Remove SIGIO support for input [v5]

This removes all of the SIGIO handling support used for input
throughout the X server, preparing the way for using threads for input
handling instead.

Places calling OsBlockSIGIO and OsReleaseSIGIO are marked with calls
to stub functions input_lock/input_unlock so that we don't lose this
information.

xfree86 SIGIO support is reworked to use internal versions of
OsBlockSIGIO and OsReleaseSIGIO.

v2: Don't change locking order (Peter Hutterer)
v3: Comment weird && FALSE in xf86Helper.c
    Leave errno save/restore in xf86ReadInput
    Squash with stub adding patch (Peter Hutterer)
v4: Leave UseSIGIO config parameter so that
    existing config files don't break (Peter Hutterer)
v5: Split a couple of independent patch bits out
    of kinput.c (Peter Hutterer)

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

2 files changed, 5 insertions, 5 deletions

diff --git a/mi/mieq.c b/mi/mieq.c
index 01812bdeb..8fbe6c363 100644
--- a/mi/mieq.c
+++ b/mi/mieq.c
@@ -145,10 +145,10 @@ mieqGrowQueue(EventQueuePtr eventQueue, size_t new_nevents)
 
     n_enqueued = mieqNumEnqueued(eventQueue);
 
-    /* We block signals, so an mieqEnqueue triggered by SIGIO does not
+    /* We lock input, so an mieqEnqueue does not
      * write to our queue as we are modifying it.
      */
-    OsBlockSignals();
+    input_lock();
 
     /* First copy the existing events */
     first_hunk = eventQueue->nevents - eventQueue->head;
@@ -181,7 +181,7 @@ mieqGrowQueue(EventQueuePtr eventQueue, size_t new_nevents)
     free(eventQueue->events);
     eventQueue->events = new_events;
 
-    OsReleaseSignals();
+    input_unlock();
     return TRUE;
 }
 
diff --git a/mi/mipointer.c b/mi/mipointer.c
index caa7a9f93..3f6252d2f 100644
--- a/mi/mipointer.c
+++ b/mi/mipointer.c
@@ -750,7 +750,7 @@ miPointerMove(DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y)
                                POINTER_SCREEN | POINTER_ABSOLUTE |
                                POINTER_NORAW, &mask);
 
-    OsBlockSignals();
+    input_lock();
 #ifdef XQUARTZ
     darwinEvents_lock();
 #endif
@@ -759,5 +759,5 @@ miPointerMove(DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y)
 #ifdef XQUARTZ
     darwinEvents_unlock();
 #endif
-    OsReleaseSignals();
+    input_unlock();
 }