NAME
getuid, geteuid - get user identity
SYNOPSIS
#include <unistd.h>
#include <sys/types.h>
uid_t getuid(void);
uid_t geteuid(void);
DESCRIPTION
R getuid ()
returns the real user ID of the current process.
R geteuid ()
returns the effective user ID of the current process.
When a normal program is executed, the effective and real user ID of
the process are set to the ID of the user executing the file.
When a set ID program is executed the real user ID is set to the
calling user and the effective user ID corresponds to the set ID bit
on the file being executed.
ERRORS
These functions are always successful.
CONFORMING TO
POSIX.1-2001, 4.3BSD.
NOTES
History
In Unix V6 the
R getuid ()
call returned (euid << 8) + uid.
Unix V7 introduced separate calls
R getuid ()
and
R geteuid ().
SEE ALSO
