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 execution 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
STANDARDS
geteuid() and
getuid() functions conform to IEEE
Std 1003.1-1988 (“POSIX.1”).