Clarify that memset_s(3) requires __STDC_WANT_LIB_EXT1__ for visibility.
Fix typos and other nits. Submitted by: Yuri Pankov <yuripv@yuripv.net> MFC after: 3 days Differential revision: https://reviews.freebsd.org/D16797
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=338049
@ -32,7 +32,7 @@
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.\" @(#)memset.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd February 15, 2018
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.Dd August 19, 2018
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.Dt MEMSET 3
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.Os
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.Sh NAME
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@ -44,6 +44,7 @@
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.In string.h
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.Ft void *
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.Fn memset "void *dest" "int c" "size_t len"
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.Fd #define __STDC_WANT_LIB_EXT1__ 1
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.Ft errno_t
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.Fn memset_s "void *dest" "rsize_t destsz" "int c" "rsize_t len"
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.Sh DESCRIPTION
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@ -82,7 +83,6 @@ or
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is greater than
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.Dv RSIZE_MAX ,
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or
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.Sp
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.Fa len
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is greater than
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.Fa destsz
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@ -93,10 +93,10 @@ Like
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.Xr explicit_bzero 3 ,
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.Fn memset_s
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is not removed through Dead Store Elimination (DSE), making it useful for
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clearing sensitve data.
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clearing sensitive data.
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In contrast
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.Fn memset
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function
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function
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may be optimized away if the object modified by the function is not accessed
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again.
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To clear memory that will not subsequently be accessed it is advised to use
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@ -126,6 +126,6 @@ function
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conforms to
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.St -isoC .
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.Fn memset_s
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conforms to:
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conforms to
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.St -isoC-2011
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K.3.7.4.1.
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