ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 1 | // Copyright 2009 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | |
| 29 | #include <stdlib.h> |
| 30 | #include <errno.h> |
| 31 | #include <sys/types.h> |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 32 | #include <sys/stat.h> |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 33 | #include <sys/time.h> |
| 34 | #include <time.h> |
| 35 | #include <unistd.h> |
| 36 | #include <fcntl.h> |
| 37 | #include <sys/wait.h> |
| 38 | #include <signal.h> |
| 39 | |
| 40 | |
| 41 | #include "d8.h" |
| 42 | #include "d8-debug.h" |
| 43 | #include "debug.h" |
| 44 | |
| 45 | |
| 46 | namespace v8 { |
| 47 | |
| 48 | |
| 49 | // If the buffer ends in the middle of a UTF-8 sequence then we return |
| 50 | // the length of the string up to but not including the incomplete UTF-8 |
| 51 | // sequence. If the buffer ends with a valid UTF-8 sequence then we |
| 52 | // return the whole buffer. |
| 53 | static int LengthWithoutIncompleteUtf8(char* buffer, int len) { |
| 54 | int answer = len; |
| 55 | // 1-byte encoding. |
| 56 | static const int kUtf8SingleByteMask = 0x80; |
| 57 | static const int kUtf8SingleByteValue = 0x00; |
| 58 | // 2-byte encoding. |
| 59 | static const int kUtf8TwoByteMask = 0xe0; |
| 60 | static const int kUtf8TwoByteValue = 0xc0; |
| 61 | // 3-byte encoding. |
| 62 | static const int kUtf8ThreeByteMask = 0xf0; |
| 63 | static const int kUtf8ThreeByteValue = 0xe0; |
| 64 | // 4-byte encoding. |
| 65 | static const int kUtf8FourByteMask = 0xf8; |
| 66 | static const int kUtf8FourByteValue = 0xf0; |
| 67 | // Subsequent bytes of a multi-byte encoding. |
| 68 | static const int kMultiByteMask = 0xc0; |
| 69 | static const int kMultiByteValue = 0x80; |
| 70 | int multi_byte_bytes_seen = 0; |
| 71 | while (answer > 0) { |
| 72 | int c = buffer[answer - 1]; |
| 73 | // Ends in valid single-byte sequence? |
| 74 | if ((c & kUtf8SingleByteMask) == kUtf8SingleByteValue) return answer; |
| 75 | // Ends in one or more subsequent bytes of a multi-byte value? |
| 76 | if ((c & kMultiByteMask) == kMultiByteValue) { |
| 77 | multi_byte_bytes_seen++; |
| 78 | answer--; |
| 79 | } else { |
| 80 | if ((c & kUtf8TwoByteMask) == kUtf8TwoByteValue) { |
| 81 | if (multi_byte_bytes_seen >= 1) { |
| 82 | return answer + 2; |
| 83 | } |
| 84 | return answer - 1; |
| 85 | } else if ((c & kUtf8ThreeByteMask) == kUtf8ThreeByteValue) { |
| 86 | if (multi_byte_bytes_seen >= 2) { |
| 87 | return answer + 3; |
| 88 | } |
| 89 | return answer - 1; |
| 90 | } else if ((c & kUtf8FourByteMask) == kUtf8FourByteValue) { |
| 91 | if (multi_byte_bytes_seen >= 3) { |
| 92 | return answer + 4; |
| 93 | } |
| 94 | return answer - 1; |
| 95 | } else { |
| 96 | return answer; // Malformed UTF-8. |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | |
| 104 | // Suspends the thread until there is data available from the child process. |
| 105 | // Returns false on timeout, true on data ready. |
| 106 | static bool WaitOnFD(int fd, |
| 107 | int read_timeout, |
kasperl@chromium.org | 2d18d10 | 2009-04-15 13:27:32 +0000 | [diff] [blame] | 108 | int total_timeout, |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 109 | struct timeval& start_time) { |
| 110 | fd_set readfds, writefds, exceptfds; |
| 111 | struct timeval timeout; |
kasperl@chromium.org | 2d18d10 | 2009-04-15 13:27:32 +0000 | [diff] [blame] | 112 | int gone = 0; |
