 27855714Skris break; 27955714Skris case 's': 28055714Skris mode = SHOWJOBS_PIDS; 28155714Skris break; 28255714Skris case '?': 28355714Skris default: 28455714Skris error("unknown option: -%c", optopt); 28555714Skris } 28655714Skris } 28755714Skris argc -= optind; 28855714Skris argv += optind; 28955714Skris 29055714Skris if (argc == 0) 29155714Skris showjobs(0, mode); 29255714Skris else 29355714Skris while ((id = *argv++) != NULL) 29455714Skris showjob(getjob(id), mode); 29555714Skris 29655714Skris return (0); 29755714Skris} 29855714Skris 29955714Skrisstatic void 30055714Skrisprintjobcmd(struct job *jp) 30155714Skris{ 30255714Skris struct procstat *ps; 30355714Skris int i; 30455714Skris 30555714Skris for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) { 30655714Skris out1str(ps->cmd); 30755714Skris if (i > 0) 30855714Skris out1str(" | "); 30955714Skris } 31055714Skris out1c('\n'); 31155714Skris} 31255714Skris 31355714Skrisstatic void 31455714Skrisshowjob(struct job *jp, int mode) 31555714Skris{ 31655714Skris char s[64]; 31755714Skris char statestr[64]; 31855714Skris struct procstat *ps; 31955714Skris struct job *j; 32055714Skris int col, curr, i, jobno, prev, procno; 32155714Skris char c; 32255714Skris 32355714Skris procno = (mode == SHOWJOBS_PGIDS) ? 1 : jp->nprocs; 32455714Skris jobno = jp - jobtab + 1; 32555714Skris curr = prev = 0; 32655714Skris#if JOBS 32755714Skris if ((j = getcurjob(NULL)) != NULL) { 32855714Skris curr = j - jobtab + 1; 32955714Skris if ((j = getcurjob(j)) != NULL) 33055714Skris prev = j - jobtab + 1; 33155714Skris } 33255714Skris#endif 33355714Skris ps = jp->ps + jp->nprocs - 1; 33455714Skris if (jp->state == 0) { 33555714Skris strcpy(statestr, "Running"); 33655714Skris#if JOBS 33755714Skris } else if (jp->state == JOBSTOPPED) { 33855714Skris while (!WIFSTOPPED(ps->status) && ps > jp->ps) 33955714Skris ps--; 34055714Skris if (WIFSTOPPED(ps->status)) 34155714Skris i = WSTOPSIG(ps->status); 34255714Skris else 34355714Skris i = -1; 34455714Skris if (i > 0 && i < sys_nsig && sys_siglist[i]) 34555714Skris strcpy(statestr, sys_siglist[i]); 34655714Skris else 34755714Skris strcpy(statestr, "Suspended"); 34855714Skris#endif 34955714Skris } else if (WIFEXITED(ps->status)) { 35055714Skris if (WEXITSTATUS(ps->status) == 0) 35155714Skris strcpy(statestr, "Done"); 35255714Skris else 35355714Skris fmtstr(statestr, 64, "Done(%d)", 35455714Skris WEXITSTATUS(ps->status)); 35555714Skris } else { 35655714Skris i = WTERMSIG(ps->status); 35755714Skris if (i > 0 && i < sys_nsig && sys_siglist[i]) 35855714Skris strcpy(statestr, sys_siglist[i]); 35955714Skris else 36055714Skris fmtstr(statestr, 64, "Signal %d", i); 36155714Skris if (WCOREDUMP(ps->status)) 36255714Skris strcat(statestr, " (core dumped)"); 36355714Skris } 36455714Skris 36555714Skris for (ps = jp->ps ; ; ps++) { /* for each process */ 36655714Skris if (mode == SHOWJOBS_PIDS || mode == SHOWJOBS_PGIDS) { 36755714Skris out1fmt("%d\n", (int)ps->pid); 36855714Skris goto skip; 36955714Skris } 37055714Skris if (mode != SHOWJOBS_VERBOSE && ps != jp->ps) 37155714Skris goto skip; 37255714Skris if (jobno == curr && ps == jp->ps) 37355714Skris c = '+'; 37455714Skris else if (jobno == prev && ps == jp->ps) 37555714Skris c = '-'; 37655714Skris else 37755714Skris c = ' '; 37855714Skris if (ps == jp->ps) 37955714Skris fmtstr(s, 64, "[%d] %c ", jobno, c); 38055714Skris else 38155714Skris fmtstr(s, 64, " %c ", c); 38255714Skris out1str(s); 38355714Skris col = strlen(s); 38455714Skris if (mode == SHOWJOBS_VERBOSE) { 38555714Skris fmtstr(s, 64, "%d ", (int)ps->pid); 38655714Skris out1str(s); 38755714Skris col += strlen(s); 38855714Skris } 38955714Skris if (ps == jp->ps) { 39055714Skris out1str(statestr); 39155714Skris col += strlen(statestr); 39255714Skris } 39355714Skris do { 39455714Skris out1c(' '); 39555714Skris col++; 39655714Skris } while (col < 30); 39755714Skris if (mode == SHOWJOBS_VERBOSE) { 39855714Skris out1str(ps->cmd); 39955714Skris out1c('\n'); 40055714Skris } else 40155714Skris printjobcmd(jp); 40255714Skrisskip: if (--procno <= 0) 40355714Skris break; 40455714Skris } 40555714Skris} 40655714Skris 40755714Skris/* 40855714Skris * Print a list of jobs. If "change" is nonzero, only print jobs whose 40955714Skris * statuses have changed since the last call to showjobs. 41055714Skris * 41155714Skris * If the shell is interrupted in the process of creating a job, the 41255714Skris * result may be a job structure containing zero processes. Such structures 41355714Skris * will be freed here. 41455714Skris */ 41555714Skris 41655714Skrisvoid 41755714Skrisshowjobs(int change, int mode) 41855714Skris{ 41955714Skris int jobno; 42055714Skris struct job *jp; 42155714Skris 42255714Skris TRACE(("showjobs(%d) called\n", change)); 42355714Skris checkzombies(); 42455714Skris for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) { 42555714Skris if (! jp->used) 42655714Skris continue; 42755714Skris if (jp->nprocs == 0) { 42855714Skris freejob(jp); 42955714Skris continue; 43055714Skris } 43155714Skris if (change && ! jp->changed) 43255714Skris continue; 43355714Skris showjob(jp, mode); 43455714Skris jp->changed = 0; 43555714Skris /* Hack: discard jobs for which $! has not been referenced 43655714Skris * in interactive mode when they terminate. 43755714Skris */ 43855714Skris if (jp->state == JOBDONE && !jp->remembered && 43955714Skris (iflag || jp != bgjob)) { 44055714Skris freejob(jp); 44155714Skris } 44255714Skris } 44355714Skris} 44455714Skris 44555714Skris 44655714Skris/* 44755714Skris * Mark a job structure as unused. 44855714Skris */ 44955714Skris 45055714Skrisstatic void 45155714Skrisfreejob(struct job *jp) 45255714Skris{ 45355714Skris struct procstat *ps; 45455714Skris int i; 45555714Skris 45655714Skris INTOFF; 45755714Skris if (bgjob == jp) 45855714Skris bgjob = NULL; 45955714Skris for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) { 46055714Skris if (ps->cmd != nullstr) 46155714Skris ckfree(ps->cmd); 46255714Skris } 46355714Skris if (jp->ps != &jp->ps0) 46455714Skris ckfree(jp->ps); 46555714Skris jp->used = 0; 46655714Skris#if JOBS 46755714Skris deljob(jp); 46855714Skris#endif 46955714Skris INTON; 47055714Skris} 47155714Skris 47255714Skris 47355714Skris 47455714Skrisint 47555714Skriswaitcmd(int argc, char **argv) 47655714Skris{ 47755714Skris struct job *job; 47855714Skris int status, retval; 47955714Skris struct job *jp; 48055714Skris 48155714Skris if (argc > 1) { 48255714Skris job = getjob(argv[1]); 48355714Skris } else { 48455714Skris job = NULL; 48555714Skris } 48655714Skris 48755714Skris /* 48855714Skris * Loop until a process is terminated or stopped, or a SIGINT is 48955714Skris * received. 