---
name: "explain_ustat_or_die"
section: "3"
platform: "linux"
package: "libexplain-dev"
version: "1.4.D001-16"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/explain_ustat_or_die"
---

# explain\_ustat\_or\_die(3)

get file system statistics and report errors

## 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)](/ustat/2.md) system call. On failure an explanation will be printed to *stderr*, obtained from the [*explain\_ustat*(3)](/explain_ustat/3.md) function, and then the process terminates by calling `exit(EXIT_FAILURE)`.

The **explain\_ustat\_on\_error** function is used to call the [*ustat*(2)](/ustat/2.md) system call. On failure an explanation will be printed to *stderr*, obtained from the [*explain\_ustat*(3)](/explain_ustat/3.md) function, but still returns to the caller.

- *dev*

  The dev, exactly as to be passed to the [*ustat*(2)](/ustat/2.md) system call.

- *ubuf*

  The ubuf, exactly as to be passed to the [*ustat*(2)](/ustat/2.md) system call.

## RETURN VALUE

The **explain\_ustat\_or\_die** function only returns on success, see [*ustat*(2)](/ustat/2.md) 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)](/ustat/2.md) 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)](/ustat/2.md)

  get file system statistics

- [*explain\_ustat*(3)](/explain_ustat/3.md)

  explain [*ustat*(2)](/ustat/2.md) errors

- [*exit*(2)](/exit/2.md)

  terminate the calling process

## COPYRIGHT

libexplain version 1.4\
 Copyright (C) 2009 Peter Miller