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#define _GNU_SOURCE /* See feature_test_macros(7) */
int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
getresuid() returns the real UID, the effective UID, and the saved set-
user-ID of the calling process, in the arguments ruid, euid, and suid,
respectively. getresgid() performs the analogous task for the pro-
cess's group IDs.
On success, zero is returned. On error, -1 is returned, and errno is
EFAULT One of the arguments specified an address outside the calling
program's address space.
These system calls appeared on Linux starting with kernel 2.1.44.
The prototypes are given by glibc since version 2.3.2, provided
_GNU_SOURCE is defined.
These calls are nonstandard; they also appear on HP-UX and some of the
The original Linux getresuid() and getresgid() system calls supported
only 16-bit user and group IDs. Subsequently, Linux 2.4 added getre-
suid32() and getresgid32(), supporting 32-bit IDs. The glibc getre-
suid() and getresgid() wrapper functions transparently deal with the
variations across kernel versions.
getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7)
Linux 2010-11-22 GETRESUID(2)