From ca92770b428709f3c8f577ea81b8944802394b85 Mon Sep 17 00:00:00 2001
From: Runxi Yu <me@runxiyu.org>
Date: Sat, 4 Jan 2025 22:04:06 +0800
Subject: Clean up directory file descriptors

---
 config.go | 17 +++++++++++++++++
 go.mod    |  2 +-
 go.sum    |  4 ++--
 main.go   |  1 +
 4 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/config.go b/config.go
index 1ec7207..8ba30ad 100644
--- a/config.go
+++ b/config.go
@@ -3,6 +3,7 @@ package main
 import (
 	"bufio"
 	"os"
+	"reflect"
 	"sync"
 
 	"go.lindenii.runxiyu.org/lindenii-common/misc"
@@ -50,3 +51,19 @@ func prepare_dirs() error {
 	}
 	return nil
 }
+
+// clean_up_dirs closes all directories. It should only be called before
+// program exit.
+func clean_up_dirs() {
+	directories_mutex.Lock()
+	defer directories_mutex.Unlock()
+	directories_rv := reflect.ValueOf(directories)
+	directories_rt := directories_rv.Type()
+	for i := range directories_rt.NumField() {
+		dir, ok := directories_rv.Field(i).Interface().(misc.Dir_t)
+		if !ok {
+			panic("directories contains a field that's not misc.Dir_t")
+		}
+		dir.Close()
+	}
+}
diff --git a/go.mod b/go.mod
index ad6be5f..5ea39e0 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module go.lindenii.runxiyu.org/maild
 
 go 1.23.4
 
-require go.lindenii.runxiyu.org/lindenii-common v0.0.0-20250104131426-7a480ad159b9
+require go.lindenii.runxiyu.org/lindenii-common v0.0.0-20250104140324-f57ba68adb4d
diff --git a/go.sum b/go.sum
index bccd500..1d1725c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +1,2 @@
-go.lindenii.runxiyu.org/lindenii-common v0.0.0-20250104131426-7a480ad159b9 h1:9H+rOwTeOYBoi11NSXn4IN4j0/3zo5nT8HA2Ktrdur0=
-go.lindenii.runxiyu.org/lindenii-common v0.0.0-20250104131426-7a480ad159b9/go.mod h1:bOxuuGXA3UpbLb1lKohr2j2MVcGGLcqfAprGx9VCkMA=
+go.lindenii.runxiyu.org/lindenii-common v0.0.0-20250104140324-f57ba68adb4d h1:ilNgswXXIKwDK/8xvV0UH6FNZ1XpZHxm3s381xz2icM=
+go.lindenii.runxiyu.org/lindenii-common v0.0.0-20250104140324-f57ba68adb4d/go.mod h1:bOxuuGXA3UpbLb1lKohr2j2MVcGGLcqfAprGx9VCkMA=
diff --git a/main.go b/main.go
index 2d6b706..f71391d 100644
--- a/main.go
+++ b/main.go
@@ -23,6 +23,7 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
+	defer clean_up_dirs()
 
 	listener, err := net.Listen("tcp", ":25")
 	if err != nil {
-- 
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