Is there anyone here with some ndk experience? I'm...

# android

[Tim Malseed]

Is there anyone here with some ndk experience? I'm desperate for some help getting fdsan to work..

I'm following the guide to ensure I handle file descriptors properly:
https://android.googlesource.com/platform/bionic/+/master/docs/fdsan.md

But when I try to implement unique_fd.h, I get the error 'use of undeclared identifier: android_fdsan_exchange_owner_tag '

unique_fd.h (Provided by me)

static void exchange_tag(int fd, uint64_t old_tag, uint64_t new_tag) {
    if (android_fdsan_exchange_owner_tag) { // Fails to compile
        android_fdsan_exchange_owner_tag(fd, old_tag, new_tag);
    }
}

This seems to be because this function is only available on API >= 29:

fdsan.h (Provided by the Android platform)

#if __ANDROID_API__ >= 29

/*
 * Exchange a file descriptor's tag.
 *
 * Logs and aborts if the fd's tag does not match expected_tag.
 */
void android_fdsan_exchange_owner_tag(int fd, uint64_t expected_tag, uint64_t new_tag) __INTRODUCED_IN(29) __attribute__((__weak__));