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-rw-r--r--misc-utils/kill.c560
1 files changed, 560 insertions, 0 deletions
diff --git a/misc-utils/kill.c b/misc-utils/kill.c
new file mode 100644
index 0000000..c469074
--- /dev/null
+++ b/misc-utils/kill.c
@@ -0,0 +1,560 @@
+/*
+ * 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 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 "procfs.h"
+#include "pathnames.h"
+#include "signames.h"
+#include "strutils.h"
+#include "ttyutils.h"
+#include "xalloc.h"
+#include "fileutils.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,
+ require_handler: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)) {
+ errno = 0;
+ numsig = strtol(arg, &ep, 10);
+ if (NSIG <= numsig && maskbit && (numsig & 128) != 0)
+ numsig -= 128;
+ if (errno || *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(_(" -r, --require-handler do not send signal if signal handler is not present\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, "-r") || !strcmp(arg, "--require-handler")) {
+ ctl->require_handler = 1;
+ continue;
+ }
+ 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;
+}
+
+static int check_signal_handler(const struct kill_control *ctl)
+{
+ uintmax_t sigcgt = 0;
+ int rc = 0, has_hnd = 0;
+ struct path_cxt *pc;
+
+ if (!ctl->require_handler)
+ return 1;
+
+ pc = ul_new_procfs_path(ctl->pid, NULL);
+ if (!pc)
+ return -ENOMEM;
+
+ rc = procfs_process_get_stat_nth(pc, 34, &sigcgt);
+ if (rc)
+ return -EINVAL;
+
+ ul_unref_path(pc);
+
+ has_hnd = ((1UL << (ctl->numsig - 1)) & sigcgt) != 0;
+ if (ctl->verbose && !has_hnd)
+ printf(_("not signalling pid %d, it has no userspace handler for signal %d\n"), ctl->pid, ctl->numsig);
+
+ return has_hnd;
+}
+
+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 (check_signal_handler(&ctl) <= 0)
+ continue;
+ if (kill_verbose(&ctl) != 0)
+ nerrs++;
+ ct++;
+ } else {
+ int found = 0;
+ struct dirent *d;
+ DIR *dir = opendir(_PATH_PROC);
+ uid_t uid = !ctl.check_all ? getuid() : 0;
+
+ if (!dir)
+ continue;
+
+ while ((d = xreaddir(dir))) {
+ if (!ctl.check_all &&
+ !procfs_dirent_match_uid(dir, d, uid))
+ continue;
+ if (ctl.arg &&
+ !procfs_dirent_match_name(dir, d, ctl.arg))
+ continue;
+ if (procfs_dirent_get_pid(d, &ctl.pid) != 0)
+ continue;
+ if (check_signal_handler(&ctl) <= 0)
+ continue;
+
+ if (kill_verbose(&ctl) != 0)
+ nerrs++;
+ ct++;
+ found = 1;
+ }
+
+ closedir(dir);
+ 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 */
+}
+
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