ncurses 5.6 - patch 20080927
[ncurses.git] / ncurses / tty / lib_tstp.c
index c850e41da2c2da122f5a71c40a5753b7048f145b..06c8411caa4d2a2891b63c3febc79b6d0d5e6ba9 100644 (file)
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998-2001,2002 Free Software Foundation, Inc.              *
+ * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -29,7 +29,7 @@
 /****************************************************************************
  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
- *     and: Thomas Dickey 1995-2001                                         *
+ *     and: Thomas E. Dickey                        1995-on                 *
  ****************************************************************************/
 
 /*
@@ -46,7 +46,7 @@
 #define _POSIX_SOURCE
 #endif
 
-MODULE_ID("$Id: lib_tstp.c,v 1.30 2002/05/18 19:55:38 tom Exp $")
+MODULE_ID("$Id: lib_tstp.c,v 1.37 2008/05/03 16:24:56 tom Exp $")
 
 #if defined(SIGTSTP) && (HAVE_SIGACTION || HAVE_SIGVEC)
 #define USE_SIGTSTP 1
@@ -234,14 +234,12 @@ tstp(int dummy GCC_UNUSED)
 static void
 cleanup(int sig)
 {
-    static int nested;
-
     /*
      * Actually, doing any sort of I/O from within an signal handler is
      * "unsafe".  But we'll _try_ to clean up the screen and terminal
      * settings on the way out.
      */
-    if (!nested++
+    if (!_nc_globals.cleanup_nested++
        && (sig == SIGINT
            || sig == SIGQUIT)) {
 #if HAVE_SIGACTION || HAVE_SIGVEC
@@ -254,19 +252,17 @@ cleanup(int sig)
        if (signal(sig, SIG_IGN) != SIG_ERR)
 #endif
        {
-           SCREEN *scan = _nc_screen_chain;
-           while (scan) {
-               if (SP != 0
-                   && SP->_ofp != 0
-                   && isatty(fileno(SP->_ofp))) {
-                   SP->_cleanup = TRUE;
-                   SP->_outch = _nc_outch;
+           SCREEN *scan;
+           for (each_screen(scan)) {
+               if (scan->_ofp != 0
+                   && isatty(fileno(scan->_ofp))) {
+                   scan->_cleanup = TRUE;
+                   scan->_outch = _nc_outch;
                }
                set_term(scan);
                endwin();
                if (SP)
                    SP->_endwin = FALSE;        /* in case we have an atexit! */
-               scan = scan->_next_screen;
            }
        }
     }
@@ -277,11 +273,7 @@ cleanup(int sig)
 static void
 sigwinch(int sig GCC_UNUSED)
 {
-    SCREEN *scan = _nc_screen_chain;
-    while (scan) {
-       scan->_sig_winch = TRUE;
-       scan = scan->_next_screen;
-    }
+    _nc_globals.have_sigwinch = 1;
 }
 #endif /* USE_SIGWINCH */
 
@@ -355,29 +347,27 @@ CatchIfDefault(int sig, RETSIGTYPE (*handler) (int))
 NCURSES_EXPORT(void)
 _nc_signal_handler(bool enable)
 {
-    static bool initialized = FALSE;
-
     T((T_CALLED("_nc_signal_handler(%d)"), enable));
 #if USE_SIGTSTP                        /* Xenix 2.x doesn't have SIGTSTP, for example */
     {
        static bool ignore_tstp = FALSE;
 
        if (!ignore_tstp) {
-           static sigaction_t act, oact;
+           static sigaction_t new_sigaction, old_sigaction;
 
            if (!enable) {
-               act.sa_handler = SIG_IGN;
-               sigaction(SIGTSTP, &act, &oact);
-           } else if (act.sa_handler != SIG_DFL) {
-               sigaction(SIGTSTP, &oact, NULL);
-           } else if (sigaction(SIGTSTP, NULL, &oact) == 0
-                      && (oact.sa_handler == SIG_DFL)) {
-               sigemptyset(&act.sa_mask);
+               new_sigaction.sa_handler = SIG_IGN;
+               sigaction(SIGTSTP, &new_sigaction, &old_sigaction);
+           } else if (new_sigaction.sa_handler != SIG_DFL) {
+               sigaction(SIGTSTP, &old_sigaction, NULL);
+           } else if (sigaction(SIGTSTP, NULL, &old_sigaction) == 0
+                      && (old_sigaction.sa_handler == SIG_DFL)) {
+               sigemptyset(&new_sigaction.sa_mask);
 #ifdef SA_RESTART
-               act.sa_flags |= SA_RESTART;
+               new_sigaction.sa_flags |= SA_RESTART;
 #endif /* SA_RESTART */
-               act.sa_handler = tstp;
-               (void) sigaction(SIGTSTP, &act, NULL);
+               new_sigaction.sa_handler = tstp;
+               (void) sigaction(SIGTSTP, &new_sigaction, NULL);
            } else {
                ignore_tstp = TRUE;
            }
@@ -385,14 +375,14 @@ _nc_signal_handler(bool enable)
     }
 #endif /* !USE_SIGTSTP */
 
-    if (!initialized) {
+    if (!_nc_globals.init_signals) {
        if (enable) {
            CatchIfDefault(SIGINT, cleanup);
            CatchIfDefault(SIGTERM, cleanup);
 #if USE_SIGWINCH
            CatchIfDefault(SIGWINCH, sigwinch);
 #endif
-           initialized = TRUE;
+           _nc_globals.init_signals = TRUE;
        }
     }
     returnVoid;