NAME

       setegid - set the effective group ID

SYNOPSIS

       #include <unistd.h>

       int setegid(gid_t gid);

DESCRIPTION

       If  gid  is  equal  to  the real group ID or the saved set-group-ID, or if the process has
       appropriate privileges, setegid() shall set the effective group ID of the calling  process
       to  gid;  the  real  group  ID,  saved set-group-ID, and any supplementary group IDs shall
       remain unchanged.

       The setegid() 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 setegid() function shall fail if:

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

       EPERM  The process does not have appropriate privileges and gid 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() , 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 .