From 1244c816d7cdfa8a26d1671cab67122a8c5271a7 Mon Sep 17 00:00:00 2001
From: pxinwr <peixing.xin@windriver.com>
Date: Tue, 1 Dec 2020 05:48:33 +0800
Subject: bpo-31904: Support signal module on VxWorks (GH-23391)

---
 Lib/test/test_signal.py                                     | 13 ++++++++++---
 .../next/Library/2020-11-19-16-14-36.bpo-31904.83kf9d.rst   |  1 +
 Modules/signalmodule.c                                      |  4 ++++
 3 files changed, 15 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2020-11-19-16-14-36.bpo-31904.83kf9d.rst

diff --git a/Lib/test/test_signal.py b/Lib/test/test_signal.py
index 5a8ff36..6a43fe7 100644
--- a/Lib/test/test_signal.py
+++ b/Lib/test/test_signal.py
@@ -519,10 +519,14 @@ class WakeupSocketSignalTests(unittest.TestCase):
         else:
             write.setblocking(False)
 
-        # Start with large chunk size to reduce the
-        # number of send needed to fill the buffer.
         written = 0
-        for chunk_size in (2 ** 16, 2 ** 8, 1):
+        if sys.platform == "vxworks":
+            CHUNK_SIZES = (1,)
+        else:
+            # Start with large chunk size to reduce the
+            # number of send needed to fill the buffer.
+            CHUNK_SIZES = (2 ** 16, 2 ** 8, 1)
+        for chunk_size in CHUNK_SIZES:
             chunk = b"x" * chunk_size
             try:
                 while True:
@@ -595,6 +599,7 @@ class WakeupSocketSignalTests(unittest.TestCase):
 
 
 @unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
+@unittest.skipUnless(hasattr(signal, 'siginterrupt'), "needs signal.siginterrupt()")
 class SiginterruptTest(unittest.TestCase):
 
     def readpipe_interrupted(self, interrupt):
@@ -680,6 +685,8 @@ class SiginterruptTest(unittest.TestCase):
 
 
 @unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
+@unittest.skipUnless(hasattr(signal, 'getitimer') and hasattr(signal, 'setitimer'),
+                         "needs signal.getitimer() and signal.setitimer()")
 class ItimerTest(unittest.TestCase):
     def setUp(self):
         self.hndl_called = False
diff --git a/Misc/NEWS.d/next/Library/2020-11-19-16-14-36.bpo-31904.83kf9d.rst b/Misc/NEWS.d/next/Library/2020-11-19-16-14-36.bpo-31904.83kf9d.rst
new file mode 100644
index 0000000..e0ea23a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-11-19-16-14-36.bpo-31904.83kf9d.rst
@@ -0,0 +1 @@
+Support signal module on VxWorks.
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index fcc8f1c..7ac797a 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -120,7 +120,11 @@ static volatile struct {
 #else
 #define INVALID_FD (-1)
 static volatile struct {
+#ifdef __VXWORKS__
+    int fd;
+#else
     sig_atomic_t fd;
+#endif
     int warn_on_full_buffer;
 } wakeup = {.fd = INVALID_FD, .warn_on_full_buffer = 1};
 #endif
-- 
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