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(python2.1-lib.info)Popen3 and Popen4 Objects

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Popen3 and Popen4 Objects
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Instances of the `Popen3' and `Popen4' classes have the following
methods:

`poll()'
     Returns `-1' if child process hasn't completed yet, or its return
     code otherwise.

`wait()'
     Waits for and returns the status code of the child process.  The
     status code encodes both the return code of the process and
     information about whether it exited using the `exit()' system call
     or died due to a signal.  Functions to help interpret the status
     code are defined in the `os' module; see section Note: Process
     Management for the `W*()' family of functions.

The following attributes are also available:

`fromchild'
     A file object that provides output from the child process.  For
     `Popen4' instances, this will provide both the standard output and
     standard error streams.

`tochild'
     A file object that provides input to the child process.

`childerr'
     Where the standard error from the child process goes is
     CAPTURESTDERR was true for the constructor, or `None'.  This will
     always be `None' for `Popen4' instances.

`pid'
     The process ID of the child process.


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