blob: 4ab458be132c31810a0d746590c3918b9fb50ef3
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 | |
10 | //usage:#define pgrep_trivial_usage |
11 | //usage: "[-flnovx] [-s SID|-P PPID|PATTERN]" |
12 | //usage:#define pgrep_full_usage "\n\n" |
13 | //usage: "Display process(es) selected by regex PATTERN\n" |
14 | //usage: "\n -l Show command name too" |
15 | //usage: "\n -f Match against entire command line" |
16 | //usage: "\n -n Show the newest process only" |
17 | //usage: "\n -o Show the oldest process only" |
18 | //usage: "\n -v Negate the match" |
19 | //usage: "\n -x Match whole name (not substring)" |
20 | //usage: "\n -s Match session ID (0 for current)" |
21 | //usage: "\n -P Match parent process ID" |
22 | //usage: |
23 | //usage:#define pkill_trivial_usage |
24 | //usage: "[-l|-SIGNAL] [-fnovx] [-s SID|-P PPID|PATTERN]" |
25 | //usage:#define pkill_full_usage "\n\n" |
26 | //usage: "Send a signal to process(es) selected by regex PATTERN\n" |
27 | //usage: "\n -l List all signals" |
28 | //usage: "\n -f Match against entire command line" |
29 | //usage: "\n -n Signal the newest process only" |
30 | //usage: "\n -o Signal the oldest process only" |
31 | //usage: "\n -v Negate the match" |
32 | //usage: "\n -x Match whole name (not substring)" |
33 | //usage: "\n -s Match session ID (0 for current)" |
34 | //usage: "\n -P Match parent process ID" |
35 | |
36 | #include "libbb.h" |
37 | #include "xregex.h" |
38 | |
39 | /* Idea taken from kill.c */ |
40 | #define pgrep (ENABLE_PGREP && applet_name[1] == 'g') |
41 | #define pkill (ENABLE_PKILL && applet_name[1] == 'k') |
42 | |
43 | enum { |
44 | /* "vlfxons:P:" */ |
45 | OPTBIT_V = 0, /* must be first, we need OPT_INVERT = 0/1 */ |
46 | OPTBIT_L, |
47 | OPTBIT_F, |
48 | OPTBIT_X, |
49 | OPTBIT_O, |
50 | OPTBIT_N, |
51 | OPTBIT_S, |
52 | OPTBIT_P, |
53 | }; |
54 | |
55 | #define OPT_INVERT (opt & (1 << OPTBIT_V)) |
56 | #define OPT_LIST (opt & (1 << OPTBIT_L)) |
57 | #define OPT_FULL (opt & (1 << OPTBIT_F)) |
58 | #define OPT_ANCHOR (opt & (1 << OPTBIT_X)) |
59 | #define OPT_FIRST (opt & (1 << OPTBIT_O)) |
60 | #define OPT_LAST (opt & (1 << OPTBIT_N)) |
61 | #define OPT_SID (opt & (1 << OPTBIT_S)) |
62 | #define OPT_PPID (opt & (1 << OPTBIT_P)) |
63 | |
64 | static void act(unsigned pid, char *cmd, int signo) |
65 | { |
66 | if (pgrep) { |
67 | if (option_mask32 & (1 << OPTBIT_L)) /* OPT_LIST */ |
68 | printf("%u %s\n", pid, cmd); |
69 | else |
70 | printf("%u\n", pid); |
71 | } else |
72 | kill(pid, signo); |
73 | } |
74 | |
75 | int pgrep_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
76 | int pgrep_main(int argc UNUSED_PARAM, char **argv) |
77 | { |
78 | unsigned pid; |
79 | int signo; |
80 | unsigned opt; |
81 | int scan_mask; |
82 | int matched_pid; |
83 | int sid2match, ppid2match; |
84 | char *cmd_last; |
