components/nacl/loader/nonsfi/irt_fdio.cc

   1 // Copyright 2014 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 #include <errno.h>
   6 #include <unistd.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9
  10 #include "base/logging.h"
  11 #include "components/nacl/loader/nonsfi/abi_conversion.h"
  12 #include "components/nacl/loader/nonsfi/irt_interfaces.h"
  13 #include "components/nacl/loader/nonsfi/irt_util.h"
  14 #include "native_client/src/trusted/service_runtime/include/sys/dirent.h"
  15 #include "native_client/src/trusted/service_runtime/include/sys/stat.h"
  16 #include "native_client/src/trusted/service_runtime/include/sys/unistd.h"
  17
  18 namespace nacl {
  19 namespace nonsfi {
  20 namespace {
  21
  22 int IrtClose(int fd) {
  23   return CheckError(close(fd));
  24 }
  25
  26 int IrtDup(int fd, int* newfd) {
  27   return CheckErrorWithResult(dup(fd), newfd);
  28 }
  29
  30 int IrtDup2(int fd, int newfd) {
  31   return CheckError(dup2(fd, newfd));
  32 }
  33
  34 int IrtRead(int fd, void* buf, size_t count, size_t* nread) {
  35   return CheckErrorWithResult(read(fd, buf, count), nread);
  36 }
  37
  38 int IrtWrite(int fd, const void* buf, size_t count, size_t* nwrote) {
  39   return CheckErrorWithResult(write(fd, buf, count), nwrote);
  40 }
  41
  42 int IrtSeek(int fd, nacl_abi_off_t offset, int whence,
  43             nacl_abi_off_t* new_offset) {
  44   return CheckErrorWithResult(lseek(fd, offset, whence), new_offset);
  45 }
  46
  47 int IrtFstat(int fd, struct nacl_abi_stat* st) {
  48   struct stat host_st;
  49   if (fstat(fd, &host_st))
  50     return errno;
  51
  52   StatToNaClAbiStat(host_st, st);
  53   return 0;
  54 }
  55
  56 int IrtGetDents(int fd, struct nacl_abi_dirent* buf, size_t count,
  57                 size_t* nread) {
  58   // Note: getdents() can return several directory entries in packed format.
  59   // So, here, because we need to convert the abi from host's to nacl's,
  60   // there is no straightforward way to ensure reading only entries which can
  61   // be fit to the buf after abi conversion actually.
  62   // TODO(https://code.google.com/p/nativeclient/issues/detail?id=3734):
  63   // Implement this method.
  64   return ENOSYS;
  65 }
  66
  67 }  // namespace
  68
  69 // For seek, fstat and getdents, their argument types should be nacl_abi_X,
  70 // rather than host type, such as off_t, struct stat or struct dirent.
  71 // However, the definition of nacl_irt_fdio uses host types, so here we need
  72 // to cast them.
  73 const nacl_irt_fdio kIrtFdIO = {
  74   IrtClose,
  75   IrtDup,
  76   IrtDup2,
  77   IrtRead,
  78   IrtWrite,
  79   reinterpret_cast<int(*)(int, off_t, int, off_t*)>(IrtSeek),
  80   reinterpret_cast<int(*)(int, struct stat*)>(IrtFstat),
  81   reinterpret_cast<int(*)(int, struct dirent*, size_t, size_t*)>(IrtGetDents),
  82 };
  83
  84 }  // namespace nonsfi
  85 }  // namespace nacl