Attachment 624012 Details for Bug 862413 – memset wrapper

memset wrapper

memset.c (text/plain), 1.61 KB, created by Petr Pisar on 2012-10-09 09:27:10 UTC

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Creator: Petr Pisar

Created: 2012-10-09 09:27:10 UTC

Size: 1.61 KB

patch

obsolete

>#include <stdio.h>
>#include <stdlib.h>
>#include <dlfcn.h>
>#include <stdint.h>
>
>static int check_memset(void *source, int value, size_t count) {
>    unsigned char *memory = (unsigned char *)source;
>    unsigned char pattern = (unsigned char)value;
>
>    for (size_t i = 0; i < count; i++) {
>        if (memory[i] != pattern) {
>            fprintf(stderr, "memset() did not set byte at offset %zu "
>                    "(%p[%zu]=%u != %u)!\n", i, source, i, memory[i], pattern);
>            return -1;
>        }
>    }
>    return 0;
>}
>
>static void *real_memset(void *source, int value, size_t count) {
>#define LIBRARY "libc.so.6"
>#define SYMBOL "memset"
>
>    void *handle;
>    void *(*function)(void *, int, size_t);
>    void *retval;
>
>    handle = dlopen(LIBRARY, RTLD_LAZY);
>    if (NULL == handle) {
>        fprintf(stderr, "Could not load library %s: %s\n",
>                LIBRARY, dlerror());
>        abort();
>    }
>    
>    dlerror();
>    function = dlsym(handle, SYMBOL);
>    if (NULL == function) {
>        fprintf(stderr, "Could not find symbol %s: %s\n",
>                SYMBOL, dlerror());
>        abort();
>    }
>
>    retval = (*function)(source, value, count);
>    if (check_memset(source, value, count)) {
>        abort();
>    }
>
>    if (dlclose(handle)) {
>        fprintf(stderr, "Could not unload library %s: %s\n",
>                LIBRARY, dlerror());
>        abort();
>    }
>
>    return retval;
>#undef LIBRARY
>#undef SYMBOL
>}
>
>void *memset(void *source, int value, size_t count) {
>    fprintf(stderr, "Called: memset(source=%p, value=%d, count=%zu)\n",
>            source, value, count);
>    return real_memset(source, value, count);
>}

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Attachments on bug 862413: 624012 | 624190 | 624842 | 704824