[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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[1765] | 3 | * Mini kill/killall[5] implementation for busybox
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[821] | 4 | *
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| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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| 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 7 | *
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[2725] | 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 9 | */
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| 10 |
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[3232] | 11 | //usage:#define kill_trivial_usage
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| 12 | //usage: "[-l] [-SIG] PID..."
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| 13 | //usage:#define kill_full_usage "\n\n"
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| 14 | //usage: "Send a signal (default: TERM) to given PIDs\n"
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| 15 | //usage: "\n -l List all signal names and numbers"
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| 16 | /* //usage: "\n -s SIG Yet another way of specifying SIG" */
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| 17 | //usage:
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| 18 | //usage:#define kill_example_usage
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| 19 | //usage: "$ ps | grep apache\n"
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| 20 | //usage: "252 root root S [apache]\n"
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| 21 | //usage: "263 www-data www-data S [apache]\n"
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| 22 | //usage: "264 www-data www-data S [apache]\n"
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| 23 | //usage: "265 www-data www-data S [apache]\n"
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| 24 | //usage: "266 www-data www-data S [apache]\n"
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| 25 | //usage: "267 www-data www-data S [apache]\n"
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| 26 | //usage: "$ kill 252\n"
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| 27 | //usage:
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| 28 | //usage:#define killall_trivial_usage
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| 29 | //usage: "[-l] [-q] [-SIG] PROCESS_NAME..."
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| 30 | //usage:#define killall_full_usage "\n\n"
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| 31 | //usage: "Send a signal (default: TERM) to given processes\n"
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| 32 | //usage: "\n -l List all signal names and numbers"
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| 33 | /* //usage: "\n -s SIG Yet another way of specifying SIG" */
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| 34 | //usage: "\n -q Don't complain if no processes were killed"
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| 35 | //usage:
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| 36 | //usage:#define killall_example_usage
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| 37 | //usage: "$ killall apache\n"
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| 38 | //usage:
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| 39 | //usage:#define killall5_trivial_usage
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| 40 | //usage: "[-l] [-SIG] [-o PID]..."
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| 41 | //usage:#define killall5_full_usage "\n\n"
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| 42 | //usage: "Send a signal (default: TERM) to all processes outside current session\n"
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| 43 | //usage: "\n -l List all signal names and numbers"
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| 44 | //usage: "\n -o PID Don't signal this PID"
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| 45 | /* //usage: "\n -s SIG Yet another way of specifying SIG" */
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| 46 |
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[1765] | 47 | #include "libbb.h"
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[821] | 48 |
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[1765] | 49 | /* Note: kill_main is directly called from shell in order to implement
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| 50 | * kill built-in. Shell substitutes job ids with process groups first.
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| 51 | *
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| 52 | * This brings some complications:
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| 53 | *
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| 54 | * + we can't use xfunc here
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| 55 | * + we can't use applet_name
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| 56 | * + we can't use bb_show_usage
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| 57 | * (Above doesn't apply for killall[5] cases)
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| 58 | *
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| 59 | * kill %n gets translated into kill ' -<process group>' by shell (note space!)
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| 60 | * This is needed to avoid collision with kill -9 ... syntax
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| 61 | */
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[821] | 62 |
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[3621] | 63 | int kill_main(int argc UNUSED_PARAM, char **argv)
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[821] | 64 | {
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[1765] | 65 | char *arg;
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| 66 | pid_t pid;
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| 67 | int signo = SIGTERM, errors = 0, quiet = 0;
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| 68 | #if !ENABLE_KILLALL && !ENABLE_KILLALL5
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| 69 | #define killall 0
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| 70 | #define killall5 0
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[821] | 71 | #else
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[1765] | 72 | /* How to determine who we are? find 3rd char from the end:
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| 73 | * kill, killall, killall5
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| 74 | * ^i ^a ^l - it's unique
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| 75 | * (checking from the start is complicated by /bin/kill... case) */
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| 76 | const char char3 = argv[0][strlen(argv[0]) - 3];
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| 77 | #define killall (ENABLE_KILLALL && char3 == 'a')
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| 78 | #define killall5 (ENABLE_KILLALL5 && char3 == 'l')
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[821] | 79 | #endif
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| 80 |
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| 81 | /* Parse any options */
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[1765] | 82 | arg = *++argv;
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[821] | 83 |
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[3621] | 84 | if (!arg || arg[0] != '-') {
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[821] | 85 | goto do_it_now;
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| 86 | }
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| 87 |
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[1765] | 88 | /* The -l option, which prints out signal names.
