/********************************************************************** * Copyright (c) Digital Equipment Corporation 1984, 1985, 1986. * * All Rights Reserved. * * Reference "/usr/src/COPYRIGHT" for applicable restrictions. * **********************************************************************/ static char *Sccsid = "@(#)io.c 3.0 (ULTRIX-11) 4/22/86"; /* 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 <stdio.h> #include <errno.h> #ifdef vax #include <sys/time.h> #endif vax #define A_LONG_TIME 10000000 #define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard input */ extern int errno; /* * The routine to do the actual talking */ talk() { #ifdef vax register int read_template, sockt_mask; int read_set, nb; #else pdp11 long read_template, sockt_mask; long read_set; register int nb; #endif char buf[BUFSIZ]; #ifdef vax struct timeval wait; #endif vax message("Connection established\007\007\007"); current_line = 0; sockt_mask = (1L<<sockt); /* * wait on both the other process (sockt_mask) and * standard input ( STDIN_MASK ) */ read_template = sockt_mask | STDIN_MASK; forever { read_set = read_template; #ifdef vax wait.tv_sec = A_LONG_TIME; wait.tv_usec = 0; nb = select(32, &read_set, 0, 0, &wait); #else pdp11 nb = select(32, &read_set, 0, 0, 0); #endif if (nb <= 0) { /* We may be returning from an interupt handler */ if (errno == EINTR) { read_set = read_template; continue; } else { /* panic, we don't know what happened */ p_error("Unexpected error from select"); quit(); } } if ( read_set & sockt_mask ) { /* There is data on sockt */ nb = read(sockt, buf, sizeof buf); if (nb <= 0) { message("Connection closed. Exiting"); quit(); } else { display(&his_win, buf, nb); } } if ( read_set & STDIN_MASK ) { /* we can't make the tty non_blocking, because curses's output routines would screw up */ #ifdef pdp11 long foo; ioctl(0, FIONREAD, (struct sgttyb *) &foo); nb = read(0, buf, (int)foo); #else vax ioctl(0, FIONREAD, (struct sgttyb *) &nb); nb = read(0, buf, nb); #endif display(&my_win, buf, nb); write(sockt, buf, nb); /* We might lose data here because sockt is non-blocking */ } } } extern int errno; extern int sys_nerr; extern char *sys_errlist[]; /* p_error prints the system error message on the standard location on the screen and then exits. (i.e. a curses version of perror) */ p_error(string) char *string; { char *sys; sys = "Unknown error"; if(errno < sys_nerr) { sys = sys_errlist[errno]; } wmove(my_win.x_win, current_line%my_win.x_nlines, 0); wprintw(my_win.x_win, "[%s : %s (%d)]\n", string, sys, errno); wrefresh(my_win.x_win); move(LINES-1, 0); refresh(); quit(); } /* display string in the standard location */ message(string) char *string; { wmove(my_win.x_win, current_line%my_win.x_nlines, 0); wprintw(my_win.x_win, "[%s]\n", string); wrefresh(my_win.x_win); }