diff options
| author | Stefan Hajnoczi <stefanha@redhat.com> | 2013-05-16 17:36:00 +0200 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2013-05-16 14:18:47 -0500 |
| commit | 8db165b36ef893ac69af0452f20eeb78e7b26b5a (patch) | |
| tree | 75e19a7e9017e41baeef3ef1d47d4b733cdce9aa | |
| parent | 6d46895b51103fa26c97ee0e0d895c004e9594d7 (diff) | |
main-loop: narrow win32 pollfds_fill() event bitmasks
pollfds_fill() and pollfds_poll() translate GPollFD to rfds/wfds/xfds
for sockets on win32. select(2) is the underlying system call which is
used to monitor sockets for activity.
Currently file descriptors that monitor G_IO_ERR will be included in
both rfds and wfds. As a result, select(2) will report writability on
file descriptors where we only really wanted to monitor readability
(with errors).
slirp_pollfds_poll() hit this issue: UDP sockets are blocking sockets so
we hang in sorecvfrom() when G_IO_ERR is set due to the socket being
writable (we only wanted to check for readability).
This patch fixes the slirp_pollfds_poll() hang.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1368718561-7816-2-git-send-email-stefanha@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
| -rw-r--r-- | main-loop.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/main-loop.c b/main-loop.c index f46aece8b8..2b8eed7311 100644 --- a/main-loop.c +++ b/main-loop.c @@ -333,11 +333,11 @@ static int pollfds_fill(GArray *pollfds, fd_set *rfds, fd_set *wfds, GPollFD *pfd = &g_array_index(pollfds, GPollFD, i); int fd = pfd->fd; int events = pfd->events; - if (events & (G_IO_IN | G_IO_HUP | G_IO_ERR)) { + if (events & G_IO_IN) { FD_SET(fd, rfds); nfds = MAX(nfds, fd); } - if (events & (G_IO_OUT | G_IO_ERR)) { + if (events & G_IO_OUT) { FD_SET(fd, wfds); nfds = MAX(nfds, fd); } @@ -360,10 +360,10 @@ static void pollfds_poll(GArray *pollfds, int nfds, fd_set *rfds, int revents = 0; if (FD_ISSET(fd, rfds)) { - revents |= G_IO_IN | G_IO_HUP | G_IO_ERR; + revents |= G_IO_IN; } if (FD_ISSET(fd, wfds)) { - revents |= G_IO_OUT | G_IO_ERR; + revents |= G_IO_OUT; } if (FD_ISSET(fd, xfds)) { revents |= G_IO_PRI; |