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SETGID(3P)                 POSIX Programmer's Manual                SETGID(3P)

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
       setgid - set-group-ID
SYNOPSIS
       #include <unistd.h>
       int setgid(gid_t gid);

DESCRIPTION
       If the process has appropriate privileges, setgid() shall set the  real
       group ID, effective group ID, and the saved set-group-ID of the calling
       process to gid.
       If the process does not have appropriate privileges, but gid  is  equal
       to  the real group ID or the saved set-group-ID, setgid() shall set the
       effective group ID to gid; the real group  ID  and  saved  set-group-ID
       shall remain unchanged.
       The  setgid() function shall not affect the supplementary group list in
       any way.
       Any supplementary  group  IDs  of  the  calling  process  shall  remain
       unchanged.
RETURN VALUE
       Upon  successful  completion,  0  is  returned.  Otherwise, -1 shall be
       returned and errno set to indicate the error.
ERRORS
       The setgid() 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(), setegid(), seteuid(),
       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 .

IEEE/The Open Group                  2003                           SETGID(3P)