[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini pgrep/pkill implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 2007 Loic Grenie <loic.grenie@gmail.com>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #include "libbb.h"
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| 10 | #include "xregex.h"
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| 11 |
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| 12 | /* Idea taken from kill.c */
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| 13 | #define pgrep (ENABLE_PGREP && applet_name[1] == 'g')
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| 14 | #define pkill (ENABLE_PKILL && applet_name[1] == 'k')
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| 15 |
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| 16 | enum {
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| 17 | /* "vlfxons:P:" */
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| 18 | OPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */
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| 19 | OPTBIT_L,
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| 20 | OPTBIT_F,
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| 21 | OPTBIT_X,
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| 22 | OPTBIT_O,
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| 23 | OPTBIT_N,
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| 24 | OPTBIT_S,
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| 25 | OPTBIT_P,
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| 26 | };
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| 27 |
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| 28 | #define OPT_INVERT (opt & (1 << OPTBIT_V))
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| 29 | #define OPT_LIST (opt & (1 << OPTBIT_L))
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| 30 | #define OPT_FULL (opt & (1 << OPTBIT_F))
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| 31 | #define OPT_ANCHOR (opt & (1 << OPTBIT_X))
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| 32 | #define OPT_FIRST (opt & (1 << OPTBIT_O))
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| 33 | #define OPT_LAST (opt & (1 << OPTBIT_N))
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| 34 | #define OPT_SID (opt & (1 << OPTBIT_S))
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| 35 | #define OPT_PPID (opt & (1 << OPTBIT_P))
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| 36 |
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| 37 | static void act(unsigned pid, char *cmd, int signo)
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| 38 | {
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| 39 | if (pgrep) {
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| 40 | if (option_mask32 & (1 << OPTBIT_L)) /* OPT_LIST */
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| 41 | printf("%d %s\n", pid, cmd);
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| 42 | else
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| 43 | printf("%d\n", pid);
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| 44 | } else
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| 45 | kill(pid, signo);
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| 46 | }
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| 47 |
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| 48 | int pgrep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 49 | int pgrep_main(int argc UNUSED_PARAM, char **argv)
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| 50 | {
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| 51 | unsigned pid;
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| 52 | int signo;
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| 53 | unsigned opt;
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| 54 | int scan_mask;
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| 55 | int matched_pid;
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| 56 | int sid2match, ppid2match;
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| 57 | char *cmd_last;
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| 58 | procps_status_t *proc;
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| 59 | /* These are initialized to 0 */
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| 60 | struct {
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| 61 | regex_t re_buffer;
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| 62 | regmatch_t re_match[1];
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| 63 | } Z;
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| 64 | #define re_buffer (Z.re_buffer)
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| 65 | #define re_match (Z.re_match )
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| 66 |
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| 67 | memset(&Z, 0, sizeof(Z));
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| 68 |
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| 69 | /* Parse -SIGNAL for pkill. Must be first option, if present */
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| 70 | signo = SIGTERM;
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| 71 | if (pkill && argv[1] && argv[1][0] == '-') {
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| 72 | int temp = get_signum(argv[1]+1);
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| 73 | if (temp != -1) {
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| 74 | signo = temp;
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| 75 | argv++;
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | /* Parse remaining options */
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| 80 | ppid2match = -1;
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| 81 | sid2match = -1;
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| 82 | opt_complementary = "s+:P+"; /* numeric opts */
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| 83 | opt = getopt32(argv, "vlfxons:P:", &sid2match, &ppid2match);
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| 84 | argv += optind;
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| 85 |
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| 86 | if (pkill && OPT_LIST) { /* -l: print the whole signal list */
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| 87 | print_signames();
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| 88 | return 0;
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| 89 | }
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| 90 |
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| 91 | pid = getpid();
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| 92 | if (sid2match == 0)
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| 93 | sid2match = getsid(pid);
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| 94 |
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| 95 | scan_mask = PSSCAN_COMM | PSSCAN_ARGV0;
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| 96 | if (OPT_FULL)
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| 97 | scan_mask |= PSSCAN_ARGVN;
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| 98 |
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| 99 | /* One pattern is required, if no -s and no -P */
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| 100 | if ((sid2match & ppid2match) < 0 && (!argv[0] || argv[1]))
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| 101 | bb_show_usage();
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| 102 |
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| 103 | if (argv[0])
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| 104 | xregcomp(&re_buffer, argv[0], 0);
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| 105 |
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| 106 | matched_pid = 0;
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| 107 | cmd_last = NULL;
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| 108 | proc = NULL;
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| 109 | while ((proc = procps_scan(proc, scan_mask)) != NULL) {
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| 110 | char *cmd;
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| 111 |
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| 112 | if (proc->pid == pid)
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| 113 | continue;
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| 114 |
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| 115 | cmd = proc->argv0;
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| 116 | if (!cmd) {
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| 117 | cmd = proc->comm;
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| 118 | } else {
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| 119 | int i = proc->argv_len;
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| 120 | while (--i >= 0) {
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| 121 | if ((unsigned char)cmd[i] < ' ')
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| 122 | cmd[i] = ' ';
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| 123 | }
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| 124 | }
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| 125 |
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| 126 | if (ppid2match >= 0 && ppid2match != proc->ppid)
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| 127 | continue;
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| 128 | if (sid2match >= 0 && sid2match != proc->sid)
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| 129 | continue;
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| 130 |
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| 131 | /* NB: OPT_INVERT is always 0 or 1 */
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| 132 | if (!argv[0]
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| 133 | || (regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */
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| 134 | && (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == (regoff_t)strlen(cmd)))
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| 135 | ) ^ OPT_INVERT
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| 136 | ) {
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| 137 | matched_pid = proc->pid;
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| 138 | if (OPT_LAST) {
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| 139 | free(cmd_last);
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| 140 | cmd_last = xstrdup(cmd);
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| 141 | continue;
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| 142 | }
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| 143 | act(proc->pid, cmd, signo);
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| 144 | if (OPT_FIRST)
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| 145 | break;
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| 146 | }
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| 147 | }
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| 148 |
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| 149 | if (cmd_last) {
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| 150 | act(matched_pid, cmd_last, signo);
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| 151 | if (ENABLE_FEATURE_CLEAN_UP)
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| 152 | free(cmd_last);
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| 153 | }
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| 154 | return matched_pid == 0; /* return 1 if no processes listed/signaled */
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| 155 | }
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