/usr/include/diet/sys/fsuid.h is in dietlibc-dev 0.33~cvs20120325-6+deb8u1.
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 | #ifndef __FSUID_H
#define __FSUID_H 1
#include <sys/types.h>
__BEGIN_DECLS
/* Linux only: */
int setfsuid(uid_t uid);
int setfsgid(gid_t gid);
int setfsuid32(uid32_t fsuid) __THROW;
int setfsgid32(gid32_t fsgid) __THROW;
__END_DECLS
#endif
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