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+.\" Hey Emacs! This file is -*- nroff -*- source.
+.\"
+.\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl)
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\"
+.\" Modified, 2003-05-26, Michael Kerrisk, <mtk16@ext,canterbury.ac.nz>
+.TH GETRESUID 2 2003-05-26 "Linux 2.4" "Linux Programmer's Manual"
+.SH NAME
+getresuid, getresgid \- get real, effective and saved user or group ID
+.SH SYNOPSIS
+.B #define _GNU_SOURCE
+.br
+.B #include <unistd.h>
+.sp
+.BI "int getresuid(uid_t *" ruid ", uid_t *" euid ", uid_t *" suid );
+.br
+.BI "int getresgid(gid_t *" rgid ", gid_t *" egid ", gid_t *" sgid ); 
+.SH DESCRIPTION
+.B getresuid
+and
+.B getresgid
+(both introduced in Linux 2.1.44)
+get the real, effective and saved user ID's (resp. group ID's)
+of the current process.
+
+.SH "RETURN VALUE"
+On success, zero is returned.  On error, \-1 is returned, and
+.I errno
+is set appropriately.
+.SH ERRORS
+.TP
+.B EFAULT
+One of the arguments specified an address outside the calling program's
+address space.
+.SH "CONFORMING TO"
+This call is Linux-specific.
+The prototype is given by glibc since version 2.3.2
+provided _GNU_SOURCE is defined.
+.SH "SEE ALSO"
+.BR getuid (2),
+.BR setresuid (2),
+.BR setreuid (2),
+.BR setuid (2)