NAME

       getresuid, getresgid - get real, effective, and saved user/group IDs

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #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() 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.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set to indicate the error.

ERRORS

       EFAULT One of the arguments specified an address outside the calling program's address space.

STANDARDS

       None.  These calls also appear on HP-UX and some of the BSDs.

HISTORY

       Linux 2.1.44, glibc 2.3.2.

       The  original  Linux  getresuid()  and getresgid() system calls supported only 16-bit user and group IDs.
       Subsequently, Linux 2.4  added  getresuid32()  and  getresgid32(),  supporting  32-bit  IDs.   The  glibc
       getresuid()  and  getresgid()  wrapper  functions  transparently  deal  with the variations across kernel
       versions.

SEE ALSO

       getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7)