|GETUID(2)||System Calls Manual||GETUID(2)|
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.
geteuid() functions are always successful, and no return value is reserved to indicate an error. getgid(2), getresuid(2), setreuid(2), setuid(2)
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 AT&T UNIX.
|September 10, 2015||OpenBSD-5.9|