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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Sam Tobin-Hochstadt‏ @samth Jan 18
      Replying to @RichFelker @johnregehr

      The programmer is making an assumption about the whole system, which is a fine one if you don't care about the behavior of the program when that assumption is false.

      1 reply 0 retweets 0 likes
    2. Rich Felker‏ @RichFelker Jan 18
      Replying to @samth @johnregehr

      You're free to disagree, but in teaching the language and its idioms, this should be explained as erroneous use. assert documents something that supposedly can't happen; it doesn't test for unwanted runtime conditions.

      2 replies 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker Jan 18
      Replying to @RichFelker @samth @johnregehr

      If adding -DNDEBUG would make the program misbehave under certain conditions, you're misusing assert().

      1 reply 0 retweets 0 likes
    4. John Regehr‏ @johnregehr Jan 18
      Replying to @RichFelker @samth

      not sure I like this as an operational definition, since a buggy program + -DNDEBUG will indeed misbehave, instead of crashing cleanly

      2 replies 0 retweets 1 like
    5. Rich Felker‏ @RichFelker Jan 18
      Replying to @johnregehr @samth

      Indeed, it should be understood in a context of intent and a (probably false) assumption that the program is not buggy.

      1 reply 0 retweets 2 likes
    6. John Regehr‏ @johnregehr Jan 18
      Replying to @RichFelker @samth

      now I'm happy with your definition again! but I'm also generally OK with a minor abuse such as the one Sam is suggesting, which is really a shorthand for something pretty complicated about the whole system...

      1 reply 0 retweets 0 likes
    7. Sam Tobin-Hochstadt‏ @samth Jan 18
      Replying to @johnregehr @RichFelker

      Similarly, asserting that input reads as a positive integer is fine if it's a claim that the intended scope of invariants includes the user (fine in a script for just my use, bad in a public website).

      1 reply 0 retweets 0 likes
    8. Brian Mastenbrook‏ @bmastenbrook Jan 18
      Replying to @samth @johnregehr @RichFelker

      in the C context, I'm not sure that's fine if the assert is the only thing standing between the input and UB-induced launch-the-missiles. "error and abort if this is wrong" is very different than something that disappears under -DNDEBUG

      1 reply 0 retweets 1 like
    9. John Regehr‏ @johnregehr Jan 18
      Replying to @bmastenbrook @samth @RichFelker

      in extremely informal settings I'm fine with this usage of assert(), which requires that -DNDEBUG is never used, but never if the code might be reused somewhere else.

      3 replies 0 retweets 0 likes
    10. Brian Mastenbrook‏ @bmastenbrook Jan 18
      Replying to @johnregehr @samth @RichFelker

      I feel like I don't want to pollute my thinking about asserts by using it that way, even informally. I do a lot of if (condition) { printf("idiot\n"); abort(); } in my own stupid test programs instead

      1 reply 0 retweets 2 likes
      Rich Felker‏ @RichFelker Jan 18
      Replying to @bmastenbrook @johnregehr @samth

      You can just make a function fatal() to do the same, or an assert-like macro fatal_if()...

      3:38 PM - 18 Jan 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. John Regehr‏ @johnregehr Jan 18
          Replying to @RichFelker @bmastenbrook @samth

          yep I have many goals such as writing good commit messages, moving away from perl, using good assert discipline, exercising every day, ...

          2 replies 0 retweets 2 likes
        3. John Regehr‏ @johnregehr Jan 18
          Replying to @johnregehr @RichFelker and

          I do not expect to achieve all of these goals, ever

          0 replies 0 retweets 0 likes
        4. End of conversation

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