'\" t
.\" Copyright, The contributors to the Linux man-pages project
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.TH memset 3 2025-05-06 "Linux man-pages 6.14"
.SH NAME
memset \- fill memory with a constant byte
.SH LIBRARY
Standard C library
.RI ( libc ,\~ \-lc )
.SH SYNOPSIS
.nf
.B #include <string.h>
.P
.BI "void *memset(size_t " n ;
.BI "             void " s [ n "], int " c ", size_t " n );
.fi
.SH DESCRIPTION
The
.BR memset ()
function fills the first
.I n
bytes of the
memory area pointed to by
.I s
with the constant byte
.IR c .
.SH RETURN VALUE
The
.BR memset ()
function returns a pointer to the memory area
.IR s .
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbx lb lb
l l l.
Interface	Attribute	Value
T{
.na
.nh
.BR memset ()
T}	Thread safety	MT-Safe
.TE
.SH STANDARDS
C11, POSIX.1-2008.
.SH HISTORY
POSIX.1-2001, C89, SVr4, 4.3BSD.
.SH SEE ALSO
.BR bstring (3),
.BR bzero (3),
.BR swab (3),
.BR wmemset (3)