Bug#901699: marked as done (libc6-dev: #include <sys/mman.h> doesn't import MAP_ANONYMOUS but man 2 mmap says it does, causing builds to break)
Your message dated Sun, 17 Jun 2018 10:06:55 +0200
with message-id <20180617080655.t5pmguez2u4ig7nj@var.youpi.perso.aquilenet.fr>
and subject line Re: Bug#901699: libc6-dev: #include <sys/mman.h> doesn't import MAP_ANONYMOUS but man 2 mmap says it does, causing builds to break
has caused the Debian Bug report #901699,
regarding libc6-dev: #include <sys/mman.h> doesn't import MAP_ANONYMOUS but man 2 mmap says it does, causing builds to break
to be marked as done.
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--
901699: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=901699
Debian Bug Tracking System
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--- Begin Message ---
Package: libc6-dev
Version: 2.24-11+deb9u1
Severity: normal
Dear Maintainer,
#include <sys/mman.h>
#include "myplatform.h"
void *slaballoc()
{
void *slab = mmap(... MAP_ANONYMOUS ...);
}
does not build due to MAP_ANONYMOUS not being defined. man 2 mmap says this should work.
#include <asm/mman.h>
fixes the problem but is oddly Linux specific. Use of mmap to allocate large slabs w/o using heap is reasonable on any architecture.
-- System Information:
Debian Release: 9.3
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.9.0-6-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages libc6-dev depends on:
ii libc-dev-bin 2.24-11+deb9u1
ii libc6 2.24-11+deb9u1
ii linux-libc-dev 4.9.82-1+deb9u3
libc6-dev recommends no packages.
Versions of packages libc6-dev suggests:
pn glibc-doc <none>
ii manpages-dev 4.10-2
-- no debconf information
--- End Message ---
--- Begin Message ---
Hello,
Joshua, le sam. 16 juin 2018 16:22:10 -0700, a ecrit:
> #include <sys/mman.h>
> #include "myplatform.h"
>
> void *slaballoc()
> {
> void *slab = mmap(... MAP_ANONYMOUS ...);
> }
>
> does not build due to MAP_ANONYMOUS not being defined.
That kind of code does build :) (but only because by defaut gcc defines
_GNU_SOURCE)
Note that MAP_ANONYMOUS and MAP_ANON are not POSIX, so you have to use
e.g. #define _GNU_SOURCE or _BSD_SOURCE to get access to them.
> man 2 mmap says this should work.
It also says “Certain flags constants are defined only if suitable
feature test macros are defined”
Samuel
--- End Message ---
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