|File: [cvs.NetBSD.org] / src / lib / libc / ssp / __builtin_object_size.3 (download)
Revision 1.1, Wed May 30 01:17:31 2007 UTC (13 years, 9 months ago) by tls
CVS Tags: yamt-pf42-baseX, yamt-pf42-base, matt-mips64-base, matt-mips64, matt-armv6-prevmlocking, matt-armv6-nbase, matt-armv6-base, matt-armv6, keiichi-mipv6-base, keiichi-mipv6, hpcarm-cleanup-base, hpcarm-cleanup, cube-autoconf-base, cube-autoconf
Branch point for: yamt-pf42, wrstuden-fixsa, netbsd-4
Move FORTIFY_SOURCE implementation from the somewhat ill-named "libssp"
(what other systems keep in libssp, we already have in libc) into libc
to match what other systems with FORTIFY_SOURCE do. Goodbye, libssp
dependency in libraries and executables. Discussed with christos and
mrg; Christos will merge the headers to get us the rest of the way to a
FORTIFY_SOURCE implementation that works as others' code expects.
.\" $NetBSD: __builtin_object_size.3,v 1.1 2007/05/30 01:17:31 tls Exp $
.\" Copyright (c) 2007 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Christos Zoulas.
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" This product includes software developed by the NetBSD
.\" Foundation, Inc. and its contributors.
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.Dd May 23, 2007
.Dt __BUILTIN_OBJEXT_SIZE 3
.Nd return the size of the given object
.Fn __builtin_object_size "void *ptr" "int type"
function is a
.Xr gcc 1
built-in function that returns the size of the
object if known at compile time and the object does not have any side
.Sh RETURN VALUES
If the size of the object is not known or it has side effects the
.Bl -tag -width (size_t)-1
.It Dv (size_t)-1
.Dv 1 .
.It Dv (size_t)0
.Dv 3 .
If the size of the object is known, then the
function returns the maximum size of all the objects that the compiler
knows that they can be pointed to by
.Dv & 2 == 0 ,
and the minimum size when
.Dv & 2 != 0 .
.Sh SEE ALSO
.Xr gcc 1 ,
.Xr ssp 3 .
appeared in gcc 4.1.