os/exec: for TestExtraFiles failure, print readlink of unexpected fd

For #25628 Change-Id: If1dce7ba9310e1418e67b9954c989471b775a28e Reviewed-on: https://go-review.googlesource.com/c/go/+/225278 Run-TryBot: Ian Lance Taylor <[email protected]> Reviewed-by: Bryan C. Mills <[email protected]> TryBot-Result: Gobot Gobot <[email protected]>
golang · Mar 24, 2020 · 9f343b1 · 9f343b1
1 parent 60a964e
commit 9f343b1
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/os/exec/exec_test.go b/src/os/exec/exec_test.go
@@ -861,6 +861,9 @@ func TestHelperProcess(*testing.T) {
 			}
 			if got := f.Fd(); got != wantfd {
 				fmt.Printf("leaked parent file. fd = %d; want %d\n", got, wantfd)
+				fdfile := fmt.Sprintf("/proc/self/fd/%d", wantfd)
+				link, err := os.Readlink(fdfile)
+				fmt.Printf("readlink(%q) = %q, %v\n", fdfile, link, err)
 				var args []string
 				switch runtime.GOOS {
 				case "plan9":