---
name: "bzero"
section: "3"
platform: "macos"
package: "Libc"
version: "1752.120.2"
release: "macOS 26.5"
platforms: ["linux", "freebsd", "macos"]
url: "https://new.carta.tech/bzero"
---

# bzero(3)

write zeroes to a byte string

## NAME

**bzero** – write zeroes to a byte string

## LIBRARY

Standard C Library (libc, -lc)

## SYNOPSIS

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

*void*\

**bzero**(*void \*s*, *size\_t n*);

## DESCRIPTION

The **bzero**() function writes *n* zeroed bytes to the string *s*. If *n* is zero, **bzero**() does nothing.

## SEE ALSO

[memset(3)](/memset/3.md), [swab(3)](/swab/3.md)

## HISTORY

A **bzero**() function appeared in 4.3BSD. Its prototype existed previously in ⟨string.h⟩ before it was moved to ⟨strings.h⟩ for IEEE Std 1003.1-2001 (“POSIX.1”) compliance.

**bzero**() was deprecated in IEEE Std 1003.1-2001 (“POSIX.1”) and removed in IEEE Std 1003.1-2008 (“POSIX.1”).