BSD 4.4 Lite Lib Sources

1 files changed, 124 insertions, 0 deletions

diff --git a/lib/libcurses/tstp.c b/lib/libcurses/tstp.c
new file mode 100644
index 0000000..3a81751
--- /dev/null
+++ b/lib/libcurses/tstp.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 1981, 1993
+ *	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.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)tstp.c	8.2 (Berkeley) 1/2/94";
+#endif /* not lint */
+
+#include <curses.h>
+#include <errno.h>
+#include <signal.h>
+#include <termios.h>
+#include <unistd.h>
+
+
+/*
+ * stop_signal_handler --
+ *	Handle stop signals.
+ */
+void
+__stop_signal_handler(signo)
+	int signo;
+{
+	struct termios save;
+	sigset_t oset, set;
+
+	/* Get the current terminal state (which the user may have changed). */
+	if (tcgetattr(STDIN_FILENO, &save))
+		return;
+
+	/*
+	 * Block window change and timer signals.  The latter is because
+	 * applications use timers to decide when to repaint the screen.
+	 */
+	(void)sigemptyset(&set);
+	(void)sigaddset(&set, SIGALRM);
+	(void)sigaddset(&set, SIGWINCH);
+	(void)sigprocmask(SIG_BLOCK, &set, &oset);
+	
+	/*
+	 * End the window, which also resets the terminal state to the
+	 * original modes.
+	 */
+	endwin();
+
+	/* Unblock SIGTSTP. */
+	(void)sigemptyset(&set);
+	(void)sigaddset(&set, SIGTSTP);
+	(void)sigprocmask(SIG_UNBLOCK, &set, NULL);
+
+	/* Stop ourselves. */
+	__restore_stophandler();
+	(void)kill(0, SIGTSTP);
+
+	/* Time passes ... */
+
+	/* Reset the curses SIGTSTP signal handler. */
+	__set_stophandler();
+
+	/* save the new "default" terminal state */
+	(void)tcgetattr(STDIN_FILENO, &__orig_termios);
+
+	/* Reset the terminal state to the mode just before we stopped. */
+	(void)tcsetattr(STDIN_FILENO, __tcaction ?
+	    TCSASOFT | TCSADRAIN : TCSADRAIN, &save);
+
+	/* Restart the screen. */
+	__startwin();
+
+	/* Repaint the screen. */
+	wrefresh(curscr);
+
+	/* Reset the signals. */
+	(void)sigprocmask(SIG_SETMASK, &oset, NULL);
+}
+
+static void (*otstpfn)() = SIG_DFL;
+
+/*
+ * Set the TSTP handler.
+ */
+void
+__set_stophandler()
+{
+	otstpfn = signal(SIGTSTP, __stop_signal_handler);
+}
+
+/*
+ * Restore the TSTP handler.
+ */
+void
+__restore_stophandler()
+{
+	(void)signal(SIGTSTP, otstpfn);
+}