[dart:io] Namespaces for file IO

runtime/bin/file_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(HOST_OS_MACOS)
 
 #include "bin/file.h"
 
 #include <copyfile.h>  // NOLINT
 #include <errno.h>     // NOLINT
 #include <fcntl.h>     // NOLINT
 #include <libgen.h>    // NOLINT
 #include <limits.h>    // NOLINT
 #include <sys/mman.h>  // NOLINT
 #include <sys/stat.h>  // NOLINT
 #include <unistd.h>    // NOLINT
 #include <utime.h>     // NOLINT
 
 #include "bin/builtin.h"
 #include "bin/fdutils.h"
 #include "bin/log.h"
-
+#include "bin/namespace.h"
 #include "platform/signal_blocker.h"
 #include "platform/utils.h"
 
 namespace dart {
 namespace bin {
 
 class FileHandle {
  public:
   explicit FileHandle(int fd) : fd_(fd) {}
   ~FileHandle() {}
@@ skipping 157 matching lines @@
     return st.st_size;
   }
   return -1;
 }
 
 File* File::FileOpenW(const wchar_t* system_name, FileOpenMode mode) {
   UNREACHABLE();
   return NULL;
 }
 
-File* File::Open(const char* name, FileOpenMode mode) {
+File* File::Open(Namespace* namespc, const char* name, FileOpenMode mode) {
   // Report errors for non-regular files.
   struct stat st;
   if (NO_RETRY_EXPECTED(stat(name, &st)) == 0) {
     // Only accept regular files, character devices, and pipes.
     if (!S_ISREG(st.st_mode) && !S_ISCHR(st.st_mode) && !S_ISFIFO(st.st_mode)) {
       errno = (S_ISDIR(st.st_mode)) ? EISDIR : ENOENT;
       return NULL;
     }
   }
   int flags = O_RDONLY;
@@ skipping 20 matching lines @@
       return NULL;
     }
   }
   return new File(new FileHandle(fd));
 }
 
 File* File::OpenStdio(int fd) {
   return ((fd < 0) || (2 < fd)) ? NULL : new File(new FileHandle(fd));
 }
 
-bool File::Exists(const char* name) {
+bool File::Exists(Namespace* namespc, const char* name) {
   struct stat st;
   if (NO_RETRY_EXPECTED(stat(name, &st)) == 0) {
     // Everything but a directory and a link is a file to Dart.
     return !S_ISDIR(st.st_mode) && !S_ISLNK(st.st_mode);
   } else {
     return false;
   }
 }
 
-bool File::Create(const char* name) {
+bool File::Create(Namespace* namespc, const char* name) {
   int fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY | O_CREAT, 0666));
   if (fd < 0) {
     return false;
   }
   // File.create returns a File, so we shouldn't be giving the illusion that the
   // call has created a file or that a file already exists if there is already
   // an entity at the same path that is a directory or a link.
   bool is_file = true;
   struct stat st;
   if (NO_RETRY_EXPECTED(fstat(fd, &st)) == 0) {
     if (S_ISDIR(st.st_mode)) {
       errno = EISDIR;
       is_file = false;
     } else if (S_ISLNK(st.st_mode)) {
       errno = ENOENT;
       is_file = false;
     }
   }
   FDUtils::SaveErrorAndClose(fd);
   return is_file;
 }
 
-bool File::CreateLink(const char* name, const char* target) {
+bool File::CreateLink(Namespace* namespc,
+                      const char* name,
+                      const char* target) {
   int status = NO_RETRY_EXPECTED(symlink(target, name));
   return (status == 0);
 }
 
-File::Type File::GetType(const char* pathname, bool follow_links) {
+File::Type File::GetType(Namespace* namespc,
+                         const char* pathname,
+                         bool follow_links) {
   struct stat entry_info;
   int stat_success;
   if (follow_links) {
     stat_success = NO_RETRY_EXPECTED(stat(pathname, &entry_info));
   } else {
     stat_success = NO_RETRY_EXPECTED(lstat(pathname, &entry_info));
   }
   if (stat_success == -1) {
     return File::kDoesNotExist;
   }
   if (S_ISDIR(entry_info.st_mode)) {
     return File::kIsDirectory;
   }
   if (S_ISREG(entry_info.st_mode)) {
     return File::kIsFile;
   }
   if (S_ISLNK(entry_info.st_mode)) {
     return File::kIsLink;
   }
   return File::kDoesNotExist;
 }
 
