1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1988 AT&T	*/
28 /*	  All Rights Reserved	*/
29 
30 /*
31  * University Copyright- Copyright (c) 1982, 1986, 1988
32  * The Regents of the University of California
33  * All Rights Reserved
34  *
35  * University Acknowledgment- Portions of this document are derived from
36  * software developed by the University of California, Berkeley, and its
37  * contributors.
38  */
39 
40 #pragma ident	"%Z%%M%	%I%	%E% SMI"
41 
42 /*LINTLIBRARY*/
43 
44 #include	<stdlib.h>
45 #include	<signal.h>
46 #include	<sys/types.h>
47 #include	"curses_inc.h"
48 
49 /*
50  * This routine initializes the current and standard screen,
51  * and sets up the terminal.  In case of error, initscr aborts.
52  * If you want an error status returned, call
53  *	scp = newscreen(getenv("TERM"), 0, 0, 0, stdout, stdin);
54  */
55 
56 WINDOW	*
initscr(void)57 initscr(void)
58 {
59 #ifdef	SIGPOLL
60 	void	(*savsignal)(int);
61 	extern	void	_ccleanup(int);
62 #else	/* SIGPOLL */
63 	int		(*savsignal)();
64 	extern	int	_ccleanup(int);
65 #endif	/* SIGPOLL */
66 
67 #ifdef	SIGTSTP
68 	extern	void	_tstp(int);
69 #endif	/* SIGTSTP */
70 
71 	static	char	i_called_before = FALSE;
72 
73 /* Free structures we are about to throw away so we can reuse the memory. */
74 
75 	if (i_called_before && SP) {
76 		delscreen(SP);
77 		SP = NULL;
78 	}
79 	if (newscreen(NULL, 0, 0, 0, stdout, stdin) == NULL) {
80 		(void) reset_shell_mode();
81 		if (term_errno != -1)
82 			termerr();
83 		else
84 			curserr();
85 		exit(1);
86 	}
87 
88 #ifdef	DEBUG
89 	if (outf)
90 		fprintf(outf, "initscr: term = %s\n", SP);
91 #endif	/* DEBUG */
92 	i_called_before = TRUE;
93 
94 #ifdef	SIGTSTP
95 	/*LINTED*/
96 	if ((savsignal = signal(SIGTSTP, SIG_IGN)) == SIG_DFL)
97 		(void) signal(SIGTSTP, _tstp);
98 	else
99 		(void) signal(SIGTSTP, savsignal);
100 #endif	/* SIGTSTP */
101 	/*LINTED*/
102 	if ((savsignal = signal(SIGINT, SIG_IGN)) == SIG_DFL)
103 		(void) signal(SIGINT, _ccleanup);
104 	else
105 		(void) signal(SIGINT, savsignal);
106 
107 	/*LINTED*/
108 	if ((savsignal = signal(SIGQUIT, SIG_IGN)) == SIG_DFL)
109 		(void) signal(SIGQUIT, _ccleanup);
110 	else
111 		(void) signal(SIGQUIT, savsignal);
112 
113 	return (stdscr);
114 }
115