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-rw-r--r--src/utils/indxbib/signal.c77
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diff --git a/src/utils/indxbib/signal.c b/src/utils/indxbib/signal.c
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+/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
+ Written by James Clark (jjc@jclark.com)
+
+This file is part of groff.
+
+groff is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+groff is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Unfortunately vendors seem to have problems writing a <signal.h>
+that is correct for C++, so we implement all signal handling in C. */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <sys/types.h>
+#include <signal.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Prototype */
+void catch_fatal_signals(void);
+
+extern void cleanup(void);
+
+static RETSIGTYPE handle_fatal_signal(int signum)
+{
+ signal(signum, SIG_DFL);
+ cleanup();
+#ifdef HAVE_KILL
+ kill(getpid(), signum);
+#else
+ /* MS-DOS and Win32 don't have kill(); the best compromise is
+ probably to use exit() instead. */
+ exit(signum);
+#endif
+}
+
+void catch_fatal_signals(void)
+{
+#ifdef SIGHUP
+ signal(SIGHUP, handle_fatal_signal);
+#endif
+ signal(SIGINT, handle_fatal_signal);
+ signal(SIGTERM, handle_fatal_signal);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#ifndef HAVE_RENAME
+
+void ignore_fatal_signals()
+{
+#ifdef SIGHUP
+ signal(SIGHUP, SIG_IGN);
+#endif
+ signal(SIGINT, SIG_IGN);
+ signal(SIGTERM, SIG_IGN);
+}
+
+#endif /* not HAVE_RENAME */