node/src/node_child_process.cc at debugger · bionicpill/node · GitHub

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#include <node_child_process.h>

#include <assert.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/types.h>

namespace node {

using namespace v8;

#define PID_SYMBOL String::NewSymbol("pid")

Persistent<FunctionTemplate> ChildProcess::constructor_template;

void ChildProcess::Initialize(Handle<Object> target) {

HandleScope scope;

Local<FunctionTemplate> t = FunctionTemplate::New(ChildProcess::New);

constructor_template = Persistent<FunctionTemplate>::New(t);

constructor_template->Inherit(EventEmitter::constructor_template);

constructor_template->InstanceTemplate()->SetInternalFieldCount(1);

constructor_template->SetClassName(String::NewSymbol("ChildProcess"));

NODE_SET_PROTOTYPE_METHOD(constructor_template, "spawn", ChildProcess::Spawn);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "write", ChildProcess::Write);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "close", ChildProcess::Close);

NODE_SET_PROTOTYPE_METHOD(constructor_template, "kill", ChildProcess::Kill);

target->Set(String::NewSymbol("ChildProcess"),

constructor_template->GetFunction());

}

Handle<Value> ChildProcess::New(const Arguments& args) {

HandleScope scope;

ChildProcess *p = new ChildProcess();

p->Wrap(args.Holder());

return args.This();

}

// This is an internal function. The third argument should be an array

// of key value pairs seperated with '='.

Handle<Value> ChildProcess::Spawn(const Arguments& args) {

HandleScope scope;

if ( args.Length() != 3

|| !args[0]->IsString()

|| !args[1]->IsArray()

|| !args[2]->IsArray()

)

{

return ThrowException(Exception::Error(String::New("Bad argument.")));

}

ChildProcess *child = ObjectWrap::Unwrap<ChildProcess>(args.Holder());

String::Utf8Value file(args[0]->ToString());

int i;

// Copy second argument args[1] into a c-string array called argv.

// The array must be null terminated, and the first element must be

// the name of the executable -- hence the complication.

Local<Array> argv_handle = Local<Array>::Cast(args[1]);

int argc = argv_handle->Length();

int argv_length = argc + 1 + 1;

char **argv = new char*[argv_length]; // heap allocated to detect errors

argv[0] = strdup(*file); // + 1 for file

argv[argv_length-1] = NULL; // + 1 for NULL;

for (i = 0; i < argc; i++) {

String::Utf8Value arg(argv_handle->Get(Integer::New(i))->ToString());

argv[i+1] = strdup(*arg);

}

// Copy third argument, args[2], into a c-string array called env.

Local<Array> env_handle = Local<Array>::Cast(args[2]);

int envc = env_handle->Length();

char **env = new char*[envc+1]; // heap allocated to detect errors

env[envc] = NULL;

for (int i = 0; i < envc; i++) {

String::Utf8Value pair(env_handle->Get(Integer::New(i))->ToString());

env[i] = strdup(*pair);

}

int r = child->Spawn(argv[0], argv, env);

for (i = 0; i < argv_length; i++) free(argv[i]);

delete [] argv;

for (i = 0; i < envc; i++) free(env[i]);

delete [] env;

if (r != 0) {

return ThrowException(Exception::Error(String::New("Error spawning")));

}

child->handle_->Set(PID_SYMBOL, Integer::New(child->pid_));

return Undefined();

}

Handle<Value> ChildProcess::Write(const Arguments& args) {

HandleScope scope;

ChildProcess *child = ObjectWrap::Unwrap<ChildProcess>(args.Holder());

assert(child);

enum encoding enc = ParseEncoding(args[1]);

ssize_t len = DecodeBytes(args[0], enc);

if (len < 0) {

Local<Value> exception = Exception::TypeError(String::New("Bad argument"));

return ThrowException(exception);

}

char * buf = new char[len];

ssize_t written = DecodeWrite(buf, len, args[0], enc);

assert(written == len);

int r = child->Write(buf, len);

delete [] buf;

return r == 0 ? True() : False();

