explain_vprintf_or_die - formatted output conversion and report errors

       libexplain version 1.4
       Copyright (C) 2010 Peter Miller

                                                                                       explain_vprintf_or_die(3)

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

       The  explain_vprintf_on_error  function  is  used  to  call  the  vprintf(3)  system  call. On failure an
       explanation will be printed to stderr, obtained from the explain_vprintf(3) function, but  still  returns
       to the caller.

       format  The format, exactly as to be passed to the vprintf(3) system call.

       ap      The ap, exactly as to be passed to the vprintf(3) system call.

       The explain_vprintf_or_die function is intended to be used in a fashion similar to the following example:
              int result = explain_vprintf_or_die(format, ap);

       explain_vprintf_or_die - formatted output conversion and report errors

       The  explain_vprintf_or_die  function  only  returns  on success, see vprintf(3) for more information. On
       failure, prints an explanation and exits, it does not return.

       The explain_vprintf_on_error function always returns the value return by the  wrapped  vprintf(3)  system
       call.

vprintf(3)
               formatted output conversion

       explain_vprintf(3)
               explain vprintf(3) errors

       exit(2) terminate the calling process

       #include <libexplain/vprintf.h>
       int explain_vprintf_or_die(const char *format, va_list ap);
       int explain_vprintf_on_error(const char *format, va_list ap);