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/*
* kill.c - send a signal to process
*
* Copyright © 1995-2023 Craig Small <csmall@dropbear.xyz>
* Copyright © 1998-2002 Albert Cahalan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <unistd.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <signal.h>
#include <ctype.h>
#include "c.h"
#include "signals.h"
#include "strutils.h"
#include "nls.h"
/* kill help */
static void __attribute__ ((__noreturn__)) print_usage(FILE * out)
{
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options] <pid> [...]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" <pid> [...] send signal to every <pid> listed\n"), out);
fputs(_(" -<signal>, -s, --signal <signal>\n"
" specify the <signal> to be sent\n"), out);
fputs(_(" -q, --queue <value> integer value to be sent with the signal\n"), out);
fputs(_(" -l, --list=[<signal>] list all signal names, or convert one to a name\n"), out);
fputs(_(" -L, --table list all signal names in a nice table\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("kill(1)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
inline static int execute_kill(pid_t pid, int sig_num, const bool use_sigqueue, union sigval sigval)
{
if (use_sigqueue)
return sigqueue(pid, sig_num, sigval);
else
return kill(pid, sig_num);
}
int main(int argc, char **argv)
{
int signo, i;
long pid;
int exitvalue = EXIT_SUCCESS;
int optindex;
union sigval sigval;
bool use_sigqueue = false;
char *sig_option;
static const struct option longopts[] = {
{"list", optional_argument, NULL, 'l'},
{"table", no_argument, NULL, 'L'},
{"signal", required_argument, NULL, 's'},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{"queue", required_argument, NULL, 'q'},
{NULL, 0, NULL, 0}
};
setlocale (LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
if (argc < 2)
print_usage(stderr);
signo = skill_sig_option(&argc, argv);
if (signo < 0)
signo = SIGTERM;
opterr=0; /* suppress errors on -123 */
while ((i = getopt_long(argc, argv, "l::Ls:hVq:", longopts, &optindex)) != -1)
switch (i) {
case 'l':
sig_option = NULL;
if (optarg) {
sig_option = optarg;
} else if (argv[optind] != NULL && argv[optind][0] != '-') {
sig_option = argv[optind];
}
if (sig_option) {
char *s;
s = strtosig(sig_option);
if (s)
printf("%s\n", s);
else
xwarnx(_("unknown signal name %s"),
sig_option);
free(s);
} else {
unix_print_signals();
}
exit(EXIT_SUCCESS);
case 'L':
pretty_print_signals();
exit(EXIT_SUCCESS);
case 's':
signo = signal_name_to_number(optarg);
break;
case 'h':
print_usage(stdout);
case 'V':
fprintf(stdout, PROCPS_NG_VERSION);
exit(EXIT_SUCCESS);
case 'q':
sigval.sival_int = strtol_or_err(optarg, _("must be an integer value to be passed with the signal."));
use_sigqueue = true;
break;
case '?':
if (!isdigit(optopt)) {
xwarnx(_("invalid argument %c"), optopt);
print_usage(stderr);
} else {
/* Special case for signal digit negative
* PIDs */
pid = (long)('0' - optopt);
if (!execute_kill((pid_t) pid, signo, use_sigqueue, sigval))
exitvalue = EXIT_FAILURE;
exit(exitvalue);
}
xerrx(EXIT_FAILURE, _("internal error"));
default:
print_usage(stderr);
}
argc -= optind;
argv += optind;
if (argc < 1)
print_usage(stderr);
for (i = 0; i < argc; i++) {
pid = strtol_or_err(argv[i], _("failed to parse argument"));
if (!execute_kill((pid_t) pid, signo, use_sigqueue, sigval))
continue;
error(0, errno, "(%ld)", pid);
exitvalue = EXIT_FAILURE;
continue;
}
return exitvalue;
}
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