1 /* kill -- send a signal to a process
2 Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by Paul Eggert. */
23 #include <sys/types.h>
27 # include <sys/wait.h>
30 # define WIFSIGNALED(s) (((s) & 0xFFFF) - 1 < (unsigned int) 0xFF)
33 # define WTERMSIG(s) ((s) & 0x7F)
40 /* The official name of this program (e.g., no `g' prefix). */
41 #define PROGRAM_NAME "kill"
43 #define AUTHORS "Paul Eggert"
45 #if ! (HAVE_DECL_STRTOIMAX || defined strtoimax)
46 intmax_t strtoimax ();
49 #if ! (HAVE_DECL_STRSIGNAL || defined strsignal)
50 # if ! (HAVE_DECL_SYS_SIGLIST || defined sys_siglist)
51 # if HAVE_DECL__SYS_SIGLIST || defined _sys_siglist
52 # define sys_siglist _sys_siglist
53 # elif HAVE_DECL___SYS_SIGLIST || defined __sys_siglist
54 # define sys_siglist __sys_siglist
57 # if HAVE_DECL_SYS_SIGLIST || defined sys_siglist
58 # define strsignal(signum) (0 <= (signum) && (signum) <= SIGNUM_BOUND \
59 ? sys_siglist[signum] \
63 # define strsignal(signum) 0
67 /* The name this program was run with, for error messages. */
70 static char const short_options[] =
71 "0::1::2::3::4::5::6::7::8::9::"
72 "A::B::C::D::E::F::G::H::I::J::K::L::M::"
73 "N::O::P::Q::R::S::T::U::V::W::X::Y::Z::"
76 static struct option const long_options[] =
78 {"list", no_argument, NULL, 'l'},
79 {"signal", required_argument, NULL, 's'},
80 {"table", no_argument, NULL, 't'},
81 {GETOPT_HELP_OPTION_DECL},
82 {GETOPT_VERSION_OPTION_DECL},
89 if (status != EXIT_SUCCESS)
90 fprintf (stderr, _("Try `%s --help' for more information.\n"),
95 Usage: %s [-s SIGNAL | -SIGNAL] PID...\n\
96 or: %s -l [SIGNAL]...\n\
97 or: %s -t [SIGNAL]...\n\
99 program_name, program_name, program_name);
101 Send signals to processes, or list signals.\n\
105 Mandatory arguments to long options are mandatory for short options too.\n\
108 -s, --signal=SIGNAL, -SIGNAL\n\
109 specify the name or number of the signal to be sent\n\
110 -l, --list list signal names, or convert signal names to/from numbers\n\
111 -t, --table print a table of signal information\n\
113 fputs (HELP_OPTION_DESCRIPTION, stdout);
114 fputs (VERSION_OPTION_DESCRIPTION, stdout);
116 SIGNAL may be a signal name like `HUP', or a signal number like `1',\n\
117 or an exit status of a process terminated by a signal.\n\
118 PID is an integer; if negative it identifies a process group.\n\
120 printf (USAGE_BUILTIN_WARNING, PROGRAM_NAME);
121 printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
126 /* Convert OPERAND to a signal number with printable representation SIGNAME.
127 Return the signal number, or -1 if unsuccessful. */
130 operand2sig (char const *operand, char *signame)
134 if (ISDIGIT (*operand))
137 long int l = (errno = 0, strtol (operand, &endp, 10));
139 signum = (operand == endp || *endp || errno || i != l ? -1
140 : WIFSIGNALED (i) ? WTERMSIG (i)
145 /* Convert signal to upper case in the C locale, not in the
146 current locale. Don't assume ASCII; it might be EBCDIC. */
147 char *upcased = xstrdup (operand);
149 for (p = upcased; *p; p++)
150 if (strchr ("abcdefghijklmnopqrstuvwxyz", *p))
153 /* Look for the signal name, possibly prefixed by "SIG",
154 and possibly lowercased. */
155 if (! (str2sig (upcased, &signum) == 0
156 || (upcased[0] == 'S' && upcased[1] == 'I' && upcased[2] == 'G'
157 && str2sig (upcased + 3, &signum) == 0)))
163 if (signum < 0 || sig2str (signum, signame) != 0)
165 error (0, 0, _("%s: invalid signal"), operand);
172 /* Print a row of `kill -t' output. NUM_WIDTH is the maximum signal
173 number width, and SIGNUM is the signal number to print. The
174 maximum name width is NAME_WIDTH, and SIGNAME is the name to print. */
177 print_table_row (unsigned int num_width, int signum,
178 unsigned int name_width, char const *signame)
180 char const *description = strsignal (signum);
181 printf ("%*d %-*s %s\n", num_width, signum, name_width, signame,
182 description ? description : "?");
185 /* Print a list of signal names. If TABLE, print a table.
