diff options
| author | yamt <yamt@NetBSD.org> | 2002-08-10 16:55:18 +0000 |
|---|---|---|
| committer | yamt <yamt@NetBSD.org> | 2002-08-10 16:55:18 +0000 |
| commit | 120c9b325602136ca453e07dd35a3e2fa1297840 (patch) | |
| tree | b4131f45f351696030d708e53b4860446fe7d51f /lib/libc/stdlib | |
| parent | 14e693f16befa91383887d937c7a263cc18447d1 (diff) | |
note that alloca can't report error.
from OpenBSD.
Diffstat (limited to 'lib/libc/stdlib')
| -rw-r--r-- | lib/libc/stdlib/alloca.3 | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/lib/libc/stdlib/alloca.3 b/lib/libc/stdlib/alloca.3 index 93186ca6c39..0d8b8638175 100644 --- a/lib/libc/stdlib/alloca.3 +++ b/lib/libc/stdlib/alloca.3 @@ -1,4 +1,4 @@ -.\" $NetBSD: alloca.3,v 1.9 2002/02/07 07:00:27 ross Exp $ +.\" $NetBSD: alloca.3,v 1.10 2002/08/10 16:55:18 yamt Exp $ .\" .\" Copyright (c) 1980, 1991, 1993 .\" The Regents of the University of California. All rights reserved. @@ -33,7 +33,7 @@ .\" .\" from: @(#)alloca.3 8.1 (Berkeley) 6/4/93 .\" -.Dd June 4, 1993 +.Dd August 11, 2002 .Dt ALLOCA 3 .Os .Sh NAME @@ -72,6 +72,18 @@ The .Fn alloca function is machine dependent; its use is discouraged. +.Pp +The +.Fn alloca +function is slightly unsafe because it cannot ensure that the pointer +returned points to a valid and usable block of memory. +The allocation made may exceed the bounds of the stack, or even go +further into other objects in memory, and +.Fn alloca +cannot determine such an error. +Avoid +.Fn alloca +with large unbounded allocations. .\" .Sh HISTORY .\" The .\" .Fn alloca |
