* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config KILL
+//config: bool "kill (3.1 kb)"
+//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 (5.6 kb)"
+//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 (5.3 kb)"
+//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_NOFORK(kill, kill, BB_DIR_BIN, BB_SUID_DROP, kill))
+// APPLET_NOFORK:name main location suid_type help
+//applet:IF_KILLALL( APPLET_NOFORK(killall, kill, BB_DIR_USR_BIN, BB_SUID_DROP, killall))
+//applet:IF_KILLALL5(APPLET_NOFORK(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"
* + 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)
+ * (doesn't apply for killall[5], still should be careful b/c NOFORK)
*
* kill %n gets translated into kill ' -<process group>' by shell (note space!)
* This is needed to avoid collision with kill -9 ... syntax
*/
-int kill_main(int argc, char **argv);
-int kill_main(int argc, char **argv)
+//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 !ENABLE_KILLALL && !ENABLE_KILLALL5
-#define killall 0
-#define killall5 0
+ int signo = SIGTERM, errors = 0;
+#if ENABLE_KILL || ENABLE_KILLALL
+ int quiet = 0;
+#endif
+
+#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 killall (ENABLE_KILLALL && char3 == 'a')
-#define killall5 (ENABLE_KILLALL5 && char3 == 'l')
+# define is_killall (ENABLE_KILLALL && char3 == 'a')
+# define is_killall5 (ENABLE_KILLALL5 && char3 == 'l')
#endif
/* Parse any options */
- argc--;
arg = *++argv;
- if (argc < 1 || arg[0] != '-') {
+ if (!arg || arg[0] != '-') {
goto do_it_now;
}
* echo "Died of SIG`kill -l $?`"
* We try to mimic what kill from coreutils-6.8 does */
if (arg[1] == 'l' && arg[2] == '\0') {
- if (argc == 1) {
+ arg = *++argv;
+ if (!arg) {
/* Print the whole signal list */
- for (signo = 1; signo < 32; signo++) {
- const char *name = get_signame(signo);
- if (!isdigit(name[0]))
- puts(name);
- }
- } else { /* -l <sig list> */
- while ((arg = *++argv)) {
- 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);
+ 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);
}
- }
- /* If they specified -l, we are all done */
+ arg = *++argv;
+ } while (arg);
return EXIT_SUCCESS;
}
/* The -q quiet option */
- if (killall && arg[1] == 'q' && arg[2] == '\0') {
+ if (is_killall && arg[1] == 'q' && arg[2] == '\0') {
+#if ENABLE_KILL || ENABLE_KILLALL
quiet = 1;
+#endif
arg = *++argv;
- argc--;
- if (argc < 1) bb_show_usage();
- if (arg[0] != '-') goto do_it_now;
+ if (!arg)
+ bb_show_usage();
+ if (arg[0] != '-')
+ goto do_it_now;
}
- /* -SIG */
- signo = get_signum(&arg[1]);
- if (signo < 0) { /* || signo > MAX_SIGNUM ? */
- bb_error_msg("bad signal name '%s'", &arg[1]);
+ 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;
+
+ /* "--" separates options from args. Testcase: "kill -- -123" */
+ if (!is_killall5 && arg[0] == '-' && arg[1] == '\0')
+ goto do_it_sooner;
+
+ 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) {
+ bb_error_msg("bad signal name '%s'", arg);
return EXIT_FAILURE;
}
+ do_it_sooner:
arg = *++argv;
- argc--;
-do_it_now:
+ do_it_now:
+ pid = getpid();
- if (killall5) {
+ if (is_killall5) {
pid_t sid;
procps_status_t* p = NULL;
+ /* compat: exitcode 2 is "no one was signaled" */
+ errors = 2;
- /* Now stop all processes */
- kill(-1, SIGSTOP);
- /* Find out our own session id */
- pid = getpid();
+ /* Find out our session id */
sid = getsid(pid);
- /* Now kill all processes except our session */
- while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) {
- if (p->sid != sid && p->pid != pid && p->pid != 1)
- kill(p->pid, signo);
+ /* 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 */
- kill(-1, SIGCONT);
- return 0;
+ if (signo != SIGSTOP && signo != SIGCONT)
+ kill(-1, SIGCONT);
+ return errors;
}
+#if ENABLE_KILL || ENABLE_KILLALL
/* Pid or name is required for kill/killall */
- if (argc < 1) {
- puts("You need to specify whom to kill");
+ if (!arg) {
+ bb_simple_error_msg("you need to specify whom to kill");
return EXIT_FAILURE;
}
- if (killall) {
+ if (!ENABLE_KILL || is_killall) {
/* Looks like they want to do a killall. Do that */
- pid = getpid();
- while (arg) {
+ do {
pid_t* pidList;
pidList = find_pid_by_name(arg);
continue;
errors++;
if (!quiet)
- bb_perror_msg("cannot kill pid %u", (unsigned)*pl);
+ 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) {
- /* Support shell 'space' trick */
- if (arg[0] == ' ')
- 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("bad pid '%s'", arg);
+ bb_error_msg("invalid number '%s'", arg);
errors++;
} else if (kill(pid, signo) != 0) {
- bb_perror_msg("cannot kill pid %d", (int)pid);
+ bb_perror_msg("can't kill pid %d", (int)pid);
errors++;
}
+# endif
arg = *++argv;
}
return errors;
+#endif
}
projects / oweals / busybox.git / blobdiff