NetBSD/usr.bin/vi/interrupt.h

98 lines
3.7 KiB
C

/*-
* 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.
*
* from: @(#)interrupt.h 8.1 (Berkeley) 1/9/94
* $Id: interrupt.h,v 1.2 1994/01/24 06:38:54 cgd Exp $
*/
/*
* 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); \
} \
}