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