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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-03-14 20:15:21 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-03-15 14:54:27 -0400
commit00a8cf7763ec5e132efd4c974fbc6530c82240d0 (patch)
treef03f8725f75ac6cce03f4b073adb04e2ee522998 /units/systemd-hostnamed.service.in
parentce33fddad0806f859ff7324527ee0525dd10455e (diff)
basic/copy: use sendfile smarter
We called sendfile with 16kb (a.k.a. COPY_BUFFER_SIZE) as the maximum number of bytes to copy. This seems rather inefficient, especially with large files. Instead, call sendfile with a "large" maximum. What "large" max means is a bit tricky: current file offset + max must fit in loff_t. This means that as we call sendfile more than once, we have to lower the max size. With this patch, test-copy calls sendfile twice, e.g.: sendfile(4, 3, NULL, 9223372036854775807) = 738760 sendfile(4, 3, NULL, 9223372036854037047) = 0 The second call is necessary to determine EOF.
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