[Baptouuuu]

Problem

If a process outputs content to stderr and stdout is flagged as readable but without any content then iterating over $process->output() will hang forever and the process will be blocked by filling up its stderr buffer.

This happens because when fagged readable the process will read its content in a blocking way, however since there's no data it will wait forever for any data to arrive. But there will be no data since the process outputs to stderr only.

The precise reason why stdout is flagged as readable even though there's no data is not understood for now (that's why there's no anti regression test).

Solution

Read stdout/stderr in a non blocking way.

Note

Since the precise reason is not understood, this fix should be treated as an extra caution for something that might happen.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.70%. Comparing base (6b680cd) to head (607792d).

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #30      +/-   ##
============================================
- Coverage     90.74%   90.70%   -0.04%     
  Complexity      605      605              
============================================
  Files            58       58              
  Lines          2324     2325       +1     
============================================
  Hits           2109     2109              
- Misses          215      216       +1     

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