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Segfault Exit Code

Question Text​

What is the exit code of the faulty child process spawned by support/sum-array-bugs/seg-fault/sum_array_processes.d with more than 2 processes?

Question Answers​

  • 11 because this is the code of the SIGSEGV signal

  • 11 because this code is always returned when a process ends with an error

  • 11 because this is the value of the least significant 4 bytes of the partial array sum calculated by the process

  • 6 because the child process was aborted

Feedback​

We can obtain the number of the signal that killed a child process via the second argument of the waitpid syscall. We can use the WIFSIGNALED() and WTERMSIG() macros. By doing so, we see the exit code of the faulty child process is 11. We can then use the kill -l command to view the code of each signal and SIGSEGV has the code 11.