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Showing content from https://github.com/AdaCore/spawn below:

GitHub - AdaCore/spawn

This library provides simple API to spawn processes and communicate with them. We provide two implementations of the same API - the integrated into Glib event loop and the independent.

Run alr get --build spawn or alr get --build spawn_glib.

Also you can build from the cloned repository directory with

For spawn_glib do this in packages/glib subdirectory:

cd packages/glib
alr build

Clone repository or unpack source archive, then run

make all install PREFIX=/path/to/install

1. Add with "spawn"; or with "spawn_glib"; to your project file.
2. Create a process object:

   P : Spawn.Processes.Process;

3. Assign program name

   P.Set_Program ("/bin/bash");

4. (Optional) Assign command line arguments, working directory, environments variables.
5. Assign an event listener

   P.Set_Listener (L'Unchecked_Access);

6. Start the process:
7. (Glib independent case) With no event loop integration you should drive it by you-self periodically calling

   Spawn.Processes.Monitor_Loop (1);

The listener will get these events:

• Standard_Output_Available
• Standard_Error_Available
• Standard_Input_Available
• Started
• Finished
• Error_Occurred
• Exception_Occurred

See an example in the spawn test

Next diagram shows process states and emited events during its life:

You should NOT finalize process object until it in Not_Running state.

AdaCore

Feel free to dive in! Open an issue or submit PRs.

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