514 lines
14 KiB
C
514 lines
14 KiB
C
/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* oct 5 1994 -- almost entirely re-written to allow for process names.
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* modifications (c) salvatore valente <svalente@mit.edu>
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* may be used / modified / distributed under the same terms as the original.
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*
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* 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
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* - added Native Language Support
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*
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* 1999-11-13 aeb Accept signal numbers 128+s.
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*
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* Copyright (C) 2014 Sami Kerola <kerolasa@iki.fi>
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* Copyright (C) 2014 Karel Zak <kzak@redhat.com>
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*/
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#include <ctype.h> /* for isdigit() */
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "c.h"
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#include "closestream.h"
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#include "nls.h"
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#include "pidfd-utils.h"
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#include "procutils.h"
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#include "signames.h"
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#include "strutils.h"
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#include "ttyutils.h"
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#include "xalloc.h"
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/* partial success, otherwise we return regular EXIT_{SUCCESS,FAILURE} */
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#define KILL_EXIT_SOMEOK 64
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enum {
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KILL_FIELD_WIDTH = 11,
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KILL_OUTPUT_WIDTH = 72
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};
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#ifdef UL_HAVE_PIDFD
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# include <poll.h>
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# include "list.h"
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struct timeouts {
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int period;
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int sig;
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struct list_head follow_ups;
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};
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#endif
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struct kill_control {
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char *arg;
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pid_t pid;
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int numsig;
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#ifdef HAVE_SIGQUEUE
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union sigval sigdata;
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#endif
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#ifdef UL_HAVE_PIDFD
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struct list_head follow_ups;
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#endif
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unsigned int
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check_all:1,
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do_kill:1,
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do_pid:1,
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use_sigval:1,
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#ifdef UL_HAVE_PIDFD
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timeout:1,
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#endif
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verbose:1;
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};
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static void print_signal_name(int signum)
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{
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const char *name = signum_to_signame(signum);
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if (name) {
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printf("%s\n", name);
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return;
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}
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#ifdef SIGRTMIN
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if (SIGRTMIN <= signum && signum <= SIGRTMAX) {
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printf("RT%d\n", signum - SIGRTMIN);
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return;
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}
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#endif
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printf("%d\n", signum);
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}
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static void pretty_print_signal(FILE *fp, size_t term_width, size_t *lpos,
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int signum, const char *name)
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{
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if (term_width < (*lpos + KILL_FIELD_WIDTH)) {
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fputc('\n', fp);
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*lpos = 0;
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}
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*lpos += KILL_FIELD_WIDTH;
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fprintf(fp, "%2d %-8s", signum, name);
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}
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static void print_all_signals(FILE *fp, int pretty)
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{
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size_t n, lth, lpos = 0, width;
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const char *signame = NULL;
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int signum = 0;
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if (!pretty) {
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for (n = 0; get_signame_by_idx(n, &signame, NULL) == 0; n++) {
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lth = 1 + strlen(signame);
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if (KILL_OUTPUT_WIDTH < lpos + lth) {
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fputc('\n', fp);
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lpos = 0;
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} else if (lpos)
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fputc(' ', fp);
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lpos += lth;
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fputs(signame, fp);
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}
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#ifdef SIGRTMIN
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fputs(" RT<N> RTMIN+<N> RTMAX-<N>", fp);
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#endif
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fputc('\n', fp);
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return;
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}
