Fuchsia: Partial implementation of dart:io sockets

runtime/bin/fdutils_fuchsia.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(TARGET_OS_ANDROID)
+#if defined(TARGET_OS_FUCHSIA)
 
 #include "bin/fdutils.h"
 
 #include <errno.h>      // NOLINT
 #include <fcntl.h>      // NOLINT
 #include <sys/ioctl.h>  // NOLINT
 #include <unistd.h>     // NOLINT
 
 #include "platform/signal_blocker.h"
 
@@ skipping 47 matching lines @@
   status = NO_RETRY_EXPECTED(fcntl(fd, F_GETFL));
   if (status < 0) {
     return false;
   }
   *is_blocking = (status & O_NONBLOCK) == 0;
   return true;
 }
 
 
 intptr_t FDUtils::AvailableBytes(intptr_t fd) {
+// TODO(MG-364): Enable this code when it is supported.
+#if 0
   int available;  // ioctl for FIONREAD expects an 'int*' argument.
   int result = NO_RETRY_EXPECTED(ioctl(fd, FIONREAD, &available));
   if (result < 0) {
     return result;
   }
   ASSERT(available >= 0);
   return static_cast<intptr_t>(available);
+#endif
+  errno = ENOTSUP;
+  return -1;
 }
 
 
 ssize_t FDUtils::ReadFromBlocking(int fd, void* buffer, size_t count) {
 #ifdef DEBUG
   bool is_blocking = false;
   ASSERT(FDUtils::IsBlocking(fd, &is_blocking));
   ASSERT(is_blocking);
 #endif
   size_t remaining = count;
   char* buffer_pos = reinterpret_cast<char*>(buffer);
   while (remaining > 0) {
-    ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, buffer_pos, remaining));
+    ssize_t bytes_read = NO_RETRY_EXPECTED(read(fd, buffer_pos, remaining));
     if (bytes_read == 0) {
       return count - remaining;
     } else if (bytes_read == -1) {
       ASSERT(EAGAIN == EWOULDBLOCK);
       // Error code EWOULDBLOCK should only happen for non blocking
       // file descriptors.
       ASSERT(errno != EWOULDBLOCK);
       return -1;
     } else {
       ASSERT(bytes_read > 0);
       remaining -= bytes_read;
       buffer_pos += bytes_read;
     }
   }
   return count;
 }
 
 
 ssize_t FDUtils::WriteToBlocking(int fd, const void* buffer, size_t count) {
 #ifdef DEBUG
   bool is_blocking = false;
   ASSERT(FDUtils::IsBlocking(fd, &is_blocking));
   ASSERT(is_blocking);
 #endif
   size_t remaining = count;
   char* buffer_pos = const_cast<char*>(reinterpret_cast<const char*>(buffer));
   while (remaining > 0) {
-    ssize_t bytes_written =
-        TEMP_FAILURE_RETRY(write(fd, buffer_pos, remaining));
+    ssize_t bytes_written = NO_RETRY_EXPECTED(write(fd, buffer_pos, remaining));
     if (bytes_written == 0) {
       return count - remaining;
     } else if (bytes_written == -1) {
       ASSERT(EAGAIN == EWOULDBLOCK);
       // Error code EWOULDBLOCK should only happen for non blocking
       // file descriptors.
       ASSERT(errno != EWOULDBLOCK);
       return -1;
     } else {
       ASSERT(bytes_written > 0);
       remaining -= bytes_written;
       buffer_pos += bytes_written;
     }
   }
   return count;
 }
 
+
+void FDUtils::SaveErrorAndClose(intptr_t fd) {
+  int err = errno;
+  NO_RETRY_EXPECTED(close(fd));
+  errno = err;
+}
+
 }  // namespace bin
 }  // namespace dart
 
-#endif  // defined(TARGET_OS_ANDROID)
+#endif  // defined(TARGET_OS_FUCHSIA)