Contents of /tags/mkinitrd-6_2_3/busybox/procps/pgrep.c
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Mon May 31 20:54:44 2010 UTC (14 years ago) by niro
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File size: 3498 byte(s)
Mon May 31 20:54:44 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 3498 byte(s)
tagged 'mkinitrd-6_2_3'
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 | #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)))) ^ OPT_INVERT |
135 | ) { |
136 | matched_pid = proc->pid; |
137 | if (OPT_LAST) { |
138 | free(cmd_last); |
139 | cmd_last = xstrdup(cmd); |
140 | continue; |
141 | } |
142 | act(proc->pid, cmd, signo); |
143 | if (OPT_FIRST) |
144 | break; |
145 | } |
146 | } |
147 | |
148 | if (cmd_last) { |
149 | act(matched_pid, cmd_last, signo); |
150 | if (ENABLE_FEATURE_CLEAN_UP) |
151 | free(cmd_last); |
152 | } |
153 | return matched_pid == 0; /* return 1 if no processes listed/signaled */ |
154 | } |