/* * Sample client. */#include <u.h>#include <libc.h> voidxfer(int from, int to){	char buf[12*1024];	int n; 	while((n = read(from, buf, sizeof buf)) > 0)		if(write(to, buf, n) < 0)			sysfatal("write failed: %r");	if(n < 0)		sysfatal("read failed: %r");} voidusage(void){	fprint(2, "usage: webget [-b baseurl] [-m mtpt] [-p postbody] url\n");	exits("usage");} voidmain(int argc, char **argv){	int conn, ctlfd, fd, i, n;	char buf[128], *base, *mtpt, *post, *url; 	mtpt = "/mnt/web";	post = nil;	base = nil;	ARGBEGIN{	default:		usage();	case 'b':		base = EARGF(usage());		break;	case 'm':		mtpt = EARGF(usage());		break;	case 'p':		post = EARGF(usage());		break;	}ARGEND; 	if (argc != 1) 		usage(); 	url = argv[0]; 	snprint(buf, sizeof buf, "%s/clone", mtpt);	if((ctlfd = open(buf, ORDWR)) < 0)		sysfatal("couldn't open %s: %r", buf);	if((n = read(ctlfd, buf, sizeof buf-1)) < 0)		sysfatal("reading clone: %r");	if(n == 0)		sysfatal("short read on clone");	buf[n] = '\0';	conn = atoi(buf); 	if(base)		if(fprint(ctlfd, "baseurl %s", base) < 0)			sysfatal("baseurl ctl write: %r"); 	if(fprint(ctlfd, "url %s", url) <= 0)		sysfatal("get ctl write: %r"); 	if(post){		snprint(buf, sizeof buf, "%s/%d/postbody", mtpt, conn);		if((fd = open(buf, OWRITE)) < 0)			sysfatal("open %s: %r", buf);		if(write(fd, post, strlen(post)) < 0)			sysfatal("post write failed: %r");		close(fd);	} 	snprint(buf, sizeof buf, "%s/%d/body", mtpt, conn);	if((fd = open(buf, OREAD)) < 0)		sysfatal("open %s: %r", buf); 	xfer(fd, 1);	exits(nil);}