#include	"call.h"char	 escapec = '~';char	*src;char	*dst;static void	usage(char *);intmain(int argc, char *argv[]){	int			c, remfd, debug;	char		args[MAXLINE];	args[0] = 0;	/* build arg list for conn server here */	opterr = 0;		/* don't want getopt() writing to stderr */	while ((c = getopt(argc, argv, "des:o")) != EOF) {		switch (c) {		case 'd':		/* debug */			debug = 1;			strcat(args, "-d ");			break;		case 'e':		/* even parity */			strcat(args, "-e ");			break;		case 'o':		/* odd parity */			strcat(args, "-o ");			break;		case 's':		/* speed */			strcat(args, "-s ");			strcat(args, optarg);			strcat(args, " ");			break;		case '?':			usage("unrecognized option");		}	}	if (optind < argc)		strcat(args, argv[optind]);	/* name of host to call */	else		usage("missing <hostname> to call");	if ((remfd = call(args)) < 0)	/* place the call */		exit(1);	/* call() prints reason for failure */	printf("Connected\n");	if (tty_raw(STDIN_FILENO) < 0)	/* user's tty to raw mode */		err_sys("tty_raw error");	if (atexit(tty_atexit) < 0)		/* reset user's tty on exit */		err_sys("atexit error");	loop(remfd);					/* and do it */	printf("Disconnected\n\r");	exit(0);}static voidusage(char *msg){	err_quit("%s\nusage: call -d -e -o -s<speed> <hostname>", msg);}