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22.3.1. foo ... at /dev/null line 0


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and Stas Bekman (StasoSphere).

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Under mod_perl, you may receive a warning or an error in the error_log file that specifies /dev/null as the source file and line 0 as the line number where the printing of the message was triggered. This is quite normal if the code is executed from within a handler, because there is no actual file associated with the handler. Therefore, $0 is set to /dev/null, and that's what you see.

 

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