[Rpm-maint] [rpm-software-management/rpm] Stop blocking when GPG process dies prematurely (RhBug:1746353) (#938)

[Michal Domonkos]

> A SIGCHLD can happen all the time for whatever reason, you need at least to check if the process still exists and retry the Fopen if it does and the error is EINTR.

Could you please elaborate? The thing is, what we're trying to do here is to actually get Fopen unblock when a SIGCHLD happens.

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