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// Copyright 2009 Ryan Dahl <>
#include <node.h>
#include <node_object_wrap.h>
#include <v8.h>
#include <ev.h>
// ChildProcess is a thin wrapper around ev_child. It has the extra
// functionality that it can spawn a child process with pipes connected to
// its stdin, stdout, stderr. This class is not meant to be exposed to but
// wrapped up in a more friendly EventEmitter with streams for each of the
// pipes.
// When the child process exits (when the parent receives SIGCHLD) the
// callback child.onexit will be called.
namespace node {
class ChildProcess : ObjectWrap {
static void Initialize(v8::Handle<v8::Object> target);
static v8::Handle<v8::Value> New(const v8::Arguments& args);
static v8::Handle<v8::Value> Spawn(const v8::Arguments& args);
static v8::Handle<v8::Value> Kill(const v8::Arguments& args);
ChildProcess() : ObjectWrap() {
ev_init(&child_watcher_, ChildProcess::on_chld); = this;
pid_ = -1;
~ChildProcess() {
// Returns 0 on success. stdio_fds will contain file desciptors for stdin,
// stdout, and stderr of the subprocess. stdin is writable; the other two
// are readable.
// The user of this class has responsibility to close these pipes after
// the child process exits.
int Spawn(const char *file, char *const argv[], const char *cwd, char **env, int stdio_fds[3], int custom_fds[3]);
// Simple syscall wrapper. Does not disable the watcher. onexit will be
// called still.
int Kill(int sig);
void OnExit(int code);
void Stop(void);
static void on_chld(EV_P_ ev_child *watcher, int revents) {
ChildProcess *child = static_cast<ChildProcess*>(watcher->data);
assert(revents == EV_CHILD);
assert(child->pid_ == watcher->rpid);
assert(&child->child_watcher_ == watcher);
ev_child child_watcher_;
pid_t pid_;
} // namespace node