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* net.cc (fdsock): Disable raising buffer sizes. Add comment to

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explain why.
This commit is contained in:
Corinna Vinschen
2006-06-12 13:13:52 +00:00
parent d73228210d
commit 8f56da762a
2 changed files with 18 additions and 2 deletions
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5
winsup/cygwin/ChangeLog
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@@ -1,3 +1,8 @@
2006-06-12 Corinna Vinschen <corinna@vinschen.de>
* net.cc (fdsock): Disable raising buffer sizes. Add comment to
explain why.
2006-06-04 Christopher Faylor <cgf@timesys.com>
* ioctl.cc (ioctl): Accommodate change in reported pty master device

15
winsup/cygwin/net.cc
View File

@@ -557,15 +557,26 @@ fdsock (cygheap_fdmanip& fd, const device *dev, SOCKET soc)
fd->uninterruptible_io (true);
cygheap->fdtab.inc_need_fixup_before ();
debug_printf ("fd %d, name '%s', soc %p", (int) fd, dev->name, soc);
#if 0
/* Same default buffer sizes as on Linux (instead of WinSock default 8K).
NOT. If the SO_RCVBUF size exceeds 65535(*), and if the socket is
connected to a remote machine, then duplicating the socket on
fork/exec fails with WinSock error 10022, WSAEINVAL. Given that,
there's not any good reason to set the buffer sizes at all. So we
stick with the defaults. However, an explanation for this weird
behaviour would be nice. I keep this stuff in the code for later
generations. Archeological programmers might find it useful.
(*) Maximum normal TCP window size. Coincidence? */
/* Same default buffer sizes as on Linux (instead of WinSock default 8K). */
int rmem = dev == tcp_dev ? 87380 : 120832;
int wmem = dev == tcp_dev ? 16384 : 120832;
if (::setsockopt (soc, SOL_SOCKET, SO_RCVBUF, (char *) &rmem, sizeof (int)))
debug_printf ("setsockopt(SO_RCVBUF) failed, %lu", WSAGetLastError ());
if (::setsockopt (soc, SOL_SOCKET, SO_SNDBUF, (char *) &wmem, sizeof (int)))
debug_printf ("setsockopt(SO_SNDBUF) failed, %lu", WSAGetLastError ());
#endif
return true;
}