| [9] | 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | */
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| 36 |
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| 37 | #ifndef lint
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| 38 | static char sccsid[] = "@(#)jobs.c 5.1 (Berkeley) 3/7/91";
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| 39 | #endif /* not lint */
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| 40 |
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| 41 | #include "shell.h"
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| 42 | #if JOBS
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| 43 | #include "sgtty.h"
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| 44 | #undef CEOF /* syntax.h redefines this */
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| 45 | #endif
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| 46 | #include "main.h"
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| 47 | #include "parser.h"
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| 48 | #include "nodes.h"
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| 49 | #include "jobs.h"
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| 50 | #include "options.h"
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| 51 | #include "trap.h"
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| 52 | #include "signames.h"
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| 53 | #include "syntax.h"
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| 54 | #include "input.h"
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| 55 | #include "output.h"
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| 56 | #include "memalloc.h"
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| 57 | #include "error.h"
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| 58 | #include "mystring.h"
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| 59 | #include "redir.h"
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| 60 | #include <sys/types.h>
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| 61 | #include <fcntl.h>
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| 62 | #include <signal.h>
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| 63 | #include <errno.h>
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| 64 | #ifdef BSD
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| 65 | #include <sys/types.h>
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| 66 | #include <sys/wait.h>
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| 67 | #include <sys/time.h>
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| 68 | #include <sys/resource.h>
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| 69 | #endif
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| 70 | #if POSIX
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| 71 | #include <sys/wait.h>
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| 72 | #endif
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| 73 |
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| 74 |
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| 75 |
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| 76 | struct job *jobtab; /* array of jobs */
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| 77 | int njobs; /* size of array */
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| 78 | MKINIT pid_t backgndpid = -1; /* pid of last background process */
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| 79 | #if JOBS
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| 80 | int initialpgrp; /* pgrp of shell on invocation */
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| 81 | pid_t curjob; /* current job */
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| 82 | #endif
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| 83 |
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| 84 | #ifdef __STDC__
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| 85 | STATIC void restartjob(struct job *);
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| 86 | STATIC struct job *getjob(char *);
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| 87 | STATIC void freejob(struct job *);
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| 88 | STATIC int procrunning(int);
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| 89 | STATIC int dowait(int, struct job *);
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| 90 | STATIC int waitproc(int, int *);
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| 91 | STATIC char *commandtext(union node *);
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| 92 | #else
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| 93 | STATIC void restartjob();
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| 94 | STATIC struct job *getjob();
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| 95 | STATIC void freejob();
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| 96 | STATIC int procrunning();
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| 97 | STATIC int dowait();
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| 98 | STATIC int waitproc();
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| 99 | STATIC char *commandtext();
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| 100 | #endif
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| 101 |
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| 102 |
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| 103 |
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| 104 | #if JOBS
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| 105 | /*
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| 106 | * Turn job control on and off.
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| 107 | *
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| 108 | * Note: This code assumes that the third arg to ioctl is a character
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| 109 | * pointer, which is true on Berkeley systems but not System V. Since
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| 110 | * System V doesn't have job control yet, this isn't a problem now.
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| 111 | */
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| 112 |
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| 113 | MKINIT int jobctl;
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| 114 |
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| 115 | void
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| 116 | setjobctl(on) {
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| 117 | int ldisc;
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| 118 |
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| 119 | if (on == jobctl || rootshell == 0)
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| 120 | return;
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| 121 | if (on) {
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| 122 | do { /* while we are in the background */
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| 123 | if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) {
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| 124 | out2str("ash: can't access tty; job control turned off\n");
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| 125 | jflag = 0;
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| 126 | return;
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| 127 | }
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| 128 | if (initialpgrp == -1)
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| 129 | initialpgrp = getpgrp(0);
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| 130 | else if (initialpgrp != getpgrp(0)) {
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| 131 | killpg(initialpgrp, SIGTTIN);
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| 132 | continue;
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| 133 | }
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| 134 | } while (0);
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| 135 | if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) {
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| 136 | out2str("ash: need new tty driver to run job control; job control turned off\n");
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| 137 | jflag = 0;
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| 138 | return;
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| 139 | }
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| 140 | setsignal(SIGTSTP);
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| 141 | setsignal(SIGTTOU);
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| 142 | setpgrp(0, rootpid);
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| 143 | ioctl(2, TIOCSPGRP, (char *)&rootpid);
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| 144 | } else { /* turning job control off */
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| 145 | setpgrp(0, initialpgrp);
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| 146 | ioctl(2, TIOCSPGRP, (char *)&initialpgrp);
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| 147 | setsignal(SIGTSTP);
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| 148 | setsignal(SIGTTOU);
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| 149 | }
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| 150 | jobctl = on;
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| 151 | }
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| 152 | #endif
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| 153 |
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| 154 |
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| 155 | #ifdef mkinit
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| 156 |
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| 157 | SHELLPROC {
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| 158 | backgndpid = -1;
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| 159 | #if JOBS
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| 160 | jobctl = 0;
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| 161 | #endif
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| 162 | }
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| 163 |
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| 164 | #endif
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| 165 |
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| 166 |
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| 167 |
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| 168 | #if JOBS
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| 169 | fgcmd(argc, argv) char **argv; {
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| 170 | struct job *jp;
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| 171 | int pgrp;
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| 172 | int status;
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| 173 |
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| 174 | jp = getjob(argv[1]);
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| 175 | if (jp->jobctl == 0)
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| 176 | error("job not created under job control");
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| 177 | pgrp = jp->ps[0].pid;
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| 178 | ioctl(2, TIOCSPGRP, (char *)&pgrp);
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| 179 | restartjob(jp);
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| 180 | INTOFF;
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| 181 | status = waitforjob(jp);
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| 182 | INTON;
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| 183 | return status;
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| 184 | }
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| 185 |
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| 186 |
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| 187 | bgcmd(argc, argv) char **argv; {
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| 188 | struct job *jp;
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| 189 |
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| 190 | do {
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| 191 | jp = getjob(*++argv);
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| 192 | if (jp->jobctl == 0)
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| 193 | error("job not created under job control");
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| 194 | restartjob(jp);
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| 195 | } while (--argc > 1);
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| 196 | return 0;
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| 197 | }
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| 198 |
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| 199 |
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| 200 | STATIC void
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| 201 | restartjob(jp)
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| 202 | struct job *jp;
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| 203 | {
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| 204 | struct procstat *ps;
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| 205 | int i;
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| 206 |
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| 207 | if (jp->state == JOBDONE)
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| 208 | return;
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| 209 | INTOFF;
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| 210 | killpg(jp->ps[0].pid, SIGCONT);
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| 211 | for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
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| 212 | if ((ps->status & 0377) == 0177) {
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| 213 | ps->status = -1;
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| 214 | jp->state = 0;
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| 215 | }
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| 216 | }
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| 217 | INTON;
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| 218 | }
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| 219 | #endif
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| 220 |
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| 221 |
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| 222 | int
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| 223 | jobscmd(argc, argv) char **argv; {
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| 224 | showjobs(0);
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| 225 | return 0;
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| 226 | }
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| 227 |
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| 228 |
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| 229 | /*
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| 230 | * Print a list of jobs. If "change" is nonzero, only print jobs whose
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| 231 | * statuses have changed since the last call to showjobs.
