63 lines · c
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 systems10 * (e.g. GNU/Hurd).11 */12#ifndef PATH_MAX13#define PATH_MAX 409614#endif15 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 each23 * 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 all28 * subsequent calls.29 *30 * - If a mount point is not found, NULL is returned on first call and all31 * subsequent calls.32 */33FS(sysfs)34FS(procfs)35FS(debugfs)36FS(tracefs)37FS(hugetlbfs)38FS(bpf_fs)39 40#undef FS41 42 43int cgroupfs_find_mountpoint(char *buf, size_t maxlen, const char *subsys);44 45int filename__read_int(const char *filename, int *value);46int filename__read_ull(const char *filename, unsigned long long *value);47int filename__read_xll(const char *filename, unsigned long long *value);48int filename__read_str(const char *filename, char **buf, size_t *sizep);49 50int filename__write_int(const char *filename, int value);51 52int procfs__read_str(const char *entry, char **buf, size_t *sizep);53 54int sysctl__read_int(const char *sysctl, int *value);55int sysfs__read_int(const char *entry, int *value);56int sysfs__read_ull(const char *entry, unsigned long long *value);57int sysfs__read_xll(const char *entry, unsigned long long *value);58int sysfs__read_str(const char *entry, char **buf, size_t *sizep);59int sysfs__read_bool(const char *entry, bool *value);60 61int sysfs__write_int(const char *entry, int value);62#endif /* __API_FS__ */63