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Close Set Language. Since it's possible for a given process to call popen more than once, we dynamically allocate the childpid array the first time popen is called , with room for as many children as there are file descriptors.

Calling pipe and fork and then duplicating the appropriate descriptors for each process is similar to what we did earlier in this chapter. To do this, we go through the childpid array in the child, closing any descriptors that are still open.

What happens if the caller of pclose has established a signal handler for SIGCHLD? The call to waitpid from pclose would return an error of EINTR.

Since the caller is allowed to catch this signal or any other signal that might interrupt the call to waitpid , we simply call waitpid again if it is interrupted by a caught signal.

Note that if the application calls waitpid and obtains the exit status of the child created by popen , we will call waitpid when the application calls pclose , find that the child no longer exists, and return 1 with errno set to ECHILD.

Skip Submit. Submit and view feedback for This product This page. View all page feedback. The calling process can write to the spawned command's standard input using the returned stream.

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These methods I'm referring to are: popen , popen2 , popen3 , and popen4 , all of which are described in the following sections.

The goal of each of these methods is to be able to call other programs from your Python code. The os. This pipe allows the command to send its output to another command.

The output is an open file that can be accessed by other programs. Here the command parameter is what you'll be executing, and its output will be available via an open file.

The argument mode defines whether or not this output file is readable 'r' or writable 'w'. Appending a 'b' to the mode will open the file in binary mode.

Thus, for example "rb" will produce a readable binary file object. In order to retrieve the exit code of the command executed, you must use the close method of the file object.

The bufsize parameter tells popen how much data to buffer, and can assume one of the following values:. This method is available for Unix and Windows platforms, and has been deprecated since Python version 2.

If you're currently using this method and want to switch to the Python 3 version, here is the equivalent subprocess version for Python The code above will ask the operating system to list all files in the current directory.

The output of our method, which is stored in p , is an open file, which is read and printed in the last line of the code. The of this code in the context of my current directory result is as follows:.

This method is very similar to the previous one. The main difference is what the method outputs. In this case it returns two file objects, one for the stdin and another file for the stdout.

This file may not exist in chroot ed environments. I had all kinds of trouble encrypting a message with PGP, but I finanlly got it to work. With safe mode enabled, all words following the initial command string are treated as a single argument.

Thus, echo y echo x becomes echo "y echo x". Seems wrong to read and write with popen, according to the manual. The script produced pgp text, but there was something wrong with the text and I could not decode it.

Here is a nice little script for monitoring your http access log. I noticed that some of the examples above seem to advocate passing unencrypted data to gpg via the pipe shell escape, in the absence of a bi-directional popen on some OSes.

This example is for gpg encryption.

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