getuid(2) -- Linux man page

 

NAME

getuid, geteuid - get user identity  

SYNOPSIS

#include <unistd.h>
#include <sys/types.h>

uid_t getuid(void);
uid_t geteuid(void);  

DESCRIPTION

getuid returns the real user ID of the current process.

geteuid returns the effective user ID of the current process.

The real ID corresponds to the ID of the calling process. The effective ID corresponds to the set ID bit on the file being executed.  

ERRORS

These functions are always successful.  

CONFORMING TO

POSIX, BSD 4.3.  

SEE ALSO

setreuid(2), setuid(2)