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 .