explain_ustat_or_die - get file system statistics and report errors

       libexplain version 1.4
       Copyright (C) 2009 Peter Miller

                                                                                         explain_ustat_or_die(3)

       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.

       dev     The dev, exactly as to be passed to the ustat(2) system call.

       ubuf    The ubuf, exactly as to be passed to the ustat(2) system call.

       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);

       explain_ustat_or_die - get file system statistics and report errors

       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.

ustat(2)
               get file system statistics

       explain_ustat(3)
               explain ustat(2) errors

       exit(2) terminate the calling process

       #include <libexplain/ustat.h>
       void explain_ustat_or_die(dev_t dev, struct ustat *ubuf);
       int explain_ustat_on_error(dev_t dev, struct ustat *ubuf);