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getresuid, getresgid — get real, effective and saved user/group IDs
#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); |
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.
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
One of the arguments specified an address outside the calling program's address space.
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.
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.
This page is part of release 3.52 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/.
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Copyright (C) 1997 Andries Brouwer (aebcwi.nl) and Copyright (c) 2007, Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) 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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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. %%%LICENSE_END Modified, 2003-05-26, Michael Kerrisk, <mtk.manpagesgmail.com> |