-static bool CheckTypeAndSetErrno(const char* name,
+static bool CheckTypeAndSetErrno(Namespace* namespc,
+                                 const char* name,
                                  File::Type expected,
                                  bool follow_links) {
-  File::Type actual = File::GetType(name, follow_links);
+  File::Type actual = File::GetType(namespc, name, follow_links);
   if (actual == expected) {
     return true;
   }
   switch (actual) {
     case File::kIsDirectory:
       errno = EISDIR;
       break;
     case File::kDoesNotExist:
       errno = ENOENT;
       break;
     default:
       errno = EINVAL;
       break;
   }
   return false;
 }
 
-bool File::Delete(const char* name) {
-  return CheckTypeAndSetErrno(name, kIsFile, true) &&
+bool File::Delete(Namespace* namespc, const char* name) {
+  return CheckTypeAndSetErrno(namespc, name, kIsFile, true) &&
          (NO_RETRY_EXPECTED(unlink(name)) == 0);
 }
 
-bool File::DeleteLink(const char* name) {
-  return CheckTypeAndSetErrno(name, kIsLink, false) &&
+bool File::DeleteLink(Namespace* namespc, const char* name) {
+  return CheckTypeAndSetErrno(namespc, name, kIsLink, false) &&
          (NO_RETRY_EXPECTED(unlink(name)) == 0);
 }
 
-bool File::Rename(const char* old_path, const char* new_path) {
-  return CheckTypeAndSetErrno(old_path, kIsFile, true) &&
+bool File::Rename(Namespace* namespc,
+                  const char* old_path,
+                  const char* new_path) {
+  return CheckTypeAndSetErrno(namespc, old_path, kIsFile, true) &&
          (NO_RETRY_EXPECTED(rename(old_path, new_path)) == 0);
 }
 
-bool File::RenameLink(const char* old_path, const char* new_path) {
-  return CheckTypeAndSetErrno(old_path, kIsLink, false) &&
+bool File::RenameLink(Namespace* namespc,
+                      const char* old_path,
+                      const char* new_path) {
+  return CheckTypeAndSetErrno(namespc, old_path, kIsLink, false) &&
          (NO_RETRY_EXPECTED(rename(old_path, new_path)) == 0);
 }
 
-bool File::Copy(const char* old_path, const char* new_path) {
-  return CheckTypeAndSetErrno(old_path, kIsFile, true) &&
+bool File::Copy(Namespace* namespc,
+                const char* old_path,
+                const char* new_path) {
+  return CheckTypeAndSetErrno(namespc, old_path, kIsFile, true) &&
          (copyfile(old_path, new_path, NULL, COPYFILE_ALL) == 0);
 }
 
-static bool StatHelper(const char* name, struct stat* st) {
+static bool StatHelper(Namespace* namespc, const char* name, struct stat* st) {
   if (NO_RETRY_EXPECTED(stat(name, st)) != 0) {
     return false;
   }
   // Signal an error if it's a directory.
   if (S_ISDIR(st->st_mode)) {
     errno = EISDIR;
     return false;
   }
   // Otherwise assume the caller knows what it's doing.
   return true;
 }
 
-int64_t File::LengthFromPath(const char* name) {
+int64_t File::LengthFromPath(Namespace* namespc, const char* name) {
   struct stat st;
-  if (!StatHelper(name, &st)) {
+  if (!StatHelper(namespc, name, &st)) {
     return -1;
   }
   return st.st_size;
 }
 
 static int64_t TimespecToMilliseconds(const struct timespec& t) {
   return static_cast<int64_t>(t.tv_sec) * 1000L +
          static_cast<int64_t>(t.tv_nsec) / 1000000L;
 }
 
-void File::Stat(const char* name, int64_t* data) {
+void File::Stat(Namespace* namespc, const char* name, int64_t* data) {
   struct stat st;
   if (NO_RETRY_EXPECTED(stat(name, &st)) == 0) {
     if (S_ISREG(st.st_mode)) {
       data[kType] = kIsFile;
     } else if (S_ISDIR(st.st_mode)) {
       data[kType] = kIsDirectory;
     } else if (S_ISLNK(st.st_mode)) {
       data[kType] = kIsLink;
     } else {
       data[kType] = kDoesNotExist;
     }
     data[kCreatedTime] = st.st_ctime;
     data[kModifiedTime] = st.st_mtime;
     data[kAccessedTime] = st.st_atime;
     data[kCreatedTime] = TimespecToMilliseconds(st.st_ctimespec);
     data[kModifiedTime] = TimespecToMilliseconds(st.st_mtimespec);
     data[kAccessedTime] = TimespecToMilliseconds(st.st_atimespec);
     data[kMode] = st.st_mode;
     data[kSize] = st.st_size;
   } else {
     data[kType] = kDoesNotExist;
   }
 }
 
