mmap(READ_ONLY) and core

[Pavel Krauz]

Hello

I tried this prog that generates core. But I am not able to access the mapped addresses
inside the debugger when I load the core. Does anybody know if this is a kernel
(2.4.20) or gdb problem?

cheers
Pavel


(gdb) print addr
$1 = 0x40014000 <Address 0x40014000 out of bounds>
(gdb) print *addr
Cannot access memory at address 0x40014000


#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
        int fd;
        char *addr;

        if ((fd = open(argv[1], O_RDONLY)) < 0) {
                fprintf(stderr, "can't open %s for r/w\n", argv[1]);
                exit(1);
        }
        if (!(addr = mmap(0, 64, PROT_READ, MAP_SHARED, fd, 0))) {
                fprintf(stderr, "can't mmap %s\n", argv[1]);
                exit(1);
        }

        *addr = 0;

        return 0;
}



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