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Man Pages
explain_ftello_or_die(3) FreeBSD Library Functions Manual explain_ftello_or_die(3)

explain_ftello_or_die - get stream position and report errors

#include <libexplain/ftello.h>
off_t explain_ftello_or_die(FILE *fp);
 
off_t explain_ftello_on_error(FILE *fp);

The explain_ftello_or_die function is used to call the ftello(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_ftello(3) function, and then the process terminates by calling exit(EXIT_FAILURE).
The explain_ftello_on_error function is used to call the ftello(3) system call. On failure an explanation will be printed to stderr, obtained from the explain_ftello(3) function, but still returns to the caller.
fp
The fp, exactly as to be passed to the ftello(3) system call.

The explain_ftello_or_die function only returns on success, see ftello(3) for more information. On failure, prints an explanation and exits, it does not return.
The explain_ftello_on_error function always returns the value return by the wrapped ftello(3) system call.

The explain_ftello_or_die function is intended to be used in a fashion similar to the following example:
off_t result = explain_ftello_or_die(fp);

ftello(3)
get stream position
explain_ftello(3)
explain ftello(3) errors
exit(2)
terminate the calling process

libexplain version 1.3
 
Copyright (C) 2013 Peter Miller

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