RFR: 8292562: (fc) Use copy_file_range in FileChannel::transferTo on Linux

[Brian Burkhalter]

On Fri, 19 Aug 2022 06:41:19 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Add `copy_file_range(2)` to the native Linux implementation of `FileChannel::transferTo`.
>
> src/java.base/unix/native/libnio/ch/FileChannelImpl.c line 182:
> 
>> 180:     jlong n;
>> 181:     if (my_copy_file_range_func != NULL) {
>> 182:         n = my_copy_file_range_func(srcFD, &offset, dstFD, NULL, count, 0);
> 
> I assume count will need to be cast to size_t for this to compile on all architectures.

Fixed in ee29211e7ebdfc6d9127bcf093de2a475f9c1a3a.

> src/java.base/unix/native/libnio/ch/FileChannelImpl.c line 186:
> 
>> 184:             switch (errno) {
>> 185:                 case EINTR:
>> 186:                 case EINVAL:
> 
> For EINTR we could return IOS_INTERRUPTED if you want.

So changed in ee29211e7ebdfc6d9127bcf093de2a475f9c1a3a.

-------------

PR: https://git.openjdk.org/jdk/pull/9925