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POpexpect can't pass input over 1024 chars?
 

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    <p>I'm currently passing some input to a process with pexpect with the following code:</p> <pre><code>p = pexpect.spawn('cat', timeout=5.0 ) p.maxread = 5000 p.setecho(False) # prevent the process from echoing stdin back to us INPUT_LEN = 1024 p.sendline('a'*INPUT_LEN) print p.readline() # pexpect.TIMEOUT: Timeout exceeded in read_nonblocking(). </code></pre> <p>When INPUT_LEN &lt; 1024, everything works fine, but <strong>for >= 1024 characters, the process does not receive the full input</strong>, causing raising a "pexpect.TIMEOUT" error on p.readline().</p> <p>I've tried splitting my input into pieces smaller than 1024 characters, but this has the same issue:</p> <pre><code>p = pexpect.spawn('cat', timeout=5.0 ) p.maxread = 5000 p.setecho(False) INPUT_LEN = 1024 p.send('a'*1000) p.sendline('a'*(INPUT_LEN-1000)) print p.readline() # pexpect.TIMEOUT: Timeout exceeded in read_nonblocking(). </code></pre> <p>Does anyone know how to make pexpect work with inputs over 1024 characters? I tried looking at the source, but it just seems to be calling os.write(...).</p> <p>(As a side note, I've noticed the same truncation error occurs when I run "cat" from a shell and attempt to paste in >=1024 characters with "Cmd+V". However, everything works fine if I run "pbpaste | cat" .)</p> <p>Thanks!</p> <p><strong>Update:</strong> The call to "os.write()" returns 1025, indicating a successful write, but os.read() returns "\x07" (the single character BEL), and then hangs on the next call, resulting in the timeout.</p> <p>Dividing the os.write() call into two sub-1024 byte write()s, separated by a call to os.fsync(), does not change anything.</p>
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    1. CO`pexpect.spawn` should have a `maxdata` keyword by default set to `2000`, so probably this wont apply to your case, but have you tried increasing it?
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      1. USRik Poggi
    2. COUnfortunately that didn't work; see latest edit
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    3. COSorry for the confusion, I wrote maxdata but I meant `maxread`, well it was worth a try I guess.
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