[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
[1765] | 3 | * Mini kill/killall[5] implementation for busybox
|
---|
[821] | 4 | *
|
---|
| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
|
---|
| 6 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
---|
| 7 | *
|
---|
| 8 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
---|
| 9 | */
|
---|
| 10 |
|
---|
[1765] | 11 | #include "libbb.h"
|
---|
[821] | 12 |
|
---|
[1765] | 13 | /* Note: kill_main is directly called from shell in order to implement
|
---|
| 14 | * kill built-in. Shell substitutes job ids with process groups first.
|
---|
| 15 | *
|
---|
| 16 | * This brings some complications:
|
---|
| 17 | *
|
---|
| 18 | * + we can't use xfunc here
|
---|
| 19 | * + we can't use applet_name
|
---|
| 20 | * + we can't use bb_show_usage
|
---|
| 21 | * (Above doesn't apply for killall[5] cases)
|
---|
| 22 | *
|
---|
| 23 | * kill %n gets translated into kill ' -<process group>' by shell (note space!)
|
---|
| 24 | * This is needed to avoid collision with kill -9 ... syntax
|
---|
| 25 | */
|
---|
[821] | 26 |
|
---|
[1765] | 27 | int kill_main(int argc, char **argv);
|
---|
[821] | 28 | int kill_main(int argc, char **argv)
|
---|
| 29 | {
|
---|
[1765] | 30 | char *arg;
|
---|
| 31 | pid_t pid;
|
---|
| 32 | int signo = SIGTERM, errors = 0, quiet = 0;
|
---|
| 33 | #if !ENABLE_KILLALL && !ENABLE_KILLALL5
|
---|
| 34 | #define killall 0
|
---|
| 35 | #define killall5 0
|
---|
[821] | 36 | #else
|
---|
[1765] | 37 | /* How to determine who we are? find 3rd char from the end:
|
---|
| 38 | * kill, killall, killall5
|
---|
| 39 | * ^i ^a ^l - it's unique
|
---|
| 40 | * (checking from the start is complicated by /bin/kill... case) */
|
---|
| 41 | const char char3 = argv[0][strlen(argv[0]) - 3];
|
---|
| 42 | #define killall (ENABLE_KILLALL && char3 == 'a')
|
---|
| 43 | #define killall5 (ENABLE_KILLALL5 && char3 == 'l')
|
---|
[821] | 44 | #endif
|
---|
| 45 |
|
---|
| 46 | /* Parse any options */
|
---|
[1765] | 47 | argc--;
|
---|
| 48 | arg = *++argv;
|
---|
[821] | 49 |
|
---|
[1765] | 50 | if (argc < 1 || arg[0] != '-') {
|
---|
[821] | 51 | goto do_it_now;
|
---|
| 52 | }
|
---|
| 53 |
|
---|
[1765] | 54 | /* The -l option, which prints out signal names.
|
---|
| 55 | * Intended usage in shell:
|
---|
| 56 | * echo "Died of SIG`kill -l $?`"
|
---|
| 57 | * We try to mimic what kill from coreutils-6.8 does */
|
---|
| 58 | if (arg[1] == 'l' && arg[2] == '\0') {
|
---|
| 59 | if (argc == 1) {
|
---|
[821] | 60 | /* Print the whole signal list */
|
---|
[1765] | 61 | for (signo = 1; signo < 32; signo++) {
|
---|
| 62 | const char *name = get_signame(signo);
|
---|
| 63 | if (!isdigit(name[0]))
|
---|
| 64 | puts(name);
|
---|
| 65 | }
|
---|
| 66 | } else { /* -l <sig list> */
|
---|
| 67 | while ((arg = *++argv)) {
|
---|
| 68 | if (isdigit(arg[0])) {
|
---|
| 69 | signo = bb_strtou(arg, NULL, 10);
|
---|
| 70 | if (errno) {
|
---|
| 71 | bb_error_msg("unknown signal '%s'", arg);
|
---|
| 72 | return EXIT_FAILURE;
|
---|
| 73 | }
|
---|
| 74 | /* Exitcodes >= 0x80 are to be treated
|
---|
| 75 | * as "killed by signal (exitcode & 0x7f)" */
|
---|
| 76 | puts(get_signame(signo & 0x7f));
|
---|
| 77 | /* TODO: 'bad' signal# - coreutils says:
|
---|
| 78 | * kill: 127: invalid signal
|
---|
| 79 | * we just print "127" instead */
|
---|
| 80 | } else {
|
---|
| 81 | signo = get_signum(arg);
|
---|
| 82 | if (signo < 0) {
|
---|
| 83 | bb_error_msg("unknown signal '%s'", arg);
|
---|
| 84 | return EXIT_FAILURE;
|
---|
