C++ (Cpp) set_dlerror Examples

Example #1

File: dlfcn.c Project: Akin-Net/mozilla-central

void *__wrap_dlsym(void *handle, const char *symbol)
{
    if (extractLibs)
        return dlsym(handle, symbol);

    soinfo *found;
    Elf32_Sym *sym;
    unsigned bind;

    pthread_mutex_lock(&dl_lock);

    if(unlikely(handle == 0)) { 
        set_dlerror(DL_ERR_INVALID_LIBRARY_HANDLE);
        goto err;
    }
    if(unlikely(symbol == 0)) {
        set_dlerror(DL_ERR_BAD_SYMBOL_NAME);
        goto err;
    }

    if(handle == RTLD_DEFAULT) {
        sym = lookup(symbol, &found, NULL);
    } else if(handle == RTLD_NEXT) {
        void *ret_addr = __builtin_return_address(0);
        soinfo *si = find_containing_library(ret_addr);

        sym = NULL;
        if(si && si->next) {
            sym = lookup(symbol, &found, si->next);
        }
    } else {
        found = (soinfo*)handle;
        sym = lookup_in_library(found, symbol);
    }

    if(likely(sym != 0)) {
        bind = ELF32_ST_BIND(sym->st_info);

        if(likely((bind == STB_GLOBAL) && (sym->st_shndx != 0))) {
            unsigned ret = sym->st_value + found->base;
            pthread_mutex_unlock(&dl_lock);
            return (void*)ret;
        }

        set_dlerror(DL_ERR_SYMBOL_NOT_GLOBAL);
    }
    else
        set_dlerror(DL_ERR_SYMBOL_NOT_FOUND);

err:
    pthread_mutex_unlock(&dl_lock);
    return 0;
}

Example #2

File: dlfcn.c Project: ritesh96310/dexandroid

void *dlsym(void *handle, const char *symbol)
{
    soinfo *found;
    Elf32_Sym *sym;
    unsigned bind;

    pthread_mutex_lock(&dl_lock);

    if(unlikely(handle == 0)) { 
        set_dlerror(DL_ERR_INVALID_LIBRARY_HANDLE);
        goto err;
    }
    if(unlikely(symbol == 0)) {
        set_dlerror(DL_ERR_BAD_SYMBOL_NAME);
        goto err;
    }

    if(handle == RTLD_DEFAULT) {
        sym = lookup(symbol, &found);
    } else if(handle == RTLD_NEXT) {
        sym = lookup(symbol, &found);
    } else {
        found = (soinfo*)handle;
        sym = lookup_in_library(found, symbol);
    }

    if(likely(sym != 0)) {
        bind = ELF32_ST_BIND(sym->st_info);

        if(likely((bind == STB_GLOBAL) && (sym->st_shndx != 0))) {
            unsigned ret = sym->st_value + found->base;
            pthread_mutex_unlock(&dl_lock);
            return (void*)ret;
        }

        set_dlerror(DL_ERR_SYMBOL_NOT_GLOBAL);
    }
    else
        set_dlerror(DL_ERR_SYMBOL_NOT_FOUND);

err:
    pthread_mutex_unlock(&dl_lock);
    return 0;
}

Example #3

File: dlfcn.c Project: ritesh96310/dexandroid

void *dlopen(const char *filename, int flag)
{
    soinfo *ret;

    pthread_mutex_lock(&dl_lock);
    ret = find_library(filename);
    if (unlikely(ret == NULL)) {
        set_dlerror(DL_ERR_CANNOT_LOAD_LIBRARY);
    } else {
        ret->refcount++;
    }
    pthread_mutex_unlock(&dl_lock);
    return ret;
}

Example #4

File: dlfcn.c Project: Akin-Net/mozilla-central

void *moz_mapped_dlopen(const char *filename, int flag,
                        int fd, void *mem, unsigned int len, unsigned int offset)
{
    soinfo *ret;

    pthread_mutex_lock(&dl_lock);
    ret = find_mapped_library(filename, fd, mem, len, offset);
    if (unlikely(ret == NULL)) {
        set_dlerror(DL_ERR_CANNOT_LOAD_LIBRARY);
    } else {
        ret->refcount++;
    }
    pthread_mutex_unlock(&dl_lock);
    return ret;
}

Example #5

File: dlfcn.c Project: crowriot/apkenv

void *android_dlsym(void *handle, const char *symbol)
{
    soinfo *found;
    Elf32_Sym *sym;
    unsigned bind;

    pthread_mutex_lock(&dl_lock);

    if(unlikely(handle == 0)) {
        set_dlerror(DL_ERR_INVALID_LIBRARY_HANDLE);
        goto err;
    }
    if(unlikely(symbol == 0)) {
        set_dlerror(DL_ERR_BAD_SYMBOL_NAME);
        goto err;
    }

    void *sym_addr;
    if(0 != (sym_addr = get_hooked_symbol_dlfcn(handle, symbol)))
    {
        LINKER_DEBUG_PRINTF("symbol %s hooked to %x\n",symbol,sym_addr);
        pthread_mutex_unlock(&dl_lock);
        return sym_addr;
    }
    if (is_builtin_lib_handle(handle)) {
        /* must be hooked.. */
        set_dlerror(DL_ERR_SYMBOL_NOT_FOUND);
        goto err;
    }

    if(handle == RTLD_DEFAULT) {
        sym = lookup(symbol, &found, NULL);
    } else if(handle == RTLD_NEXT) {
        void *ret_addr = __builtin_return_address(0);
        soinfo *si = find_containing_library(ret_addr);

        sym = NULL;
        if(si && si->next) {
            sym = lookup(symbol, &found, si->next);
        }
    } else {
        found = (soinfo*)handle;
        sym = lookup_in_library(found, symbol);
    }

    if(likely(sym != 0)) {
        bind = ELF32_ST_BIND(sym->st_info);

        if(likely((bind == STB_GLOBAL) && (sym->st_shndx != 0))) {
            unsigned ret = sym->st_value + found->base;
            pthread_mutex_unlock(&dl_lock);
            return create_wrapper((char*)symbol, (void*)ret, WRAPPER_DYNHOOK);
        }

        set_dlerror(DL_ERR_SYMBOL_NOT_GLOBAL);
    }
    else
        set_dlerror(DL_ERR_SYMBOL_NOT_FOUND);

err:
    LINKER_DEBUG_PRINTF("symbol %s has not been hooked\n",symbol);
    pthread_mutex_unlock(&dl_lock);
    return 0;
}