Fix error handling of fork() calls. #459
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When failing to start a sub-process (out-of-memory can be reported when calling the fork() system call), properly handle the error rather than continue trying the migration. In order to cancel the other sub-processes that were succesfully started we then send a TERM signal to all processes in our process group.
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When failing to start a sub-process (out-of-memory can be reported when calling the fork() system call), properly handle the error rather than continue trying the migration.
In order to cancel the other sub-processes that were succesfully started we then send a TERM signal to all processes in our process group.
Fixes #458