Fix build error on FreeBSD. Closes #1243

core/chat/concurrentConnections.go

@@ -0,0 +1,24 @@
+// +build !freebsd
+
+package chat
+
+import (
+	"syscall"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func setSystemConcurrentConnectionLimit(limit int64) {
+	var rLimit syscall.Rlimit
+	if err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit); err != nil {
+		panic(err)
+	}
+
+	originalLimit := rLimit.Cur
+	rLimit.Cur = uint64(limit)
+	if err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit); err != nil {
+		panic(err)
+	}
+
+	log.Traceln("Max process connection count changed from system limit of", originalLimit, "to", limit)
+}