FileChannelImpl.c

JNIEXPORT jlong JNICALL
Java_sun_nio_ch_FileChannelImpl_transferTo0(JNIEnv *env, jobject this,
                                            jint srcFD,
                                            jlong position, jlong count,
                                            jint dstFD)
{
#ifdef __linux__
    jlong max = (jlong)java_lang_Integer_MAX_VALUE;
    jlong n;

    if (my_sendfile64_func == NULL) {
        off_t offset;
        if (position > max)
            return IOS_UNSUPPORTED_CASE;
        if (count > max)
            count = max;
        offset = (off_t)position;
        n = sendfile(dstFD, srcFD, &offset, (size_t)count);
    } else {
        off64_t offset = (off64_t)position;
        n = (*my_sendfile64_func)(dstFD, srcFD, &offset, (size_t)count);
    }
    if (n < 0) {
        if (errno == EAGAIN)
            return IOS_UNAVAILABLE;
        if ((errno == EINVAL) && ((ssize_t)count >= 0))
            return IOS_UNSUPPORTED_CASE;
        if (errno == EINTR) {
            return IOS_INTERRUPTED;
        }
        JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
        return IOS_THROWN;
    }
    return n;
#endif

#ifdef __solaris__
    if (my_sendfile_func == NULL) {
        return IOS_UNSUPPORTED;
    } else {
        sendfilevec_t sfv;
        size_t numBytes = 0;
        jlong result;

        sfv.sfv_fd = srcFD;
        sfv.sfv_flag = 0;
        sfv.sfv_off = (off64_t)position;
        sfv.sfv_len = count;

        result = (*my_sendfile_func)(dstFD, &sfv, 1, &numBytes);

        /* Solaris sendfilev() will return -1 even if some bytes have been
         * transferred, so we check numBytes first.
         */
        if (numBytes > 0)
            return numBytes;
        if (result < 0) {
            if (errno == EAGAIN)
                return IOS_UNAVAILABLE;
            if ((errno == EINVAL) && ((ssize_t)count >= 0))
                return IOS_UNSUPPORTED_CASE;
            if (errno == EINTR)
                return IOS_INTERRUPTED;
            JNU_ThrowIOExceptionWithLastError(env, "Transfer failed");
            return IOS_THROWN;
        }
        return result;
    }
#endif
}