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