Add logging of file resource limits in Soong

Test: m nothing and verify in logs
Change-Id: I4b51089ce1d222927a180b260fb9bc0e3b77c468

cmd/soong_ui/main.go

@@ -23,6 +23,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"syscall"
 	"time"
 
 	"android/soong/shared"
@@ -204,6 +205,15 @@ func main() {
 	buildCtx.Verbosef("Parallelism (local/remote/highmem): %v/%v/%v",
 		config.Parallel(), config.RemoteParallel(), config.HighmemParallel())
 
+	{
+		var limits syscall.Rlimit
+		err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &limits)
+		if err != nil {
+			buildCtx.Verbosef("Failed to get file limit:", err)
+		}
+		buildCtx.Verbosef("Current file limits: %d soft, %d hard", limits.Cur, limits.Max)
+	}
+
 	{
 		// The order of the function calls is important. The last defer function call
 		// is the first one that is executed to save the rbe metrics to a protobuf