added dependency github.com/sevlyar/go-daemon

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

@@ -0,0 +1,88 @@
+package daemon
+
+import (
+	"errors"
+	"os"
+	"syscall"
+)
+
+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)
+
+// A Context describes daemon context.
+type Context struct {
+	// If PidFileName is non-empty, parent process will try to create and lock
+	// pid file with given name. Child process writes process id to file.
+	PidFileName string
+	// Permissions for new pid file.
+	PidFilePerm os.FileMode
+
+	// If LogFileName is non-empty, parent process will create file with given name
+	// and will link to fd 2 (stderr) for child process.
+	LogFileName string
+	// Permissions for new log file.
+	LogFilePerm os.FileMode
+
+	// If WorkDir is non-empty, the child changes into the directory before
+	// creating the process.
+	WorkDir string
+	// If Chroot is non-empty, the child changes root directory
+	Chroot string
+
+	// If Env is non-nil, it gives the environment variables for the
+	// daemon-process in the form returned by os.Environ.
+	// If it is nil, the result of os.Environ will be used.
+	Env []string
+	// If Args is non-nil, it gives the command-line args for the
+	// daemon-process. If it is nil, the result of os.Args will be used
+	// (without program name).
+	Args []string
+
+	// Credential holds user and group identities to be assumed by a daemon-process.
+	Credential *syscall.Credential
+	// If Umask is non-zero, the daemon-process call Umask() func with given value.
+	Umask int
+
+	// Struct contains only serializable public fields (!!!)
+	abspath  string
+	pidFile  *LockFile
+	logFile  *os.File
+	nullFile *os.File
+
+	rpipe, wpipe *os.File
+}
+
+// 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 search 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() (err error) {
+	return d.release()
+}