/* 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) 1999-200
3 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 1999-200
4 by Erik Andersen <andersen@codepoet.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#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 program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
+ * This brings some complications:
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * + 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
*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <unistd.h>
-#include <signal.h>
-#include <ctype.h>
-#include <string.h>
-#include <unistd.h>
-#include "busybox.h"
-
-static const int KILL = 0;
-static const int KILLALL = 1;
-
-extern int kill_main(int argc, char **argv)
+int kill_main(int argc, char **argv)
{
- int whichApp, signo = SIGTERM, quiet = 0;
- const char *name;
- int errors = 0;
-
-#ifdef CONFIG_KILLALL
- /* Figure out what we are trying to do here */
- whichApp = (strcmp(bb_applet_name, "killall") == 0)? KILLALL : KILL;
+ char *arg;
+ pid_t pid;
+ int signo = SIGTERM, errors = 0, quiet = 0;
+#if !ENABLE_KILLALL && !ENABLE_KILLALL5
+#define killall 0
+#define killall5 0
#else
- whichApp = KILL;
+/* 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 */
- if (argc < 2)
- bb_show_usage();
+ argc--;
+ arg = *++argv;
- if(argv[1][0] != '-'){
- argv++;
- argc--;
+ if (argc < 1 || arg[0] != '-') {
goto do_it_now;
}
- /* The -l option, which prints out signal names. */
- if(argv[1][1]=='l' && argv[1][2]=='\0'){
- if(argc==2) {
+ /* 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') {
+ if (argc == 1) {
/* Print the whole signal list */
- int col = 0;
- for(signo=1; signo < NSIG; signo++) {
- name = u_signal_names(0, &signo, 1);
- if(name==NULL) /* unnamed */
- continue;
- col += printf("%2d) %-16s", signo, name);
- if (col > 60) {
- printf("\n");
- 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;
}
- }
- printf("\n");
-
- } else {
- for(argv++; *argv; argv++) {
- name = u_signal_names(*argv, &signo, -1);
- if(name!=NULL)
- printf("%s\n", name);
+ /* 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, were all done */
+ /* If they specified -l, we are all done */
return EXIT_SUCCESS;
}
/* The -q quiet option */
- if(argv[1][1]=='q' && argv[1][2]=='\0'){
- quiet++;
- argv++;
+ if (killall && arg[1] == 'q' && arg[2] == '\0') {
+ quiet = 1;
+ arg = *++argv;
argc--;
- if(argv[1][0] != '-'){
+ if (argc < 1)
+ bb_show_usage();
+ if (arg[0] != '-')
goto do_it_now;
- }
}
- if(!u_signal_names(argv[1]+1, &signo, 0))
- bb_error_msg_and_die( "bad signal name '%s'", argv[1]+1);
- argv+=2;
- argc-=2;
-
-do_it_now:
+ arg++; /* skip '-' */
- if (whichApp == KILL) {
- /* Looks like they want to do a kill. Do that */
- while (--argc >= 0) {
- int pid;
+ /* -o PID? (if present, it always is at the end of command line) */
+ if (killall5 && arg[0] == 'o')
+ goto do_it_now;
- if (!isdigit(**argv))
- bb_error_msg_and_die( "Bad PID '%s'", *argv);
- pid = strtol(*argv, NULL, 0);
- if (kill(pid, signo) != 0) {
- bb_perror_msg( "Could not kill pid '%d'", pid);
- errors++;
+ 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:
+ pid = getpid();
+
+ if (killall5) {
+ pid_t sid;
+ procps_status_t* p = NULL;
+ int ret = 0;
+
+ /* Find out our session id */
+ sid = getsid(pid);
+ /* Stop all processes */
+ kill(-1, SIGSTOP);
+ /* Signal all processes except those in our session */
+ while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) {
+ 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;
}
- argv++;
+ kill(p->pid, signo);
+ dont_kill: ;
}
+ resume:
+ /* And let them continue */
+ kill(-1, SIGCONT);
+ return ret;
+ }
- }
-#ifdef CONFIG_KILLALL
- else {
- pid_t myPid=getpid();
+ /* 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 */
- while (--argc >= 0) {
- long* pidList;
+ while (arg) {
+ pid_t* pidList;
- pidList = find_pid_by_name(*argv);
- if (!pidList || *pidList<=0) {
+ pidList = find_pid_by_name(arg);
+ if (*pidList == 0) {
errors++;
- if (quiet==0)
- bb_error_msg( "%s: no process killed", *argv);
+ if (!quiet)
+ bb_error_msg("%s: no process killed", arg);
} else {
- long *pl;
+ pid_t *pl;
- for(pl = pidList; *pl !=0 ; pl++) {
- if (*pl==myPid)
+ for (pl = pidList; *pl; pl++) {
+ if (*pl == pid)
continue;
- if (kill(*pl, signo) != 0) {
- errors++;
- if (quiet==0)
- bb_perror_msg( "Could not kill pid '%ld'", *pl);
- }
+ if (kill(*pl, signo) == 0)
+ continue;
+ errors++;
+ if (!quiet)
+ bb_perror_msg("can't kill pid %d", (int)*pl);
}
}
free(pidList);
- argv++;
+ arg = *++argv;
}
+ return errors;
+ }
+
+ /* Looks like they want to do a kill. Do that */
+ while (arg) {
+ /* 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;
}
-#endif
return errors;
}
projects / oweals / busybox.git / blobdiff