explain_vfprintf_or_die - formatted output conversion and report errors

       libexplain version 1.4
       Copyright (C) 2010 Peter Miller

                                                                                      explain_vfprintf_or_die(3)

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

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

       fp      The fp, exactly as to be passed to the vfprintf(3) system call.

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

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

       The  explain_vfprintf_or_die  function  is  intended  to  be  used  in a fashion similar to the following
       example:
              explain_vfprintf_or_die(fp, format, ap);

       explain_vfprintf_or_die - formatted output conversion and report errors

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

       The explain_vfprintf_on_error function always returns the value return by the wrapped vfprintf(3)  system
       call.

vfprintf(3)
               formatted output conversion

       explain_vfprintf(3)
               explain vfprintf(3) errors

       exit(2) terminate the calling process

       #include <libexplain/vfprintf.h>
       void explain_vfprintf_or_die(FILE *fp, const char *format, va_list ap);
       int explain_vfprintf_on_error(FILE *fp, const char *format, va_list ap);