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NAME

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

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() 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 non-standard; they also appear on HP-UX and some of the
       BSDs.

SEE ALSO

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

COLOPHON

       This  page  is  part of release 2.77 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/.