08-12-2009
Thanks for that explanation zaxxon..
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LEARN ABOUT DEBIAN
explain_ftell_or_die
explain_ftell_or_die(3) Library Functions Manual explain_ftell_or_die(3)
NAME
explain_ftell_or_die - get stream position and report errors
SYNOPSIS
#include <libexplain/ftell.h>
long explain_ftell_or_die(FILE *fp);
long explain_ftell_on_error(FILE *fp);
DESCRIPTION
The explain_ftell_or_die function is used to call the ftell(3) system call. On failure an explanation will be printed to stderr, obtained
from the explain_ftell(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_ftell_on_error function is used to call the ftell(3) system call. On failure an explanation will be printed to stderr, obtained
from the explain_ftell(3) function, but still returns to the caller.
fp The fp, exactly as to be passed to the ftell(3) system call.
RETURN VALUE
The explain_ftell_or_die function only returns on success, see ftell(3) for more information. On failure, prints an explanation and exits,
it does not return.
The explain_ftell_on_error function always returns the value return by the wrapped ftell(3) system call.
EXAMPLE
The explain_ftell_or_die function is intended to be used in a fashion similar to the following example:
long result = explain_ftell_or_die(fp);
SEE ALSO
ftell(3)
get stream position
explain_ftell(3)
explain ftell(3) errors
exit(2) terminate the calling process
COPYRIGHT
libexplain version 0.52
Copyright (C) 2010 Peter Miller
explain_ftell_or_die(3)