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#ifndef _SYS_FILE_H
#define _SYS_FILE_H
#ifdef __cplusplus
extern "C" {
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define LOCK_SH 1
#define LOCK_EX 2
#define LOCK_NB 4
#define LOCK_UN 8
int flock(int, int);
#endif
#ifdef __cplusplus
}
#endif
#endif
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