| 1 | /*- |
| 2 | * Copyright (c) 1994 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * @(#)interrupt.h 8.1 (Berkeley) 1/9/94 |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * Macros to declare the variables and then turn on and off interrupts. |
| 38 | */ |
| 39 | #define DECLARE_INTERRUPTS \ |
| 40 | struct sigaction __act, __oact; \ |
| 41 | struct termios __nterm, __term; \ |
| 42 | u_int __istate; \ |
| 43 | int __isig, __termreset |
| 44 | |
| 45 | /* |
| 46 | * Search, global, and substitute interruptions. |
| 47 | * |
| 48 | * ISIG turns on VINTR, VQUIT and VSUSP. We want VINTR to interrupt the |
| 49 | * search, so we install a handler. VQUIT is ignored by main() because |
| 50 | * nvi never wants to catch it. A handler for VSUSP should have been |
| 51 | * installed by the screen code. |
| 52 | */ |
| 53 | #define SET_UP_INTERRUPTS(handler) { \ |
| 54 | if (F_ISSET(sp->gp, G_ISFROMTTY)) { \ |
| 55 | __act.sa_handler = handler; \ |
| 56 | sigemptyset(&__act.sa_mask); \ |
| 57 | __act.sa_flags = 0; \ |
| 58 | if (__isig = !sigaction(SIGINT, &__act, &__oact)) { \ |
| 59 | __termreset = 0; \ |
| 60 | __istate = F_ISSET(sp, S_INTERRUPTIBLE); \ |
| 61 | F_CLR(sp, S_INTERRUPTED); \ |
| 62 | F_SET(sp, S_INTERRUPTIBLE); \ |
| 63 | if (tcgetattr(STDIN_FILENO, &__term)) { \ |
| 64 | rval = 1; \ |
| 65 | msgq(sp, M_SYSERR, "tcgetattr"); \ |
| 66 | goto interrupt_err; \ |
| 67 | } \ |
| 68 | __nterm = __term; \ |
| 69 | __nterm.c_lflag |= ISIG; \ |
| 70 | if (tcsetattr(STDIN_FILENO, \ |
| 71 | TCSANOW | TCSASOFT, &__nterm)) { \ |
| 72 | rval = 1; \ |
| 73 | msgq(sp, M_SYSERR, "tcsetattr"); \ |
| 74 | goto interrupt_err; \ |
| 75 | } \ |
| 76 | __termreset = 1; \ |
| 77 | } \ |
| 78 | } \ |
| 79 | } |
| 80 | |
| 81 | #define TEAR_DOWN_INTERRUPTS { \ |
| 82 | if (F_ISSET(sp->gp, G_ISFROMTTY) && __isig) { \ |
| 83 | if (sigaction(SIGINT, &__oact, NULL)) { \ |
| 84 | rval = 1; \ |
| 85 | msgq(sp, M_SYSERR, "signal"); \ |
| 86 | } \ |
| 87 | if (__termreset && tcsetattr(STDIN_FILENO, \ |
| 88 | TCSANOW | TCSASOFT, &__term)) { \ |
| 89 | rval = 1; \ |
| 90 | msgq(sp, M_SYSERR, "tcsetattr"); \ |
| 91 | } \ |
| 92 | F_CLR(sp, S_INTERRUPTED); \ |
| 93 | if (!__istate) \ |
| 94 | F_CLR(sp, S_INTERRUPTIBLE); \ |
| 95 | } \ |
| 96 | } |