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/* pretty print */
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width = get_terminal_width(KILL_OUTPUT_WIDTH + 1) - 1;
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for (n = 0; get_signame_by_idx(n, &signame, &signum) == 0; n++)
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pretty_print_signal(fp, width, &lpos, signum, signame);
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#ifdef SIGRTMIN
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pretty_print_signal(fp, width, &lpos, SIGRTMIN, "RTMIN");
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pretty_print_signal(fp, width, &lpos, SIGRTMAX, "RTMAX");
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#endif
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fputc('\n', fp);
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}
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static void err_nosig(char *name)
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{
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warnx(_("unknown signal %s; valid signals:"), name);
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print_all_signals(stderr, 1);
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exit(EXIT_FAILURE);
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}
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static int arg_to_signum(char *arg, int maskbit)
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{
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int numsig;
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char *ep;
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if (isdigit(*arg)) {
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numsig = strtol(arg, &ep, 10);
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if (NSIG <= numsig && maskbit && (numsig & 128) != 0)
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numsig -= 128;
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if (*ep != 0 || numsig < 0 || NSIG <= numsig)
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return -1;
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return numsig;
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}
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return signame_to_signum(arg);
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}
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static void __attribute__((__noreturn__)) usage(void)
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{
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FILE *out = stdout;
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fputs(USAGE_HEADER, out);
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fprintf(out, _(" %s [options] <pid>|<name>...\n"), program_invocation_short_name);
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fputs(USAGE_SEPARATOR, out);
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fputs(_("Forcibly terminate a process.\n"), out);
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fputs(USAGE_OPTIONS, out);
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fputs(_(" -a, --all do not restrict the name-to-pid conversion to processes\n"
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" with the same uid as the present process\n"), out);
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fputs(_(" -s, --signal <signal> send this <signal> instead of SIGTERM\n"), out);
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#ifdef HAVE_SIGQUEUE
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fputs(_(" -q, --queue <value> use sigqueue(2), not kill(2), and pass <value> as data\n"), out);
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#endif
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#ifdef UL_HAVE_PIDFD
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fputs(_(" --timeout <milliseconds> <follow-up signal>\n"
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" wait up to timeout and send follow-up signal\n"), out);
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#endif
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fputs(_(" -p, --pid print pids without signaling them\n"), out);
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fputs(_(" -l, --list[=<signal>] list signal names, or convert a signal number to a name\n"), out);
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fputs(_(" -L, --table list signal names and numbers\n"), out);
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fputs(_(" --verbose print pids that will be signaled\n"), out);
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fputs(USAGE_SEPARATOR, out);
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printf(USAGE_HELP_OPTIONS(24));
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printf(USAGE_MAN_TAIL("kill(1)"));
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exit(EXIT_SUCCESS);
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}
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static void __attribute__((__noreturn__)) print_kill_version(void)
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{
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static const char *features[] = {
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#ifdef HAVE_SIGQUEUE
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"sigqueue",
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#endif
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#ifdef UL_HAVE_PIDFD
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"pidfd",
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#endif
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};
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printf(_("%s from %s"), program_invocation_short_name, PACKAGE_STRING);
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if (ARRAY_SIZE(features)) {
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size_t i;
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fputs(_(" (with: "), stdout);
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for (i = 0; i < ARRAY_SIZE(features); i++) {
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fputs(features[i], stdout);
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if (i + 1 < ARRAY_SIZE(features))
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fputs(", ", stdout);
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}
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fputs(")\n", stdout);
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}
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exit(EXIT_SUCCESS);
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}
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static char **parse_arguments(int argc, char **argv, struct kill_control *ctl)
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{
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char *arg;
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/* Loop through the arguments. Actually, -a is the only option
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* can be used with other options. The 'kill' is basically a
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* one-option-at-most program. */
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for (argc--, argv++; 0 < argc; argc--, argv++) {
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arg = *argv;
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if (*arg != '-')
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break;
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if (!strcmp(arg, "--")) {
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argc--, argv++;
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break;
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}
