getresuid, getresgid - get real, effective and saved user or group ID
#include <unistd.h>
int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid__);
getresuid(2) (both introduced in Linux 2.1.44) get the RealID, EffectiveID and SavedID?'s (resp. group ID's) of the current process.
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
This call is Linux-specific.
getuid(2), setuid(2), getreuid(2)?, setreuid(2), setresuid(2)
3 pages link to getresuid(2):