OSProcess is contributed under the terms of Squeak-L. Please copy freely.

OSProcess provides access to the external operating system from Squeak.
A plugin is provided for Unix (and Linux) systems. Placeholder classes
are provided in the OSProcess hierarchy for other operating systems
(Windows, Mac, OS/2), but support for these systems is not yet implemented.

Changes in 1.4 since 1.3:
 - Split UnixOSProcessAccessor into two classes. UnixOSProcessPlugin now
   contains the methods which can be translated to a C plugin library,
   and UnixOSProcessAccessor no longer contains the plugin code. Cleaned
   up some of the plugin code to minimize C compiler warnings for strict
   compilers.
 - Added various improvements to child process handling, particularly across
   image restarts. Added a primitive to UnixOSProcessPlugin to allow Squeak
   to check if a child process still exists following an image restart.
   ExternalOSProcess proxies now do a better job of keeping track of the
   external OS processes which they represent.
 - Added UnixProcess class>>makeVM utility for rebuilding the VM from a
   running Squeak session.

You can:
 - Open a inspector on the operating system process in which
   Squeak is running (OSProcess thisOSProcess).
 - Read or write on the stdin, stdout, and stderr streams.
 - Access the command line, and get or set environment variables.
 - Fork and exec external programs, with control of the command
   line, environment, and stdin/stdout/stderr.
 - Open an inspector on a child operating system process created
   from Squeak, with run state and exit status of the child updated
   asynchronously.
 - Run an external command (UnixProcess command: 'xeyes')
 - Create pipes and connect them to external processes.
 - Fork an exact clone of the current running Squeak image (no
   image file) with parent and child Squeak processes proceeding
   from the same point in memory (UnixProcess forkSqueak).
 - Fork a Squeak using the disk based image (UnixProcess squeak).
 - Start a headless Squeak from the running Squeak image, giving
   it an expression to evaluate:
   (UnixProcess forkHeadlessSqueakAndDoThenQuit:
       [UnixProcess command: 'echo hello world'])
 - Tell the running image to go headless (UnixProcess decapitate).
 - Restart the VM on the fly (UnixProcess restartVirtualMachine).
 - Rebuild the VM, and restart Squeak with the new VM if the
   build was successful (UnixProcess makeVM).
 - Start your Swiki in a headless background process
   (UnixProcess>>startSwiki: 'myswiki' onPort: 8081 loggingTo: 'log.txt')

The classes in OSProcess are:

  OSProcess 
    ExternalOSProcess 
      ExternalUnixProcess 
        ConnectedUnixProcess 
    ThisOSProcess 
      MacProcess 
      OS2Process 
      UnixProcess 
      WindowsProcess
  OSProcessAccessor
    MacOSProcessAccessor
    OS2OSProcessAccessor 
    UnixOSProcessAccessor
    WindowsOSProcessAccessor
  AttachableFileStream
  OSPipe
  ShellProxy
  ShellWindow
  UnixOSProcessPlugin

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