explain_openat_or_die - open a file relative to a dir fd and report errors

       libexplain version 1.4
       Copyright (C) 2013 Peter Miller

                                                                                        explain_openat_or_die(3)

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

       The explain_openat_on_error function is used to call the openat(2) system call. On failure an explanation
       will be printed to stderr, obtained from the explain_openat(3) function, but still returns to the caller.

       fildes  The fildes, exactly as to be passed to the openat(2) system call.

       pathname
               The pathname, exactly as to be passed to the openat(2) system call.

       flags   The flags, exactly as to be passed to the openat(2) system call.

       mode    The mode, exactly as to be passed to the openat(2) system call.

       The explain_openat_or_die function is intended to be used in a fashion similar to the following example:
              int result = explain_openat_or_die(fildes, pathname, flags, mode);

       explain_openat_or_die - open a file relative to a dir fd and report errors

       The  explain_openat_or_die  function  only  returns  on  success,  see openat(2) for more information. On
       failure, prints an explanation and exits, it does not return.

       The explain_openat_on_error function always returns the value return  by  the  wrapped  openat(2)  system
       call.

openat(2)
               open a file relative to a directory file descriptor

       explain_openat(3)
               explain openat(2) errors

       exit(2) terminate the calling process

       #include <libexplain/openat.h>
       int explain_openat_or_die(int fildes, const char *pathname, int flags, mode_t mode);
       int explain_openat_on_error(int fildes, const char *pathname, int flags, mode_t mode);