1 files changed, 63 insertions, 0 deletions
diff --git a/libs/libevent/docs/make_epoll_table.py b/libs/libevent/docs/make_epoll_table.py
new file mode 100644
index 0000000000..1b15a91a67
--- /dev/null
+++ b/libs/libevent/docs/make_epoll_table.py
@@ -0,0 +1,63 @@
+#!/usr/bin/python2
+
+def get(old,wc,rc,cc):
+    if ('xxx' in (rc, wc, cc)):
+        return "0",255
+
+    if ('add' in (rc, wc, cc)):
+        events = []
+        if rc == 'add' or (rc != 'del' and 'r' in old):
+            events.append("EPOLLIN")
+        if wc == 'add' or (wc != 'del' and 'w' in old):
+            events.append("EPOLLOUT")
+        if cc == 'add' or (cc != 'del' and 'c' in old):
+            events.append("EPOLLRDHUP")
+
+        if old == "0":
+            op = "EPOLL_CTL_ADD"
+        else:
+            op = "EPOLL_CTL_MOD"
+        return "|".join(events), op
+
+    if ('del' in (rc, wc, cc)):
+        delevents = []
+        modevents = []
+        op = "EPOLL_CTL_DEL"
+
+        if 'r' in old:
+            modevents.append("EPOLLIN")
+        if 'w' in old:
+            modevents.append("EPOLLOUT")
+        if 'c' in old:
+            modevents.append("EPOLLRDHUP")
+
+        for item, event in [(rc,"EPOLLIN"),
+                            (wc,"EPOLLOUT"),
+                            (cc,"EPOLLRDHUP")]:
+            if item == 'del':
+                delevents.append(event)
+                if event in modevents:
+                    modevents.remove(event)
+
+        if modevents:
+            return "|".join(modevents), "EPOLL_CTL_MOD"
+        else:
+            return "|".join(delevents), "EPOLL_CTL_DEL"
+
+    return 0, 0
+
+
+def fmt(op, ev, old, wc, rc, cc):
+    entry = "{ %s, %s },"%(op, ev)
+    print "\t/* old=%3s, write:%3s, read:%3s, close:%3s */\n\t%s" % (
+        old, wc, rc, cc, entry)
+    return len(entry)
+
+for old in ('0','r','w','rw','c','cr','cw','crw'):
+    for wc in ('0', 'add', 'del', 'xxx'):
+        for rc in ('0', 'add', 'del', 'xxx'):
+            for cc in ('0', 'add', 'del', 'xxx'):
+
+                op,ev = get(old,wc,rc,cc)
+
+                fmt(op, ev, old, wc, rc, cc)