-time_t File::LastModified(const char* name) {
+time_t File::LastModified(Namespace* namespc, const char* name) {
   struct stat st;
-  if (!StatHelper(name, &st)) {
+  if (!StatHelper(namespc, name, &st)) {
     return -1;
   }
   return st.st_mtime;
 }
 
-time_t File::LastAccessed(const char* name) {
+time_t File::LastAccessed(Namespace* namespc, const char* name) {
   struct stat st;
-  if (!StatHelper(name, &st)) {
+  if (!StatHelper(namespc, name, &st)) {
     return -1;
   }
   return st.st_atime;
 }
 
-bool File::SetLastAccessed(const char* name, int64_t millis) {
+bool File::SetLastAccessed(Namespace* namespc,
+                           const char* name,
+                           int64_t millis) {
   // First get the current times.
   struct stat st;
-  if (!StatHelper(name, &st)) {
+  if (!StatHelper(namespc, name, &st)) {
     return false;
   }
 
   // Set the new time:
   struct utimbuf times;
   times.actime = millis / kMillisecondsPerSecond;
   times.modtime = st.st_mtime;
   return utime(name, &times) == 0;
 }
 
-bool File::SetLastModified(const char* name, int64_t millis) {
+bool File::SetLastModified(Namespace* namespc,
+                           const char* name,
+                           int64_t millis) {
   // First get the current times.
   struct stat st;
-  if (!StatHelper(name, &st)) {
+  if (!StatHelper(namespc, name, &st)) {
     return false;
   }
 
   // Set the new time:
   struct utimbuf times;
   times.actime = st.st_atime;
   times.modtime = millis / kMillisecondsPerSecond;
   return utime(name, &times) == 0;
 }
 
-const char* File::LinkTarget(const char* pathname) {
+const char* File::LinkTarget(Namespace* namespc, const char* pathname) {
   struct stat link_stats;
   if (lstat(pathname, &link_stats) != 0) {
     return NULL;
   }
   if (!S_ISLNK(link_stats.st_mode)) {
     errno = ENOENT;
     return NULL;
   }
   // Don't rely on the link_stats.st_size for the size of the link
   // target. The link might have changed before the readlink call.
   const int kBufferSize = 1024;
   char target[kBufferSize];
   size_t target_size =
       TEMP_FAILURE_RETRY(readlink(pathname, target, kBufferSize));
   if (target_size <= 0) {
     return NULL;
   }
   char* target_name = DartUtils::ScopedCString(target_size + 1);
   ASSERT(target_name != NULL);
   memmove(target_name, target, target_size);
   target_name[target_size] = '\0';
   return target_name;
 }
 
 bool File::IsAbsolutePath(const char* pathname) {
   return (pathname != NULL && pathname[0] == '/');
 }
 
-const char* File::GetCanonicalPath(const char* pathname) {
+const char* File::GetCanonicalPath(Namespace* namespc, const char* pathname) {
   char* abs_path = NULL;
   if (pathname != NULL) {
     // On some older MacOs versions the default behaviour of realpath allocating
     // space for the resolved_path when a NULL is passed in does not seem to
     // work, so we explicitly allocate space.
     char* resolved_path = DartUtils::ScopedCString(PATH_MAX + 1);
     ASSERT(resolved_path != NULL);
     do {
       abs_path = realpath(pathname, resolved_path);
     } while ((abs_path == NULL) && (errno == EINTR));
@@ skipping 26 matching lines @@
   }
   if (S_ISSOCK(buf.st_mode)) {
     return kSocket;
   }
   if (S_ISREG(buf.st_mode)) {
     return kFile;
   }
   return kOther;
 }
 
-File::Identical File::AreIdentical(const char* file_1, const char* file_2) {
+File::Identical File::AreIdentical(Namespace* namespc,
+                                   const char* file_1,
+                                   const char* file_2) {
   struct stat file_1_info;
   struct stat file_2_info;
   if ((NO_RETRY_EXPECTED(lstat(file_1, &file_1_info)) == -1) ||
       (NO_RETRY_EXPECTED(lstat(file_2, &file_2_info)) == -1)) {
     return File::kError;
   }
   return ((file_1_info.st_ino == file_2_info.st_ino) &&
           (file_1_info.st_dev == file_2_info.st_dev))
              ? File::kIdentical
              : File::kDifferent;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(HOST_OS_MACOS)