diff options
Diffstat (limited to 'usr.bin/vi/interrupt.h')
| -rw-r--r-- | usr.bin/vi/interrupt.h | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/usr.bin/vi/interrupt.h b/usr.bin/vi/interrupt.h new file mode 100644 index 000000000000..baa75fef2ca9 --- /dev/null +++ b/usr.bin/vi/interrupt.h @@ -0,0 +1,96 @@ +/*- + * Copyright (c) 1994 + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + * + * @(#)interrupt.h 8.1 (Berkeley) 1/9/94 + */ + +/* + * Macros to declare the variables and then turn on and off interrupts. + */ +#define DECLARE_INTERRUPTS \ + struct sigaction __act, __oact; \ + struct termios __nterm, __term; \ + u_int __istate; \ + int __isig, __termreset + +/* + * Search, global, and substitute interruptions. + * + * ISIG turns on VINTR, VQUIT and VSUSP. We want VINTR to interrupt the + * search, so we install a handler. VQUIT is ignored by main() because + * nvi never wants to catch it. A handler for VSUSP should have been + * installed by the screen code. + */ +#define SET_UP_INTERRUPTS(handler) { \ + if (F_ISSET(sp->gp, G_ISFROMTTY)) { \ + __act.sa_handler = handler; \ + sigemptyset(&__act.sa_mask); \ + __act.sa_flags = 0; \ + if (__isig = !sigaction(SIGINT, &__act, &__oact)) { \ + __termreset = 0; \ + __istate = F_ISSET(sp, S_INTERRUPTIBLE); \ + F_CLR(sp, S_INTERRUPTED); \ + F_SET(sp, S_INTERRUPTIBLE); \ + if (tcgetattr(STDIN_FILENO, &__term)) { \ + rval = 1; \ + msgq(sp, M_SYSERR, "tcgetattr"); \ + goto interrupt_err; \ + } \ + __nterm = __term; \ + __nterm.c_lflag |= ISIG; \ + if (tcsetattr(STDIN_FILENO, \ + TCSANOW | TCSASOFT, &__nterm)) { \ + rval = 1; \ + msgq(sp, M_SYSERR, "tcsetattr"); \ + goto interrupt_err; \ + } \ + __termreset = 1; \ + } \ + } \ +} + +#define TEAR_DOWN_INTERRUPTS { \ + if (F_ISSET(sp->gp, G_ISFROMTTY) && __isig) { \ + if (sigaction(SIGINT, &__oact, NULL)) { \ + rval = 1; \ + msgq(sp, M_SYSERR, "signal"); \ + } \ + if (__termreset && tcsetattr(STDIN_FILENO, \ + TCSANOW | TCSASOFT, &__term)) { \ + rval = 1; \ + msgq(sp, M_SYSERR, "tcsetattr"); \ + } \ + F_CLR(sp, S_INTERRUPTED); \ + if (!__istate) \ + F_CLR(sp, S_INTERRUPTIBLE); \ + } \ +} |