1 files changed, 62 insertions, 0 deletions
diff --git a/tests/common/unlinkat_failure.c b/tests/common/unlinkat_failure.c
new file mode 100644
index 0000000..5b8bf95
--- /dev/null
+++ b/tests/common/unlinkat_failure.c
@@ -0,0 +1,62 @@
+/* 
+ * gcc unlinkat_failure.c -o unlinkat_failure.so -shared -ldl 
+ * LD_PRELOAD=./unlinkat_failure.so FAILURE_PATH=/etc/shadow ./test /etc/shadow
+ */
+
+#define _GNU_SOURCE
+#include <dlfcn.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdarg.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+typedef int (*unlinkat_type) (int dirfd, const char *pathname, int flags);
+static unlinkat_type next_unlinkat;
+
+static const char *failure_path = NULL;
+static dev_t failure_dev = -1;
+static ino_t failure_ino = -1;
+
+int unlinkat (int dirfd, const char *pathname, int flags)
+{
+	if (NULL == next_unlinkat)
+	{
+		next_unlinkat = dlsym (RTLD_NEXT, "unlinkat");
+		assert (NULL != next_unlinkat);
+	}
+	if (NULL == failure_path) {
+		struct stat sb;
+		failure_path = getenv ("FAILURE_PATH");
+		if (NULL == failure_path) {
+			fputs ("No FAILURE_PATH defined\n", stderr);
+		}
+		if (lstat (failure_path, &sb) != 0) {
+			fputs ("Can't lstat FAILURE_PATH\n", stderr);
+		}
+		failure_dev = sb.st_dev;
+		failure_ino = sb.st_ino;
+	}
+
+	if (   (NULL != pathname)
+	    && (NULL != failure_path)) {
+		struct stat sb;
+		if (   (fstatat (dirfd, pathname, &sb, flags) == 0)
+		    && (sb.st_dev == failure_dev)
+		    && (sb.st_ino == failure_ino)) {
+			fprintf (stderr, "unlinkat FAILURE %s\n", failure_path);
+			errno = EBUSY;
+			return -1;
+		}
+	}
+
+	return next_unlinkat (dirfd, pathname, flags);
+}
+