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   comp.lang.c      Meh, in C you gotta define EVERYTHING      243,242 messages   

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   Message 241,854 of 243,242   
   Lew Pitcher to Michael Sanders   
   Re: SIG_DFL   
   08 Nov 25 19:28:20   
   
   From: lew.pitcher@digitalfreehold.ca   
      
   On Sat, 08 Nov 2025 19:01:00 +0000, Michael Sanders wrote:   
      
   > One of many newbie questions from me... Cant find the info I'm looking for.   
   >   
   > If SIG_IGN is an acronym for signal ignore, then what does DFL mean?   
   > I've know (well I presume) it restores default behavior, but the acronym?   
      
   From the C11 draft standard (yes, I know, but that's the most current I have)   
      
   7.14.1.1 The signal function   
            2. ... If the value of func is SIG_DFL, default handling for that   
               signal will occur.   
      
   Neither the C standard, nor the Posix standards or Unix manuals before that,   
   seem to specify exactly _why_ SIG_DFL is named that way. Presumably because   
   other abbreviations would somehow conflict or possibly be confused with   
   existing nomenclature (SIGUSR1 and SIGUSR2, for instance, are user-DEFined   
   signals, and SIG_DEF might confuse someone who isn't entirely familiar with   
   the nomenclature), or because (like many abbreviations in Unix, "DeFauLt"   
   made more sense to someone.   
      
   --   
   Lew Pitcher   
   "In Skills We Trust"   
   Not LLM output - I'm just like this.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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