posix_setgid --
Set the GID of the current process
Description
bool posix_setgid ( int gid )
Set the real group ID of the current process. This is a
privileged function and you need appropriate privileges (usually
root) on your system to be able to perform this function. The
appropriate order of function calls is
posix_setgid() first,
posix_setuid() last.
Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.