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);

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

EXAMPLE

SEE ALSO

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