Add basic readlink command
Change-Id: I693c1098e6c6d107a9e97285bf826ab153a1c8f0
diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index f60037d..75ce53f 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -68,7 +68,8 @@
load_policy \
swapon \
swapoff \
- mkswap
+ mkswap \
+ readlink
ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
TOOLS += r
diff --git a/toolbox/readlink.c b/toolbox/readlink.c
new file mode 100644
index 0000000..9c1ab95
--- /dev/null
+++ b/toolbox/readlink.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2013, The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of Google, Inc. 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void usage(char* name) {
+ fprintf(stderr, "Usage: %s FILE\n", name);
+}
+
+int readlink_main(int argc, char* argv[]) {
+ if (argc != 2) {
+ usage(argv[0]);
+ return EXIT_FAILURE;
+ }
+
+ char name[PATH_MAX+1];
+ ssize_t len = readlink(argv[1], name, PATH_MAX);
+
+ if (len < 0) {
+ perror("readlink");
+ return EXIT_FAILURE;
+ }
+
+ name[len] = '\0';
+ printf("%s\n", name);
+
+ return EXIT_SUCCESS;
+}