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using filedescriptors in SIGINT signal handler

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Hello,

I catch SIGINT signals with a handler.
In the handler, I use fd's to write some data to a child process.

Is this valid?
Because the data never arrives, and I wonder what I'm doing wrong.

Can filedescriptors still be used when you're in the signal
handling of SIGINT?

Thanks,

   Bram

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