From: 643-408-1753@kylheku.com   
      
   On 2025-11-08, Michael Sanders  wrote:   
   > On Sat, 8 Nov 2025 19:28:20 -0000 (UTC), Lew Pitcher wrote:   
   >   
   >> 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.   
   >   
   > Thanks again Lew. I'm running with: [D]e[F]ault [L]evel in my // comments.   
      
   That is likely apocryphal; since L is present in "default", the   
   simplest hypothesis is that the L in DFL is that one.   
      
   The argument in question is a handler not a level. That has an L,   
   but not in the leading position, making the revised origin hypothesis   
   [D]e[F]ault hand[L]ing is even more farfetched.   
      
      
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