49055714Skris */ 49155714Skris 49255714Skris in_waitcmd++; 49355714Skris do { 49455714Skris if (job != NULL) { 49555714Skris if (job->state) { 49655714Skris status = job->ps[job->nprocs - 1].status; 49755714Skris if (WIFEXITED(status)) 49855714Skris retval = WEXITSTATUS(status); 49955714Skris#if JOBS 50055714Skris else if (WIFSTOPPED(status)) 50155714Skris retval = WSTOPSIG(status) + 128; 50255714Skris#endif 50355714Skris else 50455714Skris retval = WTERMSIG(status) + 128; 50555714Skris if (! iflag || ! job->changed) 50655714Skris freejob(job); 50755714Skris else { 50855714Skris job->remembered = 0; 50955714Skris if (job == bgjob) 51055714Skris bgjob = NULL; 51155714Skris } 51255714Skris in_waitcmd--; 51355714Skris return retval; 51455714Skris } 51555714Skris } else { 51655714Skris for (jp = jobtab ; jp < jobtab + njobs; jp++) 51755714Skris if (jp->used && jp->state == JOBDONE) { 51855714Skris if (! iflag || ! jp->changed) 51955714Skris freejob(jp); 52055714Skris else { 52155714Skris jp->remembered = 0; 52255714Skris if (jp == bgjob) 52355714Skris bgjob = NULL; 52455714Skris } 52555714Skris } 52655714Skris for (jp = jobtab ; ; jp++) { 52755714Skris if (jp >= jobtab + njobs) { /* no running procs */ 52855714Skris in_waitcmd--; 52955714Skris return 0; 53055714Skris } 53155714Skris if (jp->used && jp->state == 0) 53255714Skris break; 53355714Skris } 53455714Skris } 53555714Skris } while (dowait(1, (struct job *)NULL) != -1); 53655714Skris in_waitcmd--; 53755714Skris 53855714Skris return 0; 53955714Skris} 54055714Skris 54155714Skris 54255714Skris 54355714Skrisint 54455714Skrisjobidcmd(int argc __unused, char **argv) 54555714Skris{ 54655714Skris struct job *jp; 54755714Skris int i; 54855714Skris 54955714Skris jp = getjob(argv[1]); 55055714Skris for (i = 0 ; i < jp->nprocs ; ) { 55155714Skris out1fmt("%d", (int)jp->ps[i].pid); 55255714Skris out1c(++i < jp->nprocs? ' ' : '\n'); 55355714Skris } 55455714Skris return 0; 55555714Skris} 55655714Skris 55755714Skris 55855714Skris 55955714Skris/* 56055714Skris * Convert a job name to a job structure. 56155714Skris */ 56255714Skris 56355714Skrisstatic struct job * 56455714Skrisgetjob(char *name) 56555714Skris{ 56655714Skris int jobno; 56755714Skris struct job *found, *jp; 56855714Skris pid_t pid; 56955714Skris int i; 57055714Skris 57155714Skris if (name == NULL) { 57255714Skris#if JOBS 57355714Skriscurrentjob: if ((jp = getcurjob(NULL)) == NULL) 57455714Skris error("No current job"); 57555714Skris return (jp); 57655714Skris#else 57755714Skris error("No current job"); 57855714Skris#endif 57955714Skris } else if (name[0] == '%') { 58055714Skris if (is_digit(name[1])) { 58155714Skris jobno = number(name + 1); 58255714Skris if (jobno > 0 && jobno <= njobs 58355714Skris && jobtab[jobno - 1].used != 0) 58455714Skris return &jobtab[jobno - 1]; 58555714Skris#if JOBS 58655714Skris } else if (name[1] == '%' && name[2] == '\0') { 58755714Skris goto currentjob; 58855714Skris } else if (name[1] == '+' && name[2] == '\0') { 589 goto currentjob; 590 } else if (name[1] == '-' && name[2] == '\0') { 591 if ((jp = getcurjob(NULL)) == NULL || 592 (jp = getcurjob(jp)) == NULL) 593 error("No previous job"); 594 return (jp); 595#endif 596 } else if (name[1] == '?') { 597 found = NULL; 598 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 599 if (jp->used && jp->nprocs > 0 600 && strstr(jp->ps[0].cmd, name + 2) != NULL) { 601 if (found) 602 error("%s: ambiguous", name); 603 found = jp; 604 } 605 } 606 if (found != NULL) 607 return (found); 608 } else { 609 found = NULL; 610 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 611 if (jp->used && jp->nprocs > 0 612 && prefix(name + 1, jp->ps[0].cmd)) { 613 if (found) 614 error("%s: ambiguous", name); 615 found = jp; 