GETUID(2) | System Calls Manual | GETUID(2) |
getuid
, geteuid
— get user identification
#include
<unistd.h>
uid_t
getuid
(void);
uid_t
geteuid
(void);
The
getuid
()
function returns the real user ID of the calling process. The
geteuid
()
function returns the effective user ID of the calling process.
The real user ID is that of the user who has
invoked the program. As the effective user ID gives the process additional
permissions during execution of
“set-user-ID”
mode processes,
getuid
()
is used to determine the real user ID of the calling process.
The getuid
() and
geteuid
() functions are always successful, and no
return value is reserved to indicate an error.
The getuid
() and
geteuid
() functions conform to IEEE
Std 1003.1-2008 (“POSIX.1”).
The getuid
() system call first appeared in
Version 1 AT&T UNIX, and
geteuid
() in Version 7
AT&T UNIX.
September 10, 2015 | OpenBSD-6.5 |