Bug#156697: marked as done (libc6: posix_memalign() uses its arguments incorrectly)
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and subject line Bug#156697: libc6: posix_memalign() uses its arguments incorrectly
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Subject: libc6: posix_memalign() uses its arguments incorrectly
From: "Wessel Dankers" <wsl@fruit.eu.org>
To: "Debian Bug Tracking System" <submit@bugs.debian.org>
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Date: Wed, 14 Aug 2002 19:58:40 +0200
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Package: libc6
Version: 2.2.5-13
Severity: normal
When I invoke posix_memalign() like this (pagesize == 4096, BUFSIZE == 12M):
char *s;
posix_memalign(&s, pagesize, BUFSIZE)
It fails, but does not set errno with a reason. However, when I invoke
it like this:
posix_memalign(&s, BUFSIZE, pagesize)
It succeeds, and allocates a suitable memory region (if I decrease
BUFSIZE below what my application really needs, it segfaults just as
one would expect). However, the allocated region is aligned to the size
of the allocated memory region (if I decrease BUFSIZE, the alignment
also becomes more lax).
The documentation states:
Function: int posix_memalign (void **memptr, size_t alignment, size_t size)
...which means (I think( that the first thing I tried was the correct one.
These are the versions of gcc I tried:
gcc version 2.95.4 20011002 (Debian prerelease)
gcc version 3.0.4
gcc version 3.1.1
gcc version 3.2 20020809 (Debian prerelease)
I suspect that the fix is trivial :)
-- System Information:
Debian Release: unstable
Architecture: i386
Kernel: Linux bzzrt 2.4.19-wsl #1 Tue Aug 6 04:13:00 CEST 2002 i686
Locale: LANG=C, LC_CTYPE=C
-- no debconf information
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Date: Wed, 30 Jun 2004 09:32:50 +0900
Message-ID: <81u0wtkhql.wl@omega.webmasters.gr.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: "Wessel Dankers" <wsl@fruit.eu.org>, 156697-done@bugs.debian.org
Subject: Re: Bug#156697: libc6: posix_memalign() uses its arguments incorrectly
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At Wed, 14 Aug 2002 19:58:40 +0200,
Wessel Dankers wrote:
> When I invoke posix_memalign() like this (pagesize == 4096, BUFSIZE == 12M):
>
> char *s;
> posix_memalign(&s, pagesize, BUFSIZE)
>
> It fails, but does not set errno with a reason. However, when I invoke
If it's failed, posix_memalign returns error, instead of setting errno.
> it like this:
>
> posix_memalign(&s, BUFSIZE, pagesize)
>
> It succeeds, and allocates a suitable memory region (if I decrease
> BUFSIZE below what my application really needs, it segfaults just as
> one would expect). However, the allocated region is aligned to the size
> of the allocated memory region (if I decrease BUFSIZE, the alignment
> also becomes more lax).
>
> The documentation states:
>
> Function: int posix_memalign (void **memptr, size_t alignment, size_t size)
>
> ...which means (I think( that the first thing I tried was the correct one.
> These are the versions of gcc I tried:
>
> gcc version 2.95.4 20011002 (Debian prerelease)
> gcc version 3.0.4
> gcc version 3.1.1
> gcc version 3.2 20020809 (Debian prerelease)
I confirmed the latest glibc 2.3.2.ds1-13 + gcc 3.3.x should
work correctly.
gotom@moog:~/debian/glibc/bugs/156697> cat posix_memalign.c
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
size_t pagesize = 4096;
size_t BUFSIZE = 12 * 1024 * 1024;
char *s;
int err;
sleep(10);
err = posix_memalign(&s, pagesize, BUFSIZE);
printf("%d\n", err);
sleep(10);
return 0;
}
gotom@moog:~/debian/glibc/bugs/156697> gcc -o posix_memalign posix_memalign.c
gotom@moog:~/debian/glibc/bugs/156697> ./posix_memalign
^Z
gotom@moog:~/debian/glibc/bugs/156697> ps auxw | grep posix
gotom 17976 0.0 0.0 1368 248 pts/169 T 09:36 0:00 ./posix_memalign
gotom@moog:~/debian/glibc/bugs/156697> fg
./posix_memalign
0
^Z
gotom@moog:~/debian/glibc/bugs/156697> ps auxw | grep posix
gotom 17976 0.0 0.0 13668 332 pts/169 T 09:36 0:00 ./posix_memalign
I close this bug.
Regards,
-- gotom
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