explain_ustat_or_die3

Usage

Overview

The explain_ustat_or_die function is used to call the ustat(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_ustat(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

The explain_ustat_on_error function is used to call the ustat(2) system call. On failure an explanation will be printed to stderr, obtained from the explain_ustat(3) function, but still returns to the caller.

Return value

The explain_ustat_or_die function only returns on success, see ustat(2) for more information. On failure, prints an explanation and exits, it does not return.

The explain_ustat_on_error function always returns the value return by the wrapped ustat(2) system call.

Examples

The explain_ustat_or_die function is intended to be used in a fashion similar to the following example:

explain_ustat_or_die(dev, ubuf);