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NAME

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

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 appropriately.

ERRORS

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

VERSIONS

       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.

CONFORMING TO

       These  calls are nonstandard; they also appear on HP-UX and some of the
       BSDs.

NOTES

       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)

COLOPHON

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