| /* |
| * 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 MiĆkiewicz <misiek@pld.ORG.PL> |
| * - added Native Language Support |
| * |
| * 1999-11-13 aeb Accept signal numbers 128+s. |
| * |
| * Copyright (C) 2014 Sami Kerola <kerolasa@iki.fi> |
| * Copyright (C) 2014 Karel Zak <kzak@redhat.com> |
| */ |
| |
| #include <ctype.h> /* for isdigit() */ |
| #include <signal.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "c.h" |
| #include "closestream.h" |
| #include "nls.h" |
| #include "pidfd-utils.h" |
| #include "procutils.h" |
| #include "signames.h" |
| #include "strutils.h" |
| #include "ttyutils.h" |
| #include "xalloc.h" |
| |
| /* partial success, otherwise we return regular EXIT_{SUCCESS,FAILURE} */ |
| #define KILL_EXIT_SOMEOK 64 |
| |
| enum { |
| KILL_FIELD_WIDTH = 11, |
| KILL_OUTPUT_WIDTH = 72 |
| }; |
| |
| #ifdef UL_HAVE_PIDFD |
| # include <poll.h> |
| # include "list.h" |
| struct timeouts { |
| int period; |
| int sig; |
| struct list_head follow_ups; |
| }; |
| #endif |
| |
| struct kill_control { |
| char *arg; |
| pid_t pid; |
| int numsig; |
| #ifdef HAVE_SIGQUEUE |
| union sigval sigdata; |
| #endif |
| #ifdef UL_HAVE_PIDFD |
| struct list_head follow_ups; |
| #endif |
| unsigned int |
| check_all:1, |
| do_kill:1, |
| do_pid:1, |
| use_sigval:1, |
| #ifdef UL_HAVE_PIDFD |
| timeout:1, |
| #endif |
| verbose:1; |
| }; |
| |
| static void print_signal_name(int signum) |
| { |
| const char *name = signum_to_signame(signum); |
| |
| if (name) { |
| printf("%s\n", name); |
| return; |
| } |
| #ifdef SIGRTMIN |
| if (SIGRTMIN <= signum && signum <= SIGRTMAX) { |
| printf("RT%d\n", signum - SIGRTMIN); |
| return; |
| } |
| #endif |
| printf("%d\n", signum); |
| } |
| |
| static void pretty_print_signal(FILE *fp, size_t term_width, size_t *lpos, |
| int signum, const char *name) |
| { |
| if (term_width < (*lpos + KILL_FIELD_WIDTH)) { |
| fputc('\n', fp); |
| *lpos = 0; |
| } |
| *lpos += KILL_FIELD_WIDTH; |
| fprintf(fp, "%2d %-8s", signum, name); |
| } |
| |
| static void print_all_signals(FILE *fp, int pretty) |
| { |
| size_t n, lth, lpos = 0, width; |
| const char *signame = NULL; |
| int signum = 0; |
| |
| if (!pretty) { |
| for (n = 0; get_signame_by_idx(n, &signame, NULL) == 0; n++) { |
| lth = 1 + strlen(signame); |
| if (KILL_OUTPUT_WIDTH < lpos + lth) { |
| fputc('\n', fp); |
| lpos = 0; |
| } else if (lpos) |
| fputc(' ', fp); |
| lpos += lth; |
| fputs(signame, fp); |
| } |
| #ifdef SIGRTMIN |
| fputs(" RT<N> RTMIN+<N> RTMAX-<N>", fp); |
| #endif |
| fputc('\n', fp); |
| return; |
| } |
| |
| /* pretty print */ |
| width = get_terminal_width(KILL_OUTPUT_WIDTH + 1) - 1; |
| for (n = 0; get_signame_by_idx(n, &signame, &signum) == 0; n++) |
| pretty_print_signal(fp, width, &lpos, signum, signame); |
| #ifdef SIGRTMIN |
| pretty_print_signal(fp, width, &lpos, SIGRTMIN, "RTMIN"); |
| pretty_print_signal(fp, width, &lpos, SIGRTMAX, "RTMAX"); |
| #endif |
| fputc('\n', fp); |
| } |
| |
| static void err_nosig(char *name) |
| { |
| warnx(_("unknown signal %s; valid signals:"), name); |
| print_all_signals(stderr, 1); |
| exit(EXIT_FAILURE); |
| } |
| |
| static int arg_to_signum(char *arg, int maskbit) |
