getresuid(2)                  System Calls Manual                 getresuid(2)

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)

Linux man-pages 6.7               2023-10-31                      getresuid(2)