Add graph references

references/igraph-1.0.1/tests/unit/fatal_handler.c

@@ -0,0 +1,39 @@
+/*
+   igraph library.
+   Copyright (C) 2021-2022  The igraph development team <igraph@igraph.org>
+
+   This program 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 2 of the License, or
+   (at your option) any later version.
+
+   This program 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 <https://www.gnu.org/licenses/>.
+*/
+
+#include <igraph.h>
+#include <stdio.h>
+
+igraph_fatal_handler_t hanlder;
+
+void handler(const char *reason, const char *file, int line) {
+    printf("Reason: %s\nFile: %s\nLine: %d\n", reason, file, line);
+    exit(0); /* We use exit(0) instead of abort() to allow the test to succeed. */
+}
+
+int main(void) {
+    igraph_set_fatal_handler(&handler);
+
+    igraph_fatal("REASON", "FILENAME", 123);
+
+    /* The igraph_fatal() call must not return, so the following lines should not run. */
+
+    printf("This should not be printed.");
+
+    return 0;
+}