345 lines
9.4 KiB
C
345 lines
9.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini kill/killall[5] implementation for busybox
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config KILL
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//config: bool "kill (3.1 kb)"
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//config: default y
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//config: help
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//config: The command kill sends the specified signal to the specified
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//config: process or process group. If no signal is specified, the TERM
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//config: signal is sent.
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//config:
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//config:config KILLALL
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//config: bool "killall (5.6 kb)"
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//config: default y
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//config: help
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//config: killall sends a signal to all processes running any of the
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//config: specified commands. If no signal name is specified, SIGTERM is
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//config: sent.
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//config:
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//config:config KILLALL5
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//config: bool "killall5 (5.3 kb)"
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//config: default y
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//config: help
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//config: The SystemV killall command. killall5 sends a signal
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//config: to all processes except kernel threads and the processes
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//config: in its own session, so it won't kill the shell that is running
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//config: the script it was called from.
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//applet:IF_KILL( APPLET_NOFORK(kill, kill, BB_DIR_BIN, BB_SUID_DROP, kill))
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// APPLET_NOFORK:name main location suid_type help
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//applet:IF_KILLALL( APPLET_NOFORK(killall, kill, BB_DIR_USR_BIN, BB_SUID_DROP, killall))
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//applet:IF_KILLALL5(APPLET_NOFORK(killall5, kill, BB_DIR_USR_SBIN, BB_SUID_DROP, killall5))
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//kbuild:lib-$(CONFIG_KILL) += kill.o
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//kbuild:lib-$(CONFIG_KILLALL) += kill.o
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//kbuild:lib-$(CONFIG_KILLALL5) += kill.o
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//usage:#define kill_trivial_usage
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//usage: "[-l] [-SIG] PID..."
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//usage:#define kill_full_usage "\n\n"
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//usage: "Send a signal (default: TERM) to given PIDs\n"
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//usage: "\n -l List all signal names and numbers"
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/* //usage: "\n -s SIG Yet another way of specifying SIG" */
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//usage:
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//usage:#define kill_example_usage
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//usage: "$ ps | grep apache\n"
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//usage: "252 root root S [apache]\n"
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//usage: "263 www-data www-data S [apache]\n"
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//usage: "264 www-data www-data S [apache]\n"
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//usage: "265 www-data www-data S [apache]\n"
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//usage: "266 www-data www-data S [apache]\n"
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//usage: "267 www-data www-data S [apache]\n"
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//usage: "$ kill 252\n"
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//usage:
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//usage:#define killall_trivial_usage
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//usage: "[-lq] [-SIG] PROCESS_NAME..."
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//usage:#define killall_full_usage "\n\n"
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//usage: "Send a signal (default: TERM) to given processes\n"
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//usage: "\n -l List all signal names and numbers"
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/* //usage: "\n -s SIG Yet another way of specifying SIG" */
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//usage: "\n -q Don't complain if no processes were killed"
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//usage:
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//usage:#define killall_example_usage
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//usage: "$ killall apache\n"
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//usage:
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//usage:#define killall5_trivial_usage
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//usage: "[-l] [-SIG] [-o PID]..."
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//usage:#define killall5_full_usage "\n\n"
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//usage: "Send a signal (default: TERM) to all processes outside current session\n"
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//usage: "\n -l List all signal names and numbers"
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//usage: "\n -o PID Don't signal this PID"
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/* //usage: "\n -s SIG Yet another way of specifying SIG" */
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#include "libbb.h"
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/* Note: kill_main is directly called from shell in order to implement
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* kill built-in. Shell substitutes job ids with process groups first.
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*
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* This brings some complications:
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*
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* + we can't use xfunc here
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* + we can't use bb_show_usage
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* + applet_name can be the name of the shell
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* (doesn't apply for killall[5], still should be careful b/c NOFORK)
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*
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* kill %n gets translated into kill ' -<process group>' by shell (note space!)
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* This is needed to avoid collision with kill -9 ... syntax
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*/
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//kbuild:lib-$(CONFIG_ASH_JOB_CONTROL) += kill.o
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//kbuild:lib-$(CONFIG_HUSH_KILL) += kill.o
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#define SH_KILL (ENABLE_ASH_JOB_CONTROL || ENABLE_HUSH_KILL)
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/* If shells want to have "kill", for ifdefs it's like ENABLE_KILL=1 */
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#if SH_KILL
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# undef ENABLE_KILL
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# define ENABLE_KILL 1
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#endif
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#define KILL_APPLET_CNT (ENABLE_KILL + ENABLE_KILLALL + ENABLE_KILLALL5)
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int kill_main(int argc UNUSED_PARAM, char **argv)
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{
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char *arg;
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pid_t pid;
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int signo = SIGTERM, errors = 0;
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#if ENABLE_KILL || ENABLE_KILLALL
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int quiet = 0;
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#endif
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#if KILL_APPLET_CNT == 1
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# define is_killall ENABLE_KILLALL
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# define is_killall5 ENABLE_KILLALL5
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#else
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/* How to determine who we are? find 3rd char from the end:
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* kill, killall, killall5
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* ^i ^a ^l - it's unique
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* (checking from the start is complicated by /bin/kill... case) */
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const char char3 = argv[0][strlen(argv[0]) - 3];
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# define is_killall (ENABLE_KILLALL && char3 == 'a')
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# define is_killall5 (ENABLE_KILLALL5 && char3 == 'l')
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#endif
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/* Parse any options */
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arg = *++argv;
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if (!arg || arg[0] != '-') {
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goto do_it_now;
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}
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/* The -l option, which prints out signal names.
