|GETUID(2)||System Calls Manual||GETUID(2)|
— get user identification
getuid() function returns the real
user ID of the calling process. The
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.
geteuid() functions are always successful, and no
return value is reserved to indicate an error.
geteuid() functions conform to IEEE
Std 1003.1-2008 (“POSIX.1”).
getuid() system call first appeared in
Version 1 AT&T UNIX, and
geteuid() in Version 7
|September 10, 2015||OpenBSD-current|