Initial import of the CDE 2.1.30 sources from the Open Group.

cde/lib/DtSearch/userint.c

@@ -0,0 +1,122 @@
+/*
+ *   COMPONENT_NAME: austext
+ *
+ *   FUNCTIONS: flag_shutdown
+ *              init_user_interrupt
+ *              main
+ *              user_interrupt
+ *
+ *   ORIGINS: 27
+ *
+ *   (C) COPYRIGHT International Business Machines Corp. 1992,1995
+ *   All Rights Reserved
+ *   US Government Users Restricted Rights - Use, duplication or
+ *   disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
+ */
+/******************** USERINT.C *************************
+ * $XConsortium: userint.c /main/5 1996/05/07 13:49:00 drk $
+ * April 1992.
+ * 
+ * Init_user_interrupt() initializes interrupt handler.
+ * 
+ * User_interrupt() returns TRUE if any of several signals
+ * has been received anytime since initialization or last call.
+ * These occur when user pushes CTRL-C, CTRL-BREAK,
+ * or when process is killed by external process.
+ * It's usually called in a major loop in a program at a place
+ * where it is convenient to allow a graceful exit.  
+ * SIGHUP is not trapped because this module is only used in
+ * offline programs and users often want to nohup their
+ * offline scripts.
+ * 
+ * Replaces quit_escape() after version 4.0 because
+ * quit_escape() only worked on dos platform because of
+ * the dependency on conio/curses functions.
+ * Current user_interrupt() works on all C platforms.
+ *
+ * $Log$
+ * Revision 2.4  1996/03/13  22:59:54  miker
+ * Removed trap of SIGABRT to enable external kills with core dump.
+ *
+ * Revision 2.3  1996/02/01  19:28:30  miker
+ * Made shutdown_now flag volatile.
+ *
+ * Revision 2.2  1995/10/25  15:03:09  miker
+ * Added prolog.
+ *
+ * Revision 2.1  1995/09/22  22:21:36  miker
+ * Freeze DtSearch 0.1, AusText 2.1.8
+ *
+ * Revision 1.2  1995/09/05  19:18:14  miker
+ * Minor name changes for DtSearch.
+ */
+#include "SearchP.h"
+#include <signal.h>
+
+/***********#define INCLUDE_MAIN******************/
+
+
+volatile int	shutdown_now = 0;	/* i.e. FALSE */
+
+/************************************************/
+/*						*/
+/*		   flag_shutdown		*/
+/*						*/
+/************************************************/
+/* interrupt handler for termination signals */
+static void     flag_shutdown (int sig)
+{
+    shutdown_now = sig;
+    return;
+}
+
+/************************************************/
+/*						*/
+/*		init_user_interrupt		*/
+/*						*/
+/************************************************/
+void            init_user_interrupt (void)
+{
+    signal (SIGINT, flag_shutdown);	/* interrupt (ctrl-c) */
+    signal (SIGQUIT, flag_shutdown);	/* quit (ctrl-d) */
+    signal (SIGTRAP, flag_shutdown);	/* trace trap */
+    signal (SIGKILL, flag_shutdown);	/* kill -9, cannot be trapped */
+    signal (SIGALRM, flag_shutdown);	/* called alarm() polling timer */
+    signal (SIGTERM, flag_shutdown);	/* kill [-15], sfwr terminate */
+    signal (SIGPWR, flag_shutdown);	/* power failure imminent */
+    signal (SIGUSR1, flag_shutdown);	/* kill -30, "pings" OE */
+#ifdef _AIX
+    signal (SIGXCPU, flag_shutdown);	/* cpu time limit exceeded */
+    signal (SIGDANGER, flag_shutdown);	/* out of paging space,
+					 * crash immin */
+#endif
+    return;
+}  /* init_user_interrupt() */
+
+/************************************************/
+/*						*/
+/*		  user_interrupt		*/
+/*						*/
+/************************************************/
+int             user_interrupt (void)
+{ return shutdown_now; }
+
+
+
+#ifdef INCLUDE_MAIN
+/******************** main for testing ****************************/
+main ()
+{
+    int             done = FALSE;
+    int             i = 0;
+
+    init_user_interrupt ();
+    while (!user_interrupt ())
+	printf ("\r%5d: Push CTRL-C or CTRL-BREAK to exit... ", ++i);
+    printf ("\nWhew!  Thank-you.\n");
+    return;
+}  /* main() */
+
+#endif
+
+/******************** USERINT.C *************************/