From 1b80844b180213f55a81cbac57dbf679079830e0 Mon Sep 17 00:00:00 2001
From: adamscarmccoy-boop <adamscarmccoy@gmail.com>
Date: Thu, 10 Sep 2026 02:29:56 -0400
Subject: [PATCH 1/2] fix(runner): use os.CreateTemp and mutex serialization
 for atomic resume on Windows

---
 runner/atomic_resume.go | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 runner/atomic_resume.go

diff --git a/runner/atomic_resume.go b/runner/atomic_resume.go
new file mode 100644
index 00000000..89da5dc6
--- /dev/null
+++ b/runner/atomic_resume.go
@@ -0,0 +1,36 @@
+package runner
+
+import (
+	"os"
+	"path/filepath"
+	"sync"
+)
+
+var atomicResumeMutex sync.Mutex
+
+func SaveAtomic(targetPath string, data []byte) error {
+	atomicResumeMutex.Lock()
+	defer atomicResumeMutex.Unlock()
+
+	dir := filepath.Dir(targetPath)
+	tmpFile, err := os.CreateTemp(dir, "httpx-resume-*.tmp")
+	if err != nil {
+		return err
+	}
+	tmpName := tmpFile.Name()
+	defer os.Remove(tmpName)
+
+	if _, err := tmpFile.Write(data); err != nil {
+		tmpFile.Close()
+		return err
+	}
+	if err := tmpFile.Sync(); err != nil {
+		tmpFile.Close()
+		return err
+	}
+	if err := tmpFile.Close(); err != nil {
+		return err
+	}
+
+	return os.Rename(tmpName, targetPath)
+}

From f7076127731ad34cc66994e9d1531394dd82fc25 Mon Sep 17 00:00:00 2001
From: adamscarmccoy-boop <adamscarmccoy@gmail.com>
Date: Fri, 18 Sep 2026 15:01:32 -0400
Subject: [PATCH 2/2] fix(runner): route SaveResumeConfig through SaveAtomic
 and add POSIX syncDir

---
 runner/atomic_resume.go | 37 ++++++++++++++++++++++++++++++++++++-
 runner/runner.go        |  5 +----
 2 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/runner/atomic_resume.go b/runner/atomic_resume.go
index 89da5dc6..172c4e39 100644
--- a/runner/atomic_resume.go
+++ b/runner/atomic_resume.go
@@ -3,11 +3,27 @@ package runner
 import (
 	"os"
 	"path/filepath"
+	"runtime"
 	"sync"
+
+	"gopkg.in/yaml.v3"
 )
 
 var atomicResumeMutex sync.Mutex
 
+// syncDir attempts to fsync the directory containing targetPath on POSIX platforms.
+func syncDir(dirPath string) error {
+	if runtime.GOOS == "windows" {
+		return nil
+	}
+	d, err := os.Open(dirPath)
+	if err != nil {
+		return err
+	}
+	defer d.Close()
+	return d.Sync()
+}
+
 func SaveAtomic(targetPath string, data []byte) error {
 	atomicResumeMutex.Lock()
 	defer atomicResumeMutex.Unlock()
@@ -32,5 +48,24 @@ func SaveAtomic(targetPath string, data []byte) error {
 		return err
 	}
 
-	return os.Rename(tmpName, targetPath)
+	if err := os.Rename(tmpName, targetPath); err != nil {
+		return err
+	}
+
+	return syncDir(dir)
+}
+
+// SaveResumeConfigAtomic serializes the resume config and writes it using SaveAtomic.
+func (r *Runner) SaveResumeConfigAtomic() error {
+	if r.options == nil || r.options.resumeCfg == nil {
+		return nil
+	}
+	var resumeCfg ResumeCfg
+	resumeCfg.Index = r.options.resumeCfg.currentIndex
+	resumeCfg.ResumeFrom = r.options.resumeCfg.current
+	data, err := yaml.Marshal(resumeCfg)
+	if err != nil {
+		return err
+	}
+	return SaveAtomic(DefaultResumeFile, data)
 }
diff --git a/runner/runner.go b/runner/runner.go
index ea0cac3f..ded51325 100644
--- a/runner/runner.go
+++ b/runner/runner.go
@@ -2939,10 +2939,7 @@ func extractPotentialFavIconsURLs(resp []byte) (candidates []string, baseHref st
 
 // SaveResumeConfig to file
 func (r *Runner) SaveResumeConfig() error {
-	var resumeCfg ResumeCfg
-	resumeCfg.Index = r.options.resumeCfg.currentIndex
-	resumeCfg.ResumeFrom = r.options.resumeCfg.current
-	return goconfig.Save(resumeCfg, DefaultResumeFile)
+	return r.SaveResumeConfigAtomic()
 }
 
 // JSON the result