| 113 | if (total_timeout != -1) { |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 114 | struct timeval time_now; |
| 115 | gettimeofday(&time_now, NULL); |
| 116 | int seconds = time_now.tv_sec - start_time.tv_sec; |
kasperl@chromium.org | 2d18d10 | 2009-04-15 13:27:32 +0000 | [diff] [blame] | 117 | gone = seconds * 1000 + (time_now.tv_usec - start_time.tv_usec) / 1000; |
| 118 | if (gone >= total_timeout) return false; |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 119 | } |
| 120 | FD_ZERO(&readfds); |
| 121 | FD_ZERO(&writefds); |
| 122 | FD_ZERO(&exceptfds); |
| 123 | FD_SET(fd, &readfds); |
| 124 | FD_SET(fd, &exceptfds); |
| 125 | if (read_timeout == -1 || |
kasperl@chromium.org | 2d18d10 | 2009-04-15 13:27:32 +0000 | [diff] [blame] | 126 | (total_timeout != -1 && total_timeout - gone < read_timeout)) { |
| 127 | read_timeout = total_timeout - gone; |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 128 | } |
| 129 | timeout.tv_usec = (read_timeout % 1000) * 1000; |
| 130 | timeout.tv_sec = read_timeout / 1000; |
| 131 | int number_of_fds_ready = select(fd + 1, |
| 132 | &readfds, |
| 133 | &writefds, |
| 134 | &exceptfds, |
| 135 | read_timeout != -1 ? &timeout : NULL); |
| 136 | return number_of_fds_ready == 1; |
| 137 | } |
| 138 | |
| 139 | |
| 140 | // Checks whether we ran out of time on the timeout. Returns true if we ran out |
| 141 | // of time, false if we still have time. |
| 142 | static bool TimeIsOut(const struct timeval& start_time, const int& total_time) { |
| 143 | if (total_time == -1) return false; |
| 144 | struct timeval time_now; |
| 145 | gettimeofday(&time_now, NULL); |
| 146 | // Careful about overflow. |
| 147 | int seconds = time_now.tv_sec - start_time.tv_sec; |
| 148 | if (seconds > 100) { |
| 149 | if (seconds * 1000 > total_time) return true; |
| 150 | return false; |
| 151 | } |
| 152 | int useconds = time_now.tv_usec - start_time.tv_usec; |
| 153 | if (seconds * 1000000 + useconds > total_time * 1000) { |
| 154 | return true; |
| 155 | } |
| 156 | return false; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | // A utility class that does a non-hanging waitpid on the child process if we |
| 161 | // bail out of the System() function early. If you don't ever do a waitpid on |
| 162 | // a subprocess then it turns into one of those annoying 'zombie processes'. |
| 163 | class ZombieProtector { |
| 164 | public: |
| 165 | explicit ZombieProtector(int pid): pid_(pid) { } |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 166 | ~ZombieProtector() { if (pid_ != 0) waitpid(pid_, NULL, 0); } |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 167 | void ChildIsDeadNow() { pid_ = 0; } |
| 168 | private: |
| 169 | int pid_; |
| 170 | }; |
| 171 | |
| 172 | |
| 173 | // A utility class that closes a file descriptor when it goes out of scope. |
| 174 | class OpenFDCloser { |
| 175 | public: |
| 176 | explicit OpenFDCloser(int fd): fd_(fd) { } |
| 177 | ~OpenFDCloser() { close(fd_); } |
| 178 | private: |
| 179 | int fd_; |
| 180 | }; |
| 181 | |
| 182 | |
| 183 | // A utility class that takes the array of command arguments and puts then in an |
| 184 | // array of new[]ed UTF-8 C strings. Deallocates them again when it goes out of |
| 185 | // scope. |
| 186 | class ExecArgs { |
| 187 | public: |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 188 | ExecArgs() { |
| 189 | exec_args_[0] = NULL; |
| 190 | } |
