1. I have used 4 MB of shared memory without any ill effects. That's
probably not the problem
2. Exactly where is your program crashing? Have you used gbd to examine the
state of the program and determine which line was being executed when the
crash occurred? ( gdb myprog core)
> -----Original Message-----
> From: Frederic Cazenave [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, November 18, 1999 1:06 PM
> To: [EMAIL PROTECTED]
> Subject: [rtl] Share Men
>
> Hi,
>
> Sorry to send an other question concerning share memory but ....
>
> My system was working correctly until I've decided to increase
> my share memory to add a large ring buffer. Now the system crash
> hardly without debuging information. So I have tryed to run a small
> test program without success.
>
> my system is
> uname -a
> Linux lthemc19.hmg.inpg.fr 2.0.36.RTL1.1 #1 Fri Mar 26 21:27:38 CET 1999
> i586 unknown
>
> my lilo.conf is :
> more /etc/lilo.conf
> boot=/dev/sda
> map=/boot/map
> install=/boot/boot.b
> prompt
> timeout=50
> image=/boot/rt-vmlinuz-2.0.36
> label=rtlinux
> root=/dev/sda1
> read-only
> append="mem=126m"
>
> my meminfo :
> cat /proc/meminfo
> total: used: free: shared: buffers: cached:
> Mem: 128937984 126701568 2236416 23920640 85069824 18231296
> Swap: 90439680 4096 90435584
> MemTotal: 125916 kB
> MemFree: 2184 kB
> MemShared: 23360 kB
> Buffers: 83076 kB
> Cached: 17804 kB
> SwapTotal: 88320 kB
> SwapFree: 88316 kB
>
> The total of mem should be around 126 meg and note 128 ??????
>
>
> my test program :
> #include <stdio.h>
> #include <stdlib.h>
> #include <sys/mman.h>
> #include <fcntl.h>
>
> #define ADDRESS (126*0x100000)
>
> main(void)
> {
> char *user_ptr,*ptr;
> int fdm;
> int i;
>
> if ((fdm = open("/dev/mem", O_RDONLY)) < 0) {
> fprintf(stderr, "Error opening /dev/mem \n");
> exit(1);
> }
> user_ptr = (char * ) mmap ( 0, 0x100000, PROT_READ,
> MAP_FILE |MAP_PRIVATE, fdm, ADDRESS);
> if (MAP_FAILED == user_ptr)
> {
> /* handle error here */
> close(fdm);
> printf("perdu\n");
> }
>
> memset(user_ptr, 0,0x100000);
> munmap ( user_ptr, 0x100000 );
> close(fdm);
> }
>
>
> On the memset I have a core dump ??
>
> Where is my mistake ???
>
> Thank you in advance for your help
>
>
> Fred
>
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