Date: Wed, 5 Apr 2006 16:43:04 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Wojciech Puchar <wojtek@tensor.3miasto.net> Cc: freebsd-questions@freebsd.org Subject: Re: programmer questions - MMAP Message-ID: <20060405214304.GG32089@dan.emsphone.com> In-Reply-To: <20060405231726.W81334@chylonia.3miasto.net> References: <20060405231726.W81334@chylonia.3miasto.net>
next in thread | previous in thread | raw e-mail | index | archive | help
In the last episode (Apr 05), Wojciech Puchar said:
> the question is - why character 'a' isn't written!??!?!
>
> #include <sys/mman.h>
> #include <fcntl.h>
> #include <stdio.h>
> #include <unistd.h>
> main() {
> int ff=open("test",O_RDWR|O_CREAT,0666);
> char *adr;
> lseek(ff,1<<24,0);
> write(ff,"",1);
> adr=mmap(0,1<<24,PROT_READ|PROT_WRITE,MAP_NOCORE,ff,0);
Try MAP_NOCORE|MAP_SHARED here. It's probably defaulting to a private
mapping.
--
Dan Nelson
dnelson@allantgroup.com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20060405214304.GG32089>