// Copyright 2012 The Chromium Authors
// 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 __GLIBC__.
#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-newlib build.
#if !defined(NACL_IO_IRT_EXT) && defined(__native_client__) && \
!defined(__GLIBC__) && !defined(__BIONIC__)
#include <dirent.h>
#include <errno.h>
#include <irt.h>
#include <irt_dev.h>
#include <sys/mman.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/log.h"
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(group, name) \
__typeof__(__libnacl_irt_##group.name) REAL(name);
// Assign the REAL function pointer.
#define ASSIGN_REAL_PTR(group, name) REAL(name) = __libnacl_irt_##group.name;
// Switch IRT's pointer to the REAL pointer
#define USE_REAL(group, name) \
__libnacl_irt_##group.name = (__typeof__(REAL(name)))REAL(name);
// Switch the IRT's pointer to the WRAP function
#define USE_WRAP(group, name) \
__libnacl_irt_##group.name = (__typeof__(REAL(name)))WRAP(name);
extern void __libnacl_irt_dev_filename_init(void);
extern void __libnacl_irt_dev_fdio_init(void);
extern struct nacl_irt_basic __libnacl_irt_basic;
extern struct nacl_irt_fdio __libnacl_irt_fdio;
extern struct nacl_irt_dev_fdio __libnacl_irt_dev_fdio;
extern struct nacl_irt_dev_filename __libnacl_irt_dev_filename;
extern struct nacl_irt_memory __libnacl_irt_memory;
// Create function pointers to the REAL implementation
#define EXPAND_SYMBOL_LIST_OPERATION(OP) \
OP(basic, exit); \
OP(fdio, close); \
OP(fdio, dup); \
OP(fdio, dup2); \
OP(fdio, read); \
OP(fdio, write); \
OP(fdio, seek); \
OP(fdio, fstat); \
OP(fdio, getdents); \
OP(dev_fdio, fchdir); \
OP(dev_fdio, fchmod); \
OP(dev_fdio, fsync); \
OP(dev_fdio, fdatasync); \
OP(dev_fdio, ftruncate); \
OP(dev_fdio, isatty); \
OP(dev_filename, open); \
OP(dev_filename, stat); \
OP(dev_filename, mkdir); \
OP(dev_filename, rmdir); \
OP(dev_filename, chdir); \
OP(dev_filename, getcwd); \
OP(dev_filename, unlink); \
OP(dev_filename, truncate); \
OP(dev_filename, lstat); \
OP(dev_filename, link); \
OP(dev_filename, rename); \
OP(dev_filename, symlink); \
OP(dev_filename, chmod); \
OP(dev_filename, access); \
OP(dev_filename, readlink); \
OP(dev_filename, utimes); \
OP(memory, mmap); \
OP(memory, munmap);
EXPAND_SYMBOL_LIST_OPERATION(DECLARE_REAL_PTR);
int WRAP(close)(int fd) {
ERRNO_RTN(ki_close(fd));
}
int WRAP(dup)(int fd, int* newfd) {
*newfd = ki_dup(fd);
ERRNO_RTN(*newfd);
}
int WRAP(dup2)(int fd, int newfd) {
newfd = ki_dup2(fd, newfd);
ERRNO_RTN(newfd);
}
void WRAP(exit)(int status) {
ki_exit(status);
}
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(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);
}
int WRAP(seek)(int fd, off_t offset, int whence, off_t* new_offset) {
*new_offset = ki_lseek(fd, offset, whence);
ERRNO_RTN(*new_offset);
}
int WRAP(fstat)(int fd, struct stat* buf) {
ERRNO_RTN(ki_fstat(fd, buf));
}
int WRAP(getdents)(int fd, dirent* buf, size_t count, size_t* nread) {
int rtn = ki_getdents(fd, buf, count);
RTN_ERRNO_IF(rtn < 0);
*nread = rtn;
return 0;
}
int WRAP(fchdir)(int fd) {
ERRNO_RTN(ki_fchdir(fd));
}
int WRAP(fchmod)(int fd, mode_t mode) {
ERRNO_RTN(ki_fchmod(fd, mode));
}
int WRAP(fsync)(int fd) {
ERRNO_RTN(ki_fsync(fd));
}
int WRAP(fdatasync)(int fd) {
ERRNO_RTN(ki_fdatasync(fd));
}
int WRAP(ftruncate)(int fd, off_t length) {
ERRNO_RTN(ki_ftruncate(fd, length));
}
