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NAME
       seteuid - set effective user ID


SYNOPSIS
       #include <unistd.h>

       int seteuid(uid_t uid);


DESCRIPTION
       If  uid  is  equal  to  the  real  user  ID  or  the saved set-user-ID, or if the process has appropriate
       privileges, seteuid() shall set the effective user ID of the calling process to uid; the real user ID and
       saved set-user-ID shall remain unchanged.

       The seteuid() function shall not affect the supplementary group list in any way.


RETURN VALUE
       Upon successful completion, 0 shall be returned; otherwise,  -1  shall  be  returned  and  errno  set  to
       indicate the error.


ERRORS
       The seteuid() function shall fail if:

       EINVAL The value of the uid argument is invalid and is not supported by the implementation.

       EPERM  The  process  does not have appropriate privileges and uid does not match the real group ID or the
              saved set-group-ID.

       The following sections are informative.


EXAMPLES
       None.


APPLICATION USAGE
       None.


RATIONALE
       Refer to the RATIONALE section in setuid() .


FUTURE DIRECTIONS
       None.


SEE ALSO
       exec() , getegid() , geteuid() , getgid() , getuid() , setegid() , 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                                            SETEUID(P)