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| 232 | *
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| 233 | * If the shell is interrupted in the process of creating a job, the
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| 234 | * result may be a job structure containing zero processes. Such structures
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| 235 | * will be freed here.
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| 236 | */
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| 237 |
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| 238 | void
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| 239 | showjobs(change) {
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| 240 | int jobno;
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| 241 | int procno;
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| 242 | int i;
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| 243 | struct job *jp;
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| 244 | struct procstat *ps;
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| 245 | int col;
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| 246 | char s[64];
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| 247 |
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| 248 | TRACE(("showjobs(%d) called\n", change));
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| 249 | while (dowait(0, (struct job *)NULL) > 0);
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| 250 | for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
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| 251 | if (! jp->used)
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| 252 | continue;
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| 253 | if (jp->nprocs == 0) {
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| 254 | freejob(jp);
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| 255 | continue;
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| 256 | }
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| 257 | if (change && ! jp->changed)
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| 258 | continue;
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| 259 | procno = jp->nprocs;
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| 260 | for (ps = jp->ps ; ; ps++) { /* for each process */
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| 261 | if (ps == jp->ps)
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| 262 | fmtstr(s, 64, "[%d] %d ", jobno, ps->pid);
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| 263 | else
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| 264 | fmtstr(s, 64, " %d ", ps->pid);
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| 265 | out1str(s);
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| 266 | col = strlen(s);
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| 267 | s[0] = '\0';
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| 268 | if (ps->status == -1) {
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| 269 | /* don't print anything */
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| 270 | } else if ((ps->status & 0xFF) == 0) {
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| 271 | fmtstr(s, 64, "Exit %d", ps->status >> 8);
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| 272 | } else {
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| 273 | i = ps->status;
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| 274 | #if JOBS
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| 275 | if ((i & 0xFF) == 0177)
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| 276 | i >>= 8;
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| 277 | #endif
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| 278 | if ((i & 0x7F) <= MAXSIG && sigmesg[i & 0x7F])
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| 279 | scopy(sigmesg[i & 0x7F], s);
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| 280 | else
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| 281 | fmtstr(s, 64, "Signal %d", i & 0x7F);
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| 282 | if (i & 0x80)
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| 283 | strcat(s, " (core dumped)");
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| 284 | }
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| 285 | out1str(s);
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| 286 | col += strlen(s);
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| 287 | do {
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| 288 | out1c(' ');
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| 289 | col++;
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| 290 | } while (col < 30);
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| 291 | out1str(ps->cmd);
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| 292 | out1c('\n');
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| 293 | if (--procno <= 0)
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| 294 | break;
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| 295 | }
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| 296 | jp->changed = 0;
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| 297 | if (jp->state == JOBDONE) {
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| 298 | freejob(jp);
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| 299 | }
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| 300 | }
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| 301 | }
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| 302 |
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| 303 |
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| 304 | /*
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| 305 | * Mark a job structure as unused.
