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"""Examples using create_subprocess_exec() and create_subprocess_shell()."""
import asyncio
import signal
from asyncio.subprocess import PIPE
@asyncio.coroutine
def cat(loop):
proc = yield from asyncio.create_subprocess_shell("cat",
stdin=PIPE,
stdout=PIPE)
print("pid: %s" % proc.pid)
message = "Hello World!"
print("cat write: %r" % message)
stdout, stderr = yield from proc.communicate(message.encode('ascii'))
print("cat read: %r" % stdout.decode('ascii'))
exitcode = yield from proc.wait()
print("(exit code %s)" % exitcode)
@asyncio.coroutine
def ls(loop):
proc = yield from asyncio.create_subprocess_exec("ls",
stdout=PIPE)
while True:
line = yield from proc.stdout.readline()
if not line:
break
print("ls>>", line.decode('ascii').rstrip())
try:
proc.send_signal(signal.SIGINT)
except ProcessLookupError:
pass
@asyncio.coroutine
def test_call(*args, timeout=None):
proc = yield from asyncio.create_subprocess_exec(*args)
try:
exitcode = yield from asyncio.wait_for(proc.wait(), timeout)
print("%s: exit code %s" % (' '.join(args), exitcode))
except asyncio.TimeoutError:
print("timeout! (%.1f sec)" % timeout)
proc.kill()
yield from proc.wait()
loop = asyncio.get_event_loop()
loop.run_until_complete(cat(loop))
loop.run_until_complete(ls(loop))
loop.run_until_complete(test_call("bash", "-c", "sleep 3", timeout=1.0))
loop.close()
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