}

Handle<Value> ChildProcess::Kill(const Arguments& args) {

HandleScope scope;

ChildProcess *child = ObjectWrap::Unwrap<ChildProcess>(args.Holder());

assert(child);

int sig = SIGTERM;

if (args.Length() > 0) {

if (args[0]->IsNumber()) {

sig = args[0]->Int32Value();

} else if (args[0]->IsString()) {

Local<String> signame = args[0]->ToString();

Local<Object> process = Context::GetCurrent()->Global();

Local<Object> node_obj = process->Get(String::NewSymbol("node"))->ToObject();

Local<Value> sig_v = node_obj->Get(signame);

if (!sig_v->IsNumber()) {

return ThrowException(Exception::Error(String::New("Unknown signal")));

}

sig = sig_v->Int32Value();

}

if (child->Kill(sig) != 0) {

return ThrowException(Exception::Error(String::New(strerror(errno))));

}

return Undefined();

}

Handle<Value> ChildProcess::Close(const Arguments& args) {

HandleScope scope;

ChildProcess *child = ObjectWrap::Unwrap<ChildProcess>(args.Holder());

assert(child);

return child->Close() == 0 ? True() : False();

}

void ChildProcess::reader_closed(evcom_reader *r) {

ChildProcess *child = static_cast<ChildProcess*>(r->data);

if (r == &child->stdout_reader_) {

child->stdout_fd_ = -1;

} else {

assert(r == &child->stderr_reader_);

child->stderr_fd_ = -1;

}

evcom_reader_detach(r);

child->MaybeShutdown();

}

void ChildProcess::stdin_closed(evcom_writer *w) {

ChildProcess *child = static_cast<ChildProcess*>(w->data);

assert(w == &child->stdin_writer_);

child->stdin_fd_ = -1;

evcom_writer_detach(w);

child->MaybeShutdown();

}

void ChildProcess::on_read(evcom_reader *r, const void *buf, size_t len) {

ChildProcess *child = static_cast<ChildProcess*>(r->data);

HandleScope scope;

bool isSTDOUT = (r == &child->stdout_reader_);

enum encoding encoding = isSTDOUT ?

child->stdout_encoding_ : child->stderr_encoding_;

Local<Value> data = Encode(buf, len, encoding);

child->Emit(isSTDOUT ? "output" : "error", 1, &data);

child->MaybeShutdown();

}

ChildProcess::ChildProcess() : EventEmitter() {

evcom_reader_init(&stdout_reader_);

stdout_reader_.data = this;

stdout_reader_.on_read = on_read;

stdout_reader_.on_close = reader_closed;

evcom_reader_init(&stderr_reader_);

stderr_reader_.data = this;

stderr_reader_.on_read = on_read;

stderr_reader_.on_close = reader_closed;

evcom_writer_init(&stdin_writer_);

stdin_writer_.data = this;

stdin_writer_.on_close = stdin_closed;

ev_init(&child_watcher_, ChildProcess::OnCHLD);

child_watcher_.data = this;

stdout_fd_ = -1;

stderr_fd_ = -1;

stdin_fd_ = -1;

stdout_encoding_ = UTF8;

stderr_encoding_ = UTF8;

got_chld_ = false;

exit_code_ = 0;

pid_ = 0;

}

ChildProcess::~ChildProcess() {

Shutdown();

}

void ChildProcess::Shutdown() {

if (stdin_fd_ >= 0) {

evcom_writer_close(&stdin_writer_);

}

if (stdin_fd_ >= 0) close(stdin_fd_);

if (stdout_fd_ >= 0) close(stdout_fd_);

if (stderr_fd_ >= 0) close(stderr_fd_);

stdin_fd_ = -1;

stdout_fd_ = -1;

stderr_fd_ = -1;

evcom_writer_detach(&stdin_writer_);

evcom_reader_detach(&stdout_reader_);

evcom_reader_detach(&stderr_reader_);

ev_child_stop(EV_DEFAULT_UC_ &child_watcher_);

