1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/* vi: set sw=4 ts=4:
*
* pidof.c - Print the PIDs of all processes with the given names.
*
* Copyright 2012 Andreas Heck <aheck@gmx.de>
*
* Not in SUSv4.
* See http://opengroup.org/onlinepubs/9699919799/utilities/
USE_PIDOF(NEWTOY(pidof, "e@d*c#b:a", TOYFLAG_USR|TOYFLAG_BIN))
config PIDOF
bool "pidof"
default y
help
usage: pidof [NAME]...
Print the PIDs of all processes with the given names.
*/
#include "toys.h"
#define TT this.pidof
#define PATH_LEN 64
#define PROC_DIR "/proc/"
#define CMD_LINE "/cmdline"
static int matched = 0;
static int for_each_pid(void (*callback) (const char *pid)) {
DIR *dp;
struct dirent *entry;
FILE *fp;
int n, pathpos;
char cmd[PATH_MAX];
char path[PATH_LEN];
char **curname;
dp = opendir(PROC_DIR);
if (!dp) {
perror("opendir");
return 1;
}
while ((entry = readdir(dp))) {
if (!isdigit(entry->d_name[0])) continue;
strcpy(path, PROC_DIR);
pathpos = strlen(PROC_DIR);
if (pathpos + strlen(entry->d_name) + 1 > PATH_LEN) continue;
strcpy(&path[pathpos], entry->d_name);
pathpos += strlen(entry->d_name);
if (pathpos + strlen(CMD_LINE) + 1 > PATH_LEN) continue;
strcpy(&path[pathpos], CMD_LINE);
fp = fopen(path, "r");
if (!fp) {
perror("fopen");
continue;
}
n = fread(cmd, 1, PATH_MAX, fp);
fclose(fp);
if (n == 0) continue;
for (curname = toys.optargs; *curname; curname++) {
if (strcmp(basename(cmd), *curname) == 0) {
callback(entry->d_name);
}
}
}
closedir(dp);
return 0;
}
static void print_pid (const char *pid) {
if (matched) putchar(' ');
fputs(pid, stdout);
matched = 1;
}
void pidof_main(void)
{
int err;
if (!toys.optargs) exit(1);
err = for_each_pid(print_pid);
if (err) exit(1);
if (!matched)
exit(1);
else
putchar('\n');
}
|
