mirror of https://github.com/mkerrisk/man-pages
92 lines
2.8 KiB
Groff
92 lines
2.8 KiB
Groff
.\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl)
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.\" and Copyright (c) 2007, Michael Kerrisk <mtk.manpages@gmail.com>
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" Modified, 2003-05-26, Michael Kerrisk, <mtk.manpages@gmail.com>
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.\"
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.TH GETRESUID 2 2010-11-22 "Linux" "Linux Programmer's Manual"
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.SH NAME
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getresuid, getresgid \- get real, effective and saved user/group IDs
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.SH SYNOPSIS
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.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
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.br
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.B #include <unistd.h>
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.PP
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.BI "int getresuid(uid_t *" ruid ", uid_t *" euid ", uid_t *" suid );
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.br
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.BI "int getresgid(gid_t *" rgid ", gid_t *" egid ", gid_t *" sgid );
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.SH DESCRIPTION
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.BR getresuid ()
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returns the real UID, the effective UID, and the saved set-user-ID
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of the calling process, in the arguments
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.IR ruid ,
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.IR euid ,
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and
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.IR suid ,
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respectively.
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.BR getresgid ()
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performs the analogous task for the process's group IDs.
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.SH RETURN VALUE
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On success, zero is returned.
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EFAULT
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One of the arguments specified an address outside the calling program's
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address space.
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.SH VERSIONS
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These system calls appeared on Linux starting with kernel 2.1.44.
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.PP
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The prototypes are given by glibc since version 2.3.2,
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provided
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.B _GNU_SOURCE
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is defined.
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.SH CONFORMING TO
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These calls are nonstandard;
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they also appear on HP-UX and some of the BSDs.
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.SH NOTES
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The original Linux
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.BR getresuid ()
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and
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.BR getresgid ()
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system calls supported only 16-bit user and group IDs.
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Subsequently, Linux 2.4 added
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.BR getresuid32 ()
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and
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.BR getresgid32 (),
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supporting 32-bit IDs.
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The glibc
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.BR getresuid ()
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and
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.BR getresgid ()
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wrapper functions transparently deal with the variations across kernel versions.
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.SH SEE ALSO
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.BR getuid (2),
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.BR setresuid (2),
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.BR setreuid (2),
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.BR setuid (2),
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.BR credentials (7)
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