/* kill -- send a signal to a process
Copyright (C) 2002-2018 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include <signal.h>
#include "system.h"
#include "error.h"
#include "sig2str.h"
#include "operand2sig.h"
#include "quote.h"
/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "kill"
#define AUTHORS proper_name ("Paul Eggert")
#if ! (HAVE_DECL_STRSIGNAL || defined strsignal)
# if ! (HAVE_DECL_SYS_SIGLIST || defined sys_siglist)
# if HAVE_DECL__SYS_SIGLIST || defined _sys_siglist
# define sys_siglist _sys_siglist
# elif HAVE_DECL___SYS_SIGLIST || defined __sys_siglist
# define sys_siglist __sys_siglist
# endif
# endif
# if HAVE_DECL_SYS_SIGLIST || defined sys_siglist
# define strsignal(signum) (0 <= (signum) && (signum) <= SIGNUM_BOUND \
? sys_siglist[signum] \
: 0)
# endif
# ifndef strsignal
# define strsignal(signum) 0
# endif
#endif
static char const short_options[] =
"0::1::2::3::4::5::6::7::8::9::"
"A::B::C::D::E::F::G::H::I::J::K::M::"
"N::O::P::Q::R::S::T::U::V::W::X::Y::Z::"
"Lln:s:t";
static struct option const long_options[] =
{
{"list", no_argument, NULL, 'l'},
{"signal", required_argument, NULL, 's'},
{"table", no_argument, NULL, 't'},
{GETOPT_HELP_OPTION_DECL},
{GETOPT_VERSION_OPTION_DECL},
{NULL, 0, NULL, 0}
};
void
usage (int status)
{
if (status != EXIT_SUCCESS)
emit_try_help ();
else
{
printf (_("\
Usage: %s [-s SIGNAL | -SIGNAL] PID...\n\
or: %s -l [SIGNAL]...\n\
or: %s -t [SIGNAL]...\n\
"),
program_name, program_name, program_name);
fputs (_("\
Send signals to processes, or list signals.\n\
"), stdout);
emit_mandatory_arg_note ();
fputs (_("\
-s, --signal=SIGNAL, -SIGNAL\n\
specify the name or number of the signal to be sent\n\
-l, --list list signal names, or convert signal names to/from numbers\n\
-t, --table print a table of signal information\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
fputs (_("\n\
SIGNAL may be a signal name like 'HUP', or a signal number like '1',\n\
or the exit status of a process terminated by a signal.\n\
PID is an integer; if negative it identifies a process group.\n\
"), stdout);
printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
emit_ancillary_info (PROGRAM_NAME);
}
exit (status);
}
/* Print a row of 'kill -t' output. NUM_WIDTH is the maximum signal
number width, and SIGNUM is the signal number to print. The
maximum name width is NAME_WIDTH, and SIGNAME is the name to print. */
static void
print_table_row (int num_width, int signum,
int name_width, char const *signame)
{
char const *description = strsignal (signum);
printf ("%*d %-*s %s\n", num_width, signum, name_width, signame,
description ? description : "?");
}
/* Print a list of signal names. If TABLE, print a table.
Print the names specified by ARGV if nonzero; otherwise,
print all known names. Return a suitable exit status. */
static int
list_signals (bool table, char *const *argv)
{
int signum;
int status = EXIT_SUCCESS;
char signame[SIG2STR_MAX];
if (table)
{
unsigned int name_width = 0;
/* Compute the maximum width of a signal number. */
unsigned int num_width = 1;
for (signum = 1; signum <= SIGNUM_BOUND / 10; signum *= 10)
num_width++;
/* Compute the maximum width of a signal name. */
for (signum = 1; signum <= SIGNUM_BOUND; signum++)
if (sig2str (signum, signame) == 0)
{
size_t len = strlen (signame);
if (name_width < len)
name_width = len;
}
if (argv)
for (; *argv; argv++)
{
signum = operand2sig (*argv, signame);
if (signum < 0)
status = EXIT_FAILURE;
else
print_table_row (num_width, signum, name_width, signame);
}
else
for (signum = 1; signum <= SIGNUM_BOUND; signum++)
if (sig2str (signum, signame) == 0)
print_table_row (num_width, signum, name_width, signame);
}
else
{
if (argv)
for (; *argv; argv++)
{
signum = operand2sig (*argv, signame);
if (signum < 0)
status = EXIT_FAILURE;
else
{
if (ISDIGIT (**argv))
puts (signame);
else
printf ("%d\n", signum);
}
}
else
for (signum = 1; signum <= SIGNUM_BOUND; signum++)
if (sig2str (signum, signame) == 0)
puts (signame);
}
return status;
}
/* Send signal SIGNUM to all the processes or process groups specified
by ARGV. Return a suitable exit status. */
static int
send_signals (int signum, char *const *argv)
{
int status = EXIT_SUCCESS;
char const *arg = *argv;
do
{
char *endp;
intmax_t n = (errno = 0, strtoimax (arg, &endp, 10));
pid_t pid = n;
if (errno == ERANGE || pid != n || arg == endp || *endp)
{
error (0, 0, _("%s: invalid process id"), quote (arg));
status = EXIT_FAILURE;
}
else if (kill (pid, signum) != 0)
{
error (0, errno, "%s", quote (arg));
status = EXIT_FAILURE;
}
}
while ((arg = *++argv));
return status;
}
int
main (int argc, char **argv)
{
int optc;
bool list = false;
bool table = false;
int signum = -1;
char signame[SIG2STR_MAX];
initialize_main (&argc, &argv);
set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
while ((optc = getopt_long (argc, argv, short_options, long_options, NULL))
!= -1)
switch (optc)
{
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (optind != 2)
{
/* This option is actually a process-id. */
optind--;
goto no_more_options;
}
FALLTHROUGH;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': /*case 'L':*/ case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z':
if (! optarg)
optarg = argv[optind - 1] + strlen (argv[optind - 1]);
if (optarg != argv[optind - 1] + 2)
{
error (0, 0, _("invalid option -- %c"), optc);
usage (EXIT_FAILURE);
}
optarg--;
FALLTHROUGH;
case 'n': /* -n is not documented, but is for Bash compatibility. */
case 's':
if (0 <= signum)
{
error (0, 0, _("%s: multiple signals specified"), quote (optarg));
usage (EXIT_FAILURE);
}
signum = operand2sig (optarg, signame);
if (signum < 0)
usage (EXIT_FAILURE);
break;
case 'L': /* -L is not documented, but is for procps compatibility. */
case 't':
table = true;
FALLTHROUGH;
case 'l':
if (list)
{
error (0, 0, _("multiple -l or -t options specified"));
usage (EXIT_FAILURE);
}
list = true;
break;
case_GETOPT_HELP_CHAR;
case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
default:
usage (EXIT_FAILURE);
}
no_more_options:
if (signum < 0)
signum = SIGTERM;
else if (list)
{
error (0, 0, _("cannot combine signal with -l or -t"));
usage (EXIT_FAILURE);
}
if ( ! list && argc <= optind)
{
error (0, 0, _("no process ID specified"));
usage (EXIT_FAILURE);
}
return (list
? list_signals (table, optind < argc ? argv + optind : NULL)
: send_signals (signum, argv + optind));
}