A setproctitle implementation for Python

Author:	Daniele Varrazzo

The library allows a process to change its title (as displayed by system tools such as ps and top).

Changing the title is mostly useful in multi-process systems, for example when a master process is forked: changing the children's title allows to identify the task each process is busy with. The technique is used by PostgreSQL and the OpenSSH Server for example.

The procedure is hardly portable across different systems. PostgreSQL provides a good multi-platform implementation: this module is a Python wrapper around PostgreSQL code.

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Installation

You can use easy_install to install the module: to perform a system-wide installation use:

sudo easy_install setproctitle

If you are an unprivileged user or you want to limit installation to a local environment, you can use the command:

easy_install -d /target/path setproctitle

Note that easy_install requires /target/path to be in your PYTHONPATH.

Python 3 support

As of version 1.1 the module works with Python 3. In order to install the module, you can use the distribute replacemente for easy_install.

In order to build and test the module under Python 3, the Makefile contains some helper targets.

Usage

The setproctitle module exports the following functions:

setproctitle(title)

Set title as the title for the current process.

getproctitle()

Return the current process title.

Environment variables

A few environment variables can be used to customize the module behavior:

SPT_NOENV

Avoid clobbering /proc/PID/environ.

On many platforms, setting the process title will clobber the environ memory area. os.environ will work as expected from within the Python process, but the content of the file /proc/PID/environ will be overwritten. If you require this file not to be broken you can set the SPT_NOENV environment variable to any non-empty value: in this case the maximum length for the title will be limited to the length of the command line.

SPT_DEBUG

Print debug information on stderr.

If the module doesn't work as expected you can set this variable to a non-empty value to generate information useful for debugging. Note that the most useful information is printed when the module is imported, not when the functions are called.

Module status

The module can be currently compiled and effectively used on the following platforms:

• GNU/Linux
• BSD
• MacOS X
• Windows

Note that on Windows there is no way to change the process string: what the module does is to create a Named Object whose value can be read using a tool such as Process Explorer (contribution of a more useful tool to be used together with setproctitle would be well accepted).

The module can probably work on HP-UX, but I haven't found any to test with. It is unlikely that it can work on Solaris instead.

Other known implementations and discussions

• procname: a module exposing the same functionality, but less portable and not well packaged.
• Issue 5672: where the introduction of such functionality into the stdlib is being discussed.