If a job has terminated but is still known, silently do nothing when using the kill builtin with the job specifier. Formerly, the shell called kill() with the process group ID that might have been reused.
216 lines
5.0 KiB
C
216 lines
5.0 KiB
C
/*-
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Important: This file is used both as a standalone program /bin/kill and
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* as a builtin for /bin/sh (#define SHELL).
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*/
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#if 0
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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1988, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)kill.c 8.4 (Berkeley) 4/28/95";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifdef SHELL
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#define main killcmd
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#include "bltin/bltin.h"
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#include "error.h"
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#endif
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static void nosig(const char *);
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static void printsignals(FILE *);
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static int signame_to_signum(const char *);
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static void usage(void);
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int
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main(int argc, char *argv[])
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{
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int errors, numsig, pid;
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char *ep;
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if (argc < 2)
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usage();
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numsig = SIGTERM;
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argc--, argv++;
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if (!strcmp(*argv, "-l")) {
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argc--, argv++;
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if (argc > 1)
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usage();
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if (argc == 1) {
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if (!isdigit(**argv))
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usage();
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numsig = strtol(*argv, &ep, 10);
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if (!**argv || *ep)
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errx(2, "illegal signal number: %s", *argv);
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if (numsig >= 128)
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numsig -= 128;
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if (numsig <= 0 || numsig >= sys_nsig)
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nosig(*argv);
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printf("%s\n", sys_signame[numsig]);
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return (0);
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}
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printsignals(stdout);
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return (0);
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}
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if (!strcmp(*argv, "-s")) {
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argc--, argv++;
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if (argc < 1) {
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warnx("option requires an argument -- s");
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usage();
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}
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if (strcmp(*argv, "0")) {
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if ((numsig = signame_to_signum(*argv)) < 0)
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nosig(*argv);
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} else
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numsig = 0;
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argc--, argv++;
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} else if (**argv == '-' && *(*argv + 1) != '-') {
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++*argv;
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if (isalpha(**argv)) {
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if ((numsig = signame_to_signum(*argv)) < 0)
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nosig(*argv);
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} else if (isdigit(**argv)) {
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numsig = strtol(*argv, &ep, 10);
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if (!**argv || *ep)
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errx(2, "illegal signal number: %s", *argv);
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if (numsig < 0)
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nosig(*argv);
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} else
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nosig(*argv);
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argc--, argv++;
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}
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if (argc > 0 && strncmp(*argv, "--", 2) == 0)
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argc--, argv++;
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if (argc == 0)
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usage();
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for (errors = 0; argc; argc--, argv++) {
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#ifdef SHELL
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if (**argv == '%') {
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pid = getjobpgrp(*argv);
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/*
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* Silently ignore terminated jobs, like the kernel
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* silently ignores zombies.
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*/
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if (pid == 0)
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continue;
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} else
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#endif
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{
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pid = strtol(*argv, &ep, 10);
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if (!**argv || *ep)
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errx(2, "illegal process id: %s", *argv);
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}
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if (kill(pid, numsig) == -1) {
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warn("%s", *argv);
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errors = 1;
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}
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}
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return (errors);
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}
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static int
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signame_to_signum(const char *sig)
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{
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int n;
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if (strncasecmp(sig, "SIG", 3) == 0)
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sig += 3;
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for (n = 1; n < sys_nsig; n++) {
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if (!strcasecmp(sys_signame[n], sig))
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return (n);
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}
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return (-1);
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}
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static void
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nosig(const char *name)
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{
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warnx("unknown signal %s; valid signals:", name);
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printsignals(stderr);
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#ifdef SHELL
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error(NULL);
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#else
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exit(2);
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#endif
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}
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static void
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printsignals(FILE *fp)
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{
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int n;
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for (n = 1; n < sys_nsig; n++) {
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(void)fprintf(fp, "%s", sys_signame[n]);
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if (n == (sys_nsig / 2) || n == (sys_nsig - 1))
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(void)fprintf(fp, "\n");
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else
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(void)fprintf(fp, " ");
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}
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
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"usage: kill [-s signal_name] pid ...",
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" kill -l [exit_status]",
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" kill -signal_name pid ...",
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" kill -signal_number pid ...");
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#ifdef SHELL
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error(NULL);
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#else
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exit(2);
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#endif
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}
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