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| 306 | */
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| 307 |
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| 308 | STATIC void
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| 309 | freejob(jp)
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| 310 | struct job *jp;
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| 311 | {
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| 312 | struct procstat *ps;
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| 313 | int i;
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| 314 |
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| 315 | INTOFF;
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| 316 | for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
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| 317 | if (ps->cmd != nullstr)
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| 318 | ckfree(ps->cmd);
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| 319 | }
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| 320 | if (jp->ps != &jp->ps0)
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| 321 | ckfree(jp->ps);
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| 322 | jp->used = 0;
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| 323 | #if JOBS
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| 324 | if (curjob == jp - jobtab + 1)
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| 325 | curjob = 0;
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| 326 | #endif
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| 327 | INTON;
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| 328 | }
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| 329 |
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| 330 |
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| 331 |
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| 332 | int
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| 333 | waitcmd(argc, argv) char **argv; {
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| 334 | struct job *job;
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| 335 | int status;
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| 336 | struct job *jp;
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| 337 |
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| 338 | if (argc > 1) {
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| 339 | job = getjob(argv[1]);
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| 340 | } else {
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| 341 | job = NULL;
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| 342 | }
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| 343 | for (;;) { /* loop until process terminated or stopped */
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| 344 | if (job != NULL) {
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| 345 | if (job->state) {
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| 346 | status = job->ps[job->nprocs - 1].status;
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| 347 | if ((status & 0xFF) == 0)
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| 348 | status = status >> 8 & 0xFF;
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| 349 | #if JOBS
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| 350 | else if ((status & 0xFF) == 0177)
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| 351 | status = (status >> 8 & 0x7F) + 128;
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| 352 | #endif
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| 353 | else
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| 354 | status = (status & 0x7F) + 128;
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| 355 | if (! iflag)
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| 356 | freejob(job);
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| 357 | return status;
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| 358 | }
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| 359 | } else {
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| 360 | for (jp = jobtab ; ; jp++) {
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| 361 | if (jp >= jobtab + njobs) { /* no running procs */
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| 362 | return 0;
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| 363 | }
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| 364 | if (jp->used && jp->state == 0)
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| 365 | break;
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| 366 | }
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| 367 | }
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| 368 | dowait(1, (struct job *)NULL);
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| 369 | }
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| 370 | }
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| 371 |
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| 372 |
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| 373 |
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| 374 | jobidcmd(argc, argv) char **argv; {
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| 375 | struct job *jp;
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| 376 | int i;
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| 377 |
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| 378 | jp = getjob(argv[1]);
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| 379 | for (i = 0 ; i < jp->nprocs ; ) {
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| 380 | out1fmt("%d", jp->ps[i].pid);
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| 381 | out1c(++i < jp->nprocs? ' ' : '\n');
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| 382 | }
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| 383 | return 0;
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| 384 | }
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| 385 |
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| 386 |
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| 387 |
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| 388 | /*
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| 389 | * Convert a job name to a job structure.
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| 390 | */
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| 391 |
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| 392 | STATIC struct job *
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| 393 | getjob(name)
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| 394 | char *name;
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| 395 | {
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| 396 | int jobno;
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| 397 | register struct job *jp;
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| 398 | int pid;
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| 399 | int i;
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| 400 |
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| 401 | if (name == NULL) {
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| 402 | #if JOBS
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| 403 | currentjob:
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| 404 | if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
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| 405 | error("No current job");
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| 406 | return &jobtab[jobno - 1];
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| 407 | #else
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| 408 | error("No current job");
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| 409 | #endif
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| 410 | } else if (name[0] == '%') {
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| 411 | if (is_digit(name[1])) {
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| 412 | jobno = number(name + 1);
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| 413 | if (jobno > 0 && jobno <= njobs
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| 414 | && jobtab[jobno - 1].used != 0)
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| 415 | return &jobtab[jobno - 1];
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| 416 | #if JOBS
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| 417 | } else if (name[1] == '%' && name[2] == '\0') {
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| 418 | goto currentjob;
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| 419 | #endif
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| 420 | } else {
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| 421 | register struct job *found = NULL;
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| 422 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
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| 423 | if (jp->used && jp->nprocs > 0
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| 424 | && prefix(name + 1, jp->ps[0].cmd)) {
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| 425 | if (found)
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| 426 | error("%s: ambiguous", name);
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| 427 | found = jp;
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| 428 | }
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| 429 | }
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| 430 | if (found)
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| 431 | return found;
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| 432 | }
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| 433 | } else if (is_number(name)) {
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| 434 | pid = number(name);
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| 435 | for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
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| 436 | if (jp->used && jp->nprocs > 0
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| 437 | && jp->ps[jp->nprocs - 1].pid == pid)
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|---|
| 438 | return jp;
|
|---|
| 439 | }
|
|---|
| 440 | }
|
|---|
| 441 | error("No such job: %s", name);
|
|---|
| 442 | }
|
|---|
| 443 |
|
|---|
| 444 |
|
|---|
| 445 |
|
|---|
| 446 | /*
|
|---|
| 447 | * Return a new job structure,
|
|---|
| 448 | */
|
|---|
| 449 |
|
|---|
| 450 | struct job *
|
|---|
| 451 | makejob(node, nprocs)
|
|---|
| 452 | union node *node;
|
|---|
| 453 | {
|
|---|
| 454 | int i;
|
|---|
| 455 | struct job *jp;
|
|---|
| 456 |
|
|---|
| 457 | for (i = njobs, jp = jobtab ; ; jp++) {
|
|---|
| 458 | if (--i < 0) {
|
|---|
| 459 | INTOFF;
|
|---|
| 460 | if (njobs == 0) {
|
|---|
| 461 | jobtab = ckmalloc(4 * sizeof jobtab[0]);
|
|---|
| 462 | } else {
|
|---|
| 463 | jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
|
|---|
| 464 | bcopy(jobtab, jp, njobs * sizeof jp[0]);
|
|---|
| 465 | for (i= 0; i<njobs; i++)
|
|---|
| 466 | {
|
|---|
| 467 | if (jobtab[i].ps == &jobtab[i].ps0)
|
|---|
| 468 | jp[i].ps= &jp[i].ps0;
|
|---|
| 469 | }
|
|---|
| 470 | ckfree(jobtab);
|
|---|
| 471 | jobtab = jp;
|
|---|
| 472 | }
|
|---|
| 473 | jp = jobtab + njobs;
|
|---|
| 474 | for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
|
|---|
| 475 | INTON;
|
|---|
| 476 | break;
|
|---|
| 477 | }
|
|---|
| 478 | if (jp->used == 0)
|
|---|
| 479 | break;
|
|---|
| 480 | }
|
|---|
| 481 | INTOFF;
|
|---|
| 482 | jp->state = 0;
|
|---|
| 483 | jp->used = 1;
|
|---|
| 484 | jp->changed = 0;
|
|---|
| 485 | jp->nprocs = 0;
|
|---|
| 486 | #if JOBS
|
|---|
| 487 | jp->jobctl = jobctl;
|
|---|
| 488 | #endif
|
|---|
| 489 | if (nprocs > 1) {
|
|---|
| 490 | jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
|
|---|
| 491 | } else {
|
|---|
| 492 | jp->ps = &jp->ps0;
|
|---|
| 493 | }
|
|---|
| 494 | INTON;
|
|---|
| 495 | TRACE(("makejob(0x%x, %d) returns %%%d\n", (int)node, nprocs, jp - jobtab + 1));
|
|---|
| 496 | return jp;
|
|---|
| 497 | }
|
|---|
| 498 |
|
|---|
| 499 |
|
|---|
| 500 | /*
|
|---|
| 501 | * Fork of a subshell. If we are doing job control, give the subshell its
|
|---|
| 502 | * own process group. Jp is a job structure that the job is to be added to.