| 191 | bool Init(Handle<Value> arg0, Handle<Array> command_args) { |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 192 | String::Utf8Value prog(arg0); |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 193 | if (*prog == NULL) { |
| 194 | const char* message = |
| 195 | "os.system(): String conversion of program name failed"; |
| 196 | ThrowException(String::New(message)); |
| 197 | return false; |
| 198 | } |
| 199 | int len = prog.length() + 3; |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 200 | char* c_arg = new char[len]; |
| 201 | snprintf(c_arg, len, "%s", *prog); |
| 202 | exec_args_[0] = c_arg; |
| 203 | int i = 1; |
| 204 | for (unsigned j = 0; j < command_args->Length(); i++, j++) { |
| 205 | Handle<Value> arg(command_args->Get(Integer::New(j))); |
| 206 | String::Utf8Value utf8_arg(arg); |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 207 | if (*utf8_arg == NULL) { |
| 208 | exec_args_[i] = NULL; // Consistent state for destructor. |
| 209 | const char* message = |
| 210 | "os.system(): String conversion of argument failed."; |
| 211 | ThrowException(String::New(message)); |
| 212 | return false; |
| 213 | } |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 214 | int len = utf8_arg.length() + 1; |
| 215 | char* c_arg = new char[len]; |
| 216 | snprintf(c_arg, len, "%s", *utf8_arg); |
| 217 | exec_args_[i] = c_arg; |
| 218 | } |
| 219 | exec_args_[i] = NULL; |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 220 | return true; |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 221 | } |
| 222 | ~ExecArgs() { |
| 223 | for (unsigned i = 0; i < kMaxArgs; i++) { |
| 224 | if (exec_args_[i] == NULL) { |
| 225 | return; |
| 226 | } |
| 227 | delete [] exec_args_[i]; |
| 228 | exec_args_[i] = 0; |
| 229 | } |
| 230 | } |
| 231 | static const unsigned kMaxArgs = 1000; |
| 232 | char** arg_array() { return exec_args_; } |
| 233 | char* arg0() { return exec_args_[0]; } |
| 234 | private: |
| 235 | char* exec_args_[kMaxArgs + 1]; |
| 236 | }; |
| 237 | |
| 238 | |
| 239 | // Gets the optional timeouts from the arguments to the system() call. |
| 240 | static bool GetTimeouts(const Arguments& args, |
| 241 | int* read_timeout, |
| 242 | int* total_timeout) { |
| 243 | if (args.Length() > 3) { |
| 244 | if (args[3]->IsNumber()) { |
| 245 | *total_timeout = args[3]->Int32Value(); |
| 246 | } else { |
| 247 | ThrowException(String::New("system: Argument 4 must be a number")); |
| 248 | return false; |
| 249 | } |
| 250 | } |
| 251 | if (args.Length() > 2) { |
| 252 | if (args[2]->IsNumber()) { |
| 253 | *read_timeout = args[2]->Int32Value(); |
| 254 | } else { |
| 255 | ThrowException(String::New("system: Argument 3 must be a number")); |
| 256 | return false; |
| 257 | } |
| 258 | } |
| 259 | return true; |
| 260 | } |
| 261 | |
| 262 | |
| 263 | static const int kReadFD = 0; |
| 264 | static const int kWriteFD = 1; |
| 265 | |
| 266 | |
| 267 | // This is run in the child process after fork() but before exec(). It normally |
| 268 | // ends with the child process being replaced with the desired child program. |
| 269 | // It only returns if an error occurred. |
| 270 | static void ExecSubprocess(int* exec_error_fds, |
| 271 | int* stdout_fds, |
| 272 | ExecArgs& exec_args) { |
| 273 | close(exec_error_fds[kReadFD]); // Don't need this in the child. |
| 274 | close(stdout_fds[kReadFD]); // Don't need this in the child. |
| 275 | close(1); // Close stdout. |
