child_process_sandbox_support_linux.h revision c2e0dbddbe15c98d52c4786dac06cb8952a8ae6d 
1// Copyright (c) 2012 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#ifndef CONTENT_PULIC_COMMON_CHILD_PROCESS_SANDBOX_SUPPORT_LINUX_H_
6#define CONTENT_PULIC_COMMON_CHILD_PROCESS_SANDBOX_SUPPORT_LINUX_H_
7
8#include <stdint.h>
9#include <string>
10
11#include "content/common/content_export.h"
12
13namespace content {
14
15// Returns a file descriptor for a shared memory segment.  The
16// executable flag indicates that the caller intends to use mprotect
17// with PROT_EXEC after making a mapping, but not that it intends to
18// mmap with PROT_EXEC in the first place.  (Some systems, such as
19// ChromeOS, disallow PROT_EXEC in mmap on /dev/shm files but do allow
20// PROT_EXEC in mprotect on mappings from such files.  This function
21// can yield an object that has that constraint.)
22CONTENT_EXPORT int MakeSharedMemorySegmentViaIPC(size_t length,
23                                                 bool executable);
24
25// Return a read-only file descriptor to the font which best matches the given
26// properties or -1 on failure.
27//   charset: specifies the language(s) that the font must cover. See
28// render_sandbox_host_linux.cc for more information.
29CONTENT_EXPORT int MatchFontWithFallback(const std::string& face, bool bold,
30                                         bool italic, int charset);
31
32// GetFontTable loads a specified font table from an open SFNT file.
33//   fd: a file descriptor to the SFNT file. The position doesn't matter.
34//   table_tag: the table tag in *big-endian* format, or 0 for the entire font.
35//   offset: offset into the table or entire font where loading should start.
36//     The offset must be between 0 and 1 GB - 1.
37//   output: a buffer of size output_length that gets the data.  can be 0, in
38//     which case output_length will be set to the required size in bytes.
39//   output_length: size of output, if it's not 0.
40//
41//   returns: true on success.
42CONTENT_EXPORT bool GetFontTable(int fd, uint32_t table_tag, off_t offset,
43                                 uint8_t* output, size_t* output_length);
44
45};  // namespace content
46
47#endif  // CONTENT_PULIC_COMMON_CHILD_PROCESS_SANDBOX_SUPPORT_LINUX_H_
48