616 } 617 } 618 if (found) 619 return found; 620 } 621 } else if (is_number(name)) { 622 pid = (pid_t)number(name); 623 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) { 624 if (jp->used && jp->nprocs > 0 625 && jp->ps[jp->nprocs - 1].pid == pid) 626 return jp; 627 } 628 } 629 error("No such job: %s", name); 630 /*NOTREACHED*/ 631 return NULL; 632} 633 634 635pid_t 636getjobpgrp(char *name) 637{ 638 struct job *jp; 639 640 jp = getjob(name); 641 return -jp->ps[0].pid; 642} 643 644/* 645 * Return a new job structure, 646 */ 647 648struct job * 649makejob(union node *node __unused, int nprocs) 650{ 651 int i; 652 struct job *jp; 653 654 for (i = njobs, jp = jobtab ; ; jp++) { 655 if (--i < 0) { 656 INTOFF; 657 if (njobs == 0) { 658 jobtab = ckmalloc(4 * sizeof jobtab[0]); 659#if JOBS 660 jobmru = NULL; 661#endif 662 } else { 663 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]); 664 memcpy(jp, jobtab, njobs * sizeof jp[0]); 665#if JOBS 666 /* Relocate `next' pointers and list head */ 667 if (jobmru != NULL) 668 jobmru = &jp[jobmru - jobtab]; 669 for (i = 0; i < njobs; i++) 670 if (jp[i].next != NULL) 671 jp[i].next = &jp[jp[i].next - 672 jobtab]; 673#endif 674 if (bgjob != NULL) 675 bgjob = &jp[bgjob - jobtab]; 676 /* Relocate `ps' pointers */ 677 for (i = 0; i < njobs; i++) 678 if (jp[i].ps == &jobtab[i].ps0) 679 jp[i].ps = &jp[i].ps0; 680 ckfree(jobtab); 681 jobtab = jp; 682 } 683 jp = jobtab + njobs; 684 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0); 685 INTON; 686 break; 687 } 688 if (jp->used == 0) 689 break; 690 } 691 INTOFF; 692 jp->state = 0; 693 jp->used = 1; 694 jp->changed = 0; 695 jp->nprocs = 0; 696 jp->foreground = 0; 697 jp->remembered = 0; 698#if JOBS 699 jp->jobctl = jobctl; 700 jp->next = NULL; 701#endif 702 if (nprocs > 1) { 703 jp->ps = ckmalloc(nprocs * sizeof (struct procstat)); 704 } else { 705 jp->ps = &jp->ps0; 706 } 707 INTON; 708 TRACE(("makejob(%p, %d) returns %%%td\n", (void *)node, nprocs, 709 jp - jobtab + 1)); 710 return jp; 711} 712 713#if JOBS 714static void 715setcurjob(struct job *cj) 716{ 717 struct job *jp, *prev; 718 719 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 720 if (jp == cj) { 721 if (prev != NULL) 722 prev->next = jp->next; 723 else 724 jobmru = jp->next; 725 jp->next = jobmru; 726 jobmru = cj; 727 return; 728 } 729 } 730 cj->next = jobmru; 731 jobmru = cj; 732} 733 734static void 735deljob(struct job *j) 736{ 737 struct job *jp, *prev; 738 739 for (prev = NULL, jp = jobmru; jp != NULL; prev = jp, jp = jp->next) { 740 if (jp == j) { 741 if (prev != NULL) 742 prev->next = jp->next; 743 else 744 jobmru = jp->next; 745 return; 746 } 747 } 748} 749 750/* 751 * Return the most recently used job that isn't `nj', and preferably one 752 * that is stopped. 753 */ 754static struct job * 755getcurjob(struct job *nj) 756{ 757 struct job *jp; 758 759 /* Try to find a stopped one.. */ 760 for (jp = jobmru; jp != NULL; jp = jp->next) 761 if (jp->used && jp != nj && jp->state == JOBSTOPPED) 762 return (jp); 763 /* Otherwise the most recently used job that isn't `nj' */ 764 for (jp = jobmru; jp != NULL; jp = jp->next) 765 if (jp->used && jp != nj) 766 return (jp); 767 768 return (NULL); 769} 770 771#endif 772 773/* 774 * Fork of a subshell. If we are doing job control, give the subshell its 775 * own process group. Jp is a job structure that the job is to be added to. 776 * N is the command that will be evaluated by the child. Both jp and n may 777 * be NULL. The mode parameter can be one of the following: 778 * FORK_FG - Fork off a foreground process. 