getuid, geteuid — get user identity
#include <unistd.h>
uid_t
getuid( |
void); |
uid_t
geteuid( |
void); |
getuid() returns the real
user ID of the calling process.
geteuid() returns the
effective user ID of the calling process.
In UNIX V6 the getuid()
call returned (euid << 8)
+ uid. UNIX V7 introduced separate calls
getuid() and geteuid().
The original Linux getuid() and geteuid() system calls supported only
16-bit user IDs. Subsequently, Linux 2.4 added getuid32() and geteuid32(), supporting 32-bit IDs. The
glibc getuid() and
geteuid() wrapper functions
transparently deal with the variations across kernel
versions.
On Alpha, instead of a pair of getuid() and geteuid() system calls, a single
getxuid() system call is
provided, which returns a pair of real and effective UIDs.
The glibc getuid() and
geteuid() wrapper functions
transparently deal with this. See syscall(2) for details
regarding register mapping.
This page is part of release 5.11 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright 1993 Rickard E. Faith (faithcs.unc.edu) %%%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 Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date.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 Historical remark, aeb, 2004-06-05 |