geteuid man page


This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

geteuid — get the effective user ID


#include <unistd.h>

uid_t geteuid(void);


The geteuid() function shall return the effective user ID of the calling process.

Return Value

The geteuid() function shall always be successful and no return value is reserved to indicate an error.


No errors are defined.

The following sections are informative.

See Also

getegid(), getgid(), getuid(), setegid(), seteuid(), setgid(), setregid(), setreuid(), setuid()

The Base Definitions volume of POSIX.1‐2008, <sys_types.h>, <unistd.h>


2013 IEEE/The Open Group POSIX Programmer's Manual