779 * FORK_BG - Fork off a background process. 780 * FORK_NOJOB - Like FORK_FG, but don't give the process its own 781 * process group even if job control is on. 782 * 783 * When job control is turned off, background processes have their standard 784 * input redirected to /dev/null (except for the second and later processes 785 * in a pipeline). 786 */ 787 788pid_t 789forkshell(struct job *jp, union node *n, int mode) 790{ 791 pid_t pid; 792 pid_t pgrp; 793 794 TRACE(("forkshell(%%%td, %p, %d) called\n", jp - jobtab, (void *)n, 795 mode)); 796 INTOFF; 797 if (mode == FORK_BG && (jp == NULL || jp->nprocs == 0)) 798 checkzombies(); 799 flushall(); 800 pid = fork(); 801 if (pid == -1) { 802 TRACE(("Fork failed, errno=%d\n", errno)); 803 INTON; 804 error("Cannot fork: %s", strerror(errno)); 805 } 806 if (pid == 0) { 807 struct job *p; 808 int wasroot; 809 int i; 810 811 TRACE(("Child shell %d\n", (int)getpid())); 812 wasroot = rootshell; 813 rootshell = 0; 814 handler = &main_handler; 815 closescript(); 816 INTON; 817 clear_traps(); 818#if JOBS 819 jobctl = 0; /* do job control only in root shell */ 820 if (wasroot && mode != FORK_NOJOB && mflag) { 821 if (jp == NULL || jp->nprocs == 0) 822 pgrp = getpid(); 823 else 824 pgrp = jp->ps[0].pid; 825 if (setpgid(0, pgrp) == 0 && mode == FORK_FG) { 826 /*** this causes superfluous TIOCSPGRPS ***/ 827 if (tcsetpgrp(ttyfd, pgrp) < 0) 828 error("tcsetpgrp failed, errno=%d", errno); 829 } 830 setsignal(SIGTSTP); 831 setsignal(SIGTTOU); 832 } else if (mode == FORK_BG) { 833 ignoresig(SIGINT); 834 ignoresig(SIGQUIT); 835 if ((jp == NULL || jp->nprocs == 0) && 836 ! fd0_redirected_p ()) { 837 close(0); 838 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 839 error("Can't open %s: %s", 840 _PATH_DEVNULL, strerror(errno)); 841 } 842 } 843#else 844 if (mode == FORK_BG) { 845 ignoresig(SIGINT); 846 ignoresig(SIGQUIT); 847 if ((jp == NULL || jp->nprocs == 0) && 848 ! fd0_redirected_p ()) { 849 close(0); 850 if (open(_PATH_DEVNULL, O_RDONLY) != 0) 851 error("Can't open %s: %s", 852 _PATH_DEVNULL, strerror(errno)); 853 } 854 } 855#endif 856 INTOFF; 857 for (i = njobs, p = jobtab ; --i >= 0 ; p++) 858 if (p->used) 859 freejob(p); 860 INTON; 861 if (wasroot && iflag) { 862 setsignal(SIGINT); 863 setsignal(SIGQUIT); 864 setsignal(SIGTERM); 865 } 866 return pid; 867 } 868 if (rootshell && mode != FORK_NOJOB && mflag) { 869 if (jp == NULL || jp->nprocs == 0) 870 pgrp = pid; 871 else 872 pgrp = jp->ps[0].pid; 873 setpgid(pid, pgrp); 874 } 875 if (mode == FORK_BG) { 876 if (bgjob != NULL && bgjob->state == JOBDONE && 877 !bgjob->remembered && !iflag) 878 freejob(bgjob); 879 backgndpid = pid; /* set $! */ 880 bgjob = jp; 881 } 882 if (jp) { 883 struct procstat *ps = &jp->ps[jp->nprocs++]; 884 ps->pid = pid; 885 ps->status = -1; 886 ps->cmd = nullstr; 887 if (iflag && rootshell && n) 888 ps->cmd = commandtext(n); 889 jp->foreground = mode == FORK_FG; 890#if JOBS 891 setcurjob(jp); 892#endif 893 } 894 INTON; 895 TRACE(("In parent shell: child = %d\n", (int)pid)); 896 return pid; 897} 898 899 900 901/* 902 * Wait for job to finish. 