Revert of [NaCl SDK] Remove support for bionic toolchain

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__.
+
+#include "nacl_io/kernel_wrap.h" // IRT_EXT is turned on in this header.
+
+// 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(NACL_IO_IRT_EXT) && defined(__native_client__) && \
+    defined(__BIONIC__)
+
+#include <alloca.h>
+#include <assert.h>
+#include <dirent.h>
+#include <errno.h>
+#include <irt_syscalls.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+#include "nacl_io/kernel_intercept.h"
+#include "nacl_io/kernel_wrap_real.h"
+#include "nacl_io/nacl_abi_types.h"
+#include "nacl_io/osmman.h"
+
+namespace {
+
+void stat_to_nacl_stat(const struct stat* buf, nacl_abi_stat* nacl_buf) {
+  memset(nacl_buf, 0, sizeof(struct nacl_abi_stat));
+  nacl_buf->nacl_abi_st_dev = buf->st_dev;
+  nacl_buf->nacl_abi_st_ino = buf->st_ino;
+  nacl_buf->nacl_abi_st_mode = buf->st_mode;
+  nacl_buf->nacl_abi_st_nlink = buf->st_nlink;
+  nacl_buf->nacl_abi_st_uid = buf->st_uid;
+  nacl_buf->nacl_abi_st_gid = buf->st_gid;
+  nacl_buf->nacl_abi_st_rdev = buf->st_rdev;
+  nacl_buf->nacl_abi_st_size = buf->st_size;
+  nacl_buf->nacl_abi_st_blksize = buf->st_blksize;
+  nacl_buf->nacl_abi_st_blocks = buf->st_blocks;
+  nacl_buf->nacl_abi_st_atime = buf->st_atime;
+  nacl_buf->nacl_abi_st_mtime = buf->st_mtime;
+  nacl_buf->nacl_abi_st_ctime = buf->st_ctime;
+}
+
+void nacl_stat_to_stat(const nacl_abi_stat* nacl_buf, struct stat* buf) {
+  memset(buf, 0, sizeof(struct stat));
+  buf->st_dev = nacl_buf->nacl_abi_st_dev;
+  buf->st_ino = nacl_buf->nacl_abi_st_ino;
+  buf->st_mode = nacl_buf->nacl_abi_st_mode;
+  buf->st_nlink = nacl_buf->nacl_abi_st_nlink;
+  buf->st_uid = nacl_buf->nacl_abi_st_uid;
+  buf->st_gid = nacl_buf->nacl_abi_st_gid;
+  buf->st_rdev = nacl_buf->nacl_abi_st_rdev;
+  buf->st_size = nacl_buf->nacl_abi_st_size;
+  buf->st_blksize = nacl_buf->nacl_abi_st_blksize;
+  buf->st_blocks = nacl_buf->nacl_abi_st_blocks;
+  buf->st_atime = nacl_buf->nacl_abi_st_atime;
+  buf->st_mtime = nacl_buf->nacl_abi_st_mtime;
+  buf->st_ctime = nacl_buf->nacl_abi_st_ctime;
+}
+
+}  // namespace
+
+static const int d_name_shift = offsetof (dirent, d_name) -
+  offsetof (struct nacl_abi_dirent, nacl_abi_d_name);
+
+EXTERN_C_BEGIN
+
+// Macro to get the REAL function pointer
+#define REAL(name) __nacl_irt_##name##_real
+
+// Macro to get the WRAP function
+#define WRAP(name) __nacl_irt_##name##_wrap
+
+// Declare REAL function pointer.
+#define DECLARE_REAL_PTR(name) typeof(__nacl_irt_##name) REAL(name);
+
+// Assign the REAL function pointer.
