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6dbe3af9 KZ |
1 | /* |
2 | * procs.c -- functions to parse the linux /proc filesystem. | |
3 | * (c) 1994 salvatore valente <svalente@mit.edu> | |
4 | * | |
5 | * this program is free software. you can redistribute it and | |
6 | * modify it under the terms of the gnu general public license. | |
7 | * there is no warranty. | |
8 | * | |
5c36a0eb KZ |
9 | * faith |
10 | * 1.2 | |
11 | * 1995/02/23 01:20:40 | |
6dbe3af9 KZ |
12 | * |
13 | */ | |
14 | ||
15 | #define _POSIX_SOURCE 1 | |
16 | ||
66ee8158 KZ |
17 | #include <sys/types.h> |
18 | #include <sys/stat.h> | |
6dbe3af9 KZ |
19 | #include <stdio.h> |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <dirent.h> | |
23 | #include <ctype.h> | |
24 | #include <unistd.h> | |
22853e4a | 25 | #include "kill.h" |
6dbe3af9 KZ |
26 | |
27 | extern char *mybasename (char *); | |
28 | static char *parse_parens (char *buf); | |
29 | ||
22853e4a KZ |
30 | int * |
31 | get_pids (char *process_name, int get_all) { | |
6dbe3af9 KZ |
32 | DIR *dir; |
33 | struct dirent *ent; | |
34 | int status; | |
35 | char *dname, fname[100], *cp, buf[256]; | |
36 | struct stat st; | |
37 | uid_t uid; | |
38 | FILE *fp; | |
39 | int pid, *pids, num_pids, pids_size; | |
40 | ||
41 | dir = opendir ("/proc"); | |
42 | if (! dir) { | |
43 | perror ("opendir /proc"); | |
44 | return NULL; | |
45 | } | |
46 | uid = getuid (); | |
47 | pids = NULL; | |
48 | num_pids = pids_size = 0; | |
49 | ||
50 | while ((ent = readdir (dir)) != NULL) { | |
51 | dname = ent->d_name; | |
52 | if (! isdigit (*dname)) continue; | |
53 | pid = atoi (dname); | |
54 | sprintf (fname, "/proc/%d/cmdline", pid); | |
55 | /* get the process owner */ | |
56 | status = stat (fname, &st); | |
57 | if (status != 0) continue; | |
58 | if (! get_all && uid != st.st_uid) continue; | |
59 | /* get the command line */ | |
60 | fp = fopen (fname, "r"); | |
61 | if (! fp) continue; | |
62 | cp = fgets (buf, sizeof (buf), fp); | |
63 | fclose (fp); | |
64 | /* an empty command line means the process is swapped out */ | |
65 | if (! cp || ! *cp) { | |
66 | /* get the process name from the statfile */ | |
67 | sprintf (fname, "/proc/%d/stat", pid); | |
68 | fp = fopen (fname, "r"); | |
69 | if (! fp) continue; | |
70 | cp = fgets (buf, sizeof (buf), fp); | |
71 | if (cp == NULL) continue; | |
72 | fclose (fp); | |
73 | cp = parse_parens (buf); | |
74 | if (cp == NULL) continue; | |
75 | } | |
76 | /* ok, we got the process name. */ | |
77 | if (strcmp (process_name, mybasename (cp))) continue; | |
78 | while (pids_size < num_pids + 2) { | |
79 | pids_size += 5; | |
80 | pids = (int *) realloc (pids, sizeof (int) * pids_size); | |
81 | } | |
82 | pids[num_pids++] = pid; | |
83 | pids[num_pids] = -1; | |
84 | } | |
85 | closedir (dir); | |
86 | return (pids); | |
87 | } | |
88 | ||
89 | /* | |
90 | * parse_parens () -- return an index just past the first open paren in | |
91 | * buf, and terminate the string at the matching close paren. | |
92 | */ | |
93 | static char *parse_parens (char *buf) | |
94 | { | |
95 | char *cp, *ip; | |
96 | int depth; | |
97 | ||
98 | cp = strchr (buf, '('); | |
99 | if (cp == NULL) return NULL; | |
100 | cp++; | |
101 | depth = 1; | |
102 | for (ip = cp; *ip; ip++) { | |
103 | if (*ip == '(') | |
104 | depth++; | |
105 | if (*ip == ')') { | |
106 | depth--; | |
107 | if (depth == 0) { | |
108 | *ip = 0; | |
109 | break; | |
110 | } | |
111 | } | |
112 | } | |
113 | return cp; | |
114 | } | |
fd6b7a7f | 115 | |
fd6b7a7f KZ |
116 | char *mybasename (char *path) |
117 | { | |
118 | char *cp; | |
119 | ||
120 | cp = strrchr (path, '/'); | |
121 | return (cp ? cp + 1 : path); | |
122 | } | |
5c36a0eb | 123 |