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
|
/*
* Copyright (C) 2026 Daniel Golle <daniel@makrotopia.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libubox/utils.h>
#include "cgroup.h"
int cgroup_join(const char *path)
{
char procs[256], dir[256];
struct stat sb;
int fd, ret;
if (stat("/sys/fs/cgroup/cgroup.subtree_control", &sb))
return 0;
ret = snprintf(procs, sizeof(procs), "%s/cgroup.procs", path);
if (ret < 0 || (size_t)ret >= sizeof(procs))
return -ENAMETOOLONG;
snprintf(dir, sizeof(dir), "%s", path);
if (mkdir_p(dir, 0700))
return -EPERM;
fd = open(procs, O_WRONLY);
if (fd == -1)
return -EIO;
ret = dprintf(fd, "%d", getpid());
close(fd);
if (ret < 0)
return -EIO;
return 0;
}
int cgroup_kill(const char *path)
{
char kill_path[256];
int fd, ret;
ret = snprintf(kill_path, sizeof(kill_path), "%s/cgroup.kill", path);
if (ret < 0 || (size_t)ret >= sizeof(kill_path))
return -ENAMETOOLONG;
fd = open(kill_path, O_WRONLY);
if (fd < 0)
return 0;
ret = (write(fd, "1", 1) < 0) ? -errno : 0;
close(fd);
return ret;
}
bool cgroup_populated(int fd)
{
char buf[128];
ssize_t len;
char *val;
if (lseek(fd, 0, SEEK_SET) < 0)
return false;
len = read(fd, buf, sizeof(buf) - 1);
if (len <= 0)
return false;
buf[len] = '\0';
val = strstr(buf, "populated ");
if (!val)
return false;
return val[strlen("populated ")] == '1';
}
|