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| 89 | * Intended usage in shell:
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| 90 | * echo "Died of SIG`kill -l $?`"
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| 91 | * We try to mimic what kill from coreutils-6.8 does */
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| 92 | if (arg[1] == 'l' && arg[2] == '\0') {
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[3621] | 93 | arg = *++argv;
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| 94 | if (!arg) {
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[821] | 95 | /* Print the whole signal list */
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[2725] | 96 | print_signames();
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| 97 | return 0;
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| 98 | }
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| 99 | /* -l <sig list> */
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[3621] | 100 | do {
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[2725] | 101 | if (isdigit(arg[0])) {
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| 102 | signo = bb_strtou(arg, NULL, 10);
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| 103 | if (errno) {
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| 104 | bb_error_msg("unknown signal '%s'", arg);
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| 105 | return EXIT_FAILURE;
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[821] | 106 | }
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[2725] | 107 | /* Exitcodes >= 0x80 are to be treated
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| 108 | * as "killed by signal (exitcode & 0x7f)" */
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| 109 | puts(get_signame(signo & 0x7f));
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| 110 | /* TODO: 'bad' signal# - coreutils says:
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| 111 | * kill: 127: invalid signal
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| 112 | * we just print "127" instead */
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| 113 | } else {
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| 114 | signo = get_signum(arg);
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| 115 | if (signo < 0) {
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| 116 | bb_error_msg("unknown signal '%s'", arg);
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| 117 | return EXIT_FAILURE;
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| 118 | }
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| 119 | printf("%d\n", signo);
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[821] | 120 | }
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[3621] | 121 | arg = *++argv;
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| 122 | } while (arg);
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[821] | 123 | return EXIT_SUCCESS;
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| 124 | }
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| 125 |
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| 126 | /* The -q quiet option */
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[1765] | 127 | if (killall && arg[1] == 'q' && arg[2] == '\0') {
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| 128 | quiet = 1;
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| 129 | arg = *++argv;
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[3621] | 130 | if (!arg)
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[2725] | 131 | bb_show_usage();
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| 132 | if (arg[0] != '-')
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| 133 | goto do_it_now;
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[821] | 134 | }
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| 135 |
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[2725] | 136 | arg++; /* skip '-' */
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| 137 |
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| 138 | /* -o PID? (if present, it always is at the end of command line) */
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| 139 | if (killall5 && arg[0] == 'o')
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| 140 | goto do_it_now;
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| 141 |
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[3621] | 142 | if (argv[1] && arg[0] == 's' && arg[1] == '\0') { /* -s SIG? */
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[2725] | 143 | arg = *++argv;
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| 144 | } /* else it must be -SIG */
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| 145 | signo = get_signum(arg);
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[1765] | 146 | if (signo < 0) { /* || signo > MAX_SIGNUM ? */
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[2725] | 147 | bb_error_msg("bad signal name '%s'", arg);
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[1765] | 148 | return EXIT_FAILURE;
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| 149 | }
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| 150 | arg = *++argv;
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[821] | 151 |
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[2725] | 152 | do_it_now:
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| 153 | pid = getpid();
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[821] | 154 |
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[1765] | 155 | if (killall5) {
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| 156 | pid_t sid;
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| 157 | procps_status_t* p = NULL;
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[3621] | 158 | /* compat: exitcode 2 is "no one was signaled" */
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| 159 | int ret = 2;
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[821] | 160 |
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[2725] | 161 | /* Find out our session id */
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| 162 | sid = getsid(pid);
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| 163 | /* Stop all processes */
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[3232] | 164 | if (signo != SIGSTOP && signo != SIGCONT)
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| 165 | kill(-1, SIGSTOP);
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[2725] | 166 | /* Signal all processes except those in our session */
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[3232] | 167 | while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID)) != NULL) {
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[3621] | 168 | char **args;
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[2725] | 169 |
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| 170 | if (p->sid == (unsigned)sid
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[3621] | 171 | || p->sid == 0 /* compat: kernel thread, don't signal it */
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[2725] | 172 | || p->pid == (unsigned)pid
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[3232] | 173 | || p->pid == 1
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| 174 | ) {
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[2725] | 175 | continue;
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[3232] | 176 | }
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[2725] | 177 |
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| 178 | /* All remaining args must be -o PID options.
