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#!/usr/bin/env python3
"""Example showing how to attach a write pipe to a subprocess."""
import asyncio
import os, sys
from asyncio import subprocess
code = """
import os, sys
fd = int(sys.argv[1])
data = os.read(fd, 1024)
sys.stdout.buffer.write(data)
"""
loop = asyncio.get_event_loop()
@asyncio.coroutine
def task():
rfd, wfd = os.pipe()
args = [sys.executable, '-c', code, str(rfd)]
proc = yield from asyncio.create_subprocess_exec(
*args,
pass_fds={rfd},
stdout=subprocess.PIPE)
pipe = open(wfd, 'wb', 0)
transport, _ = yield from loop.connect_write_pipe(asyncio.Protocol,
pipe)
transport.write(b'data')
stdout, stderr = yield from proc.communicate()
print("stdout = %r" % stdout.decode())
pipe.close()
loop.run_until_complete(task())
loop.close()
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