GETRESUID(2) Linux Programmer's Manual GETRESUID(2)
getresuid, getresgid - get real, effective and saved user/group IDs
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
process'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 non-standard; they also appear on HP-UX and some of the
getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7), fea-
This page is part of release 3.05 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2007-12-28 GETRESUID(2)