Bug 896 - Avoid race conditions reading message from exited process

Patch based on extensive work from Michael Meeks <michael.meeks@novell.com>,
thanks to Dafydd Harries <dafydd.harries@collabora.co.uk>,
Kimmo Hämäläinen <kimmo.hamalainen@nokia.com> and others.

The basic idea with this bug is that we effectively ignore errors
on write.  Only when we're done reading from a connection do we
close down a connection.  This avoids a race condition where
if a process (such as dbus-send) exited while we still had
data to read in the buffer, we'd miss that data.

1 files changed, 10 insertions, 0 deletions

diff --git a/dbus/dbus-sysdeps.c b/dbus/dbus-sysdeps.c
index e0fe8888..ccd80ccd 100644
--- a/dbus/dbus-sysdeps.c
+++ b/dbus/dbus-sysdeps.c
@@ -1078,6 +1078,16 @@ _dbus_get_is_errno_eintr (void)
 }
 
 /**
+ * See if errno is EPIPE
+ * @returns #TRUE if errno == EPIPE
+ */
+dbus_bool_t
+_dbus_get_is_errno_epipe (void)
+{
+  return errno == EPIPE;
+}
+
+/**
  * Get error message from errno
  * @returns _dbus_strerror(errno)
  */