1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 06/06/93"; 10 #endif /* not lint */ 11 12 /* 13 * This file contains the I/O handling and the exchange of 14 * edit characters. This connection itself is established in 15 * ctl.c 16 */ 17 18 #include <sys/ioctl.h> 19 #include <sys/time.h> 20 #include <stdio.h> 21 #include <errno.h> 22 #include <string.h> 23 #include "talk.h" 24 25 #define A_LONG_TIME 10000000 26 #define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard 27 input */ 28 29 /* 30 * The routine to do the actual talking 31 */ 32 talk() 33 { 34 register int read_template, sockt_mask; 35 int read_set, nb; 36 char buf[BUFSIZ]; 37 struct timeval wait; 38 39 message("Connection established\007\007\007"); 40 current_line = 0; 41 sockt_mask = (1<<sockt); 42 43 /* 44 * Wait on both the other process (sockt_mask) and 45 * standard input ( STDIN_MASK ) 46 */ 47 read_template = sockt_mask | STDIN_MASK; 48 for (;;) { 49 read_set = read_template; 50 wait.tv_sec = A_LONG_TIME; 51 wait.tv_usec = 0; 52 nb = select(32, &read_set, 0, 0, &wait); 53 if (nb <= 0) { 54 if (errno == EINTR) { 55 read_set = read_template; 56 continue; 57 } 58 /* panic, we don't know what happened */ 59 p_error("Unexpected error from select"); 60 quit(); 61 } 62 if (read_set & sockt_mask) { 63 /* There is data on sockt */ 64 nb = read(sockt, buf, sizeof buf); 65 if (nb <= 0) { 66 message("Connection closed. Exiting"); 67 quit(); 68 } 69 display(&his_win, buf, nb); 70 } 71 if (read_set & STDIN_MASK) { 72 /* 73 * We can't make the tty non_blocking, because 74 * curses's output routines would screw up 75 */ 76 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 77 nb = read(0, buf, nb); 78 display(&my_win, buf, nb); 79 /* might lose data here because sockt is non-blocking */ 80 write(sockt, buf, nb); 81 } 82 } 83 } 84 85 extern int errno; 86 extern int sys_nerr; 87 88 /* 89 * p_error prints the system error message on the standard location 90 * on the screen and then exits. (i.e. a curses version of perror) 91 */ 92 p_error(string) 93 char *string; 94 { 95 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 96 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 97 string, strerror(errno), errno); 98 wrefresh(my_win.x_win); 99 move(LINES-1, 0); 100 refresh(); 101 quit(); 102 } 103 104 /* 105 * Display string in the standard location 106 */ 107 message(string) 108 char *string; 109 { 110 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 111 wprintw(my_win.x_win, "[%s]", string); 112 wclrtoeol(my_win.x_win); 113 current_line++; 114 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 115 wrefresh(my_win.x_win); 116 } 117