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Diffstat (limited to 'src/3rdparty/v8/src/d8-posix.cc')
| -rw-r--r-- | src/3rdparty/v8/src/d8-posix.cc | 688 |
1 files changed, 0 insertions, 688 deletions
diff --git a/src/3rdparty/v8/src/d8-posix.cc b/src/3rdparty/v8/src/d8-posix.cc deleted file mode 100644 index 8a278e4..0000000 --- a/src/3rdparty/v8/src/d8-posix.cc +++ /dev/null @@ -1,688 +0,0 @@ -// Copyright 2009 the V8 project authors. All rights reserved. -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following -// disclaimer in the documentation and/or other materials provided -// with the distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived -// from this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - - -#include <stdlib.h> -#include <errno.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/time.h> -#include <time.h> -#include <unistd.h> -#include <fcntl.h> -#include <sys/wait.h> -#include <signal.h> - - -#include "d8.h" -#include "d8-debug.h" -#include "debug.h" - - -namespace v8 { - - -// If the buffer ends in the middle of a UTF-8 sequence then we return -// the length of the string up to but not including the incomplete UTF-8 -// sequence. If the buffer ends with a valid UTF-8 sequence then we -// return the whole buffer. -static int LengthWithoutIncompleteUtf8(char* buffer, int len) { - int answer = len; - // 1-byte encoding. - static const int kUtf8SingleByteMask = 0x80; - static const int kUtf8SingleByteValue = 0x00; - // 2-byte encoding. - static const int kUtf8TwoByteMask = 0xe0; - static const int kUtf8TwoByteValue = 0xc0; - // 3-byte encoding. - static const int kUtf8ThreeByteMask = 0xf0; - static const int kUtf8ThreeByteValue = 0xe0; - // 4-byte encoding. - static const int kUtf8FourByteMask = 0xf8; - static const int kUtf8FourByteValue = 0xf0; - // Subsequent bytes of a multi-byte encoding. - static const int kMultiByteMask = 0xc0; - static const int kMultiByteValue = 0x80; - int multi_byte_bytes_seen = 0; - while (answer > 0) { - int c = buffer[answer - 1]; - // Ends in valid single-byte sequence? - if ((c & kUtf8SingleByteMask) == kUtf8SingleByteValue) return answer; - // Ends in one or more subsequent bytes of a multi-byte value? - if ((c & kMultiByteMask) == kMultiByteValue) { - multi_byte_bytes_seen++; - answer--; - } else { - if ((c & kUtf8TwoByteMask) == kUtf8TwoByteValue) { - if (multi_byte_bytes_seen >= 1) { - return answer + 2; - } - return answer - 1; - } else if ((c & kUtf8ThreeByteMask) == kUtf8ThreeByteValue) { - if (multi_byte_bytes_seen >= 2) { - return answer + 3; - } - return answer - 1; - } else if ((c & kUtf8FourByteMask) == kUtf8FourByteValue) { - if (multi_byte_bytes_seen >= 3) { - return answer + 4; - } - return answer - 1; - } else { - return answer; // Malformed UTF-8. - } - } - } - return 0; -} - - -// Suspends the thread until there is data available from the child process. -// Returns false on timeout, true on data ready. -static bool WaitOnFD(int fd, - int read_timeout, - int total_timeout, - struct timeval& start_time) { - fd_set readfds, writefds, exceptfds; - struct timeval timeout; - int gone = 0; - if (total_timeout != -1) { - struct timeval time_now; - gettimeofday(&time_now, NULL); - int seconds = time_now.tv_sec - start_time.tv_sec; - gone = seconds * 1000 + (time_now.tv_usec - start_time.tv_usec) / 1000; - if (gone >= total_timeout) return false; - } - FD_ZERO(&readfds); - FD_ZERO(&writefds); - FD_ZERO(&exceptfds); - FD_SET(fd, &readfds); - FD_SET(fd, &exceptfds); - if (read_timeout == -1 || - (total_timeout != -1 && total_timeout - gone < read_timeout)) { - read_timeout = total_timeout - gone; - } - timeout.tv_usec = (read_timeout % 1000) * 1000; - timeout.tv_sec = read_timeout / 1000; - int number_of_fds_ready = select(fd + 1, - &readfds, - &writefds, - &exceptfds, - read_timeout != -1 ? &timeout : NULL); - return number_of_fds_ready == 1; -} - - -// Checks whether we ran out of time on the timeout. Returns true if we ran out -// of time, false if we