|
|---|
| 503 | * N is the command that will be evaluated by the child. Both jp and n may
|
|---|
| 504 | * be NULL. The mode parameter can be one of the following:
|
|---|
| 505 | * FORK_FG - Fork off a foreground process.
|
|---|
| 506 | * FORK_BG - Fork off a background process.
|
|---|
| 507 | * FORK_NOJOB - Like FORK_FG, but don't give the process its own
|
|---|
| 508 | * process group even if job control is on.
|
|---|
| 509 | *
|
|---|
| 510 | * When job control is turned off, background processes have their standard
|
|---|
| 511 | * input redirected to /dev/null (except for the second and later processes
|
|---|
| 512 | * in a pipeline).
|
|---|
| 513 | */
|
|---|
| 514 |
|
|---|
| 515 | int
|
|---|
| 516 | forkshell(jp, n, mode)
|
|---|
| 517 | union node *n;
|
|---|
| 518 | struct job *jp;
|
|---|
| 519 | {
|
|---|
| 520 | int pid;
|
|---|
| 521 | int pgrp;
|
|---|
| 522 |
|
|---|
| 523 | TRACE(("forkshell(%%%d, 0x%x, %d) called\n", jp - jobtab, (int)n, mode));
|
|---|
| 524 | INTOFF;
|
|---|
| 525 | pid = fork();
|
|---|
| 526 | if (pid == -1) {
|
|---|
| 527 | TRACE(("Fork failed, errno=%d\n", errno));
|
|---|
| 528 | INTON;
|
|---|
| 529 | error("Cannot fork");
|
|---|
| 530 | }
|
|---|
| 531 | if (pid == 0) {
|
|---|
| 532 | struct job *p;
|
|---|
| 533 | int wasroot;
|
|---|
| 534 | int i;
|
|---|
| 535 |
|
|---|
| 536 | TRACE(("Child shell %d\n", getpid()));
|
|---|
| 537 | wasroot = rootshell;
|
|---|
| 538 | rootshell = 0;
|
|---|
| 539 | for (i = njobs, p = jobtab ; --i >= 0 ; p++)
|
|---|
| 540 | if (p->used)
|
|---|
| 541 | freejob(p);
|
|---|
| 542 | closescript();
|
|---|
| 543 | INTON;
|
|---|
| 544 | clear_traps();
|
|---|
| 545 | #if JOBS
|
|---|
| 546 | jobctl = 0; /* do job control only in root shell */
|
|---|
| 547 | if (wasroot && mode != FORK_NOJOB && jflag) {
|
|---|
| 548 | if (jp == NULL || jp->nprocs == 0)
|
|---|
| 549 | pgrp = getpid();
|
|---|
| 550 | else
|
|---|
| 551 | pgrp = jp->ps[0].pid;
|
|---|
| 552 | setpgrp(0, pgrp);
|
|---|
| 553 | if (mode == FORK_FG) {
|
|---|
| 554 | /*** this causes superfluous TIOCSPGRPS ***/
|
|---|
| 555 | if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0)
|
|---|
| 556 | error("TIOCSPGRP failed, errno=%d\n", errno);
|
|---|
| 557 | }
|
|---|
| 558 | setsignal(SIGTSTP);
|
|---|
| 559 | setsignal(SIGTTOU);
|
|---|
| 560 | } else if (mode == FORK_BG) {
|
|---|
| 561 | ignoresig(SIGINT);
|
|---|
| 562 | ignoresig(SIGQUIT);
|
|---|
| 563 | if ((jp == NULL || jp->nprocs == 0)
|
|---|
| 564 | && ! fd0_redirected_p ()) {
|
|---|
| 565 | close(0);
|
|---|
| 566 | if (open("/dev/null", O_RDONLY) != 0)
|
|---|
| 567 | error("Can't open /dev/null");
|
|---|
| 568 | }
|
|---|
| 569 | }
|
|---|
| 570 | #else
|
|---|
| 571 | if (mode == FORK_BG) {
|
|---|
| 572 | ignoresig(SIGINT);
|
|---|
| 573 | ignoresig(SIGQUIT);
|
|---|
| 574 | if ((jp == NULL || jp->nprocs == 0)
|
|---|
| 575 | && ! fd0_redirected_p ()) {
|
|---|
| 576 | close(0);
|
|---|
| 577 | if (open("/dev/null", O_RDONLY) != 0)
|
|---|
| 578 | error("Can't open /dev/null");
|
|---|
| 579 | }
|
|---|
| 580 | }
|
|---|
| 581 | #endif
|
|---|
| 582 | if (wasroot && iflag) {
|
|---|
| 583 | setsignal(SIGINT);
|
|---|
| 584 | setsignal(SIGQUIT);
|
|---|
| 585 | setsignal(SIGTERM);
|
|---|
| 586 | }
|
|---|
| 587 | return pid;
|
|---|
| 588 | }
|
|---|
| 589 | if (rootshell && mode != FORK_NOJOB && jflag) {
|
|---|
| 590 | if (jp == NULL || jp->nprocs == 0)
|
|---|
| 591 | pgrp = pid;
|
|---|
| 592 | else
|
|---|
| 593 | pgrp = jp->ps[0].pid;
|
|---|
| 594 | #if JOBS
|
|---|
| 595 | setpgrp(pid, pgrp);
|
|---|
| 596 | #endif
|
|---|
| 597 | }
|
|---|
| 598 | if (mode == FORK_BG)
|
|---|
| 599 | backgndpid = pid; /* set $! */
|
|---|
| 600 | if (jp) {
|
|---|
| 601 | struct procstat *ps = &jp->ps[jp->nprocs++];
|
|---|
| 602 | ps->pid = pid;
|
|---|
| 603 | ps->status = -1;
|
|---|
| 604 | ps->cmd = nullstr;
|
|---|
| 605 | if (iflag && rootshell && n)
|
|---|
| 606 | ps->cmd = commandtext(n);
|
|---|
| 607 | }
|
|---|
| 608 | INTON;
|
|---|
| 609 | TRACE(("In parent shell: child = %d\n", pid));
|
|---|
| 610 | return pid;
|
|---|
| 611 | }
|
|---|
| 612 |
|
|---|
| 613 |
|
|---|
| 614 |
|
|---|
| 615 | /*
|
|---|
| 616 | * Wait for job to finish.
