Make exit code indicate a problem when pidfile is not writable. #609
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Here, we try to open the pidfile for writing prior to forking so that the exit code can properly indicate to the user that there was a problem. No error messages are printed to the console in this case because when --daemon implies --syslog. So, the syslog will contain the message indicating that the pidfile wasn't writeable. Fixes bug sshuttle#598.
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Open the pidfile for writing prior to forking so that the exit code can properly indicate to the user that there was a problem. No error messages are printed to the console in this case because when --daemon implies --syslog. So, the syslog will contain the message indicating that the pidfile wasn't writeable.
Fixes bug #598.