libc/src/__support/File/linux/file.h

   1 //===--- Linux specialization of the File data structure ------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "hdr/types/off_t.h"
  10 #include "src/__support/File/file.h"
  11 #include "src/__support/macros/config.h"
  12
  13 namespace LIBC_NAMESPACE_DECL {
  14
  15 FileIOResult linux_file_write(File *, const void *, size_t);
  16 FileIOResult linux_file_read(File *, void *, size_t);
  17 ErrorOr<off_t> linux_file_seek(File *, off_t, int);
  18 int linux_file_close(File *);
  19
  20 class LinuxFile : public File {
  21   int fd;
  22
  23 public:
  24   constexpr LinuxFile(int file_descriptor, uint8_t *buffer, size_t buffer_size,
  25                       int buffer_mode, bool owned, File::ModeFlags modeflags)
  26       : File(&linux_file_write, &linux_file_read, &linux_file_seek,
  27              &linux_file_close, buffer, buffer_size, buffer_mode, owned,
  28              modeflags),
  29         fd(file_descriptor) {}
  30
  31   int get_fd() const { return fd; }
  32 };
  33
  34 // Create a File object and associate it with a fd.
  35 ErrorOr<LinuxFile *> create_file_from_fd(int fd, const char *mode);
  36
  37 } // namespace LIBC_NAMESPACE_DECL