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From "MATHIHALLI,MADHUSUDAN (HP-Cupertino,ex1)" <madhusudan_mathiha...@hp.com>
Subject RE: configure option to specify mmap/shm
Date Thu, 07 Feb 2002 18:19:45 GMT
I wrote a small test program - attached is the program and the output.. 

-Madhu


$ ./xx
mmap: No such device
$
$
$ ls -ld /dev/zero
crw-rw-rw-   1 bin        sys          3 0x000004 Jul 17  2001 /dev/zero

#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>

int main(int argc, char *argv[])
{
    void *m;
    int tmpfd;
    char *filename = NULL;

    if (filename == NULL) {
        if ((tmpfd = open("/dev/zero", O_RDWR, 0666)) < 0) {
            perror("open");
            return -1;
        }

        m = mmap(NULL, 256000, PROT_READ|PROT_WRITE, MAP_SHARED, tmpfd, 0);
        if (m == MAP_FAILED) {
            perror("mmap");
            return -1;
        }

        if (munmap(m, 256000) == -1) {
            perror("munmap");
            return -1;
        }
    }
    return 0;
}

-----Original Message-----
From: Aaron Bannert [mailto:aaron@clove.org]
Sent: Thursday, February 07, 2002 9:47 AM
To: dev@httpd.apache.org
Subject: Re: configure option to specify mmap/shm


On Thu, Feb 07, 2002 at 09:21:20AM -0800, MATHIHALLI,MADHUSUDAN
(HP-Cupertino,ex1) wrote:
> Nope.. It does not work (for me).. That's the reason I need to change to
to
> use SHMGET_ANON.. I was thinking that there'a already a option available
to
> do such things..
> 
> BTW, is it not strange that it picks up APR_USE_SHMEM_SHMGET, but not
> APR_USE_SHMEM_SHMGET_ANON and rather decides to select
> APR_USE_SHMEM_MMAP_ZERO.. 

For anonymous shared memory, it prefers MMAP_ZERO over SHMGET_ANON.
You probably have these on your system:
header:sys/mman.h
func:mmap()
func:munmap()
file:/dev/zero

Is there anything else we could test to see if it's not working? Is it
possible that MMAP_ZERO's implementation is simple broken? Send me
the error you are seeing, and optionally a truss output also.

-aaron

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