903 * 904 * Under job control we have the problem that while a child process is 905 * running interrupts generated by the user are sent to the child but not 906 * to the shell. This means that an infinite loop started by an inter- 907 * active user may be hard to kill. With job control turned off, an 908 * interactive user may place an interactive program inside a loop. If 909 * the interactive program catches interrupts, the user doesn't want 910 * these interrupts to also abort the loop. The approach we take here 911 * is to have the shell ignore interrupt signals while waiting for a 912 * foreground process to terminate, and then send itself an interrupt 913 * signal if the child process was terminated by an interrupt signal. 914 * Unfortunately, some programs want to do a bit of cleanup and then 915 * exit on interrupt; unless these processes terminate themselves by 916 * sending a signal to themselves (instead of calling exit) they will 917 * confuse this approach. 918 */ 919 920int 921waitforjob(struct job *jp, int *origstatus) 922{ 923#if JOBS 924 pid_t mypgrp = getpgrp(); 925 int propagate_int = jp->jobctl && jp->foreground; 926#endif 927 int status; 928 int st; 929 930 INTOFF; 931 TRACE(("waitforjob(%%%td) called\n", jp - jobtab + 1)); 932 while (jp->state == 0) 933 if (dowait(1, jp) == -1) 934 dotrap(); 935#if JOBS 936 if (jp->jobctl) { 937 if (tcsetpgrp(ttyfd, mypgrp) < 0) 938 error("tcsetpgrp failed, errno=%d\n", errno); 939 } 940 if (jp->state == JOBSTOPPED) 941 setcurjob(jp); 942#endif 943 status = jp->ps[jp->nprocs - 1].status; 944 if (origstatus != NULL) 945 *origstatus = status; 946 /* convert to 8 bits */ 947 if (WIFEXITED(status)) 948 st = WEXITSTATUS(status); 949#if JOBS 950 else if (WIFSTOPPED(status)) 951 st = WSTOPSIG(status) + 128; 952#endif 953 else 954 st = WTERMSIG(status) + 128; 955 if (! JOBS || jp->state == JOBDONE) 956 freejob(jp); 957 if (int_pending()) { 958 if (!WIFSIGNALED(status) || WTERMSIG(status) != SIGINT) 959 CLEAR_PENDING_INT; 960 } 961#if JOBS 962 else if (rootshell && iflag && propagate_int && 963 WIFSIGNALED(status) && WTERMSIG(status) == SIGINT) 964 kill(getpid(), SIGINT); 965#endif 966 INTON; 967 return st; 968} 969 970 971 972/* 973 * Wait for a process to terminate. 974 */ 975 976static pid_t 977dowait(int block, struct job *job) 978{ 979 pid_t pid; 980 int status; 981 struct procstat *sp; 982 struct job *jp; 983 struct job *thisjob; 984 int done; 985 int stopped; 986 int sig; 987 int coredump; 988 989 in_dowait++; 990 TRACE(("dowait(%d) called\n", block)); 991 do { 992 pid = waitproc(block, &status); 993 TRACE(("wait returns %d, status=%d\n", (int)pid, status)); 994 } while ((pid == -1 && errno == EINTR && breakwaitcmd == 0) || 995 (pid > 0 && WIFSTOPPED(status) && !iflag)); 996 in_dowait--; 997 if (pid == -1 && errno == ECHILD && job != NULL) 998 job->state = JOBDONE; 999 if (breakwaitcmd != 0) { 1000 breakwaitcmd = 0; 1001 if (pid <= 0) 1002 return -1; 1003 } 1004 if (pid <= 0) 1005 return pid; 1006 INTOFF; 1007 thisjob = NULL; 1008 for (jp = jobtab ; jp < jobtab + njobs ; jp++) { 1009 if (jp->used && jp->nprocs > 0) { 1010 done = 1; 1011 stopped = 1; 1012 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) { 1013 if (sp->pid == -1) 1014 continue; 1015 if (sp->pid == pid) { 1016 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", 1017 (int)pid, sp->status, 1018 status)); 1019 sp->status = status; 1020 thisjob = jp; 1021 } 1022 if (sp->status == -1) 1023 stopped = 0; 1024 else if (WIFSTOPPED(sp->status)) 1025 done = 0; 1026 } 1027 if (stopped) { /* stopped or done */ 1028 int state = done? JOBDONE : JOBSTOPPED; 1029 if (jp->state != state) { 1030 TRACE(("Job %td: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state)); 