| { |
| int numsig; |
| char *ep; |
| |
| if (isdigit(*arg)) { |
| numsig = strtol(arg, &ep, 10); |
| if (NSIG <= numsig && maskbit && (numsig & 128) != 0) |
| numsig -= 128; |
| if (*ep != 0 || numsig < 0 || NSIG <= numsig) |
| return -1; |
| return numsig; |
| } |
| return signame_to_signum(arg); |
| } |
| |
| static void __attribute__((__noreturn__)) usage(void) |
| { |
| FILE *out = stdout; |
| fputs(USAGE_HEADER, out); |
| fprintf(out, _(" %s [options] <pid>|<name>...\n"), program_invocation_short_name); |
| |
| fputs(USAGE_SEPARATOR, out); |
| fputs(_("Forcibly terminate a process.\n"), out); |
| |
| 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 <signal> send this <signal> instead of SIGTERM\n"), out); |
| #ifdef HAVE_SIGQUEUE |
| fputs(_(" -q, --queue <value> use sigqueue(2), not kill(2), and pass <value> as data\n"), out); |
| #endif |
| #ifdef UL_HAVE_PIDFD |
| fputs(_(" --timeout <milliseconds> <follow-up signal>\n" |
| " wait up to timeout and send follow-up signal\n"), out); |
| #endif |
| fputs(_(" -p, --pid print pids without signaling them\n"), out); |
| fputs(_(" -l, --list[=<signal>] list signal names, or convert a signal number to a name\n"), out); |
| fputs(_(" -L, --table list signal names and numbers\n"), out); |
| fputs(_(" --verbose print pids that will be signaled\n"), out); |
| |
| fputs(USAGE_SEPARATOR, out); |
| printf(USAGE_HELP_OPTIONS(24)); |
| printf(USAGE_MAN_TAIL("kill(1)")); |
| |
| exit(EXIT_SUCCESS); |
| } |
| |
| static void __attribute__((__noreturn__)) print_kill_version(void) |
| { |
| static const char *features[] = { |
| #ifdef HAVE_SIGQUEUE |
| "sigqueue", |
| #endif |
| #ifdef UL_HAVE_PIDFD |
| "pidfd", |
| #endif |
| }; |
| |
| printf(_("%s from %s"), program_invocation_short_name, PACKAGE_STRING); |
| |
| if (ARRAY_SIZE(features)) { |
| size_t i; |
| fputs(_(" (with: "), stdout); |
| for (i = 0; i < ARRAY_SIZE(features); i++) { |
| fputs(features[i], stdout); |
| if (i + 1 < ARRAY_SIZE(features)) |
| fputs(", ", stdout); |
| } |
| fputs(")\n", stdout); |
| } |
| exit(EXIT_SUCCESS); |
| } |
| |
| static char **parse_arguments(int argc, char **argv, struct kill_control *ctl) |
| { |
| char *arg; |
| |
| /* Loop through the arguments. Actually, -a is the only option |
| * can be used with other options. The 'kill' is basically a |
| * one-option-at-most program. */ |
| for (argc--, argv++; 0 < argc; argc--, argv++) { |
| arg = *argv; |
| if (*arg != '-') |
| break; |
| if (!strcmp(arg, "--")) { |
| argc--, argv++; |
| break; |
| } |
| if (!strcmp(arg, "-v") || !strcmp(arg, "-V") || |
| !strcmp(arg, "--version")) |
| print_kill_version(); |
| if (!strcmp(arg, "-h") || !strcmp(arg, "--help")) |
| usage(); |
| if (!strcmp(arg, "--verbose")) { |
| ctl->verbose = 1; |
| continue; |
| } |
| if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) { |
| ctl->check_all = 1; |
| continue; |
| } |
| if (!strcmp(arg, "-l") || !strcmp(arg, "--list")) { |
| if (argc < 2) { |
| print_all_signals(stdout, 0); |
| exit(EXIT_SUCCESS); |
| } |
| if (2 < argc) |
| errx(EXIT_FAILURE, _("too many arguments")); |
| /* argc == 2, accept "kill -l $?" */ |
| arg = argv[1]; |
| if ((ctl->numsig = arg_to_signum(arg, 1)) < 0) |