|
|---|
| 617 | *
|
|---|
| 618 | * Under job control we have the problem that while a child process is
|
|---|
| 619 | * running interrupts generated by the user are sent to the child but not
|
|---|
| 620 | * to the shell. This means that an infinite loop started by an inter-
|
|---|
| 621 | * active user may be hard to kill. With job control turned off, an
|
|---|
| 622 | * interactive user may place an interactive program inside a loop. If
|
|---|
| 623 | * the interactive program catches interrupts, the user doesn't want
|
|---|
| 624 | * these interrupts to also abort the loop. The approach we take here
|
|---|
| 625 | * is to have the shell ignore interrupt signals while waiting for a
|
|---|
| 626 | * forground process to terminate, and then send itself an interrupt
|
|---|
| 627 | * signal if the child process was terminated by an interrupt signal.
|
|---|
| 628 | * Unfortunately, some programs want to do a bit of cleanup and then
|
|---|
| 629 | * exit on interrupt; unless these processes terminate themselves by
|
|---|
| 630 | * sending a signal to themselves (instead of calling exit) they will
|
|---|
| 631 | * confuse this approach.
|
|---|
| 632 | */
|
|---|
| 633 |
|
|---|
| 634 | int
|
|---|
| 635 | waitforjob(jp)
|
|---|
| 636 | register struct job *jp;
|
|---|
| 637 | {
|
|---|
| 638 | #if JOBS
|
|---|
| 639 | int mypgrp = getpgrp(0);
|
|---|
| 640 | #endif
|
|---|
| 641 | int status;
|
|---|
| 642 | int st;
|
|---|
| 643 |
|
|---|
| 644 | INTOFF;
|
|---|
| 645 | TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
|
|---|
| 646 | while (jp->state == 0 && dowait(1, jp) != -1) ;
|
|---|
| 647 | #if JOBS
|
|---|
| 648 | if (jp->jobctl) {
|
|---|
| 649 | if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0)
|
|---|
| 650 | error("TIOCSPGRP failed, errno=%d\n", errno);
|
|---|
| 651 | }
|
|---|
| 652 | if (jp->state == JOBSTOPPED)
|
|---|
| 653 | curjob = jp - jobtab + 1;
|
|---|
| 654 | #endif
|
|---|
| 655 | status = jp->ps[jp->nprocs - 1].status;
|
|---|
| 656 | /* convert to 8 bits */
|
|---|
| 657 | if ((status & 0xFF) == 0)
|
|---|
| 658 | st = status >> 8 & 0xFF;
|
|---|
| 659 | #if JOBS
|
|---|
| 660 | else if ((status & 0xFF) == 0177)
|
|---|
| 661 | st = (status >> 8 & 0x7F) + 128;
|
|---|
| 662 | #endif
|
|---|
| 663 | else
|
|---|
| 664 | st = (status & 0x7F) + 128;
|
|---|
| 665 | if (! JOBS || jp->state == JOBDONE)
|
|---|
| 666 | freejob(jp);
|
|---|
| 667 | CLEAR_PENDING_INT;
|
|---|
| 668 | if ((status & 0x7F) == SIGINT)
|
|---|
| 669 | kill(getpid(), SIGINT);
|
|---|
| 670 | INTON;
|
|---|
| 671 | return st;
|
|---|
| 672 | }
|
|---|
| 673 |
|
|---|
| 674 |
|
|---|
| 675 |
|
|---|
| 676 | /*
|
|---|
| 677 | * Wait for a process to terminate.