1031 jp->state = state; 1032 if (jp != job) { 1033 if (done && !jp->remembered && 1034 !iflag && jp != bgjob) 1035 freejob(jp); 1036#if JOBS 1037 else if (done) 1038 deljob(jp); 1039#endif 1040 } 1041 } 1042 } 1043 } 1044 } 1045 INTON; 1046 if (!thisjob || thisjob->state == 0) 1047 ; 1048 else if ((!rootshell || !iflag || thisjob == job) && 1049 thisjob->foreground && thisjob->state != JOBSTOPPED) { 1050 sig = 0; 1051 coredump = 0; 1052 for (sp = thisjob->ps; sp < thisjob->ps + thisjob->nprocs; sp++) 1053 if (WIFSIGNALED(sp->status)) { 1054 sig = WTERMSIG(sp->status); 1055 coredump = WCOREDUMP(sp->status); 1056 } 1057 if (sig > 0 && sig != SIGINT && sig != SIGPIPE) { 1058 if (sig < sys_nsig && sys_siglist[sig]) 1059 out1str(sys_siglist[sig]); 1060 else 1061 out1fmt("Signal %d", sig); 1062 if (coredump) 1063 out1str(" (core dumped)"); 1064 out1c('\n'); 1065 } 1066 } else { 1067 TRACE(("Not printing status, rootshell=%d, job=%p\n", rootshell, job)); 1068 thisjob->changed = 1; 1069 } 1070 return pid; 1071} 1072 1073 1074 1075/* 1076 * Do a wait system call. If job control is compiled in, we accept 1077 * stopped processes. If block is zero, we return a value of zero 1078 * rather than blocking. 1079 */ 1080static pid_t 1081waitproc(int block, int *status) 1082{ 1083 int flags; 1084 1085#if JOBS 1086 flags = WUNTRACED; 1087#else 1088 flags = 0; 1089#endif 1090 if (block == 0) 1091 flags |= WNOHANG; 1092 return wait3(status, flags, (struct rusage *)NULL); 1093} 1094 1095/* 1096 * return 1 if there are stopped jobs, otherwise 0 1097 */ 1098int job_warning = 0; 1099int 1100stoppedjobs(void) 1101{ 1102 int jobno; 1103 struct job *jp; 1104 1105 if (job_warning) 1106 return (0); 1107 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) { 1108 if (jp->used == 0) 1109 continue; 1110 if (jp->state == JOBSTOPPED) { 1111 out2fmt_flush("You have stopped jobs.\n"); 1112 job_warning = 2; 1113 return (1); 1114 } 1115 } 1116 1117 return (0); 1118} 1119 1120 1121static void 1122checkzombies(void) 1123{ 1124 while (njobs > 0 && dowait(0, NULL) > 0) 1125 ; 1126} 1127 1128 1129int 1130backgndpidset(void) 1131{ 1132 return backgndpid != -1; 1133} 1134 1135 1136pid_t 1137backgndpidval(void) 1138{ 1139 if (bgjob != NULL) 1140 bgjob->remembered = 1; 1141 return backgndpid; 1142} 1143 1144/* 1145 * Return a string identifying a command (to be printed by the 1146 * jobs command. 1147 */ 1148 1149static char *cmdnextc; 1150static int cmdnleft; 1151#define MAXCMDTEXT 200 1152 1153char * 1154commandtext(union node *n) 1155{ 1156 char *name; 1157 1158 cmdnextc = name = ckmalloc(MAXCMDTEXT); 1159 cmdnleft = MAXCMDTEXT - 4; 1160 cmdtxt(n); 1161 *cmdnextc = '\0'; 1162 return name; 1163} 1164 1165 1166static void 1167cmdtxt(union node *n) 1168{ 1169 union node *np; 1170 struct nodelist *lp; 1171 const char *p; 1172 int i; 1173 char s[2]; 1174 1175 if (n == NULL) 1176 return; 1177 switch (n->type) { 1178 case NSEMI: 1179 cmdtxt(n->nbinary.ch1); 1180 cmdputs("; "); 1181 cmdtxt(n->nbinary.ch2); 1182 break; 1183 case NAND: 1184 cmdtxt(n->nbinary.ch1); 1185 cmdputs(" && "); 1186 cmdtxt(n->nbinary.ch2); 1187 break; 1188 case NOR: 1189 cmdtxt(n->nbinary.ch1); 1190 cmdputs(" || "); 1191 cmdtxt(n->nbinary.ch2); 1192 break; 1193 case NPIPE: 1194 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) { 1195 cmdtxt(lp->n); 1196 if (lp->next) 1197 cmdputs(" | "); 1198 } 1199 break; 1200 case NSUBSHELL: 1201 cmdputs("("); 1202 cmdtxt(n->nredir.n); 1203 