waitpid()

wait, but we wait for a specific child.

pid_t waitpid(pid_t pid, int *status, int options);

• Process waits until given child has terminated
  • if pid is -1, waits for any child
• Status have the exit status of the child written to it
• Options explains how to wait
  • If option is 0, waitpid blocks like wait()
  • If option is WNOHANG, it immediately returns 0 instead of blocking if there is no existing terminated child
• Returns process of waited child on success, -1 on failure