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util-linux/misc-utils/kill.c

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/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* oct 5 1994 -- almost entirely re-written to allow for process names.
* modifications (c) salvatore valente <svalente@mit.edu>
* may be used / modified / distributed under the same terms as the original.
*
* 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
* - added Native Language Support
*
* 1999-11-13 aeb Accept signal numers 128+s.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h> /* for isdigit() */
#include <unistd.h>
#include <signal.h>
#include "c.h"
#include "nls.h"
#include "closestream.h"
#include "procutils.h"
#include "strutils.h"
#include "ttyutils.h"
#include "xalloc.h"
struct signv {
const char *name;
int val;
} sys_signame[] = {
/* POSIX signals */
{ "HUP", SIGHUP }, /* 1 */
{ "INT", SIGINT }, /* 2 */
{ "QUIT", SIGQUIT }, /* 3 */
{ "ILL", SIGILL }, /* 4 */
#ifdef SIGTRAP
{ "TRAP", SIGTRAP }, /* 5 */
#endif
{ "ABRT", SIGABRT }, /* 6 */
#ifdef SIGIOT
{ "IOT", SIGIOT }, /* 6, same as SIGABRT */
#endif
#ifdef SIGEMT
{ "EMT", SIGEMT }, /* 7 (mips,alpha,sparc*) */
#endif
#ifdef SIGBUS
{ "BUS", SIGBUS }, /* 7 (arm,i386,m68k,ppc), 10 (mips,alpha,sparc*) */
#endif
{ "FPE", SIGFPE }, /* 8 */
{ "KILL", SIGKILL }, /* 9 */
{ "USR1", SIGUSR1 }, /* 10 (arm,i386,m68k,ppc), 30 (alpha,sparc*), 16 (mips) */
{ "SEGV", SIGSEGV }, /* 11 */
{ "USR2", SIGUSR2 }, /* 12 (arm,i386,m68k,ppc), 31 (alpha,sparc*), 17 (mips) */
{ "PIPE", SIGPIPE }, /* 13 */
{ "ALRM", SIGALRM }, /* 14 */
{ "TERM", SIGTERM }, /* 15 */
#ifdef SIGSTKFLT
{ "STKFLT", SIGSTKFLT }, /* 16 (arm,i386,m68k,ppc) */
#endif
{ "CHLD", SIGCHLD }, /* 17 (arm,i386,m68k,ppc), 20 (alpha,sparc*), 18 (mips) */
#ifdef SIGCLD
{ "CLD", SIGCLD }, /* same as SIGCHLD (mips) */
#endif
{ "CONT", SIGCONT }, /* 18 (arm,i386,m68k,ppc), 19 (alpha,sparc*), 25 (mips) */
{ "STOP", SIGSTOP }, /* 19 (arm,i386,m68k,ppc), 17 (alpha,sparc*), 23 (mips) */
{ "TSTP", SIGTSTP }, /* 20 (arm,i386,m68k,ppc), 18 (alpha,sparc*), 24 (mips) */
{ "TTIN", SIGTTIN }, /* 21 (arm,i386,m68k,ppc,alpha,sparc*), 26 (mips) */
{ "TTOU", SIGTTOU }, /* 22 (arm,i386,m68k,ppc,alpha,sparc*), 27 (mips) */
#ifdef SIGURG
{ "URG", SIGURG }, /* 23 (arm,i386,m68k,ppc), 16 (alpha,sparc*), 21 (mips) */
#endif
#ifdef SIGXCPU
{ "XCPU", SIGXCPU }, /* 24 (arm,i386,m68k,ppc,alpha,sparc*), 30 (mips) */
#endif
#ifdef SIGXFSZ
{ "XFSZ", SIGXFSZ }, /* 25 (arm,i386,m68k,ppc,alpha,sparc*), 31 (mips) */
#endif
#ifdef SIGVTALRM
{ "VTALRM", SIGVTALRM }, /* 26 (arm,i386,m68k,ppc,alpha,sparc*), 28 (mips) */
#endif
#ifdef SIGPROF
{ "PROF", SIGPROF }, /* 27 (arm,i386,m68k,ppc,alpha,sparc*), 29 (mips) */
#endif
#ifdef SIGWINCH
{ "WINCH", SIGWINCH }, /* 28 (arm,i386,m68k,ppc,alpha,sparc*), 20 (mips) */
#endif
#ifdef SIGIO
{ "IO", SIGIO }, /* 29 (arm,i386,m68k,ppc), 23 (alpha,sparc*), 22 (mips) */
#endif
#ifdef SIGPOLL
{ "POLL", SIGPOLL }, /* same as SIGIO */
#endif
#ifdef SIGINFO
{ "INFO", SIGINFO }, /* 29 (alpha) */
#endif
#ifdef SIGLOST
{ "LOST", SIGLOST }, /* 29 (arm,i386,m68k,ppc,sparc*) */
#endif
#ifdef SIGPWR
{ "PWR", SIGPWR }, /* 30 (arm,i386,m68k,ppc), 29 (alpha,sparc*), 19 (mips) */
#endif
#ifdef SIGUNUSED
{ "UNUSED", SIGUNUSED }, /* 31 (arm,i386,m68k,ppc) */
#endif
#ifdef SIGSYS
{ "SYS", SIGSYS }, /* 31 (mips,alpha,sparc*) */
#endif
};
static int arg_to_signum (char *arg, int mask);
static void nosig (char *name);
static void printsig (int sig);
static void printsignals (FILE *fp, int pretty);
static int usage (int status);
static int kill_verbose (char *procname, int pid, int sig);
#ifdef HAVE_SIGQUEUE
static int use_sigval;
static union sigval sigdata;
#endif
int main (int argc, char *argv[])
{
int errors, numsig, pid;
char *ep, *arg;
int do_pid, do_kill, check_all;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
numsig = SIGTERM;
do_pid = (! strcmp (program_invocation_short_name, "pid")); /* Yecch */
do_kill = 0;
check_all = 0;
/* loop through the arguments.
