seteuid

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() , set-
       gid()  , setregid() , setreuid() , setuid() , the Base Definitions vol-
       ume 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