cmd/uplink: raise fd limits

Change-Id: I507c92c38d45d3d2be3edee08b6b85552ae21c43

cmd/uplink/main.go

@@ -17,6 +17,7 @@ import (
 
 func main() {
 	ex := newExternal()
+	raiseUlimits()
 	ok, err := clingy.Environment{
 		Name:    "uplink",
 		Args:    os.Args[1:],

cmd/uplink/ulimit.go

@@ -0,0 +1,22 @@
+// Copyright (C) 2021 Storj Labs, Inc.
+// See LICENSE for copying information.
+
+//go:build linux || darwin || freebsd
+// +build linux darwin freebsd
+
+package main
+
+import "syscall"
+
+// raise RLIMIT_NOFILE softlimit to hardlimit.
+func raiseUlimits() {
+	var rLimit syscall.Rlimit
+	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
+	if err != nil {
+		return
+	}
+	if rLimit.Cur < rLimit.Max {
+		rLimit.Cur = rLimit.Max
+		_ = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
+	}
+}

cmd/uplink/ulimit_other.go

@@ -0,0 +1,11 @@
+// Copyright (C) 2021 Storj Labs, Inc.
+// See LICENSE for copying information.
+
+//go:build !linux && !darwin && !freebsd
+// +build !linux,!darwin,!freebsd
+
+package main
+
+func raiseUlimits() {
+	return
+}