#include <u.h>#include <libc.h> voidusage(void){	fprint(2, "usage: dial [-e] addr\n");	exits("usage");} voidkiller(void *x, char *msg){	USED(x);	if(strcmp(msg, "kill") == 0)		exits(0);	noted(NDFLT);} voidmain(int argc, char **argv){	int fd, pid;	char buf[8192];	int n, waitforeof; 	notify(killer);	waitforeof = 0;	ARGBEGIN{	case 'e':		waitforeof = 1;		break;	default:		usage();	}ARGEND 	if(argc != 1)		usage(); 	if((fd = dial(argv[0], nil, nil, nil)) < 0)		sysfatal("dial: %r"); 	switch(pid = fork()){	case -1:		sysfatal("fork: %r");	case 0:		while((n = read(0, buf, sizeof buf)) > 0)			if(write(fd, buf, n) < 0)				break;		if(!waitforeof)			postnote(PNPROC, getppid(), "kill");		exits(nil);	} 	while((n = read(fd, buf, sizeof buf)) > 0)		if(write(1, buf, n) < 0)			break; 	postnote(PNPROC, pid, "kill");	waitpid();	exits(0);}