Document more errno(s) on ADnsHelper_ API
Address comments from android-api-council review.
Bug: 310992535
Change-Id: I722725bd3d3a3df1687721175e9434efae9da37a
Test: presubmit
diff --git a/DnsResolver/include/DnsHelperPublic.h b/DnsResolver/include/DnsHelperPublic.h
index 7c9fc9e..44b0012 100644
--- a/DnsResolver/include/DnsHelperPublic.h
+++ b/DnsResolver/include/DnsHelperPublic.h
@@ -25,7 +25,8 @@
* Perform any required initialization - including opening any required BPF maps. This function
* needs to be called before using other functions of this library.
*
- * Returns 0 on success, a negative POSIX error code (see errno.h) on other failures.
+ * Returns 0 on success, -EOPNOTSUPP when the function is called on the Android version before
+ * T. Returns a negative POSIX error code (see errno.h) on other failures.
*/
int ADnsHelper_init();
@@ -36,7 +37,9 @@
* |uid| is a Linux/Android UID to be queried. It is a combination of UserID and AppID.
* |metered| indicates whether the uid is currently using a billing network.
*
- * Returns 0(false)/1(true) on success, a negative POSIX error code (see errno.h) on other failures.
+ * Returns 0(false)/1(true) on success, -EUNATCH when the ADnsHelper_init is not called before
+ * calling this function. Returns a negative POSIX error code (see errno.h) on other failures
+ * that return from bpf syscall.
*/
int ADnsHelper_isUidNetworkingBlocked(uid_t uid, bool metered);