proc_setegid     4912 process.c      	proc_setegid(obj, GIDT2NUM(gid));
proc_setegid     4920 process.c      	proc_setegid(obj, GIDT2NUM(SAVED_GROUP_ID));
proc_setegid     5158 process.c          rb_define_module_function(rb_mProcess, "egid=", proc_setegid, 1);