| // 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 __GLIBC__. |
| |
| // 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(__native_client__) && !defined(__GLIBC__) |
| |
| #include "nacl_io/kernel_wrap.h" |
| |
| #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" |
| |
| 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 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(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_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) { |
| return (ki_close(fd) < 0) ? errno : 0; |
| } |
| |
| int WRAP(dup)(int fd, int* newfd) { |
| *newfd = ki_dup(fd); |
| return (*newfd < 0) ? errno : 0; |
| } |
| |
| int WRAP(dup2)(int fd, int newfd) { |
| newfd = ki_dup2(fd, newfd); |
| return (newfd < 0) ? errno : 0; |
| } |
| |
| 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); |
| return (signed_nread < 0) ? errno : 0; |
| } |
| |
| 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); |
| return (signed_nwrote < 0) ? errno : 0; |
| } |
| |
| int WRAP(seek)(int fd, off_t offset, int whence, off_t* new_offset) { |
| *new_offset = ki_lseek(fd, offset, whence); |
| return (*new_offset < 0) ? errno : 0; |
| } |
| |
| int WRAP(fstat)(int fd, struct stat* buf) { |
| return (ki_fstat(fd, buf) < 0) ? errno : 0; |
| } |
| |
| int WRAP(getdents)(int fd, dirent* buf, size_t count, size_t* nread) { |
| int rtn = ki_getdents(fd, buf, count); |
| if (rtn < 0) |
| return errno; |
| *nread = rtn; |
| return 0; |
| } |
| |
| int WRAP(fchdir)(int fd) { |
| return (ki_fchdir(fd) < 0) ? errno : 0; |
| } |
| |
| int WRAP(fchmod)(int fd, mode_t mode) { |
| return (ki_fchmod(fd, mode) < 0) ? errno : 0; |
| } |
| |
| int WRAP(fsync)(int fd) { |
| return (ki_fsync(fd) < 0) ? errno : 0; |
| } |
| |
| int WRAP(fdatasync)(int fd) { |
| return (ki_fdatasync(fd) < 0) ? errno : 0; |
| } |
| |
| int WRAP(ftruncate)(int fd, off_t length) { |
| return (ki_ftruncate(fd, length) < 0) ? errno : 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); |
| return *addr == (void*)-1 ? errno : 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 cmode, int* newfd) { |
| *newfd = ki_open(pathname, oflag); |
| return (*newfd < 0) ? errno : 0; |
| } |
| |
| int WRAP(stat)(const char* pathname, struct stat* buf) { |
| return (ki_stat(pathname, buf) < 0) ? errno : 0; |
| } |
| |
| int WRAP(mkdir)(const char* pathname, mode_t mode) { |
| return (ki_mkdir(pathname, mode) < 0) ? errno : 0; |
| } |
| |
| int WRAP(rmdir)(const char* pathname) { |
| return (ki_rmdir(pathname) < 0) ? errno : 0; |
| } |
| |
| int WRAP(chdir)(const char* pathname) { |
| return (ki_chdir(pathname) < 0) ? errno : 0; |
| } |
| |
| int WRAP(getcwd)(char* pathname, size_t len) { |
| char* rtn = ki_getcwd(pathname, len); |
| if (NULL == rtn) |
| return errno; |
| return 0; |
| } |
| |
| int WRAP(unlink)(const char* pathname) { |
| return (ki_unlink(pathname) < 0) ? errno : 0; |
| } |
| |
| int WRAP(truncate)(const char* pathname, off_t length) { |
| return (ki_truncate(pathname, length) < 0) ? errno : 0; |
| } |
| |
| int WRAP(lstat)(const char* pathname, struct stat* buf) { |
| return (ki_lstat(pathname, buf) < 0) ? errno : 0; |
| } |
| |
| int WRAP(link)(const char* pathname, const char* newpath) { |
| return (ki_link(pathname, newpath) < 0) ? errno : 0; |
| } |
| |
| int WRAP(rename)(const char* pathname, const char* newpath) { |
| return (ki_rename(pathname, newpath) < 0) ? errno : 0; |
| } |
| |
| int WRAP(symlink)(const char* pathname, const char* newpath) { |
| return (ki_symlink(pathname, newpath) < 0) ? errno : 0; |
| } |
| |
| int WRAP(chmod)(const char* pathname, mode_t mode) { |
| return (ki_chmod(pathname, mode) < 0) ? errno : 0; |
| } |
| |
| int WRAP(access)(const char* pathname, int amode) { |
| return (ki_access(pathname, amode) < 0) ? errno : 0; |
| } |
| |
| int WRAP(readlink)(const char* pathname, char *buf, |
| size_t count, size_t *nread) { |
| int rtn = ki_readlink(pathname, buf, count); |
| if (rtn < 0) |
| return errno; |
| *nread = rtn; |
| return 0; |
| } |
| |
| int WRAP(utimes)(const char* pathname, const struct timeval times[2]) { |
| return (ki_utimes(pathname, times) < 0) ? errno : 0; |
| } |
| |
| static void assign_real_pointers() { |
| static bool assigned = false; |
| if (!assigned) { |
| __libnacl_irt_dev_filename_init(); |
| EXPAND_SYMBOL_LIST_OPERATION(ASSIGN_REAL_PTR) |
| assigned = true; |
| } |
| } |
| |
| #define CHECK_REAL(func) \ |
| if (!REAL(func)) \ |
| assign_real_pointers(); |
| |
| // "real" functions, i.e. the unwrapped original functions. |
| |
| int _real_close(int fd) { |
| CHECK_REAL(close); |
| return REAL(close)(fd); |
| } |
| |
| int _real_fstat(int fd, struct stat* buf) { |
| CHECK_REAL(fstat); |
| return REAL(fstat)(fd, buf); |
| } |
| |
| 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) { |
| return ENOSYS; |
| } |
| |
| 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 cmode, int* newfd) { |
| CHECK_REAL(open); |
| return REAL(open)(pathname, oflag, cmode, 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) { |
| return ENOSYS; |
| } |
| |
| int _real_write(int fd, const void* buf, size_t count, size_t* nwrote) { |
| CHECK_REAL(write); |
| return REAL(write)(fd, buf, count, nwrote); |
| } |
| |
| 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(__GLIBC__) |