| 276 | dup2(stdout_fds[kWriteFD], 1); // Dup pipe fd to stdout. |
| 277 | close(stdout_fds[kWriteFD]); // Don't need the original fd now. |
| 278 | fcntl(exec_error_fds[kWriteFD], F_SETFD, FD_CLOEXEC); |
| 279 | execvp(exec_args.arg0(), exec_args.arg_array()); |
| 280 | // Only get here if the exec failed. Write errno to the parent to tell |
| 281 | // them it went wrong. If it went well the pipe is closed. |
| 282 | int err = errno; |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 283 | int bytes_written; |
| 284 | do { |
| 285 | bytes_written = write(exec_error_fds[kWriteFD], &err, sizeof(err)); |
| 286 | } while (bytes_written == -1 && errno == EINTR); |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 287 | // Return (and exit child process). |
| 288 | } |
| 289 | |
| 290 | |
| 291 | // Runs in the parent process. Checks that the child was able to exec (closing |
| 292 | // the file desriptor), or reports an error if it failed. |
| 293 | static bool ChildLaunchedOK(int* exec_error_fds) { |
| 294 | int bytes_read; |
| 295 | int err; |
| 296 | do { |
| 297 | bytes_read = read(exec_error_fds[kReadFD], &err, sizeof(err)); |
| 298 | } while (bytes_read == -1 && errno == EINTR); |
| 299 | if (bytes_read != 0) { |
| 300 | ThrowException(String::New(strerror(err))); |
| 301 | return false; |
| 302 | } |
| 303 | return true; |
| 304 | } |
| 305 | |
| 306 | |
| 307 | // Accumulates the output from the child in a string handle. Returns true if it |
| 308 | // succeeded or false if an exception was thrown. |
| 309 | static Handle<Value> GetStdout(int child_fd, |
| 310 | struct timeval& start_time, |
| 311 | int read_timeout, |
kasperl@chromium.org | 2d18d10 | 2009-04-15 13:27:32 +0000 | [diff] [blame] | 312 | int total_timeout) { |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 313 | Handle<String> accumulator = String::Empty(); |
christian.plesner.hansen@gmail.com | 9d58c2b | 2009-10-16 11:48:38 +0000 | [diff] [blame] | 314 | const char* source = "(function(a, b) { return a + b; })"; |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 315 | Handle<Value> cons_as_obj(Script::Compile(String::New(source))->Run()); |
| 316 | Handle<Function> cons_function(Function::Cast(*cons_as_obj)); |
| 317 | Handle<Value> cons_args[2]; |
| 318 | |
| 319 | int fullness = 0; |
| 320 | static const int kStdoutReadBufferSize = 4096; |
| 321 | char buffer[kStdoutReadBufferSize]; |
| 322 | |
| 323 | if (fcntl(child_fd, F_SETFL, O_NONBLOCK) != 0) { |
| 324 | return ThrowException(String::New(strerror(errno))); |
| 325 | } |
| 326 | |
| 327 | int bytes_read; |
| 328 | do { |
| 329 | bytes_read = read(child_fd, |
| 330 | buffer + fullness, |
| 331 | kStdoutReadBufferSize - fullness); |
| 332 | if (bytes_read == -1) { |
| 333 | if (errno == EAGAIN) { |
| 334 | if (!WaitOnFD(child_fd, |
| 335 | read_timeout, |
| 336 | total_timeout, |
| 337 | start_time) || |
kasperl@chromium.org | 2d18d10 | 2009-04-15 13:27:32 +0000 | [diff] [blame] | 338 | (TimeIsOut(start_time, total_timeout))) { |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 339 | return ThrowException(String::New("Timed out waiting for output")); |
| 340 | } |
| 341 | continue; |
| 342 | } else if (errno == EINTR) { |
| 343 | continue; |
| 344 | } else { |
| 345 | break; |
| 346 | } |
| 347 | } |
| 348 | if (bytes_read + fullness > 0) { |
| 349 | int length = bytes_read == 0 ? |
| 350 | bytes_read + fullness : |
