Check return codes everywhere
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Some checks for return codes are missing.
Examples:
Would you like to add more error handling for return values from "fprintf" like in the function "HelpAndBye" and from "pthread_join" in the function "main"?
http://wifiscanner.svn.sourceforge.net/viewvc/wifiscanner/trunk/daily/src/scanner.c?revision=158&view=markup
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How do you think about to detect every error situation as early as possible by returned error codes?
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Fixed in SVN version.
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Do you care for failed output and log messages?
Can the tool "http://splint.org/" help to find any remaining issues?