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<html> <head> <title>memset</title> <META NAME="KEYWORDS" CONTENT="memset"> </head> <body BGCOLOR="#ffffff" LINK="#0000ff" VLINK="#0000ff" ALINK="#0000ff" TEXT="#000000"> <center> <h1><b>memset</b></h1></center> <PRE> <STRONG><A HREF="/man3/MEMSET">MEMSET(3)</A></STRONG> Linux Programmer's Manual <STRONG><A HREF="/man3/MEMSET">MEMSET(3)</A></STRONG> NAME memset - fill memory with a constant byte SYNOPSIS #include <string.h> void *memset(void *s, int c, size_t n); DESCRIPTION The memset() function fills the first n bytes of the memory area pointed to by s with the constant byte c. RETURN VALUE The memset() function returns a pointer to the memory area s. ATTRIBUTES For an explanation of the terms used in this section, see at- <STRONG><A HREF="/man7/tributes">tributes(7)</A></STRONG>. +----------+---------------+---------+ |Interface | Attribute | Value | +----------+---------------+---------+ |memset() | Thread safety | MT-Safe | +----------+---------------+---------+ CONFORMING TO POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD. SEE ALSO <STRONG><A HREF="/man3/bstring">bstring(3)</A></STRONG>, <STRONG><A HREF="/man3/bzero">bzero(3)</A></STRONG>, <STRONG><A HREF="/man3/swab">swab(3)</A></STRONG>, <STRONG><A HREF="/man3/wmemset">wmemset(3)</A></STRONG> COLOPHON This page is part of release 5.05 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU 2017-03-13 <STRONG><A HREF="/man3/MEMSET">MEMSET(3)</A></STRONG></PRE> <center> <h6>Man Pages Copyright Respective Owners. Site Copyright (C) 1994 - 2025 <a href="http://www.he.net">Hurricane Electric</a>. All Rights Reserved.</h6></center> </body> </html>