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  • Committer: Martin Pool
  • Date: 2007-04-04 06:17:31 UTC
  • mto: This revision was merged to the branch mainline in revision 2397.
  • Revision ID: mbp@sourcefrog.net-20070404061731-tt2xrzllqhbodn83
Contents of TODO file moved into bug tracker

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bzrlib/strace.py
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"""Support for running strace against the current process."""
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import errno
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import os
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import signal
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import subprocess
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    :return: a tuple: function-result, a StraceResult.
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    """
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    return strace_detailed(function, args, kwargs)
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def strace_detailed(function, args, kwargs, follow_children=True):
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    # FIXME: strace is buggy
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    # (https://bugs.launchpad.net/ubuntu/+source/strace/+bug/103133) and the
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    # test suite hangs if the '-f' is given to strace *and* more than one
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    # thread is running. Using follow_children=False allows the test suite to
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    # disable fork following to work around the bug.
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    # capture strace output to a file
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    log_file = tempfile.NamedTemporaryFile()
 
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    log_file = tempfile.TemporaryFile()
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    log_file_fd = log_file.fileno()
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    pid = os.getpid()
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    # start strace
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    strace_cmd = ['strace', '-r', '-tt', '-p', str(pid), '-o', log_file.name]
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    if follow_children:
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        strace_args.append('-f')
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    proc = subprocess.Popen(strace_cmd,
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                            stdout=subprocess.PIPE,
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                            stderr=subprocess.STDOUT)
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    # Wait for strace to attach
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    attached_notice = proc.stdout.readline()
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    # Run the function to strace
 
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    proc = subprocess.Popen(['strace',
 
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        '-f', '-r', '-tt', '-p', str(pid),
 
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        ],
 
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        stderr=log_file_fd,
 
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        stdout=log_file_fd)
 
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    # TODO? confirm its started (test suite should be sufficient)
 
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    # (can loop on proc.pid, but that may not indicate started and attached.)
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    result = function(*args, **kwargs)
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    # stop strace
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    os.kill(proc.pid, signal.SIGQUIT)