| errx(EXIT_FAILURE, _("unknown signal: %s"), |
| arg); |
| print_signal_name(ctl->numsig); |
| exit(EXIT_SUCCESS); |
| } |
| /* for compatibility with procps kill(1) */ |
| if (!strncmp(arg, "--list=", 7) || !strncmp(arg, "-l=", 3)) { |
| char *p = strchr(arg, '=') + 1; |
| if ((ctl->numsig = arg_to_signum(p, 1)) < 0) |
| errx(EXIT_FAILURE, _("unknown signal: %s"), p); |
| print_signal_name(ctl->numsig); |
| exit(EXIT_SUCCESS); |
| } |
| if (!strcmp(arg, "-L") || !strcmp(arg, "--table")) { |
| print_all_signals(stdout, 1); |
| exit(EXIT_SUCCESS); |
| } |
| if (!strcmp(arg, "-p") || !strcmp(arg, "--pid")) { |
| ctl->do_pid = 1; |
| if (ctl->do_kill) |
| errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--signal"); |
| #ifdef HAVE_SIGQUEUE |
| if (ctl->use_sigval) |
| errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--queue"); |
| #endif |
| continue; |
| } |
| if (!strcmp(arg, "-s") || !strcmp(arg, "--signal")) { |
| if (argc < 2) |
| errx(EXIT_FAILURE, _("not enough arguments")); |
| ctl->do_kill = 1; |
| if (ctl->do_pid) |
| errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--signal"); |
| argc--, argv++; |
| arg = *argv; |
| if ((ctl->numsig = arg_to_signum(arg, 0)) < 0) |
| err_nosig(arg); |
| continue; |
| } |
| #ifdef HAVE_SIGQUEUE |
| if (!strcmp(arg, "-q") || !strcmp(arg, "--queue")) { |
| if (argc < 2) |
| errx(EXIT_FAILURE, _("option '%s' requires an argument"), arg); |
| if (ctl->do_pid) |
| errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--queue"); |
| argc--, argv++; |
| arg = *argv; |
| ctl->sigdata.sival_int = strtos32_or_err(arg, _("argument error")); |
| ctl->use_sigval = 1; |
| continue; |
| } |
| #endif |
| #ifdef UL_HAVE_PIDFD |
| if (!strcmp(arg, "--timeout")) { |
| struct timeouts *next; |
| |
| ctl->timeout = 1; |
| if (argc < 2) |
| errx(EXIT_FAILURE, _("option '%s' requires an argument"), arg); |
| argc--, argv++; |
| arg = *argv; |
| next = xcalloc(1, sizeof(*next)); |
| next->period = strtos32_or_err(arg, _("argument error")); |
| INIT_LIST_HEAD(&next->follow_ups); |
| argc--, argv++; |
| arg = *argv; |
| if ((next->sig = arg_to_signum(arg, 0)) < 0) |
| err_nosig(arg); |
| list_add_tail(&next->follow_ups, &ctl->follow_ups); |
| continue; |
| } |
| #endif |
| /* '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 either signal n or pid -n (a process group |
| * number). In case of doubt, POSIX tells us to assume a |
| * signal. But if a signal has already been parsed, then |
| * assume it is a process group, so stop parsing options. */ |
| if (ctl->do_kill) |
| break; |
| arg++; |
| if ((ctl->numsig = arg_to_signum(arg, 0)) < 0) |
| errx(EXIT_FAILURE, _("invalid signal name or number: %s"), arg); |
| ctl->do_kill = 1; |
| if (ctl->do_pid) |
| errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--signal"); |
| } |
| if (!*argv) |
| errx(EXIT_FAILURE, _("not enough arguments")); |
| return argv; |
| } |
| |
| #ifdef UL_HAVE_PIDFD |
| static int kill_with_timeout(const struct kill_control *ctl) |
| { |
| int pfd, n; |
| struct pollfd p = { 0 }; |
| siginfo_t info = { 0 }; |
| struct list_head *entry; |
| |
| info.si_code = SI_QUEUE; |
| info.si_signo = ctl->numsig; |
