From: Keir Fraser <keir.fraser@citrix.com>
Date: Tue, 18 Mar 2008 11:26:43 +0000 (+0000)
Subject: stubdom: Add support for select() call with NULL arguments.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14247^2~54
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=b1c30105ce1e648b15bbb3b95bdcd152e8b5d1c0;p=xen.git

stubdom: Add support for select() call with NULL arguments.

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
---

diff --git a/extras/mini-os/lib/sys.c b/extras/mini-os/lib/sys.c
index 3e325b10a1..ffc8bf9ff3 100644
--- a/extras/mini-os/lib/sys.c
+++ b/extras/mini-os/lib/sys.c
@@ -837,9 +837,19 @@ int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
     add_waiter(w4, xenbus_watch_queue);
     add_waiter(w5, kbdfront_queue);
 
-    myread = *readfds;
-    mywrite = *writefds;
-    myexcept = *exceptfds;
+    if (readfds)
+        myread = *readfds;
+    else
+        FD_ZERO(&myread);
+    if (writefds)
+        mywrite = *writefds;
+    else
+        FD_ZERO(&mywrite);
+    if (exceptfds)
+        myexcept = *exceptfds;
+    else
+        FD_ZERO(&myexcept);
+
     DEBUG("polling ");
     dump_set(nfds, &myread, &mywrite, &myexcept, timeout);
     DEBUG("\n");
@@ -878,9 +888,19 @@ int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
 	thread->wakeup_time = stop;
     schedule();
 
-    myread = *readfds;
-    mywrite = *writefds;
-    myexcept = *exceptfds;
+    if (readfds)
+        myread = *readfds;
+    else
+        FD_ZERO(&myread);
+    if (writefds)
+        mywrite = *writefds;
+    else
+        FD_ZERO(&mywrite);
+    if (exceptfds)
+        myexcept = *exceptfds;
+    else
+        FD_ZERO(&myexcept);
+
     n = select_poll(nfds, &myread, &mywrite, &myexcept);
 
     if (n) {