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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. whitequark‏ @whitequark 26 Nov 2017

      I have just discovered that *nix systems have two completely unrelated APIs called "flock" and "lockf" and words cannot describe the rage that is boiling within me

      13 replies 38 retweets 174 likes
      Show this thread
    2. Tiffany Bennett‏ @Tiffnixen 26 Nov 2017
      Replying to @whitequark

      Isn't there also a third way, and all three are broken in unique ways? And there's no good way to actually lock files as a result?

      2 replies 1 retweet 6 likes
    3.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 26 Nov 2017
      Replying to @Tiffnixen @whitequark

      flock sometimes does and sometimes doesn't work over nfs when it does, it interoperates with fcntl locks on the NFS server but not flock locks lockf wraps fcntl locks fcntl locks all unlock themself if you close *any* fd pointing to a given file

      2 replies 4 retweets 12 likes
    4.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 26 Nov 2017
      Replying to @erincandescent @whitequark

      yes really a = open("foo", ...); b = open("foo", ...); lockf(a, F_LOCK, 0); // file is now locked close(b); // file is now unlocked

      1 reply 4 retweets 7 likes
    5.  🎃 unsafe { mem::transmute(@erincandescent) }  🎃‏ @erincandescent 26 Nov 2017
      Replying to @erincandescent @whitequark

      have you ever seen the bit of the sqlite3 documentation where it says you must never open an sqlite database file using open(2)/fopen(3) while its open with sqlite in the same process or *database corruption may occur*? yeah, this is why

      4 replies 11 retweets 15 likes
      Rich Felker‏ @RichFelker 26 Nov 2017
      Replying to @erincandescent @whitequark

      This is why you use the new POSIX-future OFD locks instead of the old ones.

      1:44 PM - 26 Nov 2017
      • 4 Likes
      • McCloud Paul Jakma (\/) ( ͡°,,,°) (\/) Finite Nate Machine
      1 reply 0 retweets 4 likes
        1. New conversation
        2. Charles Forsyth‏ @charles_forsyth 26 Nov 2017
          Replying to @RichFelker @erincandescent @whitequark

          The different locking mechanisms came from different variants, and none was very good. I wrote a short report about them years ago, which I can't now find, but I suspect it concluded "they do too little and too much", rather like "volatile".

          1 reply 0 retweets 0 likes
        3. Charles Forsyth‏ @charles_forsyth 26 Nov 2017
          Replying to @charles_forsyth @RichFelker and

          AT&T had fcntl/F_*LCK, flock was BSD, lockf was originally UG something (Unix Group?), locking() was Xenix, probably others. They were all troublesome: eg, limit on number of record locks was common, since in kernel, and could be small (100?).

          1 reply 0 retweets 0 likes
        4. Charles Forsyth‏ @charles_forsyth 26 Nov 2017
          Replying to @charles_forsyth @RichFelker and

          Similar proliferation of variants with IPC, so you couldn't solve the problem by introducing your own monitor. System V IPC is still there. Why? Put it out of our misery.

          0 replies 0 retweets 0 likes
        5. End of conversation

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