still have time. -static bool TimeIsOut(const struct timeval& start_time, const int& total_time) { - if (total_time == -1) return false; - struct timeval time_now; - gettimeofday(&time_now, NULL); - // Careful about overflow. - int seconds = time_now.tv_sec - start_time.tv_sec; - if (seconds > 100) { - if (seconds * 1000 > total_time) return true; - return false; - } - int useconds = time_now.tv_usec - start_time.tv_usec; - if (seconds * 1000000 + useconds > total_time * 1000) { - return true; - } - return false; -} - - -// A utility class that does a non-hanging waitpid on the child process if we -// bail out of the System() function early. If you don't ever do a waitpid on -// a subprocess then it turns into one of those annoying 'zombie processes'. -class ZombieProtector { - public: - explicit ZombieProtector(int pid): pid_(pid) { } - ~ZombieProtector() { if (pid_ != 0) waitpid(pid_, NULL, 0); } - void ChildIsDeadNow() { pid_ = 0; } - private: - int pid_; -}; - - -// A utility class that closes a file descriptor when it goes out of scope. -class OpenFDCloser { - public: - explicit OpenFDCloser(int fd): fd_(fd) { } - ~OpenFDCloser() { close(fd_); } - private: - int fd_; -}; - - -// A utility class that takes the array of command arguments and puts then in an -// array of new[]ed UTF-8 C strings. Deallocates them again when it goes out of -// scope. -class ExecArgs { - public: - ExecArgs() { - exec_args_[0] = NULL; - } - bool Init(Handle<Value> arg0, Handle<Array> command_args) { - String::Utf8Value prog(arg0); - if (*prog == NULL) { - const char* message = - "os.system(): String conversion of program name failed"; - ThrowException(String::New(message)); - return false; - } - int len = prog.length() + 3; - char* c_arg = new char[len]; - snprintf(c_arg, len, "%s", *prog); - exec_args_[0] = c_arg; - int i = 1; - for (unsigned j = 0; j < command_args->Length(); i++, j++) { - Handle<Value> arg(command_args->Get(Integer::New(j))); - String::Utf8Value utf8_arg(arg); - if (*utf8_arg == NULL) { - exec_args_[i] = NULL; // Consistent state for destructor. - const char* message = - "os.system(): String conversion of argument failed."; - ThrowException(String::New(message)); - return false; - } - int len = utf8_arg.length() + 1; - char* c_arg = new char[len]; - snprintf(c_arg, len, "%s", *utf8_arg); - exec_args_[i] = c_arg; - } - exec_args_[i] = NULL; - return true; - } - ~ExecArgs() { - for (unsigned i = 0; i < kMaxArgs; i++) { - if (exec_args_[i] == NULL) { - return; - } - delete [] exec_args_[i]; - exec_args_[i] = 0; - } - } - static const unsigned kMaxArgs = 1000; - char** arg_array() { return exec_args_; } - char* arg0() { return exec_args_[0]; } - - private: - char* exec_args_[kMaxArgs + 1]; -}; - - -// Gets the optional timeouts from the arguments to the system() call. -static bool GetTimeouts(const Arguments& args, - int* read_timeout, - int* total_timeout) { - if (args.Length() > 3) { - if (args[3]->IsNumber()) { - *total_timeout = args[3]->Int32Value(); - } else { - ThrowException(String::New("system: Argument 4 must be a number")); - return false; - } - } - if (args.Length() > 2) { - if (args[2]->IsNumber()) { - *read_timeout = args[2]->Int32Value(); - } else { - ThrowException(String::New("system: Argument 3 must be a number")); - return false; - } - } - return true; -} - - -static const int kReadFD = 0; -static const int kWriteFD = 1; - - -// This is run in the child process after fork() but before exec(). It normally -// ends with the child process being replaced with the desired child program. -// It only returns if an error occurred. -static void ExecSubprocess(int* exec_error_fds, - int* stdout_fds, - ExecArgs& exec_args) { - close(exec_error_fds[kReadFD]); // Don't need this in the child. - close(stdout_fds[kReadFD]); // Don't need this in the child. - close(1); // Close stdout. - dup2(stdout_fds[kWriteFD], 1); // Dup pipe fd to stdout. - close(stdout_fds[kWriteFD]); // Don't need the original fd