tstp.c revision 1.11 1 1.11 phil /* $NetBSD: tstp.c,v 1.11 1997/11/13 00:40:27 phil Exp $ */
2 1.9 mikel
3 1.1 cgd /*
4 1.8 cgd * Copyright (c) 1981, 1993, 1994
5 1.5 cgd * The Regents of the University of California. All rights reserved.
6 1.1 cgd *
7 1.1 cgd * Redistribution and use in source and binary forms, with or without
8 1.1 cgd * modification, are permitted provided that the following conditions
9 1.1 cgd * are met:
10 1.1 cgd * 1. Redistributions of source code must retain the above copyright
11 1.1 cgd * notice, this list of conditions and the following disclaimer.
12 1.1 cgd * 2. Redistributions in binary form must reproduce the above copyright
13 1.1 cgd * notice, this list of conditions and the following disclaimer in the
14 1.1 cgd * documentation and/or other materials provided with the distribution.
15 1.1 cgd * 3. All advertising materials mentioning features or use of this software
16 1.1 cgd * must display the following acknowledgement:
17 1.1 cgd * This product includes software developed by the University of
18 1.1 cgd * California, Berkeley and its contributors.
19 1.1 cgd * 4. Neither the name of the University nor the names of its contributors
20 1.1 cgd * may be used to endorse or promote products derived from this software
21 1.1 cgd * without specific prior written permission.
22 1.1 cgd *
23 1.1 cgd * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 1.1 cgd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 1.1 cgd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 1.1 cgd * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 1.1 cgd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 1.1 cgd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 1.1 cgd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 1.1 cgd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 1.1 cgd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 1.1 cgd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 1.1 cgd * SUCH DAMAGE.
34 1.1 cgd */
35 1.1 cgd
36 1.9 mikel #include <sys/cdefs.h>
37 1.1 cgd #ifndef lint
38 1.9 mikel #if 0
39 1.8 cgd static char sccsid[] = "@(#)tstp.c 8.3 (Berkeley) 5/4/94";
40 1.9 mikel #else
41 1.11 phil __RCSID("$NetBSD: tstp.c,v 1.11 1997/11/13 00:40:27 phil Exp $");
42 1.9 mikel #endif
43 1.1 cgd #endif /* not lint */
44 1.1 cgd
45 1.3 mycroft #include <errno.h>
46 1.3 mycroft #include <signal.h>
47 1.3 mycroft #include <termios.h>
48 1.3 mycroft #include <unistd.h>
49 1.1 cgd
50 1.8 cgd #include "curses.h"
51 1.5 cgd
52 1.1 cgd /*
53 1.5 cgd * stop_signal_handler --
54 1.5 cgd * Handle stop signals.
55 1.1 cgd */
56 1.1 cgd void
57 1.5 cgd __stop_signal_handler(signo)
58 1.3 mycroft int signo;
59 1.3 mycroft {
60 1.5 cgd sigset_t oset, set;
61 1.1 cgd
62 1.5 cgd /*
63 1.5 cgd * Block window change and timer signals. The latter is because
64 1.5 cgd * applications use timers to decide when to repaint the screen.
65 1.5 cgd */
66 1.5 cgd (void)sigemptyset(&set);
67 1.5 cgd (void)sigaddset(&set, SIGALRM);
68 1.5 cgd (void)sigaddset(&set, SIGWINCH);
69 1.5 cgd (void)sigprocmask(SIG_BLOCK, &set, &oset);
70 1.5 cgd
71 1.5 cgd /*
72 1.5 cgd * End the window, which also resets the terminal state to the
73 1.5 cgd * original modes.