+#define ASSIGN_REAL_PTR(name) REAL(name) = __nacl_irt_##name;
+
+// Switch IRT's pointer to the REAL pointer
+#define USE_REAL(name) __nacl_irt_##name = (typeof(__nacl_irt_##name))REAL(name)
+
+// Switch IRT's pointer to the WRAP function
+#define USE_WRAP(name) __nacl_irt_##name = (typeof(__nacl_irt_##name))WRAP(name)
+
+#define EXPAND_SYMBOL_LIST_OPERATION(OP) \
+  OP(chdir);                             \
+  OP(close);                             \
+  OP(dup);                               \
+  OP(dup2);                              \
+  OP(exit);                              \
+  OP(fchdir);                            \
+  OP(fchmod);                            \
+  OP(fdatasync);                         \
+  OP(fstat);                             \
+  OP(fsync);                             \
+  OP(getcwd);                            \
+  OP(getdents);                          \
+  OP(isatty);                            \
+  OP(lstat);                             \
+  OP(mkdir);                             \
+  OP(mmap);                              \
+  OP(munmap);                            \
+  OP(open);                              \
+  OP(open_resource);                     \
+  OP(poll);                              \
+  OP(read);                              \
+  OP(readlink);                          \
+  OP(rmdir);                             \
+  OP(seek);                              \
+  OP(stat);                              \
+  OP(truncate);                          \
+  OP(write);
+
+EXPAND_SYMBOL_LIST_OPERATION(DECLARE_REAL_PTR);
+
+int WRAP(chdir)(const char* pathname) {
+  ERRNO_RTN(ki_chdir(pathname));
+}
+
+int WRAP(close)(int fd) {
+  ERRNO_RTN(ki_close(fd));
+}
+
+int WRAP(dup)(int fd, int* newfd) NOTHROW {
+  *newfd = ki_dup(fd);
+  ERRNO_RTN(*newfd);
+}
+
+int WRAP(dup2)(int fd, int newfd) NOTHROW {
+  ERRNO_RTN(ki_dup2(fd, newfd));
+}
+
+void WRAP(exit)(int status) {
+  ki_exit(status);
+}
+
+int WRAP(fchdir)(int fd) NOTHROW {
+  ERRNO_RTN(ki_fchdir(fd));
+}
+
+int WRAP(fchmod)(int fd, mode_t mode) NOTHROW {
+  ERRNO_RTN(ki_fchmod(fd, mode));
+}
+
+int WRAP(fdatasync)(int fd) NOTHROW {
+  ERRNO_RTN(ki_fdatasync(fd));
+}
+
+int WRAP(fstat)(int fd, struct nacl_abi_stat* nacl_buf) {
+  struct stat buf;
+  memset(&buf, 0, sizeof(struct stat));
+  int res = ki_fstat(fd, &buf);
+  RTN_ERRNO_IF(res < 0);
+  stat_to_nacl_stat(&buf, nacl_buf);
+  return 0;
+}
+
+int WRAP(fsync)(int fd) NOTHROW {
+  ERRNO_RTN(ki_fsync(fd));
+}
+
+int WRAP(getcwd)(char* buf, size_t size) {
+  RTN_ERRNO_IF(ki_getcwd(buf, size) == NULL);
+  return 0;
+}
+
+int WRAP(getdents)(int fd, dirent* nacl_buf, size_t nacl_count, size_t* nread) {
+  int nacl_offset = 0;
+  // "buf" contains dirent(s); "nacl_buf" contains nacl_abi_dirent(s).
+  // nacl_abi_dirent(s) are smaller than dirent(s), so nacl_count bytes buffer
+  // is enough
+  char* buf = (char*)alloca(nacl_count);
+  int offset = 0;
+  int count;
+
+  count = ki_getdents(fd, (dirent*)buf, nacl_count);
+  RTN_ERRNO_IF(count < 0);
+
+  while (offset < count) {
+    dirent* d = (dirent*)(buf + offset);
+    nacl_abi_dirent* nacl_d = (nacl_abi_dirent*)((char*)nacl_buf + nacl_offset);
+    nacl_d->nacl_abi_d_ino = d->d_ino;
+    nacl_d->nacl_abi_d_off = d->d_off;
+    nacl_d->nacl_abi_d_reclen = d->d_reclen - d_name_shift;
+    size_t d_name_len = d->d_reclen - offsetof(dirent, d_name);
+    memcpy(nacl_d->nacl_abi_d_name, d->d_name, d_name_len);
+
+    offset += d->d_reclen;
+    nacl_offset += nacl_d->nacl_abi_d_reclen;
+  }
+
+  *nread = nacl_offset;
+  return 0;
+}
+
+int WRAP(isatty)(int fd, int* result) {
+  *result = ki_isatty(fd);
+  RTN_ERRNO_IF(*result == 0);
+  return 0;
+}
+
+int WRAP(lstat)(const char* path, struct nacl_abi_stat* nacl_buf) {
+  struct stat buf;
+  memset(&buf, 0, sizeof(struct stat));
+  int res = ki_lstat(path, &buf);
+  RTN_ERRNO_IF(res < 0);
+  stat_to_nacl_stat(&buf, nacl_buf);
+  return 0;
+}
+
+int WRAP(mkdir)(const char* pathname, mode_t mode) {
+  ERRNO_RTN(ki_mkdir(pathname, mode));
+}
+
+int WRAP(mmap)(void** addr,
+               size_t length,
+               int prot,
+               int flags,
+               int fd,
+               int64_t offset) {
+  if (flags & MAP_ANONYMOUS)
+    return REAL(mmap)(addr, length, prot, flags, fd, offset);
+
+  *addr = ki_mmap(*addr, length, prot, flags, fd, offset);
+  RTN_ERRNO_IF(*addr == (void*)-1)
+  return 0;
+}
+
+int WRAP(munmap)(void* addr, size_t length) {
+  // Always let the real munmap run on the address range. It is not an error if
+  // there are no mapped pages in that range.
