setgid

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



IEEE/The Open Group                  2003                            SETGID(P)