[NaCl SDK] nacl_io: handle null irt function pointers

native_client_sdk/src/libraries/nacl_io/kernel_wrap_bionic.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sys/types.h>  // Include something that will define __BIONIC__.
 
 // The entire file is wrapped in this #if. We do this so this .cc file can be
 // compiled, even on a non-bionic build.
 
 #if defined(__native_client__) && defined(__BIONIC__)
@@ skipping 340 matching lines @@
 int _real_close(int fd) {
   CHECK_REAL(close);
   return REAL(close)(fd);
 }
 
 void _real_exit(int status) {
   REAL(exit)(status);
 }
 
 int _real_fchdir(int fd) {
   CHECK_REAL(fchdir);

[binji, 2014/09/17 23:30:45]

here too?

   return REAL(fchdir)(fd);
 }
 
 int _real_fchmod(int fd, mode_t mode) {
   CHECK_REAL(fchmod);

[binji, 2014/09/17 23:30:45]

here too?

   return REAL(fchmod)(fd, mode);
 }
 
 int _real_fdatasync(int fd) {
   CHECK_REAL(fdatasync);

[binji, 2014/09/17 23:30:45]

here too?

   return REAL(fdatasync)(fd);
 }
 
 int _real_fstat(int fd, struct stat* buf) {
   struct nacl_abi_stat st;
   CHECK_REAL(fstat);
 
   int err = REAL(fstat)(fd, (struct stat*)&st);
   if (err) {
     errno = err;
     return -1;
   }
 
   nacl_stat_to_stat(&st, buf);
   return 0;
 }
 
 int _real_fsync(int fd) {
   CHECK_REAL(fsync);
   return REAL(fsync)(fd);

[binji, 2014/09/17 23:30:45]

here too?

 }
 
 int _real_getdents(int fd, void* buf, size_t count, size_t* nread) {
   // "buf" contains dirent(s); "nacl_buf" contains nacl_abi_dirent(s).
   // See WRAP(getdents) above.
   char* nacl_buf = (char*)alloca(count);
   size_t offset = 0;
   size_t nacl_offset = 0;
   size_t nacl_nread;
   CHECK_REAL(getdents);
@@ skipping 27 matching lines @@
 int _real_lseek(int fd, int64_t offset, int whence, int64_t* new_offset) {
   CHECK_REAL(seek);
   nacl_abi_off_t nacl_new_offs;
   int ret = REAL(seek)(fd, offset, whence, &nacl_new_offs);
   *new_offset = static_cast<off_t>(nacl_new_offs);
   return ret;
 }
 
 int _real_lstat(const char* path, struct stat* buf) {
   struct nacl_abi_stat st;
-  CHECK_REAL(fstat);
+  CHECK_REAL_NOSYS(lstat);
 
   int err = REAL(lstat)(path, (struct stat*)&st);
   if (err) {
     errno = err;
     return -1;
   }
 
   nacl_stat_to_stat(&st, buf);
   return 0;
 }
 
 int _real_mkdir(const char* pathname, mode_t mode) {
-  CHECK_REAL(mkdir);
+  CHECK_REAL_NOSYS(mkdir);
   return REAL(mkdir)(pathname, mode);
 }
 
 int _real_mmap(void** addr,
                size_t length,
                int prot,
                int flags,
                int fd,
                int64_t offset) {
   CHECK_REAL(mmap);
   return REAL(mmap)(addr, length, prot, flags, fd, offset);
 }
 
 int _real_munmap(void* addr, size_t length) {
   CHECK_REAL(munmap);
   return REAL(munmap)(addr, length);
 }
 
 int _real_open(const char* pathname, int oflag, mode_t mode, int* newfd) {
-  CHECK_REAL(open);
+  CHECK_REAL_NOSYS(open);
   return REAL(open)(pathname, oflag, mode, newfd);
 }
 
 int _real_open_resource(const char* file, int* fd) {
-  CHECK_REAL(open_resource);
+  CHECK_REAL_NOSYS(open_resource);
   return REAL(open_resource)(file, fd);
 }
 
 int _real_read(int fd, void* buf, size_t count, size_t* nread) {
   CHECK_REAL(read);
   return REAL(read)(fd, buf, count, nread);
 }
 
 int _real_readlink(const char* path, char* buf, size_t count, size_t* nread) {
-  CHECK_REAL(readlink);
+  CHECK_REAL_NOSYS(readlink);
   return REAL(readlink)(path, buf, count, nread);
 }
 
 int _real_rmdir(const char* pathname) {
-  CHECK_REAL(rmdir);
+  CHECK_REAL_NOSYS(rmdir);
   return REAL(rmdir)(pathname);
 }
 
 int _real_truncate(const char* pathname, int64_t len) {
-  CHECK_REAL(truncate);
+  CHECK_REAL_NOSYS(truncate);
   return REAL(truncate)(pathname, len);
 }
 
 int _real_write(int fd, const void* buf, size_t count, size_t* nwrote) {
   CHECK_REAL(write);
   return REAL(write)(fd, buf, count, nwrote);
 }
 
 int _real_getcwd(char* pathname, size_t len) {
   CHECK_REAL_NOSYS(getcwd);
@@ skipping 13 matching lines @@
 void kernel_wrap_uninit() {
   if (s_wrapped) {
     EXPAND_SYMBOL_LIST_OPERATION(USE_REAL)
     s_wrapped = false;
   }
 }
 
 EXTERN_C_END
 
 #endif  // defined(__native_client__) && defined(__BIONIC__)