GETRESUID(2) Linux Programmer s Manual GETRESUID(2)
NAME getresuid, getresgid - get real, effective and saved user or group ID
SYNOPSIS #define _GNU_SOURCE #include <unistd.h>
int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid); int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
DESCRIPTION getresuid() and getresgid() (both introduced in Linux 2.1.44) get the real UID, effective UID, and saved set-user-ID (resp. group IDs) of the current process.
RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS EFAULT One of the arguments specified an address outside the calling programs address space.
CONFORMING TO These calls are non-standard; they also appear on HP-UX and some of the BSDs.
The prototype is given by glibc since version 2.3.2 provided _GNU_SOURCE is defined.
SEE ALSO getuid(2), setresuid(2), setreuid(2), setuid(2)
Linux 2.4 2003-05-26 GETRESUID(2)