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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
88a60da0 | 2 | /*** |
88a60da0 | 3 | Copyright 2010 Lennart Poettering |
88a60da0 KS |
4 | ***/ |
5 | ||
521251d2 MG |
6 | #include <errno.h> |
7 | #include <fcntl.h> | |
3f6fd1ba | 8 | #include <stdio.h> |
3f6fd1ba | 9 | #include <string.h> |
521251d2 | 10 | #include <unistd.h> |
88a60da0 | 11 | |
521251d2 | 12 | #include "fd-util.h" |
3f6fd1ba | 13 | #include "fileio.h" |
88a60da0 | 14 | #include "log.h" |
a8fbdf54 | 15 | #include "macro.h" |
07630cea | 16 | #include "string-util.h" |
88a60da0 KS |
17 | #include "sysctl-util.h" |
18 | ||
19 | char *sysctl_normalize(char *s) { | |
20 | char *n; | |
21 | ||
22 | n = strpbrk(s, "/."); | |
23 | /* If the first separator is a slash, the path is | |
24 | * assumed to be normalized and slashes remain slashes | |
25 | * and dots remains dots. */ | |
26 | if (!n || *n == '/') | |
27 | return s; | |
28 | ||
29 | /* Otherwise, dots become slashes and slashes become | |
30 | * dots. Fun. */ | |
31 | while (n) { | |
32 | if (*n == '.') | |
33 | *n = '/'; | |
34 | else | |
35 | *n = '.'; | |
36 | ||
37 | n = strpbrk(n + 1, "/."); | |
38 | } | |
39 | ||
40 | return s; | |
41 | } | |
42 | ||
43 | int sysctl_write(const char *property, const char *value) { | |
0f5a8be5 | 44 | char *p; |
521251d2 | 45 | _cleanup_close_ int fd = -1; |
88a60da0 | 46 | |
0f5a8be5 LP |
47 | assert(property); |
48 | assert(value); | |
88a60da0 | 49 | |
0f5a8be5 | 50 | log_debug("Setting '%s' to '%s'", property, value); |
88a60da0 | 51 | |
0f5a8be5 | 52 | p = strjoina("/proc/sys/", property); |
521251d2 MG |
53 | fd = open(p, O_WRONLY|O_CLOEXEC); |
54 | if (fd < 0) | |
55 | return -errno; | |
56 | ||
57 | if (!endswith(value, "\n")) | |
58 | value = strjoina(value, "\n"); | |
59 | ||
60 | if (write(fd, value, strlen(value)) < 0) | |
61 | return -errno; | |
62 | ||
63 | return 0; | |
88a60da0 KS |
64 | } |
65 | ||
66 | int sysctl_read(const char *property, char **content) { | |
0f5a8be5 | 67 | char *p; |
88a60da0 | 68 | |
0f5a8be5 LP |
69 | assert(property); |
70 | assert(content); | |
88a60da0 | 71 | |
0f5a8be5 | 72 | p = strjoina("/proc/sys/", property); |
88a60da0 KS |
73 | return read_full_file(p, content, NULL); |
74 | } |