1// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
2// for details. All rights reserved. Use of this source code is governed by a
3// BSD-style license that can be found in the LICENSE file.
4
5#ifndef RUNTIME_BIN_FDUTILS_H_
6#define RUNTIME_BIN_FDUTILS_H_
7
8#include "bin/builtin.h"
9#include "platform/globals.h"
10
11namespace dart {
12namespace bin {
13
14class FDUtils {
15 public:
16 static bool SetCloseOnExec(intptr_t fd);
17
18 static bool SetNonBlocking(intptr_t fd);
19 static bool SetBlocking(intptr_t fd);
20
21 // Checks whether the file descriptor is blocking. If the function
22 // returns true the value pointed to by is_blocking will be set to
23 // the blocking state of the file descriptor. If the function
24 // returns false the system call for checking the file descriptor
25 // failed and the value pointed to by is_blocking is not modified.
26 static bool IsBlocking(intptr_t fd, bool* is_blocking);
27
28 static intptr_t AvailableBytes(intptr_t fd);
29
30 // Reads the requested number of bytes from a file descriptor. This
31 // function will only return on short reads if an error occours in
32 // which case it returns -1 and errno is still valid. The file
33 // descriptor must be in blocking mode.
34 static ssize_t ReadFromBlocking(int fd, void* buffer, size_t count);
35
36 // Writes the requested number of bytes to a file descriptor. This
37 // function will only return on short writes if an error occours in
38 // which case it returns -1 and errno is still valid. The file
39 // descriptor must be in blocking mode.
40 static ssize_t WriteToBlocking(int fd, const void* buffer, size_t count);
41
42 // Closes fd without modifying errno.
43 static void SaveErrorAndClose(intptr_t fd);
44
45 private:
46 DISALLOW_ALLOCATION();
47 DISALLOW_IMPLICIT_CONSTRUCTORS(FDUtils);
48};
49
50} // namespace bin
51} // namespace dart
52
53#endif // RUNTIME_BIN_FDUTILS_H_
54