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* Intended usage in shell:
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* echo "Died of SIG`kill -l $?`"
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* We try to mimic what kill from coreutils-6.8 does */
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if (arg[1] == 'l' && arg[2] == '\0') {
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arg = *++argv;
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if (!arg) {
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/* Print the whole signal list */
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print_signames();
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return 0;
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}
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/* -l <sig list> */
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do {
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if (isdigit(arg[0])) {
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signo = bb_strtou(arg, NULL, 10);
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if (errno) {
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bb_error_msg("unknown signal '%s'", arg);
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return EXIT_FAILURE;
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}
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/* Exitcodes >= 0x80 are to be treated
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* as "killed by signal (exitcode & 0x7f)" */
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puts(get_signame(signo & 0x7f));
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/* TODO: 'bad' signal# - coreutils says:
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* kill: 127: invalid signal
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* we just print "127" instead */
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} else {
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signo = get_signum(arg);
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if (signo < 0) {
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bb_error_msg("unknown signal '%s'", arg);
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return EXIT_FAILURE;
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}
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printf("%d\n", signo);
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}
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arg = *++argv;
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} while (arg);
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return EXIT_SUCCESS;
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}
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/* The -q quiet option */
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if (is_killall && arg[1] == 'q' && arg[2] == '\0') {
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#if ENABLE_KILL || ENABLE_KILLALL
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quiet = 1;
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#endif
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arg = *++argv;
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if (!arg)
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bb_show_usage();
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if (arg[0] != '-')
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goto do_it_now;
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}
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arg++; /* skip '-' */
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/* -o PID? (if present, it always is at the end of command line) */
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if (is_killall5 && arg[0] == 'o')
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goto do_it_now;
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/* "--" separates options from args. Testcase: "kill -- -123" */
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if (!is_killall5 && arg[0] == '-' && arg[1] == '\0')
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goto do_it_sooner;
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if (argv[1] && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
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arg = *++argv;
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} /* else it must be -SIG */
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signo = get_signum(arg);
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if (signo < 0) {
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bb_error_msg("bad signal name '%s'", arg);
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return EXIT_FAILURE;
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}
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do_it_sooner:
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arg = *++argv;
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do_it_now:
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pid = getpid();
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if (is_killall5) {
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pid_t sid;
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procps_status_t* p = NULL;
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/* compat: exitcode 2 is "no one was signaled" */
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errors = 2;
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/* Find out our session id */
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sid = getsid(pid);
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/* Stop all processes */
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if (signo != SIGSTOP && signo != SIGCONT)
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kill(-1, SIGSTOP);
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/* Signal all processes except those in our session */
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while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID)) != NULL) {
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char **args;
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if (p->sid == (unsigned)sid
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|| p->sid == 0 /* compat: kernel thread, don't signal it */
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|| p->pid == (unsigned)pid
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|| p->pid == 1
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) {
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continue;
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}
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/* All remaining args must be -o PID options.
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* Check p->pid against them. */
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args = argv;
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while (*args) {
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pid_t omit;
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arg = *args++;
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if (arg[0] != '-' || arg[1] != 'o') {
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bb_error_msg("bad option '%s'", arg);
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errors = 1;
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goto resume;
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}
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arg += 2;
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if (!arg[0] && *args)
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arg = *args++;
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omit = bb_strtoi(arg, NULL, 10);
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if (errno) {
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bb_error_msg("invalid number '%s'", arg);
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errors = 1;
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goto resume;
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}
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if (p->pid == omit)
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goto dont_kill;
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}
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kill(p->pid, signo);
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errors = 0;
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dont_kill: ;
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}
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resume:
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/* And let them continue */
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if (signo != SIGSTOP && signo != SIGCONT)
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kill(-1, SIGCONT);
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return errors;
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}
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#if ENABLE_KILL || ENABLE_KILLALL
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/* Pid or name is required for kill/killall */
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if (!arg) {
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bb_simple_error_msg("you need to specify whom to kill");
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return EXIT_FAILURE;
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}
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if (!ENABLE_KILL || is_killall) {
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/* Looks like they want to do a killall. Do that */
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do {
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pid_t* pidList;
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pidList = find_pid_by_name(arg);
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if (*pidList == 0) {
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errors++;
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if (!quiet)
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bb_error_msg("%s: no process killed", arg);
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} else {
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pid_t *pl;
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for (pl = pidList; *pl; pl++) {
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if (*pl == pid)
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continue;
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if (kill(*pl, signo) == 0)
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continue;
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errors++;
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if (!quiet)
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bb_perror_msg("can't kill pid %d", (int)*pl);
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}
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}
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free(pidList);
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arg = *++argv;
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} while (arg);
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return errors;
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}
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#endif
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#if ENABLE_KILL
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/* Looks like they want to do a kill. Do that */
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while (arg) {
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# if SH_KILL
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/*
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* We need to support shell's "hack formats" of
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* " -PRGP_ID" (yes, with a leading space)
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* and " PID1 PID2 PID3" (with degenerate case "")
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*/
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while (*arg != '\0') {
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char *end;
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if (*arg == ' ')
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arg++;
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pid = bb_strtoi(arg, &end, 10);
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if (errno && (errno != EINVAL || *end != ' ')) {
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bb_error_msg("invalid number '%s'", arg);
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errors++;
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break;
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}
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if (kill(pid, signo) != 0) {
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bb_perror_msg("can't kill pid %d", (int)pid);
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errors++;
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}
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arg = end; /* can only point to ' ' or '\0' now */
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}
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# else /* ENABLE_KILL but !SH_KILL */
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pid = bb_strtoi(arg, NULL, 10);
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if (errno) {
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bb_error_msg("invalid number '%s'", arg);
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errors++;
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} else if (kill(pid, signo) != 0) {
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bb_perror_msg("can't kill pid %d", (int)pid);
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errors++;
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}
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# endif
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arg = *++argv;
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}
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return errors;
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#endif
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}
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