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Process Status Code Helper

Project description

pstatus is can be used to extract meaning from process status codes as returned by os.system, os.wait, os.waitpid, as well as subprocess.call, subprocess.CalledProcessError.returncode, subprocess.Popen.call, subprocess.Popen.wait, and subprocess.Popen.returncode.

It exports a function split which extracts an exit code, a signal number, a flag indicating whether or not the process left a core dump behind.

Also includes a module pstatus.os which exports system, wait, wait3, wait4, and waitpid. Each of these shadow the functions with the same name in the standard library’s os module, but instead of returning a status code, returns a split tuple.

API documentation is available at ReadTheDocs.

pstatus

pstatus.split

With os.system:

>>> split(os.system('true'))
Status(exit=0, signal=None, core=False)
>>> split(os.system('false'))
Status(exit=1, signal=None, core=False)

Using os.spawnlp and os.kill to demonstrate extraction of signals:

>>> pid = os.spawnlp(os.P_NOWAIT, 'sleep', 'sleep', '100')
>>> os.kill(pid, 15)
>>> _, code = os.waitpid(pid, 0)
>>> split(code)
Status(exit=None, signal=15, core=False)

With subprocess.call:

>>> import subprocess
>>> split(subprocess.call(['true']), subprocess=True)
Status(exit=0, signal=None, core=None)
>>> split(subprocess.call(['false']), subprocess=True)
Status(exit=1, signal=None, core=None)

Using subprocess.Popen and subprocess.Popen.kill to extract signals:

>>> p = subprocess.Popen(['sleep', '100'])
>>> p.terminate()
>>> split(p.wait(), subprocess=True)
Status(exit=None, signal=15, core=None)

pstatus.os

pstatus.os.system

Shadows os.system and returns split status information.

>>> system('true')
Status(exit=0, signal=None, core=False)

pstatus.os.wait

Shadows os.wait and returns split status information with a pid.

>>> pid = os.spawnlp(os.P_NOWAIT, 'true', 'true')
>>> wait()
Status(pid=12345, exit=0, signal=None, core=False)

pstatus.os.wait3

Shadows os.wait3 and returns split status information with a pid and rusage.

>>> pid = os.spawnlp(os.P_NOWAIT, 'true', 'true')
>>> wait3(0)
Status(pid=12345, exit=0, signal=None, core=False, rusage=resource.struct_rusage(ru_utime=0.0017259999999999999, ru_stime=0.0018889999999999998, ru_maxrss=499712, ru_ixrss=0, ru_idrss=0, ru_isrss=0, ru_minflt=495, ru_majflt=0, ru_nswap=0, ru_inblock=0, ru_oublock=0, ru_msgsnd=0, ru_msgrcv=0, ru_nsignals=0, ru_nvcsw=0, ru_nivcsw=2))

pstatus.os.wait4

Shadows os.wait4 and returns split status information with a pid and rusage.

>>> pid = os.spawnlp(os.P_NOWAIT, 'true', 'true')
>>> wait4(pid, 0)
Status(pid=12345, exit=0, signal=None, core=False, rusage=resource.struct_rusage(ru_utime=0.0017259999999999999, ru_stime=0.0018889999999999998, ru_maxrss=499712, ru_ixrss=0, ru_idrss=0, ru_isrss=0, ru_minflt=495, ru_majflt=0, ru_nswap=0, ru_inblock=0, ru_oublock=0, ru_msgsnd=0, ru_msgrcv=0, ru_nsignals=0, ru_nvcsw=0, ru_nivcsw=2))

pstatus.os.waitpid

Shadows os.waitpid and returns split status information with a pid.

>>> pid = os.spawnlp(os.P_NOWAIT, 'true', 'true')
>>> waitpid(pid, 0)
Status(pid=12345, exit=0, signal=None, core=False)

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