|
|---|
| 678 | */
|
|---|
| 679 |
|
|---|
| 680 | STATIC int
|
|---|
| 681 | dowait(block, job)
|
|---|
| 682 | struct job *job;
|
|---|
| 683 | {
|
|---|
| 684 | int pid;
|
|---|
| 685 | int status;
|
|---|
| 686 | struct procstat *sp;
|
|---|
| 687 | struct job *jp;
|
|---|
| 688 | struct job *thisjob;
|
|---|
| 689 | int done;
|
|---|
| 690 | int stopped;
|
|---|
| 691 | int core;
|
|---|
| 692 |
|
|---|
| 693 | TRACE(("dowait(%d) called\n", block));
|
|---|
| 694 | do {
|
|---|
| 695 | pid = waitproc(block, &status);
|
|---|
| 696 | TRACE(("wait returns %d, status=%d, errno=%d\n",
|
|---|
| 697 | pid, status, errno));
|
|---|
| 698 | } while (pid == -1 && errno == EINTR);
|
|---|
| 699 | if (pid <= 0)
|
|---|
| 700 | return pid;
|
|---|
| 701 | INTOFF;
|
|---|
| 702 | thisjob = NULL;
|
|---|
| 703 | for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
|
|---|
| 704 | if (jp->used) {
|
|---|
| 705 | done = 1;
|
|---|
| 706 | stopped = 1;
|
|---|
| 707 | for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
|
|---|
| 708 | if (sp->pid == -1)
|
|---|
| 709 | continue;
|
|---|
| 710 | if (sp->pid == pid) {
|
|---|
| 711 | TRACE(("Changin status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
|
|---|
| 712 | sp->status = status;
|
|---|
| 713 | thisjob = jp;
|
|---|
| 714 | }
|
|---|
| 715 | if (sp->status == -1)
|
|---|
| 716 | stopped = 0;
|
|---|
| 717 | else if ((sp->status & 0377) == 0177)
|
|---|
| 718 | done = 0;
|
|---|
| 719 | }
|
|---|
| 720 | if (stopped) { /* stopped or done */
|
|---|
| 721 | int state = done? JOBDONE : JOBSTOPPED;
|
|---|
| 722 | if (jp->state != state) {
|
|---|
| 723 | TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
|
|---|
| 724 | jp->state = state;
|
|---|
| 725 | #if JOBS
|
|---|
| 726 | if (done && curjob == jp - jobtab + 1)
|
|---|
| 727 | curjob = 0; /* no current job */
|
|---|
| 728 | #endif
|
|---|
| 729 | }
|
|---|
| 730 | }
|
|---|
| 731 | }
|
|---|
| 732 | }
|
|---|
| 733 | INTON;
|
|---|
| 734 | if (! rootshell || ! iflag || (job && thisjob == job)) {
|
|---|
| 735 | #if JOBS
|
|---|
| 736 | if ((status & 0xFF) == 0177)
|
|---|
| 737 | status >>= 8;
|
|---|
| 738 | #endif
|
|---|
| 739 | core = status & 0x80;
|
|---|
| 740 | status &= 0x7F;
|
|---|
| 741 | if (status != 0 && status != SIGINT && status != SIGPIPE) {
|
|---|
| 742 | if (thisjob != job)
|
|---|
| 743 | outfmt(out2, "%d: ", pid);
|
|---|
| 744 | #if JOBS
|
|---|
| 745 | if (status == SIGTSTP && rootshell && iflag)
|
|---|
| 746 | outfmt(out2, "%%%d ", job - jobtab + 1);
|
|---|
| 747 | #endif
|
|---|
| 748 | if (status <= MAXSIG && sigmesg[status])
|
|---|
| 749 | out2str(sigmesg[status]);
|
|---|
| 750 | else
|
|---|
| 751 | outfmt(out2, "Signal %d", status);
|
|---|
| 752 | if (core)
|
|---|
| 753 | out2str(" - core dumped");
|
|---|
| 754 | out2c('\n');
|
|---|
| 755 | flushout(&errout);
|
|---|
| 756 | } else {
|
|---|
| 757 | TRACE(("Not printing status: status=%d\n", status));
|
|---|
| 758 | }
|
|---|
| 759 | } else {
|
|---|
| 760 | TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
|
|---|
| 761 | if (thisjob)
|
|---|
| 762 | thisjob->changed = 1;
|
|---|
| 763 | }
|
|---|
| 764 | return pid;
|
|---|
| 765 | }
|
|---|
| 766 |
|
|---|
| 767 |
|
|---|
| 768 |
|
|---|
| 769 | /*
|
|---|
| 770 | * Do a wait system call. If job control is compiled in, we accept
|
|---|
| 771 | * stopped processes. If block is zero, we return a value of zero
|
|---|
| 772 | * rather than blocking.
|
|---|
| 773 | *
|
|---|
| 774 | * System V doesn't have a non-blocking wait system call. It does
|
|---|
| 775 | * have a SIGCLD signal that is sent to a process when one of it's
|
|---|
| 776 | * children dies. The obvious way to use SIGCLD would be to install
|
|---|
| 777 | * a handler for SIGCLD which simply bumped a counter when a SIGCLD
|
|---|
| 778 | * was received, and have waitproc bump another counter when it got
|
|---|
| 779 | * the status of a process. Waitproc would then know that a wait
|
|---|
| 780 | * system call would not block if the two counters were different.
|
|---|
| 781 | * This approach doesn't work because if a process has children that
|
|---|
| 782 | * have not been waited for, System V will send it a SIGCLD when it
|
|---|
| 783 | * installs a signal handler for SIGCLD. What this means is that when
|
|---|
| 784 | * a child exits, the shell will be sent SIGCLD signals continuously
|
|---|
| 785 | * until is runs out of stack space, unless it does a wait call before
|
|---|
| 786 | * restoring the signal handler. The code below takes advantage of
|
|---|
| 787 | * this (mis)feature by installing a signal handler for SIGCLD and
|
|---|
| 788 | * then checking to see whether it was called. If there are any
|
|---|
| 789 | * children to be waited for, it will be.
|
|---|
| 790 | *
|
|---|
| 791 | * If neither SYSV nor BSD is defined, we don't implement nonblocking
|
|---|
| 792 | * waits at all. In this case, the user will not be informed when
|
|---|
| 793 | * a background process until the next time she runs a real program
|
|---|
| 794 | * (as opposed to running a builtin command or just typing return),
|
|---|
| 795 | * and the jobs command may give out of date information.
