explain_wait4_or_die - wait for process to change state and report errors

       libexplain version 1.4
       Copyright (C) 2008 Peter Miller

                                                                                         explain_wait4_or_die(3)

       The  explain_wait4_or_die  function  is used to call the wait4(2) system call.  On failure an explanation
       will be printed to stderr, obtained from explain_wait4(3), and then the  process  terminates  by  calling
       exit(EXIT_FAILURE).

       This function is intended to be used in a fashion similar to the following example:
              explain_wait4_or_die(pid, status, options, rusage);

       pid     The pid, exactly as to be passed to the wait4(2) system call.

       status  The status, exactly as to be passed to the wait4(2) system call.

       options The options, exactly as to be passed to the wait4(2) system call.

       rusage  The rusage, exactly as to be passed to the wait4(2) system call.

       Returns:
               This  function only returns on success, see wait4(2) for more information.  On failure, prints an
               explanation and exits.

       explain_wait4_or_die - wait for process to change state and report errors

wait4(2)
               wait for process to change state

       explain_wait4(3)
               explain wait4(2) errors

       exit(2) terminate the calling process

       #include <libexplain/wait4.h>
       void explain_wait4_or_die(int pid, int *status, int options, struct rusage *rusage);