Merge "libbinder: detach ParcelFileDescriptor comm" am: a6d2152f am: ae209feb

    int32_t hasComm = readInt32();

    int fd = readFileDescriptor();

    if (hasComm != 0) {

        // skip

        readFileDescriptor();

        // detach (owned by the binder driver)

        int comm = readFileDescriptor();

        // warning: this must be kept in sync with:

        // frameworks/base/core/java/android/os/ParcelFileDescriptor.java

        enum ParcelFileDescriptorStatus {

            DETACHED = 2,

        };

#if BYTE_ORDER == BIG_ENDIAN

        const int32_t message = ParcelFileDescriptorStatus::DETACHED;

#endif

#if BYTE_ORDER == LITTLE_ENDIAN

        const int32_t message = __builtin_bswap32(ParcelFileDescriptorStatus::DETACHED);

#endif

        ssize_t written = TEMP_FAILURE_RETRY(

            ::write(comm, &message, sizeof(message)));

        if (written == -1 || written != sizeof(message)) {

            ALOGW("Failed to detach ParcelFileDescriptor written: %zd err: %s",

                written, strerror(errno));

            return BAD_TYPE;

        }

    }

    return fd;

}