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    SubjectConcerning a post that you made about expandable anonymous shared mappings
    I read a post that you made about not being able to expand anonymous 
    shared mapping with mremap(). And I am actually having that issue now.

    You made the post in 2004 and we are now in 2007. I would like to know
    if that feature was added because the code below always fail with bus
    error on my machine. I use glibc 2.5

    Thank you for helping.

    #define _GNU_SOURCE
    #include <sys/mman.h>
    #include <unistd.h>

    #include <stdio.h>

    main() {
    void *ptr;
    if ((ptr=mmap(0, 4096, PROT_READ|PROT_WRITE,
    MAP_ANONYMOUS|MAP_SHARED|MAP_GROWSDOWN, 0, 0)) == -1) {
    printf("failed to mmap\n");
    return;
    }

    if ((ptr=mremap(ptr, 4096, 8192, MREMAP_MAYMOVE)) == -1) {
    printf("failed to mremap\n");
    return;
    }

    //why does this failed. I am well in the interval [4096, 8192]
    *(unsigned int *)(ptr + 4096 + 8)= 10;
    }
    -
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