1 files changed, 193 insertions, 0 deletions

diff --git a/lib/libedit/sig.c b/lib/libedit/sig.c
new file mode 100644
index 000000000000..94ab4bb8380b
--- /dev/null
+++ b/lib/libedit/sig.c
@@ -0,0 +1,193 @@
+/*-
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Christos Zoulas of Cornell University.
+ *
+ * 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.
+ */
+
+#if !defined(lint) && !defined(SCCSID)
+static char sccsid[] = "@(#)sig.c	8.1 (Berkeley) 6/4/93";
+#endif /* not lint && not SCCSID */
+
+/*
+ * sig.c: Signal handling stuff.
+ *	  our policy is to trap all signals, set a good state
+ *	  and pass the ball to our caller.
+ */
+#include "sys.h"
+#include "el.h"
+#include <stdlib.h>
+
+private EditLine *sel = NULL;
+
+private int sighdl[] = {
+#define _DO(a)	(a),
+    ALLSIGS
+#undef _DO
+    -1
+};
+
+private void sig_handler	__P((int));
+
+/* sig_handler():
+ *	This is the handler called for all signals
+ *	XXX: we cannot pass any data so we just store the old editline
+ *	state in a private variable
+ */
+private void
+sig_handler(signo)
+    int signo;
+{
+    int i;
+    sigset_t nset, oset;
+
+    (void) sigemptyset(&nset);
+    (void) sigaddset(&nset, signo);
+    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
+
+    switch (signo) {
+    case SIGCONT:
+	tty_rawmode(sel);
+	if (ed_redisplay(sel, 0) == CC_REFRESH)
+	    re_refresh(sel);
+	term__flush();
+	break;
+
+    case SIGWINCH:
+	el_resize(sel);
+	break;
+
+    default:
+	tty_cookedmode(sel);
+	break;
+    }
+
+    for (i = 0; sighdl[i] != -1; i++) 
+	if (signo == sighdl[i])
+	    break;
+
+    (void) signal(signo, sel->el_signal[i]);
+    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
+    (void) kill(0, signo);
+}
+
+
+/* sig_init():
+ *	Initialize all signal stuff
+ */
+protected int
+sig_init(el)
+    EditLine *el;
+{
+    int i;
+    sigset_t nset, oset;
+
+    (void) sigemptyset(&nset);
+#define _DO(a) (void) sigaddset(&nset, SIGWINCH);
+    ALLSIGS
+#undef _DO
+    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
+
+#define SIGSIZE (sizeof(sighdl) / sizeof(sighdl[0]) * sizeof(sig_t))
+
+    el->el_signal = (sig_t *) el_malloc(SIGSIZE);
+    for (i = 0; sighdl[i] != -1; i++) 
+	el->el_signal[i] = BADSIG;
+
+    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
+
+    return 0;
+}
+
+
+/* sig_end():
+ *	Clear all signal stuff
+ */
+protected void
+sig_end(el)
+    EditLine *el;
+{
+    el_free((ptr_t) el->el_signal);
+    el->el_signal = NULL;
+}
+
+
+/* sig_set():
+ *	set all the signal handlers
+ */
+protected void
+sig_set(el)
+    EditLine *el;
+{
+    int i;
+    sigset_t nset, oset;
+
+    (void) sigemptyset(&nset);
+#define _DO(a) (void) sigaddset(&nset, SIGWINCH);
+    ALLSIGS
+#undef _DO
+    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
+
+    for (i = 0; sighdl[i] != -1; i++) {
+	sig_t s;
+	/* This could happen if we get interrupted */
+	if ((s = signal(sighdl[i], sig_handler)) != sig_handler)
+	    el->el_signal[i] = s;
+    }
+    sel = el;
+    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
+}
+
+
+/* sig_clr():
+ *	clear all the signal handlers
+ */
+protected void
+sig_clr(el)
+    EditLine *el;
+{
+    int i;
+    sigset_t nset, oset;
+
+    (void) sigemptyset(&nset);
+#define _DO(a) (void) sigaddset(&nset, SIGWINCH);
+    ALLSIGS
+#undef _DO
+    (void) sigprocmask(SIG_BLOCK, &nset, &oset);
+
+    for (i = 0; sighdl[i] != -1; i++) 
+	if (el->el_signal[i] != BADSIG)
+	    (void) signal(sighdl[i], el->el_signal[i]);
+
+    sel = NULL;	/* we are going to die if the handler is called */
+    (void) sigprocmask(SIG_SETMASK, &oset, NULL);
+}