add hg and python

1 files changed, 63 insertions, 0 deletions

diff --git a/sys/src/cmd/python/Demo/sockets/udpecho.py b/sys/src/cmd/python/Demo/sockets/udpecho.py
new file mode 100755
index 000000000..5181c8283
--- /dev/null
+++ b/sys/src/cmd/python/Demo/sockets/udpecho.py
@@ -0,0 +1,63 @@
+#! /usr/bin/env python
+
+# Client and server for udp (datagram) echo.
+#
+# Usage: udpecho -s [port]            (to start a server)
+# or:    udpecho -c host [port] <file (client)
+
+import sys
+from socket import *
+
+ECHO_PORT = 50000 + 7
+BUFSIZE = 1024
+
+def main():
+    if len(sys.argv) < 2:
+        usage()
+    if sys.argv[1] == '-s':
+        server()
+    elif sys.argv[1] == '-c':
+        client()
+    else:
+        usage()
+
+def usage():
+    sys.stdout = sys.stderr
+    print 'Usage: udpecho -s [port]            (server)'
+    print 'or:    udpecho -c host [port] <file (client)'
+    sys.exit(2)
+
+def server():
+    if len(sys.argv) > 2:
+        port = eval(sys.argv[2])
+    else:
+        port = ECHO_PORT
+    s = socket(AF_INET, SOCK_DGRAM)
+    s.bind(('', port))
+    print 'udp echo server ready'
+    while 1:
+        data, addr = s.recvfrom(BUFSIZE)
+        print 'server received %r from %r' % (data, addr)
+        s.sendto(data, addr)
+
+def client():
+    if len(sys.argv) < 3:
+        usage()
+    host = sys.argv[2]
+    if len(sys.argv) > 3:
+        port = eval(sys.argv[3])
+    else:
+        port = ECHO_PORT
+    addr = host, port
+    s = socket(AF_INET, SOCK_DGRAM)
+    s.bind(('', 0))
+    print 'udp echo client ready, reading stdin'
+    while 1:
+        line = sys.stdin.readline()
+        if not line:
+            break
+        s.sendto(line, addr)
+        data, fromaddr = s.recvfrom(BUFSIZE)
+        print 'client received %r from %r' % (data, fromaddr)
+
+main()