| 351 | LengthWithoutIncompleteUtf8(buffer, bytes_read + fullness); |
| 352 | Handle<String> addition = String::New(buffer, length); |
| 353 | cons_args[0] = accumulator; |
| 354 | cons_args[1] = addition; |
| 355 | accumulator = Handle<String>::Cast(cons_function->Call( |
| 356 | Shell::utility_context()->Global(), |
| 357 | 2, |
| 358 | cons_args)); |
| 359 | fullness = bytes_read + fullness - length; |
| 360 | memcpy(buffer, buffer + length, fullness); |
| 361 | } |
| 362 | } while (bytes_read != 0); |
| 363 | return accumulator; |
| 364 | } |
| 365 | |
| 366 | |
| 367 | // Modern Linux has the waitid call, which is like waitpid, but more useful |
| 368 | // if you want a timeout. If we don't have waitid we can't limit the time |
| 369 | // waiting for the process to exit without losing the information about |
| 370 | // whether it exited normally. In the common case this doesn't matter because |
| 371 | // we don't get here before the child has closed stdout and most programs don't |
| 372 | // do that before they exit. |
kasperl@chromium.org | defbd10 | 2009-07-13 14:04:26 +0000 | [diff] [blame] | 373 | // |
| 374 | // We're disabling usage of waitid in Mac OS X because it doens't work for us: |
| 375 | // a parent process hangs on waiting while a child process is already a zombie. |
| 376 | // See http://code.google.com/p/v8/issues/detail?id=401. |
| 377 | #if defined(WNOWAIT) && !defined(ANDROID) && !defined(__APPLE__) |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 378 | #define HAS_WAITID 1 |
| 379 | #endif |
| 380 | |
| 381 | |
| 382 | // Get exit status of child. |
| 383 | static bool WaitForChild(int pid, |
| 384 | ZombieProtector& child_waiter, |
| 385 | struct timeval& start_time, |
| 386 | int read_timeout, |
| 387 | int total_timeout) { |
| 388 | #ifdef HAS_WAITID |
| 389 | |
| 390 | siginfo_t child_info; |
| 391 | child_info.si_pid = 0; |
| 392 | int useconds = 1; |
| 393 | // Wait for child to exit. |
| 394 | while (child_info.si_pid == 0) { |
| 395 | waitid(P_PID, pid, &child_info, WEXITED | WNOHANG | WNOWAIT); |
| 396 | usleep(useconds); |
| 397 | if (useconds < 1000000) useconds <<= 1; |
| 398 | if ((read_timeout != -1 && useconds / 1000 > read_timeout) || |
| 399 | (TimeIsOut(start_time, total_timeout))) { |
| 400 | ThrowException(String::New("Timed out waiting for process to terminate")); |
| 401 | kill(pid, SIGINT); |
| 402 | return false; |
| 403 | } |
| 404 | } |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 405 | if (child_info.si_code == CLD_KILLED) { |
| 406 | char message[999]; |
| 407 | snprintf(message, |
| 408 | sizeof(message), |
| 409 | "Child killed by signal %d", |
| 410 | child_info.si_status); |
| 411 | ThrowException(String::New(message)); |
| 412 | return false; |
| 413 | } |
| 414 | if (child_info.si_code == CLD_EXITED && child_info.si_status != 0) { |
| 415 | char message[999]; |
| 416 | snprintf(message, |
| 417 | sizeof(message), |
| 418 | "Child exited with status %d", |
| 419 | child_info.si_status); |
| 420 | ThrowException(String::New(message)); |
| 421 | return false; |
| 422 | } |
| 423 | |
| 424 | #else // No waitid call. |
| 425 | |
| 426 | int child_status; |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 427 | waitpid(pid, &child_status, 0); // We hang here if the child doesn't exit. |
| 428 | child_waiter.ChildIsDeadNow(); |
| 429 | if (WIFSIGNALED(child_status)) { |
| 430 | char message[999]; |
| 431 | snprintf(message, |