85 | procps_status_t *proc; |
86 | /* These are initialized to 0 */ |
87 | struct { |
88 | regex_t re_buffer; |
89 | regmatch_t re_match[1]; |
90 | } Z; |
91 | #define re_buffer (Z.re_buffer) |
92 | #define re_match (Z.re_match ) |
93 | |
94 | memset(&Z, 0, sizeof(Z)); |
95 | |
96 | /* Parse -SIGNAL for pkill. Must be first option, if present */ |
97 | signo = SIGTERM; |
98 | if (pkill && argv[1] && argv[1][0] == '-') { |
99 | int temp = get_signum(argv[1]+1); |
100 | if (temp != -1) { |
101 | signo = temp; |
102 | argv++; |
103 | } |
104 | } |
105 | |
106 | /* Parse remaining options */ |
107 | ppid2match = -1; |
108 | sid2match = -1; |
109 | opt_complementary = "s+:P+"; /* numeric opts */ |
110 | opt = getopt32(argv, "vlfxons:P:", &sid2match, &ppid2match); |
111 | argv += optind; |
112 | |
113 | if (pkill && OPT_LIST) { /* -l: print the whole signal list */ |
114 | print_signames(); |
115 | return 0; |
116 | } |
117 | |
118 | pid = getpid(); |
119 | if (sid2match == 0) |
120 | sid2match = getsid(pid); |
121 | |
122 | scan_mask = PSSCAN_COMM | PSSCAN_ARGV0; |
123 | if (OPT_FULL) |
124 | scan_mask |= PSSCAN_ARGVN; |
125 | |
126 | /* One pattern is required, if no -s and no -P */ |
127 | if ((sid2match & ppid2match) < 0 && (!argv[0] || argv[1])) |
128 | bb_show_usage(); |
129 | |
130 | if (argv[0]) |
131 | xregcomp(&re_buffer, argv[0], OPT_ANCHOR ? REG_EXTENDED : (REG_EXTENDED|REG_NOSUB)); |
132 | |
133 | matched_pid = 0; |
134 | cmd_last = NULL; |
135 | proc = NULL; |
136 | while ((proc = procps_scan(proc, scan_mask)) != NULL) { |
137 | char *cmd; |
138 | |
139 | if (proc->pid == pid) |
140 | continue; |
141 | |
142 | cmd = proc->argv0; |
143 | if (!cmd) { |
144 | cmd = proc->comm; |
145 | } else { |
146 | int i = proc->argv_len; |
147 | while (--i >= 0) { |
148 | if ((unsigned char)cmd[i] < ' ') |
149 | cmd[i] = ' '; |
150 | } |
151 | } |
152 | |
153 | if (ppid2match >= 0 && (pid_t) ppid2match != (pid_t) proc->ppid) |
154 | continue; |
155 | if (sid2match >= 0 && sid2match != (int) proc->sid) |
156 | continue; |
157 | |
158 | /* NB: OPT_INVERT is always 0 or 1 */ |
159 | if (!argv[0] |
160 | || (regexec(&re_buffer, cmd, 1, re_match, 0) == 0 /* match found */ |
161 | && (!OPT_ANCHOR || (re_match[0].rm_so == 0 && re_match[0].rm_eo == (regoff_t)strlen(cmd))) |
162 | ) ^ OPT_INVERT |
163 | ) { |
164 | matched_pid = proc->pid; |
165 | if (OPT_LAST) { |
166 | free(cmd_last); |
167 | cmd_last = xstrdup(cmd); |
168 | continue; |
169 | } |
170 | act(proc->pid, cmd, signo); |
171 | if (OPT_FIRST) |
172 | break; |
173 | } |
174 | } |
175 | |
176 | if (cmd_last) { |
177 | act(matched_pid, cmd_last, signo); |
178 | if (ENABLE_FEATURE_CLEAN_UP) |
179 | free(cmd_last); |
180 | } |
181 | return matched_pid == 0; /* return 1 if no processes listed/signaled */ |
182 | } |
183 |