GETUID(3P)                                          POSIX Programmer's Manual                                         GETUID(3P)



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

NAME
       getuid - get a real user ID

SYNOPSIS
       #include <unistd.h>

       uid_t getuid(void);


DESCRIPTION
       The getuid() function shall return the real user ID of the calling process.

RETURN VALUE
       The getuid() function shall always be successful and no return value is reserved to indicate the error.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
   Setting the Effective User ID to the Real User ID
       The  following  example sets the effective user ID and the real user ID of the current process to the real user ID of the
       caller.


              #include <unistd.h>
              #include <sys/types.h>
              ...
              setreuid(getuid(), getuid());
              ...

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       getegid(), geteuid(), getgid(), setegid(), seteuid(), setgid(), setregid(), setreuid(), setuid(),  the  Base  Definitions
       volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
       Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6,  Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open  Group
       Standard   is   the   referee   document.   The   original   Standard   can   be   obtained  online  at  http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                    GETUID(3P)