---
name: "function::u64_arg"
section: "3stap"
platform: "linux"
package: "systemtap-doc"
version: "5.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/function::u64_arg"
---

# function::u64\_arg(3stap)

Return function argument as unsigned 64-bit value

## NAME

function::u64\_arg - Return function argument as unsigned 64-bit value

## SYNOPSIS

```
    u64_arg:long(n:long)
```

## ARGUMENTS

*n*

index of argument to return

## DESCRIPTION

Return the unsigned 64-bit value of argument n, same as ulonglong\_arg.

## SEE ALSO0

[*tapset::registers*(3stap)](/tapset::registers/3stap.md)