Contents of /tags/mkinitrd-6_1_4/busybox/procps/pgrep.c
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Wed Aug 5 16:25:39 2009 UTC (15 years, 1 month ago) by niro
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File size: 3418 byte(s)
Wed Aug 5 16:25:39 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 3418 byte(s)
tagged 'mkinitrd-6_1_4'
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 the GPL v2 or later, see the file LICENSE in this tarball. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | #include "xregex.h" |
12 | |
13 | /* Idea taken from kill.c */ |
14 | #define pgrep (ENABLE_PGREP && applet_name[1] == 'g') |
15 | #define pkill (ENABLE_PKILL && applet_name[1] == 'k') |
16 | |
17 | enum { |
18 | /* "vlfxon" */ |
19 | PGREPOPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */ |
20 | PGREPOPTBIT_L, |
21 | PGREPOPTBIT_F, |
22 | PGREPOPTBIT_X, |
23 | PGREPOPTBIT_O, |
24 | PGREPOPTBIT_N, |
25 | }; |
26 | |
27 | #define OPT_INVERT (opt & (1 << PGREPOPTBIT_V)) |
28 | #define OPT_LIST (opt & (1 << PGREPOPTBIT_L)) |
29 | #define OPT_FULL (opt & (1 << PGREPOPTBIT_F)) |
30 | #define OPT_ANCHOR (opt & (1 << PGREPOPTBIT_X)) |
31 | #define OPT_FIRST (opt & (1 << PGREPOPTBIT_O)) |
32 | #define OPT_LAST (opt & (1 << PGREPOPTBIT_N)) |
33 | |
34 | static void act(unsigned pid, char *cmd, int signo, unsigned opt) |
35 | { |
36 | if (pgrep) { |
37 | if (OPT_LIST) |
38 | printf("%d %s\n", pid, cmd); |
39 | else |
40 | printf("%d\n", pid); |
41 | } else |
42 | kill(pid, signo); |
43 | } |
44 | |
45 | int pgrep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
46 | int pgrep_main(int argc UNUSED_PARAM, char **argv) |
47 | { |
48 | unsigned pid = getpid(); |
49 | int signo = SIGTERM; |
50 | unsigned opt; |
51 | int scan_mask = PSSCAN_COMM; |
52 | char *first_arg; |
53 | int first_arg_idx; |
54 | int matched_pid; |
55 | char *cmd_last; |
56 | procps_status_t *proc; |
57 | /* These are initialized to 0 */ |
58 | struct { |
59 | regex_t re_buffer; |
60 | regmatch_t re_match[1]; |
61 | } Z; |
62 | #define re_buffer (Z.re_buffer) |
63 | #define re_match (Z.re_match ) |
64 | |
65 | memset(&Z, 0, sizeof(Z)); |
66 | |
67 | /* We must avoid interpreting -NUM (signal num) as an option */ |
68 | first_arg_idx = 1; |
69 | while (1) { |
70 | first_arg = argv[first_arg_idx]; |
71 | if (!first_arg) |
72 | break; |
73 | /* not "-<small_letter>..."? */ |
74 | if (first_arg[0] != '-' || first_arg[1] < 'a' || first_arg[1] > 'z') { |
75 | argv[first_arg_idx] = NULL; /* terminate argv here */ |
76 | break; |
77 | } |
78 | first_arg_idx++; |
79 | } |
80 | opt = getopt32(argv, "vlfxon"); |
81 | argv[first_arg_idx] = first_arg; |
82 | |
83 | argv += optind; |
84 | //argc -= optind; - unused anyway |
85 | if (OPT_FULL) |
86 | scan_mask |= PSSCAN_ARGVN; |
87 | |
88 | if (pkill) { |
89 | if (OPT_LIST) { /* -l: print the whole signal list */ |
90 | print_signames(); |
91 | return 0; |
92 | } |
93 | if (first_arg && first_arg[0] == '-') { |
94 | signo = get_signum(&first_arg[1]); |
95 | if (signo < 0) /* || signo > MAX_SIGNUM ? */ |
96 | bb_error_msg_and_die("bad signal name '%s'", &first_arg[1]); |
97 | argv++; |
98 | } |
99 | } |
100 | |
101 | /* One pattern is required */ |
102 | if (!argv[0] || argv[1]) |
103 | bb_show_usage(); |
104 | |
105 | xregcomp(&re_buffer, argv[0], 0); |
106 | matched_pid = 0; |
107 | cmd_last = NULL; |
108 | proc = NULL; |
109 | while ((proc = procps_scan(proc, scan_mask)) != NULL) { |
110 | char *cmd; |
111 | if (proc->pid == pid) |
112 | continue; |
113 | cmd = proc->argv0; |
114 | if (!cmd) { |
115 | cmd = proc->comm; |
116 | } else { |
117 | int i = proc->argv_len; |
118 | while (i) { |
119 | if (!cmd[i]) cmd[i] = ' '; |
120 | i--; |
121 | } |
122 | } |
123 | /* NB: OPT_INVERT is always 0 or 1 */ |
124 | if ((regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */ |
125 | && (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == (regoff_t)strlen(cmd)))) ^ OPT_INVERT |
126 | ) { |
127 | matched_pid = proc->pid; |
128 | if (OPT_LAST) { |
129 | free(cmd_last); |
130 | cmd_last = xstrdup(cmd); |
131 | continue; |
132 | } |
133 | act(proc->pid, cmd, signo, opt); |
134 | if (OPT_FIRST) |
135 | break; |
136 | } |
137 | } |
138 | if (cmd_last) { |
139 | act(matched_pid, cmd_last, signo, opt); |
140 | if (ENABLE_FEATURE_CLEAN_UP) |
141 | free(cmd_last); |
142 | } |
143 | return matched_pid == 0; /* return 1 if no processes listed/signaled */ |
144 | } |