8a3b22a9_id_____Unix__Linux_System_Call__Description
[Tag] WEXITSTATUS(status) [Description] 
returns the exit status of the child. This consists of the least significant 16-8 bits of the status argument that the child specified in a call to exit() or _exit() or as the argument for a return statement in main(). This macro should only be employed if WIFEXITED returned true.
waitid() - Unix, Linux System Call