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-rw-r--r--lib/sockets.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/sockets.c b/lib/sockets.c
index 25ab97f3d..432f3b584 100644
--- a/lib/sockets.c
+++ b/lib/sockets.c
@@ -37,6 +37,10 @@ close_fd_maybe_socket (const struct fd_hook *remaining_list,
gl_close_fn primary,
int fd)
{
+ /* Note about multithread-safety: There is a race condition where, between
+ our calls to closesocket() and the primary close(), some other thread
+ could make system calls that allocate precisely the same HANDLE value
+ as sock; then the primary close() would call CloseHandle() on it. */
SOCKET sock;
WSANETWORKEVENTS ev;