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Recommendation on validating the return value of setsid() along with error messages

Our team works on log enhancement by learning from historical log revisions in evolution.

By mining historical patches, we find two log revisions that added validation about the return value of setsid() along with log messages.

Recommendation for updating msg_panic() to msg_warn() in certain circumstances

Our team researches on consistent update of Postfix during evolution. And we have figured out several spots that may be missed. 

By mining historical patches, we suggest that msg_panic() should be updated to msg_warn()for the logging statement which is under the control dependence where return value of dict_handle()is 0.

Recommendation for insert variable in given logging statement under certain circumstances.

Our team researches on consistent update of Postfix during evolution.

Recommendation for remove check statement and inner logging statement under certain circumstances.

Our team researches on consistent update of Postfix during evolution.