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| 179 | * Check p->pid against them. */
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[3621] | 180 | args = argv;
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| 181 | while (*args) {
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[2725] | 182 | pid_t omit;
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| 183 |
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[3621] | 184 | arg = *args++;
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[2725] | 185 | if (arg[0] != '-' || arg[1] != 'o') {
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| 186 | bb_error_msg("bad option '%s'", arg);
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| 187 | ret = 1;
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| 188 | goto resume;
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| 189 | }
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| 190 | arg += 2;
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[3621] | 191 | if (!arg[0] && *args)
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| 192 | arg = *args++;
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[2725] | 193 | omit = bb_strtoi(arg, NULL, 10);
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| 194 | if (errno) {
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| 195 | bb_error_msg("invalid number '%s'", arg);
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| 196 | ret = 1;
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| 197 | goto resume;
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| 198 | }
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| 199 | if (p->pid == omit)
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| 200 | goto dont_kill;
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| 201 | }
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| 202 | kill(p->pid, signo);
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[3621] | 203 | ret = 0;
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[2725] | 204 | dont_kill: ;
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[821] | 205 | }
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[2725] | 206 | resume:
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[1765] | 207 | /* And let them continue */
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[3232] | 208 | if (signo != SIGSTOP && signo != SIGCONT)
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| 209 | kill(-1, SIGCONT);
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[2725] | 210 | return ret;
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[1765] | 211 | }
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[821] | 212 |
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[1765] | 213 | /* Pid or name is required for kill/killall */
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[3621] | 214 | if (!arg) {
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[2725] | 215 | bb_error_msg("you need to specify whom to kill");
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[1765] | 216 | return EXIT_FAILURE;
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[821] | 217 | }
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[1765] | 218 |
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| 219 | if (killall) {
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[821] | 220 | /* Looks like they want to do a killall. Do that */
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[3621] | 221 | do {
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[1765] | 222 | pid_t* pidList;
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[821] | 223 |
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[1765] | 224 | pidList = find_pid_by_name(arg);
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| 225 | if (*pidList == 0) {
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[821] | 226 | errors++;
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[1765] | 227 | if (!quiet)
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| 228 | bb_error_msg("%s: no process killed", arg);
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[821] | 229 | } else {
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[1765] | 230 | pid_t *pl;
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[821] | 231 |
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[1765] | 232 | for (pl = pidList; *pl; pl++) {
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| 233 | if (*pl == pid)
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[821] | 234 | continue;
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[1765] | 235 | if (kill(*pl, signo) == 0)
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| 236 | continue;
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| 237 | errors++;
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| 238 | if (!quiet)
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[2725] | 239 | bb_perror_msg("can't kill pid %d", (int)*pl);
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[821] | 240 | }
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| 241 | }
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| 242 | free(pidList);
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[1765] | 243 | arg = *++argv;
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[3621] | 244 | } while (arg);
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[1765] | 245 | return errors;
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[821] | 246 | }
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[1765] | 247 |
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| 248 | /* Looks like they want to do a kill. Do that */
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| 249 | while (arg) {
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[3232] | 250 | #if ENABLE_ASH || ENABLE_HUSH
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| 251 | /*
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| 252 | * We need to support shell's "hack formats" of
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| 253 | * " -PRGP_ID" (yes, with a leading space)
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| 254 | * and " PID1 PID2 PID3" (with degenerate case "")
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| 255 | */
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| 256 | while (*arg != '\0') {
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| 257 | char *end;
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| 258 | if (*arg == ' ')
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| 259 | arg++;
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| 260 | pid = bb_strtoi(arg, &end, 10);
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| 261 | if (errno && (errno != EINVAL || *end != ' ')) {
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| 262 | bb_error_msg("invalid number '%s'", arg);
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| 263 | errors++;
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| 264 | break;
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| 265 | }
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| 266 | if (kill(pid, signo) != 0) {
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| 267 | bb_perror_msg("can't kill pid %d", (int)pid);
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| 268 | errors++;
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| 269 | }
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| 270 | arg = end; /* can only point to ' ' or '\0' now */
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| 271 | }
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| 272 | #else
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[1765] | 273 | pid = bb_strtoi(arg, NULL, 10);
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| 274 | if (errno) {
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[2725] | 275 | bb_error_msg("invalid number '%s'", arg);
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[1765] | 276 | errors++;
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| 277 | } else if (kill(pid, signo) != 0) {
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[2725] | 278 | bb_perror_msg("can't kill pid %d", (int)pid);
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[1765] | 279 | errors++;
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| 280 | }
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[3232] | 281 | #endif
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[1765] | 282 | arg = *++argv;
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| 283 | }
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[821] | 284 | return errors;
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| 285 | }
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