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* Daemon.node
*** A node.JS addon that allows creating Unix/Linux Daemons in pure Javascript.
*** Copyright 2010 (c) <>
* Under MIT License. See LICENSE file.
#include <v8.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fcntl.h>
#define PID_MAXLEN 10
using namespace v8;
// Go through special routines to become a daemon.
// if successful, returns daemon's PID
Handle<Value> Start(const Arguments& args) {
pid_t pid, sid;
int i;
pid = fork();
if(pid > 0) exit(0);
if(pid < 0) exit(1);
return Integer::New(getpid());
// Close Standard IN/OUT/ERR Streams
Handle<Value> CloseIO(const Arguments& args) {
// Sets new session id for current process
Handle<Value> SetSid(const Arguments& args) {
pid_t sid;
sid = setsid();
return Integer::New(sid);
// File-lock to make sure that only one instance of daemon is running.. also for storing PID
/* lock ( filename )
*** filename: a path to a lock-file.
*** Note: if filename doesn't exist, it will be created when function is called.
Handle<Value> LockD(const Arguments& args) {
return Boolean::New(false);
String::Utf8Value data(args[0]->ToString());
char pid_str[PID_MAXLEN+1];
int lfp = open(*data, O_RDWR | O_CREAT, 0640);
if(lfp < 0) exit(1);
if(lockf(lfp, F_TLOCK, 0) < 0) exit(0);
int len = snprintf(pid_str, PID_MAXLEN, "%d", getpid());
write(lfp, pid_str, len);
return Boolean::New(true);
extern "C" void init(Handle<Object> target) {
HandleScope scope;
target->Set(String::New("start"), FunctionTemplate::New(Start)->GetFunction());
target->Set(String::New("lock"), FunctionTemplate::New(LockD)->GetFunction());
target->Set(String::New("closeIO"), FunctionTemplate::New(CloseIO)->GetFunction());
target->Set(String::New("setSid"), FunctionTemplate::New(SetSid)->GetFunction());
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