next_xevent don't block anymore!

Now the next_xevent (from the safex11) will not block forever. So we
can listen the socket without doing some thread stuff.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/safe_x11/safex11.c b/src/safe_x11/safex11.c
new file mode 100644
index 0000000..e4f87d8
--- /dev/null
+++ b/src/safe_x11/safex11.c
@@ -0,0 +1,32 @@
+#include "safex11.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xutil.h>
+
+int select_next_event(Display *display, int x11_fd, XEvent *retval)
+{
+    fd_set in_fds;
+    struct timeval tv;
+    XEvent ev;
+    /* check if there're some events on the queue first of all. */
+    if(XPending(display) > 0)
+        goto EVENT_QUEUED;
+
+    FD_ZERO(&in_fds);
+    FD_SET(x11_fd, &in_fds);
+
+    /* one second */
+    tv.tv_usec = 0;
+    tv.tv_sec = 1;
+
+    /* Wait for X Event or a Timer */
+    if(select(x11_fd+1, &in_fds, 0, 0, &tv))
+        goto EVENT_QUEUED;
+
+    return 0;
+
+EVENT_QUEUED:
+        XNextEvent(display, &ev);
+        *retval = ev;
+        return 1;
+}