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 0.52
Copyright (C) 2009 Peter Miller