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 = base::GetPackageRoot();
  44   computed_path = computed_path.AppendASCII("lib").Append(components[0]);
  45   base::File library(computed_path,
  46                      base::File::FLAG_OPEN | base::File::FLAG_READ);
  47   if (!library.IsValid()) {
  48     if (error) {
  49       error->message = base::StringPrintf(
  50           "open library: %s",
  51           base::File::ErrorToString(library.error_details()).c_str());
  52     }
  53     return nullptr;
  54   }
  55
  56   zx::vmo vmo;
  57   zx_status_t status = fdio_get_vmo_clone(library.GetPlatformFile(),
  58                                           vmo.reset_and_get_address());
  59   if (status != ZX_OK) {
  60     if (error) {
  61       error->message = base::StringPrintf("fdio_get_vmo_clone: %s",
  62                                           zx_status_get_string(status));
  63     }
  64     return nullptr;
  65   }
  66   NativeLibrary result = dlopen_vmo(vmo.get(), RTLD_LAZY | RTLD_LOCAL);
  67   return result;
  68 }
  69
  70 void UnloadNativeLibrary(NativeLibrary library) {
  71   // dlclose() is a no-op on Fuchsia, so do nothing here.
  72 }
  73
  74 void* GetFunctionPointerFromNativeLibrary(NativeLibrary library,
  75                                           StringPiece name) {
  76   return dlsym(library, name.data());
  77 }
  78
  79 std::string GetNativeLibraryName(StringPiece name) {
  80   return base::StringPrintf("lib%s.so", name.as_string().c_str());
  81 }
  82
  83 std::string GetLoadableModuleName(StringPiece name) {
  84   return GetNativeLibraryName(name);
  85 }
  86
  87 }  // namespace base