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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 extern int flock(int, int); #endif #ifdef __cplusplus } #endif #endif