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net.cc (fdsock): Fix comment

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Corinna Vinschen 2015-12-15 18:12:49 +01:00
parent ba8d6a595a
commit 0f5afe895f
1 changed files with 8 additions and 11 deletions
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winsup/cygwin/net.cc
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@ -534,18 +534,15 @@ fdsock (cygheap_fdmanip& fd, const device *dev, SOCKET soc)
SetHandleInformation. Subsequent socket calls in the child process fail
with error 10038, WSAENOTSOCK.
The only way up to Windows Server 2003 to make these sockets usable in
child processes is to duplicate them via WSADuplicateSocket/WSASocket
calls. This requires to start the child process in SUSPENDED state so
we only do this on affected systems. If we recognize a non-inheritable
socket we switch to inheritance/dup via WSADuplicateSocket/WSASocket for
that socket.
There's a neat way to workaround these annoying LSP sockets. WSAIoctl
allows to fetch the underlying base socket, which is a normal, inheritable
IFS handle. So we fetch the base socket, duplicate it, and close the
original socket. Now we have a standard IFS socket which (hopefully)
works as expected.
Starting with Vista there's another neat way to workaround these annoying
LSP sockets. WSAIoctl allows to fetch the underlying base socket, which
is a normal, inheritable IFS handle. So we fetch the base socket,
duplicate it, and close the original socket. Now we have a standard IFS
socket which (hopefully) works as expected. */
If that doesn't work for some reason, mark the sockets for duplication
via WSADuplicateSocket/WSASocket. This requires to start the child
process in SUSPENDED state so we only do this if really necessary. */
DWORD flags;
bool fixup = false;
if (!GetHandleInformation ((HANDLE) soc, &flags)