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