Updated vendor

vendor/github.com/go-delve/delve/service/debugger/debugger_linux.go

@@ -0,0 +1,36 @@
+package debugger
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"syscall"
+
+	sys "golang.org/x/sys/unix"
+)
+
+func attachErrorMessage(pid int, err error) error {
+	fallbackerr := fmt.Errorf("could not attach to pid %d: %s", pid, err)
+	if serr, ok := err.(syscall.Errno); ok {
+		switch serr {
+		case syscall.EPERM:
+			bs, err := ioutil.ReadFile("/proc/sys/kernel/yama/ptrace_scope")
+			if err == nil && len(bs) >= 1 && bs[0] != '0' {
+				// Yama documentation: https://www.kernel.org/doc/Documentation/security/Yama.txt
+				return fmt.Errorf("Could not attach to pid %d: this could be caused by a kernel security setting, try writing \"0\" to /proc/sys/kernel/yama/ptrace_scope", pid)
+			}
+			fi, err := os.Stat(fmt.Sprintf("/proc/%d", pid))
+			if err != nil {
+				return fallbackerr
+			}
+			if fi.Sys().(*syscall.Stat_t).Uid != uint32(os.Getuid()) {
+				return fmt.Errorf("Could not attach to pid %d: current user does not own the process", pid)
+			}
+		}
+	}
+	return fallbackerr
+}
+
+func stopProcess(pid int) error {
+	return sys.Kill(pid, sys.SIGSTOP)
+}