|
|---|
| 796 | */
|
|---|
| 797 |
|
|---|
| 798 | #ifdef SYSV
|
|---|
| 799 | STATIC int gotsigchild;
|
|---|
| 800 |
|
|---|
| 801 | STATIC int onsigchild() {
|
|---|
| 802 | gotsigchild = 1;
|
|---|
| 803 | }
|
|---|
| 804 | #endif
|
|---|
| 805 |
|
|---|
| 806 |
|
|---|
| 807 | STATIC int
|
|---|
| 808 | waitproc(block, status)
|
|---|
| 809 | int *status;
|
|---|
| 810 | {
|
|---|
| 811 | #ifdef BSD
|
|---|
| 812 | int flags;
|
|---|
| 813 |
|
|---|
| 814 | #if JOBS
|
|---|
| 815 | flags = WUNTRACED;
|
|---|
| 816 | #else
|
|---|
| 817 | flags = 0;
|
|---|
| 818 | #endif
|
|---|
| 819 | if (block == 0)
|
|---|
| 820 | flags |= WNOHANG;
|
|---|
| 821 | return wait3((union wait *)status, flags, (struct rusage *)NULL);
|
|---|
| 822 | #else
|
|---|
| 823 | #ifdef SYSV
|
|---|
| 824 | int (*save)();
|
|---|
| 825 |
|
|---|
| 826 | if (block == 0) {
|
|---|
| 827 | gotsigchild = 0;
|
|---|
| 828 | save = signal(SIGCLD, onsigchild);
|
|---|
| 829 | signal(SIGCLD, save);
|
|---|
| 830 | if (gotsigchild == 0)
|
|---|
| 831 | return 0;
|
|---|
| 832 | }
|
|---|
| 833 | return wait(status);
|
|---|
| 834 | #else
|
|---|
| 835 | #if POSIX
|
|---|
| 836 | return waitpid(-1, status, block == 0 ? WNOHANG : 0);
|
|---|
| 837 | #else
|
|---|
| 838 | if (block == 0)
|
|---|
| 839 | return 0;
|
|---|
| 840 | return wait(status);
|
|---|
| 841 | #endif
|
|---|
| 842 | #endif
|
|---|
| 843 | #endif
|
|---|
| 844 | }
|
|---|
| 845 |
|
|---|
| 846 |
|
|---|
| 847 |
|
|---|
| 848 | /*
|
|---|
| 849 | * Return a string identifying a command (to be printed by the
|
|---|
| 850 | * jobs command.
|
|---|
| 851 | */
|
|---|
| 852 |
|
|---|
| 853 | STATIC char *cmdnextc;
|
|---|
| 854 | STATIC int cmdnleft;
|
|---|
| 855 | STATIC void cmdtxt(), cmdputs();
|
|---|
| 856 |
|
|---|
| 857 | STATIC char *
|
|---|
| 858 | commandtext(n)
|
|---|
| 859 | union node *n;
|
|---|
| 860 | {
|
|---|
| 861 | char *name;
|
|---|
| 862 |
|
|---|
| 863 | cmdnextc = name = ckmalloc(50);
|
|---|
| 864 | cmdnleft = 50 - 4;
|
|---|
| 865 | cmdtxt(n);
|
|---|
| 866 | *cmdnextc = '\0';
|
|---|
| 867 | return name;
|
|---|
| 868 | }
|
|---|
| 869 |
|
|---|
| 870 |
|
|---|
| 871 | STATIC void
|
|---|
| 872 | cmdtxt(n)
|
|---|
| 873 | union node *n;
|
|---|
| 874 | {
|
|---|
| 875 | union node *np;
|
|---|
| 876 | struct nodelist *lp;
|
|---|
| 877 | char *p;
|
|---|
| 878 | int i;
|
|---|
| 879 | char s[2];
|
|---|
| 880 |
|
|---|
| 881 | if (n == NULL) return;
|
|---|
| 882 |
|
|---|
| 883 | switch (n->type) {
|
|---|
| 884 | case NSEMI:
|
|---|
| 885 | cmdtxt(n->nbinary.ch1);
|
|---|
| 886 | cmdputs("; ");
|
|---|
| 887 | cmdtxt(n->nbinary.ch2);
|
|---|
| 888 | break;
|
|---|
| 889 | case NAND:
|
|---|
| 890 | cmdtxt(n->nbinary.ch1);
|
|---|
| 891 | cmdputs(" && ");
|
|---|
| 892 | cmdtxt(n->nbinary.ch2);
|
|---|
| 893 | break;
|
|---|
| 894 | case NOR:
|
|---|
| 895 | cmdtxt(n->nbinary.ch1);
|
|---|
| 896 | cmdputs(" || ");
|
|---|
| 897 | cmdtxt(n->nbinary.ch2);
|
|---|
| 898 | break;
|
|---|
| 899 | case NPIPE:
|
|---|
| 900 | for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
|
|---|
| 901 | cmdtxt(lp->n);
|
|---|
| 902 | if (lp->next)
|
|---|
| 903 | cmdputs(" | ");
|
|---|
| 904 | }
|
|---|
| 905 | break;
|
|---|
| 906 | case NSUBSHELL:
|
|---|
| 907 | cmdputs("(");
|
|---|
| 908 | cmdtxt(n->nredir.n);
|
|---|
| 909 | cmdputs(")");
|
|---|
| 910 | break;
|
|---|
| 911 | case NREDIR:
|
|---|
| 912 | case NBACKGND:
|
|---|
| 913 | cmdtxt(n->nredir.n);
|
|---|
| 914 | break;
|
|---|
| 915 | case NIF:
|
|---|
| 916 | cmdputs("if ");
|
|---|
| 917 | cmdtxt(n->nif.test);
|
|---|
| 918 | cmdputs("; then ");
|
|---|
| 919 | cmdtxt(n->nif.ifpart);
|
|---|
