[unix-history] / usr.bin / vi / interrupt.h

/*-
 * 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);			\
	}								\
}
Commit	Line	Data
1e64b3ba JH	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	}