diff options
Diffstat (limited to 'usr.bin/talk/io.c')
| -rw-r--r-- | usr.bin/talk/io.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/usr.bin/talk/io.c b/usr.bin/talk/io.c new file mode 100644 index 0000000..f789f57 --- /dev/null +++ b/usr.bin/talk/io.c @@ -0,0 +1,139 @@ +/* $NetBSD: io.c,v 1.14 2011/09/06 18:32:03 joerg Exp $ */ + +/* + * Copyright (c) 1983, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#ifndef lint +#if 0 +static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; +#endif +__RCSID("$NetBSD: io.c,v 1.14 2011/09/06 18:32:03 joerg Exp $"); +#endif /* not lint */ + +/* + * This file contains the I/O handling and the exchange of + * edit characters. This connection itself is established in + * ctl.c + */ + +#include "talk.h" +#include <sys/ioctl.h> +#include <sys/time.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <unistd.h> +#include <poll.h> + +#define A_LONG_TIME 1000000 + +/* + * The routine to do the actual talking + */ +void +talk(void) +{ + struct pollfd set[2]; + int nb; + char buf[BUFSIZ]; + + message("Connection established\007\007\007"); + current_line = 0; + + /* + * Wait on both the other process (sockt_mask) and + * standard input ( STDIN_MASK ) + */ + set[0].fd = sockt; + set[0].events = POLLIN; + set[1].fd = fileno(stdin); + set[1].events = POLLIN; + for (;;) { + nb = poll(set, 2, A_LONG_TIME * 1000); + if (nb <= 0) { + if (errno == EINTR) + continue; + /* panic, we don't know what happened */ + p_error("Unexpected error from poll"); + quit(); + } + if (set[0].revents & POLLIN) { + /* There is data on sockt */ + nb = read(sockt, buf, sizeof buf); + if (nb <= 0) { + message("Connection closed. Exiting"); + quit(); + } + display(&his_win, buf, nb); + } + if (set[1].revents & POLLIN) { + /* + * We can't make the tty non_blocking, because + * curses's output routines would screw up + */ + ioctl(0, FIONREAD, (void *) &nb); + nb = read(0, buf, nb); + display(&my_win, buf, nb); + /* might lose data here because sockt is non-blocking */ + if (nb > 0) + write(sockt, buf, nb); + } + } +} + +/* + * p_error prints the system error message on the standard location + * on the screen and then exits. (i.e. a curses version of perror) + */ +void +p_error(const char *string) +{ + wmove(my_win.x_win, current_line%my_win.x_nlines, 0); + wprintw(my_win.x_win, "[%s : %s (%d)]\n", + string, strerror(errno), errno); + wrefresh(my_win.x_win); + move(LINES-1, 0); + refresh(); + quit(); +} + +/* + * Display string in the standard location + */ +void +message(const char *string) +{ + wmove(my_win.x_win, current_line % my_win.x_nlines, 0); + wprintw(my_win.x_win, "[%s]", string); + wclrtoeol(my_win.x_win); + current_line++; + wmove(my_win.x_win, current_line % my_win.x_nlines, 0); + wrefresh(my_win.x_win); +} |