The docs for the subprocess.Popen() say:
Use communicate() rather than .stdin.write, .stdout.read
or .stderr.read to avoid deadlocks due to any of the other
OS pipe buffers filling up and blocking the child process
But if I want to send a string to stdin, how can I do that without
stdin.write()?
This seems to work:
import subprocess as s
thing = """
hey
there
foo man is here
hey foo
man is there
so foo
"""
p = s.Popen(['grep', 'foo'], stdin = s.PIPE, stdout = s.PIPE)
p.stdin.write(thing)
print p.communicate()
######################
('\they foo\n \tfoo there\n', None)
Will this always avoid the deadlock problem?
This also works:
p = s.Popen(['grep', 'foo'], stdin = s.PIPE, stdout = s.PIPE)
p.stdin.write(thing)
p.stdin.close()
print p.stdout.read()
Is that vulnerable to deadlock? Is there a better way
to write to and read from the same process?
Thanks!
Tobiah
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