+  ki_munmap(addr, length);
+  return REAL(munmap)(addr, length);
+}
+
+int WRAP(open)(const char* pathname, int oflag, mode_t mode, int* newfd) {
+  *newfd = ki_open(pathname, oflag, mode);
+  ERRNO_RTN(*newfd);
+}
+
+int WRAP(open_resource)(const char* file, int* fd) {
+  *fd = ki_open_resource(file);
+  ERRNO_RTN(*fd);
+}
+
+int WRAP(poll)(struct pollfd* fds, nfds_t nfds, int timeout, int* count) {
+  *count = ki_poll(fds, nfds, timeout);
+  ERRNO_RTN(*count);
+}
+
+int WRAP(read)(int fd, void* buf, size_t count, size_t* nread) {
+  ssize_t signed_nread = ki_read(fd, buf, count);
+  *nread = static_cast<size_t>(signed_nread);
+  ERRNO_RTN(signed_nread);
+}
+
+int WRAP(readlink)(const char* path, char* buf, size_t count, size_t* nread) {
+  ssize_t signed_nread = ki_readlink(path, buf, count);
+  *nread = static_cast<size_t>(signed_nread);
+  ERRNO_RTN(signed_nread);
+}
+
+int WRAP(rmdir)(const char* pathname) {
+  ERRNO_RTN(ki_rmdir(pathname));
+}
+
+int WRAP(seek)(int fd, off64_t offset, int whence, int64_t* new_offset) {
+  *new_offset = ki_lseek(fd, offset, whence);
+  ERRNO_RTN(*new_offset);
+}
+
+int WRAP(select)(int nfds,
+                 fd_set* readfds,
+                 fd_set* writefds,
+                 fd_set* exceptfds,
+                 struct timeval* timeout,
+                 int* count) {
+  *count = ki_select(nfds, readfds, writefds, exceptfds, timeout);
+  ERRNO_RTN(*count);
+}
+
+int WRAP(stat)(const char* pathname, struct nacl_abi_stat* nacl_buf) {
+  struct stat buf;
+  memset(&buf, 0, sizeof(struct stat));
+  int res = ki_stat(pathname, &buf);
+  RTN_ERRNO_IF(res < 0);
+  stat_to_nacl_stat(&buf, nacl_buf);
+  return 0;
+}
+
+int WRAP(truncate)(const char* name, int64_t len) {
+  ERRNO_RTN(ki_truncate(name, len));
+}
+
+int WRAP(write)(int fd, const void* buf, size_t count, size_t* nwrote) {
+  ssize_t signed_nwrote = ki_write(fd, buf, count);
+  *nwrote = static_cast<size_t>(signed_nwrote);
+  ERRNO_RTN(signed_nwrote);
+}
+
+static void assign_real_pointers() {
+  static bool assigned = false;
+  if (!assigned) {
+    EXPAND_SYMBOL_LIST_OPERATION(ASSIGN_REAL_PTR)
+    assigned = true;
+  }
+}
+
+#define CHECK_REAL(func) \
+  if (!REAL(func)) {          \
+    assign_real_pointers();   \
+    if (!REAL(func))          \
+      return ENOSYS;          \
+  }
+
+// "real" functions, i.e. the unwrapped original functions.
+
+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);
+  return REAL(fchdir)(fd);
+}
+
+int _real_fchmod(int fd, mode_t mode) {
+  CHECK_REAL(fchmod);
+  return REAL(fchmod)(fd, mode);
+}
+
+int _real_fdatasync(int fd) {
+  CHECK_REAL(fdatasync);
+  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);
+}
+
+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);
+  int err = REAL(getdents)(fd, (dirent*)nacl_buf, count, &nacl_nread);
+  if (err)
+    return err;
+
+  while (nacl_offset < nacl_nread) {
+    dirent* d = (dirent*)((char*)buf + offset);
+    nacl_abi_dirent* nacl_d = (nacl_abi_dirent*)(nacl_buf + nacl_offset);
+    d->d_ino = nacl_d->nacl_abi_d_ino;
+    d->d_off = nacl_d->nacl_abi_d_off;
+    d->d_reclen = nacl_d->nacl_abi_d_reclen + d_name_shift;
+    size_t d_name_len =
+        nacl_d->nacl_abi_d_reclen - offsetof(nacl_abi_dirent, nacl_abi_d_name);
+    memcpy(d->d_name, nacl_d->nacl_abi_d_name, d_name_len);
+
+    offset += d->d_reclen;
+    offset += nacl_d->nacl_abi_d_reclen;
+  }
+
+  *nread = offset;
+  return 0;
+}
+
+int _real_isatty(int fd, int* result) {
+  *result = isatty(fd);
+  return *result ? 0 : -1;
+}
+
+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(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);
+  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);
+  return REAL(open)(pathname, oflag, mode, newfd);
+}
+
+int _real_open_resource(const char* file, int* fd) {
+  CHECK_REAL(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);
+  return REAL(readlink)(path, buf, count, nread);
+}
+
+int _real_rmdir(const char* pathname) {
+  CHECK_REAL(rmdir);
+  return REAL(rmdir)(pathname);
+}
+
+int _real_truncate(const char* pathname, int64_t len) {
+  CHECK_REAL(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(getcwd);
+  return REAL(getcwd)(pathname, len);
+}
+
+static bool s_wrapped = false;
+
+void kernel_wrap_init() {
+  if (!s_wrapped) {
+    assign_real_pointers();
+    EXPAND_SYMBOL_LIST_OPERATION(USE_WRAP)
+    s_wrapped = true;
+  }
+}
+
+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__)