---
name: "explain_dup_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_dup_or_die"
---

# explain\_dup\_or\_die(3)

duplicate a file descriptor and report errors

## NAME

explain\_dup\_or\_die - duplicate a file descriptor and report errors

## SYNOPSIS

\#include \<libexplain/dup.h\>

void explain\_dup\_or\_die(int fildes);

## DESCRIPTION

The **explain\_dup\_or\_die** function is used to call the [*dup*(2)](/dup/2.md) system call.  On failure an explanation will be printed to *stderr*, obtained from [*explain\_dup*(3)](/explain_dup/3.md), and then the process terminates by calling `exit(EXIT_FAILURE)`.

This function is intended to be used in a fashion similar to the following example:

```
explain_dup_or_die(fildes);
```

- *fildes*

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

- Returns:

  This function only returns on success. On failure, prints an explanation and exits.

## SEE ALSO

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

  duplicate a file descriptor

- [*explain\_dup*(3)](/explain_dup/3.md)

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

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

  terminate the calling process

## COPYRIGHT

libexplain version 1.4\
 Copyright (C) 2008 Peter Miller