|explain_ftello_or_die(3)||Library Functions Manual||explain_ftello_or_die(3)|
NAME¶explain_ftello_or_die - get stream position and report errors
off_t explain_ftello_or_die(FILE *fp);
off_t explain_ftello_on_error(FILE *fp);
DESCRIPTION¶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.
- The fp, exactly as to be passed to the ftello(3) system call.
RETURN VALUE¶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.
EXAMPLE¶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);
COPYRIGHT¶libexplain version 1.4
Copyright (C) 2013 Peter Miller