cmdputs(")"); 1204 break; 1205 case NREDIR: 1206 case NBACKGND: 1207 cmdtxt(n->nredir.n); 1208 break; 1209 case NIF: 1210 cmdputs("if "); 1211 cmdtxt(n->nif.test); 1212 cmdputs("; then "); 1213 cmdtxt(n->nif.ifpart); 1214 cmdputs("..."); 1215 break; 1216 case NWHILE: 1217 cmdputs("while "); 1218 goto until; 1219 case NUNTIL: 1220 cmdputs("until "); 1221until: 1222 cmdtxt(n->nbinary.ch1); 1223 cmdputs("; do "); 1224 cmdtxt(n->nbinary.ch2); 1225 cmdputs("; done"); 1226 break; 1227 case NFOR: 1228 cmdputs("for "); 1229 cmdputs(n->nfor.var); 1230 cmdputs(" in ..."); 1231 break; 1232 case NCASE: 1233 cmdputs("case "); 1234 cmdputs(n->ncase.expr->narg.text); 1235 cmdputs(" in ..."); 1236 break; 1237 case NDEFUN: 1238 cmdputs(n->narg.text); 1239 cmdputs("() ..."); 1240 break; 1241 case NCMD: 1242 for (np = n->ncmd.args ; np ; np = np->narg.next) { 1243 cmdtxt(np); 1244 if (np->narg.next) 1245 cmdputs(" "); 1246 } 1247 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) { 1248 cmdputs(" "); 1249 cmdtxt(np); 1250 } 1251 break; 1252 case NARG: 1253 cmdputs(n->narg.text); 1254 break; 1255 case NTO: 1256 p = ">"; i = 1; goto redir; 1257 case NAPPEND: 1258 p = ">>"; i = 1; goto redir; 1259 case NTOFD: 1260 p = ">&"; i = 1; goto redir; 1261 case NCLOBBER: 1262 p = ">|"; i = 1; goto redir; 1263 case NFROM: 1264 p = "<"; i = 0; goto redir; 1265 case NFROMTO: 1266 p = "<>"; i = 0; goto redir; 1267 case NFROMFD: 1268 p = "<&"; i = 0; goto redir; 1269redir: 1270 if (n->nfile.fd != i) { 1271 s[0] = n->nfile.fd + '0'; 1272 s[1] = '\0'; 1273 cmdputs(s); 1274 } 1275 cmdputs(p); 1276 if (n->type == NTOFD || n->type == NFROMFD) { 1277 if (n->ndup.dupfd >= 0) 1278 s[0] = n->ndup.dupfd + '0'; 1279 else 1280 s[0] = '-'; 1281 s[1] = '\0'; 1282 cmdputs(s); 1283 } else { 1284 cmdtxt(n->nfile.fname); 1285 } 1286 break; 1287 case NHERE: 1288 case NXHERE: 1289 cmdputs("<<..."); 1290 break; 1291 default: 1292 cmdputs("???"); 1293 break; 1294 } 1295} 1296 1297 1298 1299static void 1300cmdputs(const char *s) 1301{ 1302 const char *p; 1303 char *q; 1304 char c; 1305 int subtype = 0; 1306 1307 if (cmdnleft <= 0) 1308 return; 1309 p = s; 1310 q = cmdnextc; 1311 while ((c = *p++) != '\0') { 1312 if (c == CTLESC) 1313 *q++ = *p++; 1314 else if (c == CTLVAR) { 1315 *q++ = '$'; 1316 if (--cmdnleft > 0) 1317 *q++ = '{'; 1318 subtype = *p++; 1319 if ((subtype & VSTYPE) == VSLENGTH && --cmdnleft > 0) 1320 *q++ = '#'; 1321 } else if (c == '=' && subtype != 0) { 1322 *q = "}-+?=##%%\0X"[(subtype & VSTYPE) - VSNORMAL]; 1323 if (*q) 1324 q++; 1325 else 1326 cmdnleft++; 1327 if (((subtype & VSTYPE) == VSTRIMLEFTMAX || 1328 (subtype & VSTYPE) == VSTRIMRIGHTMAX) && 1329 --cmdnleft > 0) 1330 *q = q[-1], q++; 1331 subtype = 0; 1332 } else if (c == CTLENDVAR) { 1333 *q++ = '}'; 1334 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE) { 1335 cmdnleft -= 5; 1336 if (cmdnleft > 0) { 1337 *q++ = '$'; 1338 *q++ = '('; 1339 *q++ = '.'; 1340 *q++ = '.'; 1341 *q++ = '.'; 1342 *q++ = ')'; 1343 } 1344 } else if (c == CTLARI) { 1345 cmdnleft -= 2; 1346 if (cmdnleft > 0) { 1347 *q++ = '$'; 1348 *q++ = '('; 1349 *q++ = '('; 1350 } 1351 p++; 1352 } else if (c == CTLENDARI) { 1353 if (--cmdnleft > 0) { 1354 *q++ = ')'; 1355 *q++ = ')'; 1356 } 1357 } else if (c == CTLQUOTEMARK || c == CTLQUOTEEND) 1358 cmdnleft++; /* ignore */ 1359 else 1360 *q++ = c; 1361 if (--cmdnleft <= 0) { 1362 *q++ = '.'; 1363 *q++ = '.'; 1364 *q++ = '.'; 1365 break; 1366 } 1367 } 1368 cmdnextc = q; 1369} 1370