now. - fcntl(exec_error_fds[kWriteFD], F_SETFD, FD_CLOEXEC); - execvp(exec_args.arg0(), exec_args.arg_array()); - // Only get here if the exec failed. Write errno to the parent to tell - // them it went wrong. If it went well the pipe is closed. - int err = errno; - int bytes_written; - do { - bytes_written = write(exec_error_fds[kWriteFD], &err, sizeof(err)); - } while (bytes_written == -1 && errno == EINTR); - // Return (and exit child process). -} - - -// Runs in the parent process. Checks that the child was able to exec (closing -// the file desriptor), or reports an error if it failed. -static bool ChildLaunchedOK(int* exec_error_fds) { - int bytes_read; - int err; - do { - bytes_read = read(exec_error_fds[kReadFD], &err, sizeof(err)); - } while (bytes_read == -1 && errno == EINTR); - if (bytes_read != 0) { - ThrowException(String::New(strerror(err))); - return false; - } - return true; -} - - -// Accumulates the output from the child in a string handle. Returns true if it -// succeeded or false if an exception was thrown. -static Handle<Value> GetStdout(int child_fd, - struct timeval& start_time, - int read_timeout, - int total_timeout) { - Handle<String> accumulator = String::Empty(); - - int fullness = 0; - static const int kStdoutReadBufferSize = 4096; - char buffer[kStdoutReadBufferSize]; - - if (fcntl(child_fd, F_SETFL, O_NONBLOCK) != 0) { - return ThrowException(String::New(strerror(errno))); - } - - int bytes_read; - do { - bytes_read = read(child_fd, - buffer + fullness, - kStdoutReadBufferSize - fullness); - if (bytes_read == -1) { - if (errno == EAGAIN) { - if (!WaitOnFD(child_fd, - read_timeout, - total_timeout, - start_time) || - (TimeIsOut(start_time, total_timeout))) { - return ThrowException(String::New("Timed out waiting for output")); - } - continue; - } else if (errno == EINTR) { - continue; - } else { - break; - } - } - if (bytes_read + fullness > 0) { - int length = bytes_read == 0 ? - bytes_read + fullness : - LengthWithoutIncompleteUtf8(buffer, bytes_read + fullness); - Handle<String> addition = String::New(buffer, length); - accumulator = String::Concat(accumulator, addition); - fullness = bytes_read + fullness - length; - memcpy(buffer, buffer + length, fullness); - } - } while (bytes_read != 0); - return accumulator; -} - - -// Modern Linux has the waitid call, which is like waitpid, but more useful -// if you want a timeout. If we don't have waitid we can't limit the time -// waiting for the process to exit without losing the information about -// whether it exited normally. In the common case this doesn't matter because -// we don't get here before the child has closed stdout and most programs don't -// do that before they exit. -// -// We're disabling usage of waitid in Mac OS X because it doens't work for us: -// a parent process hangs on waiting while a child process is already a zombie. -// See http://code.google.com/p/v8/issues/detail?id=401. -#if defined(WNOWAIT) && !defined(ANDROID) && !defined(__APPLE__) \ - && !defined(__NetBSD__) -#if !defined(__FreeBSD__) -#define HAS_WAITID 1 -#endif -#endif - - -// Get exit status of child. -static bool WaitForChild(int pid, - ZombieProtector& child_waiter, - struct timeval& start_time, - int read_timeout, - int total_timeout) { -#ifdef HAS_WAITID - - siginfo_t child_info; - child_info.si_pid = 0; - int useconds = 1; - // Wait for child to exit. - while (child_info.si_pid == 0) { - waitid(P_PID, pid, &child_info, WEXITED | WNOHANG | WNOWAIT); - usleep(useconds); - if (useconds < 1000000) useconds <<= 1; - if ((read_timeout != -1 && useconds / 1000 > read_timeout) || - (TimeIsOut(start_time, total_timeout))) { - ThrowException(String::New("Timed out waiting for process to terminate")); - kill(pid, SIGINT); - return false; - } - } - if (child_info.si_code == CLD_KILLED) { - char message[999]; - snprintf(message, - sizeof(message), - "Child killed by signal %d", - child_info.si_status); - ThrowException(String::New(message)); - return false; - } - if (child_info.si_code == CLD_EXITED && child_info.si_status != 0) { - char message[999]; - snprintf(message, - sizeof(message), - "Child exited with status %d", - child_info.si_status); - ThrowException(String::New(message)); - return false; - } - -#else // No waitid call. - - int child_status; - waitpid(pid, &child_status, 0); // We hang here if the child doesn't exit. - child_waiter.ChildIsDeadNow(); - if (WIFSIGNALED(child_status)) { - char message[999]; - snprintf(message, - sizeof(message), - "Child killed by signal %d", - WTERMSIG(child_status)); - ThrowException(String::New(message)); - return false; - } - if (WEXITSTATUS(child_status) != 0) { - char message[999]; - int exit_status = WEXITSTATUS(child_status); - snprintf(message, - sizeof(message), - "Child exited with status %d", - exit_status); - ThrowException(String::New(message)); - return false; - } - -#endif // No waitid call. - - return true; -} - - -// Implementation of the system() function (see d8.h for details). -Handle<Value> Shell::System(const Arguments& args) { - HandleScope scope; - int read_timeout = -1; - int total_timeout = -1; - if (!GetTimeouts(args, &read_timeout, &total_timeout)) return v8::Undefined(); - Handle<Array> command_args; - if (args.Length() > 1) { - if (!args[1]->IsArray()) { - return ThrowException(String::New("system: Argument 2 must be an array")); - } - command_args = Handle<Array>::Cast(args[1]); - } else { - command_args = Array::New(0); - } - if (command_args->Length() > ExecArgs::kMaxArgs) { - return ThrowException(String::New("Too many arguments to system()")); - } - if (args.Length() < 1) { - return ThrowException(String::New("Too few arguments to system()")); - } - - struct timeval start_time; - gettimeofday(&start_time, NULL); - - ExecArgs exec_args; - if (!exec_args.Init(args[0], command_args)) { - return v8::Undefined(); - } - int exec_error_fds[2]; - int stdout_fds[2]; - - if (pipe(exec_error_fds) != 0) { - return ThrowException(String::New("pipe syscall failed.")); - } - if (pipe(stdout_fds) != 0) { - return ThrowException(String::New("pipe syscall failed.")); - } - - pid_t pid = fork(); - if (pid == 0) { // Child process. - ExecSubprocess(exec_error_fds, stdout_fds, exec_args); - exit(1); - } - - // Parent process. Ensure that we clean up if we exit this function early. - ZombieProtector child_waiter(pid); - close(exec_error_fds[kWriteFD]); - close(stdout_fds[kWriteFD]); - OpenFDCloser error_read_closer(exec_error_fds[kReadFD]); - OpenFDCloser stdout_read_closer(stdout_fds[kReadFD]); - - if (!ChildLaunchedOK(exec_error_fds)) return v8::Undefined(); - - Handle<Value> accumulator = GetStdout(stdout_fds[kReadFD], - start_time, - read_timeout, - total_timeout); - if (accumulator->IsUndefined()) { - kill(pid, SIGINT); // On timeout, kill the subprocess. - return accumulator; - } - - if (!WaitForChild(pid, - child_waiter, - start_time, - read_timeout, - total_timeout)) { - return v8::Undefined(); - } - - return scope.Close(accumulator); -} - - -Handle<Value> Shell::ChangeDirectory(const Arguments& args) { - if (args.Length() != 1) { - const char* message = "chdir() takes one argument"; - return ThrowException(String::New(message)); - } - String::Utf8Value directory(args[0]); - if (*directory == NULL) { - const char* message = "os.chdir(): String conversion of argument failed."; - return ThrowException(String::New(message)); - } - if (chdir(*directory) != 0) { - return ThrowException(String::New(strerror(errno))); - } - return v8::Undefined(); -} - - -Handle<Value> Shell::SetUMask(const Arguments& args) { - if (args.Length() != 1) { - const char* message = "umask() takes one argument"; - return ThrowException(String::New(message)); - } - if (args[0]->IsNumber()) { - mode_t mask = args[0]->Int32Value(); - int previous = umask(mask); - return Number::New(previous); - } else { - const char* message = "umask() argument must be numeric"; - return ThrowException(String::New(message)); - } -} - - -static bool CheckItsADirectory(char* directory) { - struct stat stat_buf; - int stat_result = stat(directory, &stat_buf); - if (stat_result != 0) { - ThrowException(String::New(strerror(errno))); - return false; - } - if ((stat_buf.st_mode & S_IFDIR) != 0) return true; - ThrowException(String::New(strerror(EEXIST))); - return false; -} - - -// Returns true for success. Creates intermediate directories as needed. No -// error if the directory exists already. -static bool mkdirp(char* directory, mode_t mask) { - int result = mkdir(directory, mask); - if (result == 0) return true; - if (errno == EEXIST) { - return CheckItsADirectory(directory); - } else if (errno == ENOENT) { // Intermediate path element is missing. - char* last_slash = strrchr(directory, '/'); - if (last_slash == NULL) { - ThrowException(String::New(strerror(errno))); - return false; - } - *last_slash = 0; - if (!mkdirp(directory, mask)) return false; - *last_slash = '/'; - result = mkdir(directory, mask); - if (result == 0) return true; - if (errno == EEXIST) { - return CheckItsADirectory(directory); - } - ThrowException(String::New(strerror(errno))); - return false; - } else { - ThrowException(String::New(strerror(errno))); - return false; - } -} - - -Handle<Value> Shell::MakeDirectory(const Arguments& args) { - mode_t mask = 0777; - if (args.Length() == 2) { - if (args[1]->IsNumber()) { - mask = args[1]->Int32Value(); - } else { - const char* message = "mkdirp() second argument must be numeric"; - return ThrowException(String::New(message)); - } - } else if (args.Length() != 1) { - const char* message = "mkdirp() takes one or two arguments"; - return ThrowException(String::New(message)); - } - String::Utf8Value directory(args[0]); - if (*directory == NULL) { - const char* message = "os.mkdirp(): String conversion of argument failed."; - return ThrowException(String::New(message)); - } - mkdirp(*directory, mask); - return v8::Undefined(); -} - - -Handle<Value> Shell::RemoveDirectory(const Arguments& args) { - if (args.Length() != 1) { - const char* message = "rmdir() takes one or two arguments"; - return ThrowException(String::New(message)); - } - String::Utf8Value directory(args[0]); - if (*directory == NULL) { - const char* message = "os.rmdir(): String conversion of argument failed."; - return ThrowException(String::New(message)); - } - rmdir(*directory); - return v8::Undefined(); -} - - -Handle<Value> Shell::SetEnvironment(const Arguments& args) { - if (args.Length() != 2) { - const char* message = "setenv() takes two arguments"; - return ThrowException(String::New(message)); - } - String::Utf8Value var(args[0]); - String::Utf8Value value(args[1]); - if (*var == NULL) { - const char* message = - "os.setenv(): String conversion of variable name failed."; - return ThrowException(String::New(message)); - } - if (*value == NULL) { - const char* message = - "os.setenv(): String conversion of variable contents failed."; - return ThrowException(String::New(message)); - } - setenv(*var, *value, 1); - return v8::Undefined(); -} - - -Handle<Value> Shell::UnsetEnvironment(const Arguments& args) { - if (args.Length() != 1) { - const char* message = "unsetenv() takes one argument"; - return ThrowException(String::New(message)); - } - String::Utf8Value var(args[0]); - if (*var == NULL) { - const char* message = - "os.setenv(): String conversion of variable name failed."; - return ThrowException(String::New(message)); - } - unsetenv(*var); - return v8::Undefined(); -} - - -void Shell::AddOSMethods(Handle<ObjectTemplate> os_templ) { - os_templ->Set(String::New("system"), FunctionTemplate::New(System)); - os_templ->Set(String::New("chdir"), FunctionTemplate::New(ChangeDirectory)); - os_templ->Set(String::New("setenv"), FunctionTemplate::New(SetEnvironment)); - os_templ->Set(String::New("unsetenv"), - FunctionTemplate::New(UnsetEnvironment)); - os_templ->Set(String::New("umask"), FunctionTemplate::New(SetUMask)); - os_templ->Set(String::New("mkdirp"), FunctionTemplate::New(MakeDirectory)); - os_templ->Set(String::New("rmdir"), FunctionTemplate::New(RemoveDirectory)); -} - -} // namespace v8 |