1 files changed, 46 insertions, 0 deletions
diff --git a/tests/common/fopen_failure.c b/tests/common/fopen_failure.c
new file mode 100644
index 0000000..750cd66
--- /dev/null
+++ b/tests/common/fopen_failure.c
@@ -0,0 +1,46 @@
+/* 
+ * gcc fopen_failure.c -o fopen_failure.so -shared -ldl 
+ * LD_PRELOAD=./fopen_failure.so FAILURE_PATH=/etc/shadow ./test /etc/shadow
+ */
+
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+
+typedef FILE * (*fopen_type) (const char *path, const char *mode);
+static fopen_type next_fopen;
+
+static const char *failure_path = NULL;
+
+FILE *fopen64 (const char *path, const char *mode)
+{
+printf ("fopen64(%s, %s)\n", path, mode);
+	if (NULL == next_fopen)
+	{
+		next_fopen = dlsym (RTLD_NEXT, "fopen64");
+		assert (NULL != next_fopen);
+	}
+	if (NULL == failure_path) {
+		failure_path = getenv ("FAILURE_PATH");
+		if (NULL == failure_path) {
+			fputs ("No FAILURE_PATH defined\n", stderr);
+		}
+	}
+
+	if (   (NULL != path)
+	    && (NULL != failure_path)
+	    && (strcmp (path, failure_path) == 0))
+	{
+		fprintf (stderr, "fopen64 FAILURE %s %s ...\n", path, mode);
+		errno = EIO;
+		return NULL;
+	}
+
+	return next_fopen (path, mode);
+}
+