actually, -a is the only option can be used with other options.
`kill' is basically a one-option-at-most program. */
for (argc--, argv++; argc > 0; argc--, argv++) {
arg = *argv;
if (*arg != '-') {
break;
}
if (! strcmp (arg, "--")) {
argc--, argv++;
break;
}
if (! strcmp (arg, "-v") || ! strcmp (arg, "-V") ||
! strcmp (arg, "--version")) {
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
}
if (! strcmp (arg, "-h") || ! strcmp (arg, "--help"))
return usage(EXIT_FAILURE);
if (! strcmp (arg, "-a") || ! strcmp (arg, "--all")) {
check_all++;
continue;
}
if (! strcmp (arg, "-l") || ! strcmp (arg, "--list")) {
if (argc < 2) {
printsignals (stdout, 0);
return EXIT_SUCCESS;
}
if (argc > 2)
return usage (EXIT_FAILURE);
/* argc == 2, accept "kill -l $?" */
arg = argv[1];
if ((numsig = arg_to_signum (arg, 1)) < 0)
errx(EXIT_FAILURE, _("unknown signal: %s"), arg);
printsig (numsig);
return EXIT_SUCCESS;
}
/* for compatibility with procps kill(1) */
if (! strncmp (arg, "--list=", 7) || ! strncmp (arg, "-l=", 3)) {
char *p = strchr(arg, '=') + 1;
if ((numsig = arg_to_signum(p, 1)) < 0)
errx(EXIT_FAILURE, _("unknown signal: %s"), p);
printsig (numsig);
return EXIT_SUCCESS;
}
if (! strcmp (arg, "-L") || ! strcmp (arg, "--table")) {
printsignals (stdout, 1);
return EXIT_SUCCESS;
}
if (! strcmp (arg, "-p") || ! strcmp (arg, "--pid")) {
do_pid++;
if (do_kill)
return usage (EXIT_FAILURE);
continue;
}
if (! strcmp (arg, "-s") || ! strcmp (arg, "--signal")) {
if (argc < 2) {
return usage (EXIT_FAILURE);
}
do_kill++;
if (do_pid)
return usage (EXIT_FAILURE);
argc--, argv++;
arg = *argv;
if ((numsig = arg_to_signum (arg, 0)) < 0) {
nosig (arg);
return EXIT_FAILURE;
}
continue;
}
if (! strcmp (arg, "-q") || ! strcmp (arg, "--queue")) {
if (argc < 2)
return usage (EXIT_FAILURE);
argc--, argv++;
arg = *argv;
#ifdef HAVE_SIGQUEUE
sigdata.sival_int = strtos32_or_err(arg, _("invalid sigval argument"));
use_sigval = 1;
#endif
continue;
}
/* `arg' begins with a dash but is not a known option.
so it's probably something like -HUP, or -1/-n
try to deal with it.
-n could be signal n, or pid -n (i.e. process group n).
In case of doubt POSIX tells us to assume a signal.
If a signal has been parsed, assume it's a pid, break */
if (do_kill)
break;
arg++;
if ((numsig = arg_to_signum (arg, 0)) < 0) {
return usage (EXIT_FAILURE);
}
do_kill++;
if (do_pid)
return usage (EXIT_FAILURE);
continue;
}
if (! *argv) {
return usage (EXIT_FAILURE);
}
if (do_pid) {
numsig = -1;
}
/* we're done with the options.
the rest of the arguments should be process ids and names.
