1 #ifndef _SYS_FILE_H 2 #define _SYS_FILE_H 3 #ifdef __cplusplus 4 extern "C" { 5 #endif 6 7 #define LOCK_SH 1 8 #define LOCK_EX 2 9 #define LOCK_NB 4 10 #define LOCK_UN 8 11 12 #define L_SET 0 13 #define L_INCR 1 14 #define L_XTND 2 15 16 int flock(int, int); 17 18 #ifdef __cplusplus 19 } 20 #endif 21 #endif 22