| 85 | }
|
---|
| 86 | printf("%d\n", signo);
|
---|
[821] | 87 | }
|
---|
| 88 | }
|
---|
| 89 | }
|
---|
[1765] | 90 | /* If they specified -l, we are all done */
|
---|
[821] | 91 | return EXIT_SUCCESS;
|
---|
| 92 | }
|
---|
| 93 |
|
---|
| 94 | /* The -q quiet option */
|
---|
[1765] | 95 | if (killall && arg[1] == 'q' && arg[2] == '\0') {
|
---|
| 96 | quiet = 1;
|
---|
| 97 | arg = *++argv;
|
---|
[821] | 98 | argc--;
|
---|
[1765] | 99 | if (argc < 1) bb_show_usage();
|
---|
| 100 | if (arg[0] != '-') goto do_it_now;
|
---|
[821] | 101 | }
|
---|
| 102 |
|
---|
[1765] | 103 | /* -SIG */
|
---|
| 104 | signo = get_signum(&arg[1]);
|
---|
| 105 | if (signo < 0) { /* || signo > MAX_SIGNUM ? */
|
---|
| 106 | bb_error_msg("bad signal name '%s'", &arg[1]);
|
---|
| 107 | return EXIT_FAILURE;
|
---|
| 108 | }
|
---|
| 109 | arg = *++argv;
|
---|
| 110 | argc--;
|
---|
[821] | 111 |
|
---|
| 112 | do_it_now:
|
---|
| 113 |
|
---|
[1765] | 114 | if (killall5) {
|
---|
| 115 | pid_t sid;
|
---|
| 116 | procps_status_t* p = NULL;
|
---|
[821] | 117 |
|
---|
[1765] | 118 | /* Now stop all processes */
|
---|
| 119 | kill(-1, SIGSTOP);
|
---|
| 120 | /* Find out our own session id */
|
---|
| 121 | pid = getpid();
|
---|
| 122 | sid = getsid(pid);
|
---|
| 123 | /* Now kill all processes except our session */
|
---|
| 124 | while ((p = procps_scan(p, PSSCAN_PID|PSSCAN_SID))) {
|
---|
| 125 | if (p->sid != sid && p->pid != pid && p->pid != 1)
|
---|
| 126 | kill(p->pid, signo);
|
---|
[821] | 127 | }
|
---|
[1765] | 128 | /* And let them continue */
|
---|
| 129 | kill(-1, SIGCONT);
|
---|
| 130 | return 0;
|
---|
| 131 | }
|
---|
[821] | 132 |
|
---|
[1765] | 133 | /* Pid or name is required for kill/killall */
|
---|
| 134 | if (argc < 1) {
|
---|
| 135 | puts("You need to specify whom to kill");
|
---|
| 136 | return EXIT_FAILURE;
|
---|
[821] | 137 | }
|
---|
[1765] | 138 |
|
---|
| 139 | if (killall) {
|
---|
[821] | 140 | /* Looks like they want to do a killall. Do that */
|
---|
[1765] | 141 | pid = getpid();
|
---|
| 142 | while (arg) {
|
---|
| 143 | pid_t* pidList;
|
---|
[821] | 144 |
|
---|
[1765] | 145 | pidList = find_pid_by_name(arg);
|
---|
| 146 | if (*pidList == 0) {
|
---|
[821] | 147 | errors++;
|
---|
[1765] | 148 | if (!quiet)
|
---|
| 149 | bb_error_msg("%s: no process killed", arg);
|
---|
[821] | 150 | } else {
|
---|
[1765] | 151 | pid_t *pl;
|
---|
[821] | 152 |
|
---|
[1765] | 153 | for (pl = pidList; *pl; pl++) {
|
---|
| 154 | if (*pl == pid)
|
---|
[821] | 155 | continue;
|
---|
[1765] | 156 | if (kill(*pl, signo) == 0)
|
---|
| 157 | continue;
|
---|
| 158 | errors++;
|
---|
| 159 | if (!quiet)
|
---|
| 160 | bb_perror_msg("cannot kill pid %u", (unsigned)*pl);
|
---|
[821] | 161 | }
|
---|
| 162 | }
|
---|
| 163 | free(pidList);
|
---|
[1765] | 164 | arg = *++argv;
|
---|
[821] | 165 | }
|
---|
[1765] | 166 | return errors;
|
---|
[821] | 167 | }
|
---|
[1765] | 168 |
|
---|
| 169 | /* Looks like they want to do a kill. Do that */
|
---|
| 170 | while (arg) {
|
---|
| 171 | /* Support shell 'space' trick */
|
---|
| 172 | if (arg[0] == ' ')
|
---|
| 173 | arg++;
|
---|
| 174 | pid = bb_strtoi(arg, NULL, 10);
|
---|
| 175 | if (errno) {
|
---|
| 176 | bb_error_msg("bad pid '%s'", arg);
|
---|
| 177 | errors++;
|
---|
| 178 | } else if (kill(pid, signo) != 0) {
|
---|
| 179 | bb_perror_msg("cannot kill pid %d", (int)pid);
|
---|
| 180 | errors++;
|
---|
| 181 | }
|
---|
| 182 | arg = *++argv;
|
---|
| 183 | }
|
---|
[821] | 184 | return errors;
|
---|
| 185 | }
|
---|