net: fix sendfile for Solaris
If a retryable error such as EAGAIN/EINTR is encountered during a call to sendfile(), we should not assume that a partial write occurred. Instead, just like any other platform, we should always try again even if 0 bytes were written. Fixes #20857 Change-Id: I9aa48d193c27c6794c550320da4d3f7544041f37 Reviewed-on: https://go-review.googlesource.com/47351 Run-TryBot: Shawn Walker-Salas <shawn.walker@oracle.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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