| 1 | /* vi: set sw=4 ts=4: */
|
|---|
| 2 | /*
|
|---|
| 3 | * Mini pgrep/pkill implementation for busybox
|
|---|
| 4 | *
|
|---|
| 5 | * Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
|
|---|
| 6 | *
|
|---|
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|---|
| 8 | */
|
|---|
| 9 | #include "libbb.h"
|
|---|
| 10 | #include "xregex.h"
|
|---|
| 11 |
|
|---|
| 12 | /* Idea taken from kill.c */
|
|---|
| 13 | #define pgrep (ENABLE_PGREP && applet_name[1] == 'g')
|
|---|
| 14 | #define pkill (ENABLE_PKILL && applet_name[1] == 'k')
|
|---|
| 15 |
|
|---|
| 16 | enum {
|
|---|
| 17 | /* "vlfxons:P:" */
|
|---|
| 18 | OPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */
|
|---|
| 19 | OPTBIT_L,
|
|---|
| 20 | OPTBIT_F,
|
|---|
| 21 | OPTBIT_X,
|
|---|
| 22 | OPTBIT_O,
|
|---|
| 23 | OPTBIT_N,
|
|---|
| 24 | OPTBIT_S,
|
|---|
| 25 | OPTBIT_P,
|
|---|
| 26 | };
|
|---|
| 27 |
|
|---|
| 28 | #define OPT_INVERT (opt & (1 << OPTBIT_V))
|
|---|
| 29 | #define OPT_LIST (opt & (1 << OPTBIT_L))
|
|---|
| 30 | #define OPT_FULL (opt & (1 << OPTBIT_F))
|
|---|
| 31 | #define OPT_ANCHOR (opt & (1 << OPTBIT_X))
|
|---|
| 32 | #define OPT_FIRST (opt & (1 << OPTBIT_O))
|
|---|
| 33 | #define OPT_LAST (opt & (1 << OPTBIT_N))
|
|---|
| 34 | #define OPT_SID (opt & (1 << OPTBIT_S))
|
|---|
| 35 | #define OPT_PPID (opt & (1 << OPTBIT_P))
|
|---|
| 36 |
|
|---|
| 37 | static void act(unsigned pid, char *cmd, int signo)
|
|---|
| 38 | {
|
|---|
| 39 | if (pgrep) {
|
|---|
| 40 | if (option_mask32 & (1 << OPTBIT_L)) /* OPT_LIST */
|
|---|
| 41 | printf("%d %s\n", pid, cmd);
|
|---|
| 42 | else
|
|---|
| 43 | printf("%d\n", pid);
|
|---|
| 44 | } else
|
|---|
| 45 | kill(pid, signo);
|
|---|
| 46 | }
|
|---|
| 47 |
|
|---|
| 48 | int pgrep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 49 | int pgrep_main(int argc UNUSED_PARAM, char **argv)
|
|---|
| 50 | {
|
|---|
| 51 | unsigned pid;
|
|---|
| 52 | int signo;
|
|---|
| 53 | unsigned opt;
|
|---|
| 54 | int scan_mask;
|
|---|
| 55 | int matched_pid;
|
|---|
| 56 | int sid2match, ppid2match;
|
|---|
| 57 | char *cmd_last;
|
|---|
| 58 | procps_status_t *proc;
|
|---|
| 59 | /* These are initialized to 0 */
|
|---|
| 60 | struct {
|
|---|
| 61 | regex_t re_buffer;
|
|---|
| 62 | regmatch_t re_match[1];
|
|---|
| 63 | } Z;
|
|---|
| 64 | #define re_buffer (Z.re_buffer)
|
|---|
| 65 | #define re_match (Z.re_match )
|
|---|
| 66 |
|
|---|
| 67 | memset(&Z, 0, sizeof(Z));
|
|---|
| 68 |
|
|---|
| 69 | /* Parse -SIGNAL for pkill. Must be first option, if present */
|
|---|
| 70 | signo = SIGTERM;
|
|---|
| 71 | if (pkill && argv[1] && argv[1][0] == '-') {
|
|---|
| 72 | int temp = get_signum(argv[1]+1);
|
|---|
| 73 | if (temp != -1) {
|
|---|
| 74 | signo = temp;
|
|---|
| 75 | argv++;
|
|---|
| 76 | }
|
