---
name: "ustrerror"
section: "3alleg4"
platform: "linux"
package: "allegro4-doc"
version: "2:4.4.3.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/ustrerror/3alleg4"
---

# ustrerror(3alleg4)

Returns a string describing errno. Allegro game programming library.

## NAME

ustrerror - Returns a string describing errno. Allegro game programming library.

## SYNOPSIS

**#include \<allegro.h\>**

**const char \*ustrerror(int err);**

## DESCRIPTION

This function returns a string that describes the error code \`err', which normally comes from the variable \`errno'. Example:

```
   PACKFILE *input_file = pack_fopen("badname", "r");
   if (input_file == NULL)
      allegro_message("%s\nSorry!\n", ustrerror(errno));
```

## RETURN VALUE

Returns a pointer to a static string that should not be modified or freed. If you make subsequent calls to ustrerror(), the string will be overwritten.

## SEE ALSO

**uconvert**(3alleg4), **allegro\_error**(3alleg4)