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

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the	 corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

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 effec‐
       tive 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() , 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
       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			    SETEGID(P)

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