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kernel add
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#ifndef __API_FS__
#define __API_FS__
#include <stdbool.h>
/*
* On most systems <limits.h> would have given us this, but not on some systems
* (e.g. GNU/Hurd).
*/
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
#define FS(name) \
const char *name##__mountpoint(void); \
const char *name##__mount(void); \
bool name##__configured(void); \
FS(sysfs)
FS(procfs)
FS(debugfs)
FS(tracefs)
#undef FS
int filename__read_int(const char *filename, int *value);
int filename__read_ull(const char *filename, unsigned long long *value);
int sysctl__read_int(const char *sysctl, int *value);
int sysfs__read_int(const char *entry, int *value);
int sysfs__read_ull(const char *entry, unsigned long long *value);
#endif /* __API_FS__ */
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