| 920 | cmdputs("...");
|
|---|
| 921 | break;
|
|---|
| 922 | case NWHILE:
|
|---|
| 923 | cmdputs("while ");
|
|---|
| 924 | goto until;
|
|---|
| 925 | case NUNTIL:
|
|---|
| 926 | cmdputs("until ");
|
|---|
| 927 | until:
|
|---|
| 928 | cmdtxt(n->nbinary.ch1);
|
|---|
| 929 | cmdputs("; do ");
|
|---|
| 930 | cmdtxt(n->nbinary.ch2);
|
|---|
| 931 | cmdputs("; done");
|
|---|
| 932 | break;
|
|---|
| 933 | case NFOR:
|
|---|
| 934 | cmdputs("for ");
|
|---|
| 935 | cmdputs(n->nfor.var);
|
|---|
| 936 | cmdputs(" in ...");
|
|---|
| 937 | break;
|
|---|
| 938 | case NCASE:
|
|---|
| 939 | cmdputs("case ");
|
|---|
| 940 | cmdputs(n->ncase.expr->narg.text);
|
|---|
| 941 | cmdputs(" in ...");
|
|---|
| 942 | break;
|
|---|
| 943 | case NDEFUN:
|
|---|
| 944 | cmdputs(n->narg.text);
|
|---|
| 945 | cmdputs("() ...");
|
|---|
| 946 | break;
|
|---|
| 947 | case NCMD:
|
|---|
| 948 | for (np = n->ncmd.args ; np ; np = np->narg.next) {
|
|---|
| 949 | cmdtxt(np);
|
|---|
| 950 | if (np->narg.next)
|
|---|
| 951 | cmdputs(" ");
|
|---|
| 952 | }
|
|---|
| 953 | for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
|
|---|
| 954 | cmdputs(" ");
|
|---|
| 955 | cmdtxt(np);
|
|---|
| 956 | }
|
|---|
| 957 | break;
|
|---|
| 958 | case NARG:
|
|---|
| 959 | cmdputs(n->narg.text);
|
|---|
| 960 | break;
|
|---|
| 961 | case NTO:
|
|---|
| 962 | p = ">"; i = 1; goto redir;
|
|---|
| 963 | case NAPPEND:
|
|---|
| 964 | p = ">>"; i = 1; goto redir;
|
|---|
| 965 | case NTOFD:
|
|---|
| 966 | p = ">&"; i = 1; goto redir;
|
|---|
| 967 | case NFROM:
|
|---|
| 968 | p = "<"; i = 0; goto redir;
|
|---|
| 969 | case NFROMFD:
|
|---|
| 970 | p = "<&"; i = 0; goto redir;
|
|---|
| 971 | redir:
|
|---|
| 972 | if (n->nfile.fd != i) {
|
|---|
| 973 | s[0] = n->nfile.fd + '0';
|
|---|
| 974 | s[1] = '\0';
|
|---|
| 975 | cmdputs(s);
|
|---|
| 976 | }
|
|---|
| 977 | cmdputs(p);
|
|---|
| 978 | if (n->type == NTOFD || n->type == NFROMFD) {
|
|---|
| 979 | s[0] = n->ndup.dupfd + '0';
|
|---|
| 980 | s[1] = '\0';
|
|---|
| 981 | cmdputs(s);
|
|---|
| 982 | } else {
|
|---|
| 983 | cmdtxt(n->nfile.fname);
|
|---|
| 984 | }
|
|---|
| 985 | break;
|
|---|
| 986 | case NHERE:
|
|---|
| 987 | case NXHERE:
|
|---|
| 988 | cmdputs("<<...");
|
|---|
| 989 | break;
|
|---|
| 990 | default:
|
|---|
| 991 | cmdputs("???");
|
|---|
| 992 | break;
|
|---|
| 993 | }
|
|---|
| 994 | }
|
|---|
| 995 |
|
|---|
| 996 |
|
|---|
| 997 |
|
|---|
| 998 | STATIC void
|
|---|
| 999 | cmdputs(s)
|
|---|
| 1000 | char *s;
|
|---|
| 1001 | {
|
|---|
| 1002 | register char *p, *q;
|
|---|
| 1003 | register char c;
|
|---|
| 1004 | int subtype = 0;
|
|---|
| 1005 |
|
|---|
| 1006 | if (cmdnleft <= 0)
|
|---|
| 1007 | return;
|
|---|
| 1008 | p = s;
|
|---|
| 1009 | q = cmdnextc;
|
|---|
| 1010 | while ((c = *p++) != '\0') {
|
|---|
| 1011 | if (c == CTLESC)
|
|---|
| 1012 | *q++ = *p++;
|
|---|
| 1013 | else if (c == CTLVAR) {
|
|---|
| 1014 | *q++ = '$';
|
|---|
| 1015 | if (--cmdnleft > 0)
|
|---|
| 1016 | *q++ = '{';
|
|---|
| 1017 | subtype = *p++;
|
|---|
| 1018 | } else if (c == '=' && subtype != 0) {
|
|---|
| 1019 | *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
|
|---|
| 1020 | subtype = 0;
|
|---|
| 1021 | } else if (c == CTLENDVAR) {
|
|---|
| 1022 | *q++ = '}';
|
|---|
| 1023 | } else if (c == CTLBACKQ | c == CTLBACKQ+CTLQUOTE)
|
|---|
| 1024 | cmdnleft++; /* ignore it */
|
|---|
| 1025 | else
|
|---|
| 1026 | *q++ = c;
|
|---|
| 1027 | if (--cmdnleft <= 0) {
|
|---|
| 1028 | *q++ = '.';
|
|---|
| 1029 | *q++ = '.';
|
|---|
| 1030 | *q++ = '.';
|
|---|
| 1031 | break;
|
|---|
| 1032 | }
|
|---|
| 1033 | }
|
|---|
| 1034 | cmdnextc = q;
|
|---|
| 1035 | }
|
|---|
