NAME

       explain_ustat_or_die - get file system statistics and report errors

SYNOPSIS

       #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);

DESCRIPTION

       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.

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.

EXAMPLE

       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);

SEE ALSO

       ustat(2)
               get file system statistics

       explain_ustat(3)
               explain ustat(2) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 1.4
       Copyright (C) 2009 Peter Miller

                                                                          explain_ustat_or_die(3)