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Add comments for the new xsendfile. - geomyidae - A small C-based gopherd. |
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git clone git://bitreich.org/geomyidae/ git://enlrupgkhuxnvlhsf6lc3fziv5h2hhfri… |
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--- |
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commit 8b62f1e60e9774368bfdb209f3bebc8f51d6e0b8 |
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parent b92f702f27e642838e51e8b308c482c08ebdc786 |
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Author: Christoph Lohmann <[email protected]> |
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Date: Sun, 24 Sep 2017 18:35:50 +0200 |
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Add comments for the new xsendfile. |
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Diffstat: |
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M ind.c | 10 ++++++++++ |
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1 file changed, 10 insertions(+), 0 deletions(-) |
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--- |
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diff --git a/ind.c b/ind.c |
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@@ -60,16 +60,21 @@ xsendfile(int fd, int sock) |
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size_t bufsiz = BUFSIZ, count = 0; |
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int len, sent, optval; |
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+/* Tell the kernel to not send small packets on every write. */ |
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#ifdef TCP_CORK |
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optval = 1; |
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setsockopt(sock, IPPROTO_TCP, TCP_CORK, &optval, sizeof(int)); |
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#endif |
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+/* TCP_CORK for FreeBSD */ |
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#ifdef TCP_NOPUSH |
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optval = 1; |
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setsockopt(sock, IPPROTO_TCP, TCP_NOPUSH, &optval, sizeof(int)); |
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#endif |
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+/* |
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+ * Disable Nagle algorithm, which means to sent segments as soon as possible. |
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+ */ |
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#ifdef TCP_NODELAY |
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optval = 0; |
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setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &optval, sizeof(int)); |
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@@ -81,6 +86,10 @@ xsendfile(int fd, int sock) |
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count = st.st_size; |
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} |
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+/* |
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+ * If we are on the said operating systems, use some special method for data |
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+ * transfer. |
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+ */ |
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#if !defined(__linux__) && !defined(__FreeBSD__) && !defined(__DragonFly__) |
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count = 0; |
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#endif |
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@@ -101,6 +110,7 @@ xsendfile(int fd, int sock) |
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return 0; |
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} |
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+/* Different sendfile(2) implementations on different platforms. :/ */ |
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#ifdef __linux__ |
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return sendfile(sock, fd, NULL, count); |
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#endif |
