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Philip Withnall authored
Prompted by #3071 , this clarifies that `g_test_trap_subprocess()` uses `g_child_watch_source_new()` internally, so it will not work if any of the preconditions for using that API are not met. In particular, if `SIGCHLD` is ignored, things will break. This documentation is not meant to be an API guarantee which constrains the implementation of `g_test_trap_subprocess()` in future, just a tip to people currently using the API. Signed-off-by: Philip Withnall <philip@tecnocode.co.uk> Helps: #3071
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