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e3bff60a MP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
6300502b | 20 | #include <stdio.h> |
6300502b | 21 | #include <string.h> |
e3bff60a | 22 | |
6300502b | 23 | #include "fileio.h" |
e3bff60a | 24 | #include "log.h" |
4c89c718 | 25 | #include "macro.h" |
db2df898 | 26 | #include "string-util.h" |
e3bff60a MP |
27 | #include "sysctl-util.h" |
28 | ||
29 | char *sysctl_normalize(char *s) { | |
30 | char *n; | |
31 | ||
32 | n = strpbrk(s, "/."); | |
33 | /* If the first separator is a slash, the path is | |
34 | * assumed to be normalized and slashes remain slashes | |
35 | * and dots remains dots. */ | |
36 | if (!n || *n == '/') | |
37 | return s; | |
38 | ||
39 | /* Otherwise, dots become slashes and slashes become | |
40 | * dots. Fun. */ | |
41 | while (n) { | |
42 | if (*n == '.') | |
43 | *n = '/'; | |
44 | else | |
45 | *n = '.'; | |
46 | ||
47 | n = strpbrk(n + 1, "/."); | |
48 | } | |
49 | ||
50 | return s; | |
51 | } | |
52 | ||
53 | int sysctl_write(const char *property, const char *value) { | |
54 | char *p; | |
55 | ||
56 | assert(property); | |
57 | assert(value); | |
58 | ||
59 | log_debug("Setting '%s' to '%s'", property, value); | |
60 | ||
61 | p = strjoina("/proc/sys/", property); | |
7035cd9e | 62 | return write_string_file(p, value, 0); |
e3bff60a MP |
63 | } |
64 | ||
65 | int sysctl_read(const char *property, char **content) { | |
66 | char *p; | |
67 | ||
68 | assert(property); | |
69 | assert(content); | |
70 | ||
71 | p = strjoina("/proc/sys/", property); | |
72 | return read_full_file(p, content, NULL); | |
73 | } |