/* vi: set sw=4 ts=4: */
/*
- * Mini kill/killall implementation for busybox
+ * 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 the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-#include "busybox.h"
+#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
+ */
-int kill_main(int argc, char **argv);
int kill_main(int argc, char **argv)
{
char *arg;
pid_t pid;
int signo = SIGTERM, errors = 0, quiet = 0;
- const int killall = (ENABLE_KILLALL && applet_name[4] == 'a'
- && (!ENABLE_KILLALL5 || applet_name[7] != '5'));
- const int killall5 = (ENABLE_KILLALL5 && applet_name[4] == 'a'
- && (!ENABLE_KILLALL || applet_name[7] == '5'));
+#if !ENABLE_KILLALL && !ENABLE_KILLALL5
+#define killall 0
+#define killall5 0
+#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')
+#endif
/* Parse any options */
argc--;
goto do_it_now;
}
- /* The -l option, which prints out signal names. */
+ /* 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') {
- const char *name;
if (argc == 1) {
/* Print the whole signal list */
- int col = 0;
- for (signo = 1; signo < 32; signo++) {
- name = get_signame(signo);
- if (isdigit(name[0])) continue;
- if (col > 66) {
- puts("");
- col = 0;
+ print_signames();
+ return 0;
+ }
+ /* -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;
}
- col += printf("%2d) %-6s", signo, name);
- }
- puts("");
- } else { /* -l <sig list> */
- while ((arg = *++argv)) {
- if (isdigit(arg[0])) {
- signo = xatoi_u(arg);
- name = get_signame(signo);
- } else {
- signo = get_signum(arg);
- if (signo < 0)
- bb_error_msg_and_die("unknown signal '%s'", arg);
- name = get_signame(signo);
+ /* 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("%2d) %s\n", signo, name);
+ printf("%d\n", signo);
}
}
/* If they specified -l, we are all done */
quiet = 1;
arg = *++argv;
argc--;
- if (argc < 1) bb_show_usage();
- if (arg[0] != '-') goto do_it_now;
+ if (argc < 1)
+ bb_show_usage();
+ if (arg[0] != '-')
+ goto do_it_now;
}
- /* -SIG */
- signo = get_signum(&arg[1]);
- if (signo < 0)
- bb_error_msg_and_die("bad signal name '%s'", &arg[1]);
+ arg++; /* skip '-' */
+
+ /* -o PID? (if present, it always is at the end of command line) */
+ if (killall5 && arg[0] == 'o')
+ goto do_it_now;
+
+ if (argc > 1 && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
+ argc--;
+ 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;
argc--;
-do_it_now:
+ do_it_now:
+ pid = getpid();
if (killall5) {
pid_t sid;
procps_status_t* p = NULL;
+ int ret = 0;
-// Cannot happen anyway? We don't TERM ourself, we STOP
-// /* kill(-1, sig) on Linux (at least 2.1.x)
-// * might send signal to the calling process too */
-// signal(SIGTERM, SIG_IGN);
- /* 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 */
+ /* Stop all processes */
+ kill(-1, SIGSTOP);
+ /* Signal all processes except those in 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);
+ int i;
+
+ if (p->sid == (unsigned)sid
+ || p->pid == (unsigned)pid
+ || p->pid == 1)
+ continue;
+
+ /* All remaining args must be -o PID options.
+ * Check p->pid against them. */
+ for (i = 0; i < argc; i++) {
+ pid_t omit;
+
+ arg = argv[i];
+ if (arg[0] != '-' || arg[1] != 'o') {
+ bb_error_msg("bad option '%s'", arg);
+ ret = 1;
+ goto resume;
+ }
+ arg += 2;
+ if (!arg[0] && argv[++i])
+ arg = argv[i];
+ omit = bb_strtoi(arg, NULL, 10);
+ if (errno) {
+ bb_error_msg("invalid number '%s'", arg);
+ ret = 1;
+ goto resume;
+ }
+ if (p->pid == omit)
+ goto dont_kill;
+ }
+ kill(p->pid, signo);
+ dont_kill: ;
}
+ resume:
/* And let them continue */
kill(-1, SIGCONT);
- return 0;
+ return ret;
}
- /* Pid or name required for kill/killall */
- if (argc < 1)
- bb_show_usage();
+ /* Pid or name is required for kill/killall */
+ if (argc < 1) {
+ bb_error_msg("you need to specify whom to kill");
+ return EXIT_FAILURE;
+ }
if (killall) {
/* Looks like they want to do a killall. Do that */
- pid = getpid();
while (arg) {
pid_t* pidList;
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);
/* Looks like they want to do a kill. Do that */
while (arg) {
- /* Huh?
- if (!isdigit(arg[0]) && arg[0] != '-')
- bb_error_msg_and_die("bad pid '%s'", arg);
- */
- pid = xatou(arg);
- /* FIXME: better overflow check? */
- if (kill(pid, signo) != 0) {
- bb_perror_msg("cannot kill pid %u", (unsigned)pid);
+ /* Support shell 'space' trick */
+ if (arg[0] == ' ')
+ arg++;
+ 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++;
}
arg = *++argv;
projects / oweals / busybox.git / blobdiff