|---|
| 77 | }
|
|---|
| 78 |
|
|---|
| 79 | /* Parse remaining options */
|
|---|
| 80 | ppid2match = -1;
|
|---|
| 81 | sid2match = -1;
|
|---|
| 82 | opt_complementary = "s+:P+"; /* numeric opts */
|
|---|
| 83 | opt = getopt32(argv, "vlfxons:P:", &sid2match, &ppid2match);
|
|---|
| 84 | argv += optind;
|
|---|
| 85 |
|
|---|
| 86 | if (pkill && OPT_LIST) { /* -l: print the whole signal list */
|
|---|
| 87 | print_signames();
|
|---|
| 88 | return 0;
|
|---|
| 89 | }
|
|---|
| 90 |
|
|---|
| 91 | pid = getpid();
|
|---|
| 92 | if (sid2match == 0)
|
|---|
| 93 | sid2match = getsid(pid);
|
|---|
| 94 |
|
|---|
| 95 | scan_mask = PSSCAN_COMM | PSSCAN_ARGV0;
|
|---|
| 96 | if (OPT_FULL)
|
|---|
| 97 | scan_mask |= PSSCAN_ARGVN;
|
|---|
| 98 |
|
|---|
| 99 | /* One pattern is required, if no -s and no -P */
|
|---|
| 100 | if ((sid2match & ppid2match) < 0 && (!argv[0] || argv[1]))
|
|---|
| 101 | bb_show_usage();
|
|---|
| 102 |
|
|---|
| 103 | if (argv[0])
|
|---|
| 104 | xregcomp(&re_buffer, argv[0], 0);
|
|---|
| 105 |
|
|---|
| 106 | matched_pid = 0;
|
|---|
| 107 | cmd_last = NULL;
|
|---|
| 108 | proc = NULL;
|
|---|
| 109 | while ((proc = procps_scan(proc, scan_mask)) != NULL) {
|
|---|
| 110 | char *cmd;
|
|---|
| 111 |
|
|---|
| 112 | if (proc->pid == pid)
|
|---|
| 113 | continue;
|
|---|
| 114 |
|
|---|
| 115 | cmd = proc->argv0;
|
|---|
| 116 | if (!cmd) {
|
|---|
| 117 | cmd = proc->comm;
|
|---|
| 118 | } else {
|
|---|
| 119 | int i = proc->argv_len;
|
|---|
| 120 | while (--i >= 0) {
|
|---|
| 121 | if ((unsigned char)cmd[i] < ' ')
|
|---|
| 122 | cmd[i] = ' ';
|
|---|
| 123 | }
|
|---|
| 124 | }
|
|---|
| 125 |
|
|---|
| 126 | if (ppid2match >= 0 && ppid2match != proc->ppid)
|
|---|
| 127 | continue;
|
|---|
| 128 | if (sid2match >= 0 && sid2match != proc->sid)
|
|---|
| 129 | continue;
|
|---|
| 130 |
|
|---|
| 131 | /* NB: OPT_INVERT is always 0 or 1 */
|
|---|
| 132 | if (!argv[0]
|
|---|
| 133 | || (regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */
|
|---|
| 134 | && (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == (regoff_t)strlen(cmd)))
|
|---|
| 135 | ) ^ OPT_INVERT
|
|---|
| 136 | ) {
|
|---|
| 137 | matched_pid = proc->pid;
|
|---|
| 138 | if (OPT_LAST) {
|
|---|
| 139 | free(cmd_last);
|
|---|
| 140 | cmd_last = xstrdup(cmd);
|
|---|
| 141 | continue;
|
|---|
| 142 | }
|
|---|
| 143 | act(proc->pid, cmd, signo);
|
|---|
| 144 | if (OPT_FIRST)
|
|---|
| 145 | break;
|
|---|
| 146 | }
|
|---|
| 147 | }
|
|---|
| 148 |
|
|---|
| 149 | if (cmd_last) {
|
|---|
| 150 | act(matched_pid, cmd_last, signo);
|
|---|
| 151 | if (ENABLE_FEATURE_CLEAN_UP)
|
|---|
| 152 | free(cmd_last);
|
|---|
| 153 | }
|
|---|
| 154 | return matched_pid == 0; /* return 1 if no processes listed/signaled */
|
|---|
| 155 | }
|
|---|
