Adding upstream version 2.39.3.upstream/2.39.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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 */
+}
+