520 lines
14 KiB
C
520 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 "procutils.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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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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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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verbose:1;
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};
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static const struct signv {
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const char *name;
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int val;
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} sys_signame[] = {
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/* POSIX signals */
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{ "HUP", SIGHUP }, /* 1 */
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{ "INT", SIGINT }, /* 2 */
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{ "QUIT", SIGQUIT }, /* 3 */
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{ "ILL", SIGILL }, /* 4 */
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#ifdef SIGTRAP
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{ "TRAP", SIGTRAP }, /* 5 */
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#endif
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{ "ABRT", SIGABRT }, /* 6 */
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#ifdef SIGIOT
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{ "IOT", SIGIOT }, /* 6, same as SIGABRT */
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#endif
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#ifdef SIGEMT
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{ "EMT", SIGEMT }, /* 7 (mips,alpha,sparc*) */
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#endif
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#ifdef SIGBUS
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{ "BUS", SIGBUS }, /* 7 (arm,i386,m68k,ppc), 10 (mips,alpha,sparc*) */
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#endif
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{ "FPE", SIGFPE }, /* 8 */
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{ "KILL", SIGKILL }, /* 9 */
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{ "USR1", SIGUSR1 }, /* 10 (arm,i386,m68k,ppc), 30 (alpha,sparc*), 16 (mips) */
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{ "SEGV", SIGSEGV }, /* 11 */
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{ "USR2", SIGUSR2 }, /* 12 (arm,i386,m68k,ppc), 31 (alpha,sparc*), 17 (mips) */
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{ "PIPE", SIGPIPE }, /* 13 */
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{ "ALRM", SIGALRM }, /* 14 */
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{ "TERM", SIGTERM }, /* 15 */
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#ifdef SIGSTKFLT
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{ "STKFLT", SIGSTKFLT }, /* 16 (arm,i386,m68k,ppc) */
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#endif
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{ "CHLD", SIGCHLD }, /* 17 (arm,i386,m68k,ppc), 20 (alpha,sparc*), 18 (mips) */
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#ifdef SIGCLD
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{ "CLD", SIGCLD }, /* same as SIGCHLD (mips) */
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#endif
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{ "CONT", SIGCONT }, /* 18 (arm,i386,m68k,ppc), 19 (alpha,sparc*), 25 (mips) */
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{ "STOP", SIGSTOP }, /* 19 (arm,i386,m68k,ppc), 17 (alpha,sparc*), 23 (mips) */
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{ "TSTP", SIGTSTP }, /* 20 (arm,i386,m68k,ppc), 18 (alpha,sparc*), 24 (mips) */
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{ "TTIN", SIGTTIN }, /* 21 (arm,i386,m68k,ppc,alpha,sparc*), 26 (mips) */
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{ "TTOU", SIGTTOU }, /* 22 (arm,i386,m68k,ppc,alpha,sparc*), 27 (mips) */
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#ifdef SIGURG
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{ "URG", SIGURG }, /* 23 (arm,i386,m68k,ppc), 16 (alpha,sparc*), 21 (mips) */
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#endif
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#ifdef SIGXCPU
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{ "XCPU", SIGXCPU }, /* 24 (arm,i386,m68k,ppc,alpha,sparc*), 30 (mips) */
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#endif
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#ifdef SIGXFSZ
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{ "XFSZ", SIGXFSZ }, /* 25 (arm,i386,m68k,ppc,alpha,sparc*), 31 (mips) */
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#endif
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#ifdef SIGVTALRM
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{ "VTALRM", SIGVTALRM }, /* 26 (arm,i386,m68k,ppc,alpha,sparc*), 28 (mips) */
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#endif
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#ifdef SIGPROF
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{ "PROF", SIGPROF }, /* 27 (arm,i386,m68k,ppc,alpha,sparc*), 29 (mips) */
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#endif
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#ifdef SIGWINCH
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{ "WINCH", SIGWINCH }, /* 28 (arm,i386,m68k,ppc,alpha,sparc*), 20 (mips) */
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#endif
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#ifdef SIGIO
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{ "IO", SIGIO }, /* 29 (arm,i386,m68k,ppc), 23 (alpha,sparc*), 22 (mips) */
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#endif
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#ifdef SIGPOLL
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{ "POLL", SIGPOLL }, /* same as SIGIO */
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#endif
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#ifdef SIGINFO
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{ "INFO", SIGINFO }, /* 29 (alpha) */
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#endif
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#ifdef SIGLOST
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{ "LOST", SIGLOST }, /* 29 (arm,i386,m68k,ppc,sparc*) */
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#endif
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#ifdef SIGPWR
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{ "PWR", SIGPWR }, /* 30 (arm,i386,m68k,ppc), 29 (alpha,sparc*), 19 (mips) */
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#endif
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#ifdef SIGUNUSED
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{ "UNUSED", SIGUNUSED }, /* 31 (arm,i386,m68k,ppc) */
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#endif
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#ifdef SIGSYS
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{ "SYS", SIGSYS }, /* 31 (mips,alpha,sparc*) */
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#endif
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};
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static void print_signal_name(int signum)
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{
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size_t n;
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for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
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if (sys_signame[n].val == signum) {
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printf("%s\n", sys_signame[n].name);
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return;
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}
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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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if (!pretty) {
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for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
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lth = 1 + strlen(sys_signame[n].name);
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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(sys_signame[n].name, 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; n < ARRAY_SIZE(sys_signame); n++)
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pretty_print_signal(fp, width, &lpos,
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sys_signame[n].val, sys_signame[n].name);
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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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#ifdef SIGRTMIN
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static int rtsig_to_signum(char *sig)
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{
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int num, maxi = 0;
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char *ep = NULL;
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if (strncasecmp(sig, "min+", 4) == 0)
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sig += 4;
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else if (strncasecmp(sig, "max-", 4) == 0) {
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sig += 4;
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maxi = 1;
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}
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if (!isdigit(*sig))
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return -1;
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errno = 0;
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num = strtol(sig, &ep, 10);
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if (!ep || sig == ep || errno || num < 0)
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return -1;
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num = maxi ? SIGRTMAX - num : SIGRTMIN + num;
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if (num < SIGRTMIN || SIGRTMAX < num)
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return -1;
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return num;
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}
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#endif
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static int signame_to_signum(char *sig)
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{
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size_t n;
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if (!strncasecmp(sig, "sig", 3))
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sig += 3;
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#ifdef SIGRTMIN
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/* RT signals */
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if (!strncasecmp(sig, "rt", 2))
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return rtsig_to_signum(sig + 2);
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#endif
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/* Normal signals */
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for (n = 0; n < ARRAY_SIZE(sys_signame); n++) {
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if (!strcasecmp(sys_signame[n].name, sig))
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return sys_signame[n].val;
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}
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return -1;
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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(FILE *out)
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{
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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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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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fputs(USAGE_HELP, out);
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fputs(USAGE_VERSION, out);
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fprintf(out, USAGE_MAN_TAIL("kill(1)"));
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exit(out == stderr ? EXIT_FAILURE : 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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printf(UTIL_LINUX_VERSION);
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exit(EXIT_SUCCESS);
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}
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if (!strcmp(arg, "-h") || !strcmp(arg, "--help"))
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usage(stdout);
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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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/* '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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continue;
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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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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 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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atexit(close_stdout);
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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);
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}
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}
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}
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if (ct && nerrs == 0)
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return EXIT_SUCCESS; /* full success */
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else if (ct == nerrs)
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return EXIT_FAILURE; /* all failed */
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return KILL_EXIT_SOMEOK; /* partial success */
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}
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