content/public/common/child_process_sandbox_support_linux.h

   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
  13 namespace 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.)
  22 CONTENT_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.
  29 CONTENT_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: the table in *big-endian* format, or 0 for the whole font file.
  35 //   output: a buffer of size output_length that gets the data.  can be 0, in
  36 //     which case output_length will be set to the required size in bytes.
  37 //   output_length: size of output, if it's not 0.
  38 //
  39 //   returns: true on success.
  40 CONTENT_EXPORT bool GetFontTable(int fd, uint32_t table, uint8_t* output,
  41                                  size_t* output_length);
  42
  43 };  // namespace content
  44
  45 #endif  // CONTENT_PULIC_COMMON_CHILD_PROCESS_SANDBOX_SUPPORT_LINUX_H_