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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
       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, Copyright (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.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                           GETUID(3P)