X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=procps%2Fkill.c;h=224e5ad1a41c21d68220318183c467974f921615;hb=66426760beef7e87c4735f433d123daf911b5b4a;hp=e72b73493928829d452ee9952cba166a399cbbfd;hpb=7dc160721ee3ceb76240a43d1454b45aaa9dbee4;p=oweals%2Fbusybox.git diff --git a/procps/kill.c b/procps/kill.c index e72b73493..224e5ad1a 100644 --- a/procps/kill.c +++ b/procps/kill.c @@ -1,216 +1,279 @@ +/* vi: set sw=4 ts=4: */ /* - * Mini kill implementation for busybox + * Mini kill/killall[5] implementation for busybox * * Copyright (C) 1995, 1996 by Bruce Perens . + * Copyright (C) 1999-2004 by Erik Andersen * - * 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. + */ + +//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 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 ' -' by shell (note space!) + * This is needed to avoid collision with kill -9 ... syntax */ - -#include "internal.h" -#include -#include -#include -#include -#include -#include -#include - -static const char* kill_usage = "kill [-signal] process-id [process-id ...]\n\n" -"Send a signal (default is SIGTERM) to the specified process(es).\n\n" -"Options:\n" -"\t-l\tList all signal names and numbers.\n\n"; - - -struct signal_name { - const char *name; - int number; -}; - -const struct signal_name signames[] = { - {"HUP", SIGHUP}, - {"INT", SIGINT}, - {"QUIT", SIGQUIT}, - {"ILL", SIGILL}, - {"TRAP", SIGTRAP}, - {"ABRT", SIGABRT}, -#ifndef __alpha__ - {"IOT", SIGIOT}, -#endif -#if defined(__sparc__) || defined(__alpha__) - {"EMT", SIGEMT}, -#else - {"BUS", SIGBUS}, -#endif - {"FPE", SIGFPE}, - {"KILL", SIGKILL}, -#if defined(__sparc__) || defined(__alpha__) - {"BUS", SIGBUS}, -#else - {"USR1", SIGUSR1}, -#endif - {"SEGV", SIGSEGV}, -#if defined(__sparc__) || defined(__alpha__) - {"SYS", SIGSYS}, -#else - {"USR2", SIGUSR2}, -#endif - {"PIPE", SIGPIPE}, - {"ALRM", SIGALRM}, - {"TERM", SIGTERM}, -#if defined(__sparc__) || defined(__alpha__) - {"URG", SIGURG}, - {"STOP", SIGSTOP}, - {"TSTP", SIGTSTP}, - {"CONT", SIGCONT}, - {"CHLD", SIGCHLD}, - {"TTIN", SIGTTIN}, - {"TTOU", SIGTTOU}, - {"IO", SIGIO}, -# ifndef __alpha__ - {"POLL", SIGIO}, -# endif - {"XCPU", SIGXCPU}, - {"XFSZ", SIGXFSZ}, - {"VTALRM", SIGVTALRM}, - {"PROF", SIGPROF}, - {"WINCH", SIGWINCH}, -# ifdef __alpha__ - {"INFO", SIGINFO}, -# else - {"LOST", SIGLOST}, -# endif - {"USR1", SIGUSR1}, - {"USR2", SIGUSR2}, +int kill_main(int argc, 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 #else - {"STKFLT", SIGSTKFLT}, - {"CHLD", SIGCHLD}, - {"CONT", SIGCONT}, - {"STOP", SIGSTOP}, - {"TSTP", SIGTSTP}, - {"TTIN", SIGTTIN}, - {"TTOU", SIGTTOU}, - {"URG", SIGURG}, - {"XCPU", SIGXCPU}, - {"XFSZ", SIGXFSZ}, - {"VTALRM", SIGVTALRM}, - {"PROF", SIGPROF}, - {"WINCH", SIGWINCH}, - {"IO", SIGIO}, - {"POLL", SIGPOLL}, - {"PWR", SIGPWR}, - {"UNUSED", SIGUNUSED}, +/* 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 - {0, 0} -}; -extern int kill_main (int argc, char **argv) -{ - int sig = SIGTERM; - - argc--; - argv++; - /* Parse any options */ - if (argc < 1) - usage(kill_usage); - - while (argc > 0 && **argv == '-') { - while (*++(*argv)) { - switch (**argv) { - case 'l': - { - int col=0; - const struct signal_name *s = signames; - - while (s->name != 0) { - col+=fprintf(stderr, "%2d) %-8s", s->number, (s++)->name); - if (col>60) { - fprintf(stderr, "\n"); - col=0; - } - } - fprintf(stderr, "\n\n"); - exit( TRUE); + /* Parse any options */ + argc--; + arg = *++argv; + + if (argc < 1 || 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') { + if (argc == 1) { + /* Print the whole signal list */ + print_signames(); + return 0; } - break; - case '-': - usage(kill_usage); - default: - { - if (isdigit( **argv)) { - sig = atoi (*argv); - if (sig < 0 || sig >= NSIG) - goto end; - else { - argc--; - argv++; - goto do_it_now; + /* -l */ + 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); } - } - else { - const struct signal_name *s = signames; - while (s->name != 0) { - if (strcasecmp (s->name, *argv) == 0) { - sig = s->number; - argc--; - argv++; - goto do_it_now; - } - s++; - } - if (s->name == 0) - goto end; - } } - } + /* If they specified -l, we are all done */ + return EXIT_SUCCESS; + } + + /* The -q quiet option */ + if (killall && arg[1] == 'q' && arg[2] == '\0') { + quiet = 1; + arg = *++argv; + argc--; + if (argc < 1) + 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 (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--; - argv++; + + 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; + } + kill(p->pid, signo); + dont_kill: ; + } + resume: + /* And let them continue */ + kill(-1, SIGCONT); + return ret; } - } - -do_it_now: - - while (--argc >= 0) { - int pid; - struct stat statbuf; - char pidpath[20]="/proc/"; - - if (! isdigit( **argv)) { - fprintf(stderr, "bad PID: %s\n", *argv); - exit( FALSE); - } - pid = atoi (*argv); - snprintf(pidpath, 20, "/proc/%s/stat", *argv); - if (stat( pidpath, &statbuf)!=0) { - fprintf(stderr, "kill: (%d) - No such pid\n", pid); - exit( FALSE); + + /* Pid or name is required for kill/killall */ + if (argc < 1) { + bb_error_msg("you need to specify whom to kill"); + return EXIT_FAILURE; } - fprintf(stderr, "sig = %d\n", sig); - if (kill (pid, sig) != 0) { - perror (*argv); - exit ( FALSE); - } - argv++; - } - exit ( TRUE); - - -end: - fprintf(stderr, "bad signal name: %s\n", *argv); - exit (TRUE); -} + if (killall) { + /* Looks like they want to do a killall. Do that */ + while (arg) { + 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; + } + return errors; + } + + /* Looks like they want to do a kill. Do that */ + while (arg) { +#if ENABLE_ASH || ENABLE_HUSH + /* + * 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); + *end = '\0'; + errors++; + } else 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 + 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; +}