usr/src/lib/libcurses/screen/initscr.c

   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  *
  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 }