NAME¶
getuid, geteuid - get user identity
SYNOPSIS¶
#include <unistd.h>
#include <sys/types.h>
uid_t getuid(void);
uid_t geteuid(void);
DESCRIPTION¶
getuid() returns the real user ID of the calling process.
geteuid() returns the effective user ID of the calling process.
ERRORS¶
These functions are always successful.
POSIX.1-2001, 4.3BSD.
NOTES¶
History¶
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.
SEE ALSO¶
getresuid(2),
setreuid(2),
setuid(2),
credentials(7)
COLOPHON¶
This page is part of release 3.74 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
http://www.kernel.org/doc/man-pages/.
