getuid(2) BSD System Calls Manual getuid(2)
NAME
geteuid, getuid -- get user identification
SYNOPSIS
#include <unistd.h>
uid_t
geteuid(void);
uid_t
getuid(void);
DESCRIPTION
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 execu-
tion of ``set-user-ID'' mode processes, getuid() is used to determine the
real-user-id of the calling process.
ERRORS
The getuid() and geteuid() functions are always successful, and no return
value is reserved to indicate an error.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
The include file <sys/types.h> is necessary for both functions.
SEE ALSO
getgid(2), setreuid(2), compat(5)
STANDARDS
Geteuid() and getuid() functions conform to IEEE Std 1003.1-1988
(``POSIX.1'').
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
Mac OS X 10.9.1 - Generated Mon Jan 6 07:34:11 CST 2014