From 5f72125f9519cb4ca837e053dce9107ad53094e8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vin=C3=ADcius=20Jabes?= <vinijabes@gmail.com>
Date: Wed, 19 Aug 2020 15:57:50 -0300
Subject: [PATCH 1/3] Add method to return service pid

---
 service.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/service.go b/service.go
index 784ccd8..80d994b 100644
--- a/service.go
+++ b/service.go
@@ -164,6 +164,11 @@ func (s Service) FrameBuffer() *FrameBuffer {
 	return s.xvfb
 }
 
+//PID returns the service pid
+func (s Service) PID() int {
+	return s.cmd.Process.Pid
+}
+
 // NewSeleniumService starts a Selenium instance in the background.
 func NewSeleniumService(jarPath string, port int, opts ...ServiceOption) (*Service, error) {
 	s, err := newService(exec.Command("java"), "/wd/hub", port, opts...)

From d4bf8bb48339ace8dae665a5cc695f0e9f79e2c4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vin=C3=ADcius=20Jabes?= <vinijabes@gmail.com>
Date: Wed, 19 Aug 2020 15:59:53 -0300
Subject: [PATCH 2/3] Add check for existing proccess before returning pid

---
 service.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/service.go b/service.go
index 80d994b..5d13954 100644
--- a/service.go
+++ b/service.go
@@ -166,7 +166,11 @@ func (s Service) FrameBuffer() *FrameBuffer {
 
 //PID returns the service pid
 func (s Service) PID() int {
-	return s.cmd.Process.Pid
+	if s.cmd != nil {
+		return s.cmd.Process.Pid
+	}
+
+	return 0
 }
 
 // NewSeleniumService starts a Selenium instance in the background.

From db35d55ecdb03709f9c766a9d83875e092f9b3e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vin=C3=ADcius=20Jabes?= <vinijabes@gmail.com>
Date: Sat, 27 Mar 2021 17:01:56 -0300
Subject: [PATCH 3/3] fix(pid): change invalid pid value

---
 service.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/service.go b/service.go
index 5d13954..6c4ab72 100644
--- a/service.go
+++ b/service.go
@@ -15,6 +15,8 @@ import (
 	"time"
 )
 
+const InvalidPid = -1
+
 // ServiceOption configures a Service instance.
 type ServiceOption func(*Service) error
 
@@ -170,7 +172,7 @@ func (s Service) PID() int {
 		return s.cmd.Process.Pid
 	}
 
-	return 0
+	return InvalidPid
 }
 
 // NewSeleniumService starts a Selenium instance in the background.