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if (!strcmp(arg, "-v") || !strcmp(arg, "-V") ||
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!strcmp(arg, "--version"))
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print_kill_version();
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if (!strcmp(arg, "-h") || !strcmp(arg, "--help"))
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usage();
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if (!strcmp(arg, "--verbose")) {
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ctl->verbose = 1;
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continue;
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}
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if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
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ctl->check_all = 1;
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continue;
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}
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if (!strcmp(arg, "-l") || !strcmp(arg, "--list")) {
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if (argc < 2) {
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print_all_signals(stdout, 0);
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exit(EXIT_SUCCESS);
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}
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if (2 < argc)
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errx(EXIT_FAILURE, _("too many arguments"));
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/* argc == 2, accept "kill -l $?" */
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arg = argv[1];
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if ((ctl->numsig = arg_to_signum(arg, 1)) < 0)
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errx(EXIT_FAILURE, _("unknown signal: %s"),
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arg);
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print_signal_name(ctl->numsig);
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exit(EXIT_SUCCESS);
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}
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/* for compatibility with procps kill(1) */
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if (!strncmp(arg, "--list=", 7) || !strncmp(arg, "-l=", 3)) {
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char *p = strchr(arg, '=') + 1;
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if ((ctl->numsig = arg_to_signum(p, 1)) < 0)
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errx(EXIT_FAILURE, _("unknown signal: %s"), p);
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print_signal_name(ctl->numsig);
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exit(EXIT_SUCCESS);
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}
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if (!strcmp(arg, "-L") || !strcmp(arg, "--table")) {
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print_all_signals(stdout, 1);
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exit(EXIT_SUCCESS);
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}
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if (!strcmp(arg, "-p") || !strcmp(arg, "--pid")) {
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ctl->do_pid = 1;
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if (ctl->do_kill)
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errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--signal");
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#ifdef HAVE_SIGQUEUE
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if (ctl->use_sigval)
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errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--queue");
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#endif
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continue;
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}
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if (!strcmp(arg, "-s") || !strcmp(arg, "--signal")) {
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if (argc < 2)
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errx(EXIT_FAILURE, _("not enough arguments"));
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ctl->do_kill = 1;
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if (ctl->do_pid)
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errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--signal");
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argc--, argv++;
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arg = *argv;
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if ((ctl->numsig = arg_to_signum(arg, 0)) < 0)
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err_nosig(arg);
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continue;
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}
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#ifdef HAVE_SIGQUEUE
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if (!strcmp(arg, "-q") || !strcmp(arg, "--queue")) {
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if (argc < 2)
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errx(EXIT_FAILURE, _("option '%s' requires an argument"), arg);
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if (ctl->do_pid)
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errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--queue");
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argc--, argv++;
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arg = *argv;
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ctl->sigdata.sival_int = strtos32_or_err(arg, _("argument error"));
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ctl->use_sigval = 1;
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continue;
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}
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#endif
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#ifdef UL_HAVE_PIDFD
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if (!strcmp(arg, "--timeout")) {
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struct timeouts *next;
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ctl->timeout = 1;
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if (argc < 2)
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errx(EXIT_FAILURE, _("option '%s' requires an argument"), arg);
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argc--, argv++;
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arg = *argv;
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next = xcalloc(1, sizeof(*next));
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next->period = strtos32_or_err(arg, _("argument error"));
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INIT_LIST_HEAD(&next->follow_ups);
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argc--, argv++;
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arg = *argv;
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if ((next->sig = arg_to_signum(arg, 0)) < 0)
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err_nosig(arg);
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list_add_tail(&next->follow_ups, &ctl->follow_ups);
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continue;
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}
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#endif
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/* 'arg' begins with a dash but is not a known option.
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* So it's probably something like -HUP, or -1/-n try to
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* deal with it.
