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appendmode if the file is not yet open. The log file is determined from the setting
http:logfile. If this setting is set to the empty atom (''), this predicate fails.
If a file error is encountered, this is reported using print_message/2, after which this predicate silently fails. Opening is retried every minute when a new message arrives.
Before opening the log file, the message
broadcasted. This message allows for creating the directory,
renaming, deleting or truncating an existing log file.