| info.si_uid = getuid(); |
| info.si_pid = getpid(); |
| info.si_value.sival_int = |
| ctl->use_sigval != 0 ? ctl->use_sigval : ctl->numsig; |
| |
| if ((pfd = pidfd_open(ctl->pid, 0)) < 0) |
| err(EXIT_FAILURE, _("pidfd_open() failed: %d"), ctl->pid); |
| p.fd = pfd; |
| p.events = POLLIN; |
| |
| if (pidfd_send_signal(pfd, ctl->numsig, &info, 0) < 0) |
| err(EXIT_FAILURE, _("pidfd_send_signal() failed")); |
| list_for_each(entry, &ctl->follow_ups) { |
| struct timeouts *timeout; |
| |
| timeout = list_entry(entry, struct timeouts, follow_ups); |
| n = poll(&p, 1, timeout->period); |
| if (n < 0) |
| err(EXIT_FAILURE, _("poll() failed")); |
| if (n == 0) { |
| info.si_signo = timeout->sig; |
| if (ctl->verbose) |
| printf(_("timeout, sending signal %d to pid %d\n"), |
| timeout->sig, ctl->pid); |
| if (pidfd_send_signal(pfd, timeout->sig, &info, 0) < 0) |
| err(EXIT_FAILURE, _("pidfd_send_signal() failed")); |
| } |
| } |
| return 0; |
| } |
| #endif |
| |
| static int kill_verbose(const struct kill_control *ctl) |
| { |
| int rc = 0; |
| |
| if (ctl->verbose) |
| printf(_("sending signal %d to pid %d\n"), ctl->numsig, ctl->pid); |
| if (ctl->do_pid) { |
| printf("%ld\n", (long) ctl->pid); |
| return 0; |
| } |
| #ifdef UL_HAVE_PIDFD |
| if (ctl->timeout) { |
| rc = kill_with_timeout(ctl); |
| } else |
| #endif |
| #ifdef HAVE_SIGQUEUE |
| if (ctl->use_sigval) |
| rc = sigqueue(ctl->pid, ctl->numsig, ctl->sigdata); |
| else |
| #endif |
| rc = kill(ctl->pid, ctl->numsig); |
| |
| if (rc < 0) |
| warn(_("sending signal to %s failed"), ctl->arg); |
| return rc; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| struct kill_control ctl = { .numsig = SIGTERM }; |
| int nerrs = 0, ct = 0; |
| |
| setlocale(LC_ALL, ""); |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| close_stdout_atexit(); |
| |
| #ifdef UL_HAVE_PIDFD |
| INIT_LIST_HEAD(&ctl.follow_ups); |
| #endif |
| argv = parse_arguments(argc, argv, &ctl); |
| |
| /* The rest of the arguments should be process ids and names. */ |
| for ( ; (ctl.arg = *argv) != NULL; argv++) { |
| char *ep = NULL; |
| |
| errno = 0; |
| ctl.pid = strtol(ctl.arg, &ep, 10); |
| if (errno == 0 && ep && *ep == '\0' && ctl.arg < ep) { |
| if (kill_verbose(&ctl) != 0) |
| nerrs++; |
| ct++; |
| } else { |
| struct proc_processes *ps = proc_open_processes(); |
| int found = 0; |
| |
| if (!ps) |
| continue; |
| if (!ctl.check_all) |
| proc_processes_filter_by_uid(ps, getuid()); |
| |
| proc_processes_filter_by_name(ps, ctl.arg); |
| while (proc_next_pid(ps, &ctl.pid) == 0) { |
| if (kill_verbose(&ctl) != 0) |
| nerrs++; |
| ct++; |
| found = 1; |
| } |
| proc_close_processes(ps); |
| |
| if (!found) { |
| nerrs++, ct++; |
| warnx(_("cannot find process \"%s\""), ctl.arg); |
| } |
| } |
| } |
| |
| #ifdef UL_HAVE_PIDFD |
| while (!list_empty(&ctl.follow_ups)) { |
| struct timeouts *x = list_entry(ctl.follow_ups.next, |
| struct timeouts, follow_ups); |
| list_del(&x->follow_ups); |
| free(x); |
| } |
| #endif |
| if (ct && nerrs == 0) |
| return EXIT_SUCCESS; /* full success */ |
| if (ct == nerrs) |
| return EXIT_FAILURE; /* all failed */ |
| |
| return KILL_EXIT_SOMEOK; /* partial success */ |
| } |
| |