| 432 | sizeof(message), |
| 433 | "Child killed by signal %d", |
| 434 | WTERMSIG(child_status)); |
| 435 | ThrowException(String::New(message)); |
| 436 | return false; |
| 437 | } |
| 438 | if (WEXITSTATUS(child_status) != 0) { |
| 439 | char message[999]; |
| 440 | int exit_status = WEXITSTATUS(child_status); |
| 441 | snprintf(message, |
| 442 | sizeof(message), |
| 443 | "Child exited with status %d", |
| 444 | exit_status); |
| 445 | ThrowException(String::New(message)); |
| 446 | return false; |
| 447 | } |
| 448 | |
| 449 | #endif // No waitid call. |
| 450 | |
| 451 | return true; |
| 452 | } |
| 453 | |
| 454 | |
| 455 | // Implementation of the system() function (see d8.h for details). |
| 456 | Handle<Value> Shell::System(const Arguments& args) { |
| 457 | HandleScope scope; |
| 458 | int read_timeout = -1; |
| 459 | int total_timeout = -1; |
| 460 | if (!GetTimeouts(args, &read_timeout, &total_timeout)) return v8::Undefined(); |
| 461 | Handle<Array> command_args; |
| 462 | if (args.Length() > 1) { |
| 463 | if (!args[1]->IsArray()) { |
| 464 | return ThrowException(String::New("system: Argument 2 must be an array")); |
| 465 | } |
| 466 | command_args = Handle<Array>::Cast(args[1]); |
| 467 | } else { |
| 468 | command_args = Array::New(0); |
| 469 | } |
| 470 | if (command_args->Length() > ExecArgs::kMaxArgs) { |
| 471 | return ThrowException(String::New("Too many arguments to system()")); |
| 472 | } |
| 473 | if (args.Length() < 1) { |
| 474 | return ThrowException(String::New("Too few arguments to system()")); |
| 475 | } |
| 476 | |
| 477 | struct timeval start_time; |
| 478 | gettimeofday(&start_time, NULL); |
| 479 | |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 480 | ExecArgs exec_args; |
| 481 | if (!exec_args.Init(args[0], command_args)) { |
| 482 | return v8::Undefined(); |
| 483 | } |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 484 | int exec_error_fds[2]; |
| 485 | int stdout_fds[2]; |
| 486 | |
| 487 | if (pipe(exec_error_fds) != 0) { |
| 488 | return ThrowException(String::New("pipe syscall failed.")); |
| 489 | } |
| 490 | if (pipe(stdout_fds) != 0) { |
| 491 | return ThrowException(String::New("pipe syscall failed.")); |
| 492 | } |
| 493 | |
| 494 | pid_t pid = fork(); |
| 495 | if (pid == 0) { // Child process. |
| 496 | ExecSubprocess(exec_error_fds, stdout_fds, exec_args); |
| 497 | exit(1); |
| 498 | } |
| 499 | |
| 500 | // Parent process. Ensure that we clean up if we exit this function early. |
| 501 | ZombieProtector child_waiter(pid); |
| 502 | close(exec_error_fds[kWriteFD]); |
| 503 | close(stdout_fds[kWriteFD]); |
| 504 | OpenFDCloser error_read_closer(exec_error_fds[kReadFD]); |
| 505 | OpenFDCloser stdout_read_closer(stdout_fds[kReadFD]); |
| 506 | |
| 507 | if (!ChildLaunchedOK(exec_error_fds)) return v8::Undefined(); |
| 508 | |
| 509 | Handle<Value> accumulator = GetStdout(stdout_fds[kReadFD], |
| 510 | start_time, |
| 511 | read_timeout, |
kasperl@chromium.org | 2d18d10 | 2009-04-15 13:27:32 +0000 | [diff] [blame] | 512 | total_timeout); |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 513 | if (accumulator->IsUndefined()) { |
| 514 | kill(pid, SIGINT); // On timeout, kill the subprocess. |
| 515 | return accumulator; |
| 516 | } |
| 517 | |
| 518 | if (!WaitForChild(pid, |
| 519 | child_waiter, |
| 520 | start_time, |
| 521 | read_timeout, |
| 522 | total_timeout)) { |
| 523 | return v8::Undefined(); |
| 524 | } |
