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tryflock.c (131B)

      1 #include <sys/types.h>
      2 #include <sys/file.h>
      3 #include <fcntl.h>
      4 
      5 int main(void)
      6 {
      7   return flock(0,LOCK_EX | LOCK_UN | LOCK_NB);
      8 }