#include <u.h>#include <libc.h> extern void game(int); static voidusage(void){	fprint(2, "Internet Go Client\n");	fprint(2, "usage: %s [-s gobansize]\n", argv0);	exits("usage");} voidmain(int argc, char *argv[]){	int sg; 	sg = 0;	ARGBEGIN {	case 's':		sg = atoi(EARGF(usage()));		break;	case 'h':		usage();	} ARGEND	if(argc != 0)		usage(); 	switch(rfork(RFPROC)){	case 0:		game(sg);		break;	default:		wait();	}	exits(0);}