| 525 | |
| 526 | return scope.Close(accumulator); |
| 527 | } |
| 528 | |
| 529 | |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 530 | Handle<Value> Shell::ChangeDirectory(const Arguments& args) { |
| 531 | if (args.Length() != 1) { |
| 532 | const char* message = "chdir() takes one argument"; |
| 533 | return ThrowException(String::New(message)); |
| 534 | } |
| 535 | String::Utf8Value directory(args[0]); |
| 536 | if (*directory == NULL) { |
| 537 | const char* message = "os.chdir(): String conversion of argument failed."; |
| 538 | return ThrowException(String::New(message)); |
| 539 | } |
| 540 | if (chdir(*directory) != 0) { |
| 541 | return ThrowException(String::New(strerror(errno))); |
| 542 | } |
| 543 | return v8::Undefined(); |
| 544 | } |
| 545 | |
| 546 | |
| 547 | Handle<Value> Shell::SetUMask(const Arguments& args) { |
| 548 | if (args.Length() != 1) { |
| 549 | const char* message = "umask() takes one argument"; |
| 550 | return ThrowException(String::New(message)); |
| 551 | } |
| 552 | if (args[0]->IsNumber()) { |
| 553 | mode_t mask = args[0]->Int32Value(); |
| 554 | int previous = umask(mask); |
| 555 | return Number::New(previous); |
| 556 | } else { |
| 557 | const char* message = "umask() argument must be numeric"; |
| 558 | return ThrowException(String::New(message)); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | |
| 563 | static bool CheckItsADirectory(char* directory) { |
| 564 | struct stat stat_buf; |
| 565 | int stat_result = stat(directory, &stat_buf); |
| 566 | if (stat_result != 0) { |
| 567 | ThrowException(String::New(strerror(errno))); |
| 568 | return false; |
| 569 | } |
| 570 | if ((stat_buf.st_mode & S_IFDIR) != 0) return true; |
| 571 | ThrowException(String::New(strerror(EEXIST))); |
| 572 | return false; |
| 573 | } |
| 574 | |
| 575 | |
| 576 | // Returns true for success. Creates intermediate directories as needed. No |
| 577 | // error if the directory exists already. |
| 578 | static bool mkdirp(char* directory, mode_t mask) { |
| 579 | int result = mkdir(directory, mask); |
| 580 | if (result == 0) return true; |
| 581 | if (errno == EEXIST) { |
| 582 | return CheckItsADirectory(directory); |
| 583 | } else if (errno == ENOENT) { // Intermediate path element is missing. |
| 584 | char* last_slash = strrchr(directory, '/'); |
| 585 | if (last_slash == NULL) { |
| 586 | ThrowException(String::New(strerror(errno))); |
| 587 | return false; |
| 588 | } |
| 589 | *last_slash = 0; |
| 590 | if (!mkdirp(directory, mask)) return false; |
| 591 | *last_slash = '/'; |
| 592 | result = mkdir(directory, mask); |
| 593 | if (result == 0) return true; |
| 594 | if (errno == EEXIST) { |
| 595 | return CheckItsADirectory(directory); |
| 596 | } |
| 597 | ThrowException(String::New(strerror(errno))); |
| 598 | return false; |
| 599 | } else { |
| 600 | ThrowException(String::New(strerror(errno))); |
| 601 | return false; |
| 602 | } |
| 603 | } |
| 604 | |
| 605 | |
| 606 | Handle<Value> Shell::MakeDirectory(const Arguments& args) { |
| 607 | mode_t mask = 0777; |
| 608 | if (args.Length() == 2) { |
| 609 | if (args[1]->IsNumber()) { |
| 610 | mask = args[1]->Int32Value(); |
| 611 | } else { |
| 612 | const char* message = "mkdirp() second argument must be numeric"; |
| 613 | return ThrowException(String::New(message)); |
| 614 | } |
| 615 | } else if (args.Length() != 1) { |
| 616 | const char* message = "mkdirp() takes one or two arguments"; |
