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SETEGID(P)			    POSIX Programmer's Manual			       SETEGID(P)

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 implementa-
	      tion.

       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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       SETEGID(P)
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