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*
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* -n could be either signal n or pid -n (a process group
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* number). In case of doubt, POSIX tells us to assume a
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* signal. But if a signal has already been parsed, then
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* assume it is a process group, so stop parsing options. */
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if (ctl->do_kill)
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break;
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arg++;
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if ((ctl->numsig = arg_to_signum(arg, 0)) < 0)
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errx(EXIT_FAILURE, _("invalid signal name or number: %s"), arg);
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ctl->do_kill = 1;
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if (ctl->do_pid)
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errx(EXIT_FAILURE, _("%s and %s are mutually exclusive"), "--pid", "--signal");
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}
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if (!*argv)
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errx(EXIT_FAILURE, _("not enough arguments"));
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return argv;
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}
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#ifdef UL_HAVE_PIDFD
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static int kill_with_timeout(const struct kill_control *ctl)
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{
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int pfd, n;
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struct pollfd p = { 0 };
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siginfo_t info = { 0 };
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struct list_head *entry;
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info.si_code = SI_QUEUE;
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info.si_signo = ctl->numsig;
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info.si_uid = getuid();
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info.si_pid = getpid();
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info.si_value.sival_int =
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ctl->use_sigval != 0 ? ctl->use_sigval : ctl->numsig;
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if ((pfd = pidfd_open(ctl->pid, 0)) < 0)
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err(EXIT_FAILURE, _("pidfd_open() failed: %d"), ctl->pid);
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p.fd = pfd;
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p.events = POLLIN;
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if (pidfd_send_signal(pfd, ctl->numsig, &info, 0) < 0)
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err(EXIT_FAILURE, _("pidfd_send_signal() failed"));
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list_for_each(entry, &ctl->follow_ups) {
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struct timeouts *timeout;
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timeout = list_entry(entry, struct timeouts, follow_ups);
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n = poll(&p, 1, timeout->period);
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if (n < 0)
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err(EXIT_FAILURE, _("poll() failed"));
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if (n == 0) {
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info.si_signo = timeout->sig;
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if (ctl->verbose)
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printf(_("timeout, sending signal %d to pid %d\n"),
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timeout->sig, ctl->pid);
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if (pidfd_send_signal(pfd, timeout->sig, &info, 0) < 0)
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err(EXIT_FAILURE, _("pidfd_send_signal() failed"));
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}
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}
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return 0;
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}
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#endif
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static int kill_verbose(const struct kill_control *ctl)
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{
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int rc = 0;
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if (ctl->verbose)
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printf(_("sending signal %d to pid %d\n"), ctl->numsig, ctl->pid);
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if (ctl->do_pid) {
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printf("%ld\n", (long) ctl->pid);
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return 0;
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}
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#ifdef UL_HAVE_PIDFD
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if (ctl->timeout) {
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rc = kill_with_timeout(ctl);
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} else
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#endif
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#ifdef HAVE_SIGQUEUE
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if (ctl->use_sigval)
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rc = sigqueue(ctl->pid, ctl->numsig, ctl->sigdata);
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else
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#endif
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rc = kill(ctl->pid, ctl->numsig);
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if (rc < 0)
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warn(_("sending signal to %s failed"), ctl->arg);
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return rc;
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}
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int main(int argc, char **argv)
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{
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struct kill_control ctl = { .numsig = SIGTERM };
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int nerrs = 0, ct = 0;
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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close_stdout_atexit();
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#ifdef UL_HAVE_PIDFD
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INIT_LIST_HEAD(&ctl.follow_ups);
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#endif
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argv = parse_arguments(argc, argv, &ctl);
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/* The rest of the arguments should be process ids and names. */
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for ( ; (ctl.arg = *argv) != NULL; argv++) {
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char *ep = NULL;
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errno = 0;
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ctl.pid = strtol(ctl.arg, &ep, 10);
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if (errno == 0 && ep && *ep == '\0' && ctl.arg < ep) {
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if (kill_verbose(&ctl) != 0)
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nerrs++;
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ct++;
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} else {
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struct proc_processes *ps = proc_open_processes();
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int found = 0;
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if (!ps)
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continue;
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if (!ctl.check_all)
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proc_processes_filter_by_uid(ps, getuid());
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proc_processes_filter_by_name(ps, ctl.arg);
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while (proc_next_pid(ps, &ctl.pid) == 0) {
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if (kill_verbose(&ctl) != 0)
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nerrs++;
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ct++;
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found = 1;
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}
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proc_close_processes(ps);
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if (!found) {
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nerrs++, ct++;
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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 */
|
|
}
|
|
|