int WRAP(isatty)(int fd, int* result) {
*result = ki_isatty(fd);
RTN_ERRNO_IF(*result == 0);
return 0;
}
int WRAP(mmap)(void** addr,
size_t length,
int prot,
int flags,
int fd,
off_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(stat)(const char* pathname, struct stat* buf) {
ERRNO_RTN(ki_stat(pathname, buf));
}
int WRAP(mkdir)(const char* pathname, mode_t mode) {
ERRNO_RTN(ki_mkdir(pathname, mode));
}
int WRAP(rmdir)(const char* pathname) {
ERRNO_RTN(ki_rmdir(pathname));
}
int WRAP(chdir)(const char* pathname) {
ERRNO_RTN(ki_chdir(pathname));
}
int WRAP(getcwd)(char* pathname, size_t len) {
char* rtn = ki_getcwd(pathname, len);
RTN_ERRNO_IF(NULL == rtn);
return 0;
}
int WRAP(unlink)(const char* pathname) {
ERRNO_RTN(ki_unlink(pathname));
}
int WRAP(truncate)(const char* pathname, off_t length) {
ERRNO_RTN(ki_truncate(pathname, length));
}
int WRAP(lstat)(const char* pathname, struct stat* buf) {
ERRNO_RTN(ki_lstat(pathname, buf));
}
int WRAP(link)(const char* pathname, const char* newpath) {
ERRNO_RTN(ki_link(pathname, newpath));
}
int WRAP(rename)(const char* pathname, const char* newpath) {
ERRNO_RTN(ki_rename(pathname, newpath));
}
int WRAP(symlink)(const char* pathname, const char* newpath) {
ERRNO_RTN(ki_symlink(pathname, newpath));
}
int WRAP(chmod)(const char* pathname, mode_t mode) {
ERRNO_RTN(ki_chmod(pathname, mode));
}
int WRAP(access)(const char* pathname, int amode) {
ERRNO_RTN(ki_access(pathname, amode));
}
int WRAP(readlink)(const char* pathname,
char* buf,
size_t count,
size_t* nread) {
int rtn = ki_readlink(pathname, buf, count);
RTN_ERRNO_IF(rtn < 0);
*nread = rtn;
return 0;
}
int WRAP(utimes)(const char* pathname, const struct timeval times[2]) {
ERRNO_RTN(ki_utimes(pathname, times));
}
static void assign_real_pointers() {
static bool assigned = false;
if (!assigned) {
__libnacl_irt_dev_filename_init();
__libnacl_irt_dev_fdio_init();
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) {
if (!REAL(exit))
assign_real_pointers();
REAL(exit)(status);
}
int _real_fstat(int fd, struct stat* buf) {
CHECK_REAL(fstat);
return REAL(fstat)(fd, buf);
}
int _real_isatty(int fd, int* result) {
CHECK_REAL(isatty);
// The real isatty function can be NULL (for example if we are running
// within chrome).
if (REAL(isatty) == NULL) {
*result = 0;
return ENOTTY;
}
return REAL(isatty)(fd, result);
}
int _real_getdents(int fd, void* nacl_buf, size_t nacl_count, size_t* nread) {
CHECK_REAL(getdents);
return REAL(getdents)(fd, static_cast<dirent*>(nacl_buf), nacl_count, nread);
}
int _real_lseek(int fd, off_t offset, int whence, off_t* new_offset) {
CHECK_REAL(seek);
return REAL(seek)(fd, offset, whence, new_offset);
}
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,
off_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) {
return ENOSYS;
}
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_rmdir(const char* pathname) {
CHECK_REAL(rmdir);
return REAL(rmdir)(pathname);
}
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) {
LOG_TRACE("kernel_wrap_init");
assign_real_pointers();
EXPAND_SYMBOL_LIST_OPERATION(USE_WRAP)
s_wrapped = true;
}
}
void kernel_wrap_uninit() {
if (s_wrapped) {
LOG_TRACE("kernel_wrap_uninit");
EXPAND_SYMBOL_LIST_OPERATION(USE_REAL)
s_wrapped = false;
}
}
EXTERN_C_END
#endif // defined(__native_client__) && !defined(__GLIBC__) ...
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