base/native_library_fuchsia.cc

   1 // Copyright 2018 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/native_library.h"
   6
   7 #include <fcntl.h>
   8 #include <lib/fdio/io.h>
   9 #include <lib/zx/vmo.h>
  10 #include <stdio.h>
  11 #include <zircon/dlfcn.h>
  12 #include <zircon/status.h>
  13 #include <zircon/syscalls.h>
  14
  15 #include "base/base_paths_fuchsia.h"
  16 #include "base/files/file.h"
  17 #include "base/files/file_path.h"
  18 #include "base/fuchsia/fuchsia_logging.h"
  19 #include "base/logging.h"
  20 #include "base/path_service.h"
  21 #include "base/posix/safe_strerror.h"
  22 #include "base/strings/stringprintf.h"
  23 #include "base/strings/utf_string_conversions.h"
  24 #include "base/threading/thread_restrictions.h"
  25
  26 namespace base {
  27
  28 std::string NativeLibraryLoadError::ToString() const {
  29   return message;
  30 }
  31
  32 NativeLibrary LoadNativeLibraryWithOptions(const FilePath& library_path,
  33                                            const NativeLibraryOptions& options,
  34                                            NativeLibraryLoadError* error) {
  35   std::vector<base::FilePath::StringType> components;
  36   library_path.GetComponents(&components);
  37   if (components.size() != 1u) {
  38     NOTREACHED() << "library_path is a path, should be a filename: "
  39                  << library_path.MaybeAsASCII();
  40     return nullptr;
  41   }
  42
  43   FilePath computed_path;
  44   base::PathService::Get(DIR_SOURCE_ROOT, &computed_path);
  45   computed_path = computed_path.AppendASCII("lib").Append(components[0]);
  46   base::File library(computed_path,
  47                      base::File::FLAG_OPEN | base::File::FLAG_READ);
  48   if (!library.IsValid()) {
  49     if (error) {
  50       error->message = base::StringPrintf(
  51           "open library: %s",
  52           base::File::ErrorToString(library.error_details()).c_str());
  53     }
  54     return nullptr;
  55   }
  56
  57   zx::vmo vmo;
  58   zx_status_t status = fdio_get_vmo_clone(library.GetPlatformFile(),
  59                                           vmo.reset_and_get_address());
  60   if (status != ZX_OK) {
  61     if (error) {
  62       error->message = base::StringPrintf("fdio_get_vmo_clone: %s",
  63                                           zx_status_get_string(status));
  64     }
  65     return nullptr;
  66   }
  67   NativeLibrary result = dlopen_vmo(vmo.get(), RTLD_LAZY | RTLD_LOCAL);
  68   return result;
  69 }
  70
  71 void UnloadNativeLibrary(NativeLibrary library) {
  72   // dlclose() is a no-op on Fuchsia, so do nothing here.
  73 }
  74
  75 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
  76                                           StringPiece name) {
  77   return dlsym(library, name.data());
  78 }
  79
  80 std::string GetNativeLibraryName(StringPiece name) {
  81   return base::StringPrintf("lib%s.so", name.as_string().c_str());
  82 }
  83
  84 std::string GetLoadableModuleName(StringPiece name) {
  85   return GetNativeLibraryName(name);
  86 }
  87
  88 }  // namespace base