Add ability to daemonize program, update sample config, README.md, add .gitignore

vendor/github.com/sevlyar/go-daemon/daemon.go

@@ -0,0 +1,44 @@
+package daemon
+
+import (
+	"errors"
+	"os"
+)
+
+var errNotSupported = errors.New("daemon: Non-POSIX OS is not supported")
+
+// Mark of daemon process - system environment variable _GO_DAEMON=1
+const (
+	MARK_NAME  = "_GO_DAEMON"
+	MARK_VALUE = "1"
+)
+
+// Default file permissions for log and pid files.
+const FILE_PERM = os.FileMode(0640)
+
+// WasReborn returns true in child process (daemon) and false in parent process.
+func WasReborn() bool {
+	return os.Getenv(MARK_NAME) == MARK_VALUE
+}
+
+// Reborn runs second copy of current process in the given context.
+// function executes separate parts of code in child process and parent process
+// and provides demonization of child process. It look similar as the
+// fork-daemonization, but goroutine-safe.
+// In success returns *os.Process in parent process and nil in child process.
+// Otherwise returns error.
+func (d *Context) Reborn() (child *os.Process, err error) {
+	return d.reborn()
+}
+
+// Search searches daemons process by given in context pid file name.
+// If success returns pointer on daemons os.Process structure,
+// else returns error. Returns nil if filename is empty.
+func (d *Context) Search() (daemon *os.Process, err error) {
+	return d.search()
+}
+
+// Release provides correct pid-file release in daemon.
+func (d *Context) Release() error {
+	return d.release()
+}