Make limits into a pkg.

This is so that we can use the in other utils.

debated with davec

btcd.go

@@ -5,6 +5,7 @@
 package main
 
 import (
+	"github.com/conformal/btcd/limits"
 	"fmt"
 	"net"
 	"net/http"
@@ -128,7 +129,7 @@ func main() {
 	runtime.GOMAXPROCS(runtime.NumCPU())
 
 	// Up some limits.
-	if err := setLimits(); err != nil {
+	if err := limits.SetLimits(); err != nil {
 		os.Exit(1)
 	}
 

limits/limits_plan9.go

@@ -2,9 +2,9 @@
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
-package main
+package limits
 
 // Plan 9 has no process accounting. no-op here
-func setLimits() error {
+func SetLimits() error {
 	return nil
 }

limits/limits_unix.go

@@ -4,7 +4,7 @@
 
 // +build !windows,!plan9
 
-package main
+package limits
 
 import (
 	"fmt"
@@ -16,7 +16,7 @@ const (
 	fileLimitMin  = 1024
 )
 
-func setLimits() error {
+func SetLimits() error {
 	var rLimit syscall.Rlimit
 
 	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)

limits/limits_windows.go

@@ -2,8 +2,8 @@
 // Use of this source code is governed by an ISC
 // license that can be found in the LICENSE file.
 
-package main
+package limits
 
-func setLimits() error {
+func SetLimits() error {
 	return nil
 }

util/addblock/addblock.go

@@ -7,6 +7,7 @@ package main
 import (
 	"encoding/binary"
 	"fmt"
+	"github.com/conformal/btcd/limits"
 	"github.com/conformal/btcdb"
 	_ "github.com/conformal/btcdb/ldb"
 	"github.com/conformal/btclog"
@@ -66,8 +67,14 @@ func main() {
 		return
 	}
 
+	// Use all processor cores.
 	runtime.GOMAXPROCS(runtime.NumCPU())
 
+	// Up some limits.
+	if err := limits.SetLimits(); err != nil {
+		os.Exit(1)
+	}
+
 	backendLogger := btclog.NewDefaultBackendLogger()
 	defer backendLogger.Flush()
 	log = btclog.NewSubsystemLogger(backendLogger, "")