Specjalistyczne rozwiązania informatyczne

Waitpid causes ENOTBLK error

I had a problem with waitpid. I forked process to execute external application and checked it's result with waitpid:

  execl("/sbin/hwclock", "hwclock", "--systohc", 0);

Combination above always returned errno = ENOTBLK I didn't find any interesting information about this errno and tracked my source code for relation with forking and getting results from children. I forgot about another waitpid - in SIGCLD signal handler. It removed process zombie and secondary waitpid was executed for non-existent process. That's all.

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