/* XXX Kill the PID? */

pid_ = 0;

}

static inline int SetNonBlocking(int fd) {

int flags = fcntl(fd, F_GETFL, 0);

int r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);

if (r != 0) {

perror("SetNonBlocking()");

}

return r;

}

// Note that args[0] must be the same as the "file" param. This is an

// execvp() requirement.

int ChildProcess::Spawn(const char *file, char *const args[], char *const env[]) {

assert(pid_ == 0);

assert(stdout_fd_ == -1);

assert(stderr_fd_ == -1);

assert(stdin_fd_ == -1);

int stdout_pipe[2], stdin_pipe[2], stderr_pipe[2];

/* An implementation of popen(), basically */

if (pipe(stdout_pipe) < 0) {

perror("pipe()");

return -1;

}

if (pipe(stderr_pipe) < 0) {

perror("pipe()");

return -2;

}

if (pipe(stdin_pipe) < 0) {

perror("pipe()");

return -3;

}

switch (pid_ = vfork()) {

case -1: // Error.

Shutdown();

return -4;

case 0: // Child.

close(stdout_pipe[0]); // close read end

dup2(stdout_pipe[1], STDOUT_FILENO);

close(stderr_pipe[0]); // close read end

dup2(stderr_pipe[1], STDERR_FILENO);

close(stdin_pipe[1]); // close write end

dup2(stdin_pipe[0], STDIN_FILENO);

execvp(file, args);

perror("execvp()");

_exit(127);

// TODO search PATH and use: execve(file, argv, env);

}

// Parent.

ev_child_set(&child_watcher_, pid_, 0);

ev_child_start(EV_DEFAULT_UC_ &child_watcher_);

close(stdout_pipe[1]);

stdout_fd_ = stdout_pipe[0];

SetNonBlocking(stdout_fd_);

close(stderr_pipe[1]);

stderr_fd_ = stderr_pipe[0];

SetNonBlocking(stderr_fd_);

close(stdin_pipe[0]);

stdin_fd_ = stdin_pipe[1];

SetNonBlocking(stdin_fd_);

evcom_reader_set(&stdout_reader_, stdout_fd_);

evcom_reader_attach(EV_DEFAULT_UC_ &stdout_reader_);

evcom_reader_set(&stderr_reader_, stderr_fd_);

evcom_reader_attach(EV_DEFAULT_UC_ &stderr_reader_);

evcom_writer_set(&stdin_writer_, stdin_fd_);

evcom_writer_attach(EV_DEFAULT_UC_ &stdin_writer_);

Attach();

return 0;

}

void ChildProcess::OnCHLD(EV_P_ ev_child *watcher, int revents) {

ev_child_stop(EV_A_ watcher);

ChildProcess *child = static_cast<ChildProcess*>(watcher->data);

assert(revents == EV_CHILD);

assert(child->pid_ == watcher->rpid);

assert(&child->child_watcher_ == watcher);

child->got_chld_ = true;

child->exit_code_ = watcher->rstatus;

if (child->stdin_fd_ >= 0) evcom_writer_close(&child->stdin_writer_);

child->MaybeShutdown();

}

int ChildProcess::Write(const char *str, size_t len) {

if (stdin_fd_ < 0 || got_chld_) return -1;

evcom_writer_write(&stdin_writer_, str, len);

return 0;

}

int ChildProcess::Close(void) {

if (stdin_fd_ < 0 || got_chld_) return -1;

evcom_writer_close(&stdin_writer_);

return 0;

}

int ChildProcess::Kill(int sig) {

if (got_chld_ || pid_ == 0) return -1;

return kill(pid_, sig);

}

void ChildProcess::MaybeShutdown(void) {

if (stdout_fd_ < 0 && stderr_fd_ < 0 && got_chld_) {

HandleScope scope;

Handle<Value> argv[1] = { Integer::New(exit_code_) };

Emit("exit", 1, argv);

Shutdown();

Detach();

}

} // namespace node

node/src/node_child_process.cc at debugger · bionicpill/node · GitHub

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