74 1.5 cgd */
75 1.10 phil __stopwin();
76 1.3 mycroft
77 1.5 cgd /* Unblock SIGTSTP. */
78 1.3 mycroft (void)sigemptyset(&set);
79 1.5 cgd (void)sigaddset(&set, SIGTSTP);
80 1.3 mycroft (void)sigprocmask(SIG_UNBLOCK, &set, NULL);
81 1.5 cgd
82 1.5 cgd /* Stop ourselves. */
83 1.5 cgd (void)kill(0, SIGTSTP);
84 1.3 mycroft
85 1.3 mycroft /* Time passes ... */
86 1.3 mycroft
87 1.10 phil /* restart things */
88 1.10 phil __restartwin();
89 1.5 cgd
90 1.5 cgd /* Reset the signals. */
91 1.5 cgd (void)sigprocmask(SIG_SETMASK, &oset, NULL);
92 1.5 cgd }
93 1.5 cgd
94 1.9 mikel static void (*otstpfn) __P((int)) = SIG_DFL;
95 1.5 cgd
96 1.5 cgd /*
97 1.5 cgd * Set the TSTP handler.
98 1.5 cgd */
99 1.5 cgd void
100 1.5 cgd __set_stophandler()
101 1.5 cgd {
102 1.5 cgd otstpfn = signal(SIGTSTP, __stop_signal_handler);
103 1.5 cgd }
104 1.5 cgd
105 1.5 cgd /*
106 1.5 cgd * Restore the TSTP handler.
107 1.5 cgd */
108 1.5 cgd void
109 1.5 cgd __restore_stophandler()
110 1.5 cgd {
111 1.5 cgd (void)signal(SIGTSTP, otstpfn);
112 1.10 phil }
113 1.10 phil
114 1.10 phil
115 1.10 phil /* To allow both SIGTSTP and endwin() to come back nicely, we provide
116 1.10 phil the following routines. */
117 1.10 phil
118 1.11 phil static struct termios save_termios;
119 1.10 phil
120 1.10 phil int
121 1.10 phil __stopwin()
122 1.10 phil {
123 1.10 phil /* Get the current terminal state (which the user may have changed). */
124 1.11 phil (void)tcgetattr(STDIN_FILENO, &save_termios);
125 1.10 phil
126 1.10 phil __restore_stophandler();
127 1.10 phil
128 1.10 phil if (curscr != NULL) {
129 1.10 phil if (curscr->flags & __WSTANDOUT) {
130 1.10 phil tputs(SE, 0, __cputchar);
131 1.10 phil curscr->flags &= ~__WSTANDOUT;
132 1.10 phil }
133 1.10 phil __mvcur(curscr->cury, curscr->cury, curscr->maxy - 1, 0, 0);
134 1.10 phil }
135 1.10 phil
136 1.10 phil (void)tputs(VE, 0, __cputchar);
137 1.10 phil (void)tputs(TE, 0, __cputchar);
138 1.10 phil (void)fflush(stdout);
139 1.10 phil (void)setvbuf(stdout, NULL, _IOLBF, 0);
140 1.10 phil
141 1.10 phil return (tcsetattr(STDIN_FILENO, __tcaction ?
142 1.10 phil TCSASOFT | TCSADRAIN : TCSADRAIN, &__orig_termios) ? ERR : OK);
143 1.10 phil }
144 1.10 phil
145 1.10 phil
146 1.10 phil void
147 1.10 phil __restartwin()
148 1.10 phil {
149 1.10 phil /* Reset the curses SIGTSTP signal handler. */
150 1.10 phil __set_stophandler();
151 1.10 phil
152 1.10 phil /* save the new "default" terminal state */
153 1.10 phil (void)tcgetattr(STDIN_FILENO, &__orig_termios);
154 1.10 phil
155 1.10 phil /* Reset the terminal state to the mode just before we stopped. */
156 1.10 phil (void)tcsetattr(STDIN_FILENO, __tcaction ?
157 1.11 phil TCSASOFT | TCSADRAIN : TCSADRAIN, &save_termios);
158 1.10 phil
159 1.10 phil /* Restart the screen. */
160 1.10 phil __startwin();
161 1.11 phil
162 1.11 phil /* Repaint the screen. */
163 1.11 phil wrefresh(curscr);
164 1.1 cgd }
165