'\" t
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
.\" SPDX-License-Identifier: Linux-man-pages-copyleft
.\"
.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sat Jul 24 18:49:23 1993 by Rik Faith (faith@cs.unc.edu)
.TH memset 3 2023-07-20 "Linux man-pages 6.05.01"
.SH NAME
memset \- fill memory with a constant byte
.SH LIBRARY
Standard C library
.RI ( libc ", " \-lc )
.SH SYNOPSIS
.nf
.B #include <string.h>
.PP
.BI "void *memset(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
.sp 1
.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)