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GETRESUID(2)                  Linux Programmer's Manual                  GETRESUID(2)

NAME         top

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

SYNOPSIS         top

       #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         top

       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         top

       On success, zero is returned.  On error, -1 is returned, and errno is set
       appropriately.

ERRORS         top

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

VERSIONS         top

       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         top

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

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 3.32 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/.

Linux                                 2010-11-22                         GETRESUID(2)

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