GETUID
Section: Linux Programmer's Manual (2)
Updated: 2010-11-22
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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.
CONFORMING TO
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)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- History
-
- SEE ALSO
-
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