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