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Your program should at least exit(3) EXIT_SUCCESS (i.e. 0) on success and probably EXIT_FAILURE (i.e. 1) on failure. You could copy (or be inspired by) FreeBSD sysexits.h for more failure codes (but I am not sure it is worth the effort). Don't forget to give some message to stderr (or thru syslog(3)) for any kind of failure. From what you describes, failing ...

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