| 617 | return ThrowException(String::New(message)); |
| 618 | } |
| 619 | String::Utf8Value directory(args[0]); |
| 620 | if (*directory == NULL) { |
| 621 | const char* message = "os.mkdirp(): String conversion of argument failed."; |
| 622 | return ThrowException(String::New(message)); |
| 623 | } |
| 624 | mkdirp(*directory, mask); |
| 625 | return v8::Undefined(); |
| 626 | } |
| 627 | |
| 628 | |
| 629 | Handle<Value> Shell::RemoveDirectory(const Arguments& args) { |
| 630 | if (args.Length() != 1) { |
| 631 | const char* message = "rmdir() takes one or two arguments"; |
| 632 | return ThrowException(String::New(message)); |
| 633 | } |
| 634 | String::Utf8Value directory(args[0]); |
| 635 | if (*directory == NULL) { |
| 636 | const char* message = "os.rmdir(): String conversion of argument failed."; |
| 637 | return ThrowException(String::New(message)); |
| 638 | } |
| 639 | rmdir(*directory); |
| 640 | return v8::Undefined(); |
| 641 | } |
| 642 | |
| 643 | |
| 644 | Handle<Value> Shell::SetEnvironment(const Arguments& args) { |
| 645 | if (args.Length() != 2) { |
| 646 | const char* message = "setenv() takes two arguments"; |
| 647 | return ThrowException(String::New(message)); |
| 648 | } |
| 649 | String::Utf8Value var(args[0]); |
| 650 | String::Utf8Value value(args[1]); |
| 651 | if (*var == NULL) { |
| 652 | const char* message = |
| 653 | "os.setenv(): String conversion of variable name failed."; |
| 654 | return ThrowException(String::New(message)); |
| 655 | } |
| 656 | if (*value == NULL) { |
| 657 | const char* message = |
| 658 | "os.setenv(): String conversion of variable contents failed."; |
| 659 | return ThrowException(String::New(message)); |
| 660 | } |
| 661 | setenv(*var, *value, 1); |
| 662 | return v8::Undefined(); |
| 663 | } |
| 664 | |
| 665 | |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 666 | Handle<Value> Shell::UnsetEnvironment(const Arguments& args) { |
| 667 | if (args.Length() != 1) { |
| 668 | const char* message = "unsetenv() takes one argument"; |
| 669 | return ThrowException(String::New(message)); |
| 670 | } |
| 671 | String::Utf8Value var(args[0]); |
| 672 | if (*var == NULL) { |
| 673 | const char* message = |
| 674 | "os.setenv(): String conversion of variable name failed."; |
| 675 | return ThrowException(String::New(message)); |
| 676 | } |
| 677 | unsetenv(*var); |
| 678 | return v8::Undefined(); |
| 679 | } |
| 680 | |
| 681 | |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 682 | void Shell::AddOSMethods(Handle<ObjectTemplate> os_templ) { |
| 683 | os_templ->Set(String::New("system"), FunctionTemplate::New(System)); |
| 684 | os_templ->Set(String::New("chdir"), FunctionTemplate::New(ChangeDirectory)); |
| 685 | os_templ->Set(String::New("setenv"), FunctionTemplate::New(SetEnvironment)); |
whesse@chromium.org | b6e43bb | 2010-04-14 09:36:28 +0000 | [diff] [blame] | 686 | os_templ->Set(String::New("unsetenv"), |
| 687 | FunctionTemplate::New(UnsetEnvironment)); |
ager@chromium.org | 71daaf6 | 2009-04-01 07:22:49 +0000 | [diff] [blame] | 688 | os_templ->Set(String::New("umask"), FunctionTemplate::New(SetUMask)); |
| 689 | os_templ->Set(String::New("mkdirp"), FunctionTemplate::New(MakeDirectory)); |
| 690 | os_templ->Set(String::New("rmdir"), FunctionTemplate::New(RemoveDirectory)); |
| 691 | } |
| 692 | |
ager@chromium.org | 41826e7 | 2009-03-30 13:30:57 +0000 | [diff] [blame] | 693 | } // namespace v8 |