debian man page for explain_fileno_or_die

explain_fileno_or_die(3)				     Library Functions Manual					  explain_fileno_or_die(3)

NAME
       explain_fileno_or_die - check and reset stream status and report errors

SYNOPSIS
       #include <libexplain/fileno.h>
       int explain_fileno_or_die(FILE *fp);
       int explain_fileno_on_error(FILE *fp);

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

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

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

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

       The explain_fileno_on_error function always returns the value return by the wrapped fileno(3) system call.

EXAMPLE
       The explain_fileno_or_die function is intended to be used in a fashion similar to the following example:
	      explain_fileno_or_die(fp);

SEE ALSO
       fileno(3)
	       check and reset stream status

       explain_fileno(3)
	       explain fileno(3) errors

       exit(2) terminate the calling process

COPYRIGHT
       libexplain version 0.52
       Copyright (C) 2009 Peter Miller

															  explain_fileno_or_die(3)