diff options
| author |   Paolo Bonzini <pbonzini@redhat.com> | 2010-06-23 18:30:15 +0200 |
|---|---|---|
| committer |   Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-07-26 10:05:05 -0700 |
| commit | 6280f190da4dd083f14f704be6b3314311a7eacb (patch) | |
| tree | 23b80ccd862117688eafa4c52ae6ad61fda2f082 /drivers/xen | |
| parent | xenbus: do not hold transaction_mutex when returning to userspace (diff) | |
| download | linux-dev-6280f190da4dd083f14f704be6b3314311a7eacb.tar.xz linux-dev-6280f190da4dd083f14f704be6b3314311a7eacb.zip | |
implement O_NONBLOCK for /proc/xen/xenbus
This patch implements O_NONBLOCK for /proc/xen/xenbus. It is a simple
matter of returning -EAGAIN instead of waiting on a queue.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/xenfs/xenbus.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/xen/xenfs/xenbus.c b/drivers/xen/xenfs/xenbus.c index a9592d981b10..9d5b519d2e4c 100644 --- a/drivers/xen/xenfs/xenbus.c +++ b/drivers/xen/xenfs/xenbus.c @@ -122,6 +122,9 @@ static ssize_t xenbus_file_read(struct file *filp, mutex_lock(&u->reply_mutex); while (list_empty(&u->read_buffers)) { mutex_unlock(&u->reply_mutex); + if (filp->f_flags & O_NONBLOCK) + return -EAGAIN; + ret = wait_event_interruptible(u->read_waitq, !list_empty(&u->read_buffers)); if (ret) |