Date: Wed, 27 Jan 2010 16:42:56 +0100 From: Gary Jennejohn <gary.jennejohn@freenet.de> To: Brandon Falk <falkman@gamozo.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Leaks in libc? Message-ID: <20100127164256.2a06177a@ernst.jennejohn.org> In-Reply-To: <4B604B43.7010203@gamozo.org> References: <4B604B43.7010203@gamozo.org>
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On Wed, 27 Jan 2010 08:18:43 -0600
Brandon Falk <falkman@gamozo.org> wrote:
> The simple program:
>=20
> #include <stdlib.h>
> #include <stdio.h>
>=20
> int main()
> {
> puts("Apple cider");
> return 0;
> }
>=20
> Yields the following result in valgrind:
>=20
> =3D=3D4703=3D=3D Memcheck, a memory error detector
> =3D=3D4703=3D=3D Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward=
et al.
> =3D=3D4703=3D=3D Using Valgrind-3.5.0 and LibVEX; rerun with -h for copyr=
ight info
> =3D=3D4703=3D=3D Command: ./a.out
> =3D=3D4703=3D=3D
> Apple cider
> =3D=3D4703=3D=3D
> =3D=3D4703=3D=3D HEAP SUMMARY:
> =3D=3D4703=3D=3D in use at exit: 4,096 bytes in 1 blocks
> =3D=3D4703=3D=3D total heap usage: 1 allocs, 0 frees, 4,096 bytes alloc=
ated
> =3D=3D4703=3D=3D
> =3D=3D4703=3D=3D LEAK SUMMARY:
> =3D=3D4703=3D=3D definitely lost: 0 bytes in 0 blocks
> =3D=3D4703=3D=3D indirectly lost: 0 bytes in 0 blocks
> =3D=3D4703=3D=3D possibly lost: 0 bytes in 0 blocks
> =3D=3D4703=3D=3D still reachable: 0 bytes in 0 blocks
> =3D=3D4703=3D=3D suppressed: 4,096 bytes in 1 blocks
> =3D=3D4703=3D=3D
> =3D=3D4703=3D=3D For counts of detected and suppressed errors, rerun with=
: -v
> =3D=3D4703=3D=3D ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 f=
rom 0)
>=20
> Any ideas why the standard libraries are leaking like this? Is it=20
> perhaps a bug with valgrind, or maybe FreeBSD automatically cleans up so=
=20
> they took the cleanup out of their libc?
>=20
> FreeBSD 8.0 x86_64
>=20
=46rom the valgrind FAQ
"suppressed" means that a leak error has been suppressed. There are some
suppressions in the default suppression files. You can ignore suppressed
errors.
AFAIK all variants of U*X recover memory used by applications when the
applications exit. This is not a real leak.
---
Gary Jennejohn
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