/usr/include/x86_64-linux-musl/sys/fsuid.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 | #ifndef _SYS_FSUID_H
#define _SYS_FSUID_H
#ifdef __cplusplus
extern "C" {
#endif
#define __NEED_uid_t
#define __NEED_gid_t
#include <bits/alltypes.h>
int setfsuid(uid_t);
int setfsgid(gid_t);
#ifdef __cplusplus
}
#endif
#endif
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