kill them. */
for (errors = 0; (arg = *argv) != NULL; argv++) {
pid = strtol (arg, &ep, 10);
if (! *ep)
errors += kill_verbose (arg, pid, numsig);
else {
struct proc_processes *ps = proc_open_processes();
int ct = 0;
if (!ps)
continue;
if (!check_all)
proc_processes_filter_by_uid(ps, getuid());
proc_processes_filter_by_name(ps, arg);
while (proc_next_pid(ps, &pid) == 0) {
errors += kill_verbose(arg, pid, numsig);
ct++;
}
if (!ct) {
errors++;
warnx (_("cannot find process \"%s\""), arg);
}
proc_close_processes(ps);
}
}
if (errors != 0)
errors = EXIT_FAILURE;
return errors;
}
#ifdef SIGRTMIN
static int rtsig_to_signum(char *sig)
{
int num, maxi = 0;
char *ep = NULL;
if (strncasecmp(sig, "min+", 4) == 0)
sig += 4;
else if (strncasecmp(sig, "max-", 4) == 0) {
sig += 4;
maxi = 1;
}
if (!isdigit(*sig))
return -1;
errno = 0;
num = strtol(sig, &ep, 10);
if (!ep || sig == ep || errno || num < 0)
return -1;
num = maxi ? SIGRTMAX - num : SIGRTMIN + num;
if (num < SIGRTMIN || num > SIGRTMAX)
return -1;
return num;
}
#endif
static int signame_to_signum (char *sig)
{
size_t n;
if (! strncasecmp (sig, "sig", 3))
sig += 3;
#ifdef SIGRTMIN
/* RT signals */
if (!strncasecmp(sig, "rt", 2))
return rtsig_to_signum(sig + 2);
#endif
/* Normal sugnals */
for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
if (! strcasecmp (sys_signame[n].name, sig))
return sys_signame[n].val;
}
return (-1);
}
static int arg_to_signum (char *arg, int maskbit)
{
int numsig;
char *ep;
if (isdigit (*arg)) {
numsig = strtol (arg, &ep, 10);
if (numsig >= NSIG && maskbit && (numsig & 128) != 0)
numsig -= 128;
if (*ep != 0 || numsig < 0 || numsig >= NSIG)
return (-1);
return (numsig);
}
return signame_to_signum (arg);
}
static void nosig (char *name)
{
warnx (_("unknown signal %s; valid signals:"), name);
printsignals (stderr, 1);
}
static void printsig (int sig)
{
size_t n;
for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
if (sys_signame[n].val == sig) {
printf ("%s\n", sys_signame[n].name);
return;
}
}
#ifdef SIGRTMIN
if (sig >= SIGRTMIN && sig <= SIGRTMAX) {
printf ("RT%d\n", sig - SIGRTMIN);
return;
}
#endif
printf("%d\n", sig);
}
#define FIELD_WIDTH 11
static void pretty_print_signal(FILE *fp, size_t term_width, size_t *lpos,
int signum, const char *name)
{
if (term_width < (*lpos + FIELD_WIDTH)) {
fputc ('\n', fp);
*lpos = 0;
}
*lpos += FIELD_WIDTH;
fprintf (fp, "%2d %-8s", signum, name);
}
static void printsignals (FILE *fp, int pretty)
{
size_t n, lth, lpos = 0, width;
if (!pretty) {
for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
lth = 1+strlen(sys_signame[n].name);
if (lpos+lth > 72) {
fputc ('\n', fp);
lpos = 0;
} else if (lpos)
fputc (' ', fp);
lpos += lth;
fputs (sys_signame[n].name, fp);
}
#ifdef SIGRTMIN
fputs (" RT<N> RTMIN+<N> RTMAX-<N>", fp);
#endif
fputc ('\n', fp);
return;
}
/* pretty print */
width = get_terminal_width();
if (width == 0)
width = 72;
else
width -= 1;
for (n = 0; n < ARRAY_SIZE(sys_signame); n++)
pretty_print_signal(fp, width, &lpos,
sys_signame[n].val, sys_signame[n].name);
#ifdef SIGRTMIN
pretty_print_signal(fp, width, &lpos, SIGRTMIN, "RTMIN");
pretty_print_signal(fp, width, &lpos, SIGRTMAX, "RTMAX");
#endif
fputc ('\n', fp);
}
static int usage(int status)
{
FILE *out = (status == 0 ? stdout : stderr);
fputs(USAGE_HEADER, out);
fprintf(out, _(" %s [options] <pid|name> [...]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -a, --all do not restrict the name-to-pid conversion to processes\n"
" with the same uid as the present process\n"), out);
fputs(_(" -s, --signal <sig> send specified signal\n"), out);
fputs(_(" -q, --queue <sig> use sigqueue(2) rather than kill(2)\n"), out);
fputs(_(" -p, --pid print pids without signaling them\n"), out);
fputs(_(" -l, --list [=<signal>] list signal names, or convert one to a name\n"), out);
fputs(_(" -L, --table list signal names and numbers\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("kill(1)"));
return status;
}
static int kill_verbose (char *procname, pid_t pid, int sig)
{
int rc = 0;
if (sig < 0) {
printf ("%ld\n", (long)pid);
return 0;
}
#ifdef HAVE_SIGQUEUE
if (use_sigval)
rc = sigqueue(pid, sig, sigdata);
else
#endif
rc = kill (pid, sig);
if (rc < 0) {
warn(_("sending signal to %s failed"), procname);
return 1;
}
return 0;
}
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