186 Print the names specified by ARGV if nonzero; otherwise,
187 print all known names. Return a suitable exit status. */
190 list_signals (bool table, char *const *argv)
193 int status = EXIT_SUCCESS;
194 char signame[SIG2STR_MAX];
198 unsigned int name_width = 0;
200 /* Compute the maximum width of a signal number. */
201 unsigned int num_width = 1;
202 for (signum = 1; signum <= SIGNUM_BOUND / 10; signum *= 10)
205 /* Compute the maximum width of a signal name. */
206 for (signum = 1; signum <= SIGNUM_BOUND; signum++)
207 if (sig2str (signum, signame) == 0)
209 size_t len = strlen (signame);
210 if (name_width < len)
215 for (; *argv; argv++)
217 signum = operand2sig (*argv, signame);
219 status = EXIT_FAILURE;
221 print_table_row (num_width, signum, name_width, signame);
224 for (signum = 1; signum <= SIGNUM_BOUND; signum++)
225 if (sig2str (signum, signame) == 0)
226 print_table_row (num_width, signum, name_width, signame);
231 for (; *argv; argv++)
233 signum = operand2sig (*argv, signame);
235 status = EXIT_FAILURE;
238 if (ISDIGIT (**argv))
241 printf ("%d\n", signum);
245 for (signum = 1; signum <= SIGNUM_BOUND; signum++)
246 if (sig2str (signum, signame) == 0)
253 /* Send signal SIGNUM to all the processes or process groups specified
254 by ARGV. Return a suitable exit status. */
257 send_signals (int signum, char *const *argv)
259 int status = EXIT_SUCCESS;
260 char const *arg = *argv;
265 intmax_t n = (errno = 0, strtoimax (arg, &endp, 10));
268 if (errno == ERANGE || pid != n || arg == endp || *endp)
270 error (0, 0, _("%s: invalid process id"), arg);
271 status = EXIT_FAILURE;
273 else if (kill (pid, signum) != 0)
275 error (0, errno, "%s", arg);
276 status = EXIT_FAILURE;
279 while ((arg = *++argv));
285 main (int argc, char **argv)
291 char signame[SIG2STR_MAX];
293 initialize_main (&argc, &argv);
294 program_name = argv[0];
295 setlocale (LC_ALL, "");
296 bindtextdomain (PACKAGE, LOCALEDIR);
297 textdomain (PACKAGE);
299 atexit (close_stdout);
301 while ((optc = getopt_long (argc, argv, short_options, long_options, NULL))
305 case '0': case '1': case '2': case '3': case '4':
306 case '5': case '6': case '7': case '8': case '9':
309 /* This option is actually a process-id. */
311 goto no_more_options;
314 case 'A': case 'B': case 'C': case 'D': case 'E':
315 case 'F': case 'G': case 'H': case 'I': case 'J':
316 case 'K': case 'L': case 'M': case 'N': case 'O':
317 case 'P': case 'Q': case 'R': case 'S': case 'T':
318 case 'U': case 'V': case 'W': case 'X': case 'Y':
321 optarg = argv[optind - 1] + strlen (argv[optind - 1]);
322 if (optarg != argv[optind - 1] + 2)
324 error (0, 0, _("invalid option -- %c"), optc);
325 usage (EXIT_FAILURE);
329 case 'n': /* -n is not documented, but is for Bash compatibility. */
333 error (0, 0, _("%s: multiple signals specified"), optarg);
334 usage (EXIT_FAILURE);
336 signum = operand2sig (optarg, signame);
338 usage (EXIT_FAILURE);
347 error (0, 0, _("multiple -l or -t options specified"));
348 usage (EXIT_FAILURE);
353 case_GETOPT_HELP_CHAR;
354 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
356 usage (EXIT_FAILURE);
364 error (0, 0, _("cannot combine signal with -l or -t"));
365 usage (EXIT_FAILURE);
368 if ( ! list && argc <= optind)
370 error (0, 0, _("no process ID specified"));
371 usage (EXIT_FAILURE);
375 ? list_signals (table, optind < argc ? argv + optind : NULL)
376 : send_signals (signum, argv + optind));