Date: Sat, 9 May 2009 22:07:24 +0200 From: Jilles Tjoelker <jilles@stack.nl> To: Lothar Scholz <scholz@scriptolutions.com> Cc: freebsd-arch@freebsd.org Subject: Re: Posix shared memory problem Message-ID: <20090509200724.GA25714@stack.nl> In-Reply-To: <588815840.20090509203115@scriptolutions.com> References: <588815840.20090509203115@scriptolutions.com>
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On Sat, May 09, 2009 at 08:31:15PM +0200, Lothar Scholz wrote:
> Thanks for solving the posix semaphore problem. But with shared memory
> there comes the next issue:
> int main() {
> int m;
> shm_unlink("/barfoo");
> m = shm_open("/barfoo", O_RDWR|O_CREAT|O_EXCL, S_IRWXU);
> if (m == 1) perror("shm_open error");
> }
> i always get permission denied error, and i tried many values
> for flags and mode? I can only get this working as root but not
> as a normal user.
shm_open/shm_unlink refer to the filesystem; they are fairly direct
wrappers around open and unlink.
POSIX suggests making the pathname a configuration option;
alternatively, using a directory for temporary files such as /tmp could
work.
--
Jilles Tjoelker
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