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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 (consult 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 POSIX.1-2008, <sys_types.h>, <unistd.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                           GETUID(3P)