/usr/include/x86_64-linux-musl/sys/file.h is in musl-dev 0.9.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | #ifndef _SYS_FILE_H
#define _SYS_FILE_H
#ifdef __cplusplus
extern "C" {
#endif
#define LOCK_SH 1
#define LOCK_EX 2
#define LOCK_NB 4
#define LOCK_UN 8
#define L_SET 0
#define L_INCR 1
#define L_XTND 2
int flock(int, int);
#ifdef __cplusplus
}
#endif
#endif
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