From 4397cd7fc2e3c297f4d4e85ae5e631fac346e135 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Mon, 15 Nov 2021 21:22:43 +0100
Subject: [PATCH] cmd/soju: bump max number of opened files

The bouncer process may be dealing with many opened FDs. The default
on Linux is 1024. To support bouncers with a lot of users, bump
RLIMIT_NOFILE to the max as advised in [1].

[1]: http://0pointer.net/blog/file-descriptor-limits.html
---
 cmd/soju/main.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/cmd/soju/main.go b/cmd/soju/main.go
index f8626f0..186573e 100644
--- a/cmd/soju/main.go
+++ b/cmd/soju/main.go
@@ -50,6 +50,18 @@ func loadMOTD(srv *soju.Server, filename string) error {
 	return nil
 }
 
+func bumpOpenedFileLimit() error {
+	var rlimit syscall.Rlimit
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlimit); err != nil {
+		return fmt.Errorf("failed to get RLIMIT_NOFILE: %v", err)
+	}
+	rlimit.Cur = rlimit.Max
+	if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rlimit); err != nil {
+		return fmt.Errorf("failed to set RLIMIT_NOFILE: %v", err)
+	}
+	return nil
+}
+
 func main() {
 	var listen []string
 	var configPath string
@@ -75,6 +87,10 @@ func main() {
 		cfg.Listen = []string{":6697"}
 	}
 
+	if err := bumpOpenedFileLimit(); err != nil {
+		log.Printf("failed to bump max number of opened files: %v", err)
+	}
+
 	db, err := soju.OpenDB(cfg.SQLDriver, cfg.SQLSource)
 	if err != nil {
 		log.Fatalf("failed to open database: %v", err)