xref: /openbmc/linux/tools/lib/api/fs/fs.h (revision f21e49be)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __API_FS__
3 #define __API_FS__
4 
5 #include <stdbool.h>
6 #include <unistd.h>
7 
8 /*
9  * On most systems <limits.h> would have given us this, but  not on some systems
10  * (e.g. GNU/Hurd).
11  */
12 #ifndef PATH_MAX
13 #define PATH_MAX 4096
14 #endif
15 
16 #define FS(name)				\
17 	const char *name##__mountpoint(void);	\
18 	const char *name##__mount(void);	\
19 	bool name##__configured(void);		\
20 
21 /*
22  * The xxxx__mountpoint() entry points find the first match mount point for each
23  * filesystems listed below, where xxxx is the filesystem type.
24  *
25  * The interface is as follows:
26  *
27  * - If a mount point is found on first call, it is cached and used for all
28  *   subsequent calls.
29  *
30  * - If a mount point is not found, NULL is returned on first call and all
31  *   subsequent calls.
32  */
33 FS(sysfs)
34 FS(procfs)
35 FS(debugfs)
36 FS(tracefs)
37 FS(hugetlbfs)
38 FS(bpf_fs)
39 
40 #undef FS
41 
42 
43 int cgroupfs_find_mountpoint(char *buf, size_t maxlen, const char *subsys);
44 
45 int filename__read_int(const char *filename, int *value);
46 int filename__read_ull(const char *filename, unsigned long long *value);
47 int filename__read_xll(const char *filename, unsigned long long *value);
48 int filename__read_str(const char *filename, char **buf, size_t *sizep);
49 
50 int filename__write_int(const char *filename, int value);
51 
52 int procfs__read_str(const char *entry, char **buf, size_t *sizep);
53 
54 int sysctl__read_int(const char *sysctl, int *value);
55 int sysfs__read_int(const char *entry, int *value);
56 int sysfs__read_ull(const char *entry, unsigned long long *value);
57 int sysfs__read_xll(const char *entry, unsigned long long *value);
58 int sysfs__read_str(const char *entry, char **buf, size_t *sizep);
59 int sysfs__read_bool(const char *entry, bool *value);
60 
61 int sysfs__write_int(const char *entry, int value);
62 #endif /* __API_FS__ */
63