haveSwig = true
	})
	// The first call will skip t with a nice message. On later calls, we just skip.
	if !haveSwig {
		t.Skip("swig not found")
	}
}

func mustHaveSwigOnce(t *testing.T) {
	swig, err := exec.LookPath("swig")
	if err != nil {
		t.Skipf("swig not in PATH: %s", err)
	}

	// Check that swig was installed with Go support by checking
	// that a go directory exists inside the swiglib directory.

			os.Exit(0)
		}
		return err
	}

	// Use the original binary location. This works with symlinks such that if
	// the file it points to has been changed we will use the updated symlink.
	argv0, err := exec.LookPath(os.Args[0])
	if err != nil {
		return err
	}

	// Invokes the execve system call.
	// Re-uses the same pid. This preserves the pid over multiple server-respawns.
	return syscall.Exec(argv0, os.Args, os.Environ())

    </p>
  </dd>
</dl><!-- os -->

<dl id="os/exec"><dt><a href="/pkg/os/exec/">os/exec</a></dt>
  <dd>
    <p><!-- CL 528037 -->
      On Windows, <a href="/pkg/os/exec#LookPath"><code>LookPath</code></a> now
      ignores empty entries in <code>%PATH%</code>, and returns
      <code>ErrNotFound</code> (instead of <code>ErrNotExist</code>) if

   ([#122697](https://github.com/kubernetes/kubernetes/pull/122697), [@pacoxu](https://github.com/pacoxu))
- Used `errors.Is()` to handle errors returned by `LookPath()`.
   ([#122600](https://github.com/kubernetes/kubernetes/pull/122600), [@lzhecheng](https://github.com/lzhecheng))
- kube-proxy: Fixed `LoadBalancerSourceRanges` not working for `nftables` mode.

	}
	args, err := quoted.Split(value)
	if err != nil {
		return nil, err
	}
	if len(args) == 0 {
		return nil, errors.New("CC not set and no default found")
	}
	if _, err := exec.LookPath(args[0]); err != nil {
		return nil, fmt.Errorf("C compiler %q not found: %v", args[0], err)
	}
	return args[:len(args):len(args)], nil
}

pkg os, var Interrupt Signal
pkg os, var Kill Signal
pkg os, var Stderr *File
pkg os, var Stdin *File
pkg os, var Stdout *File
pkg os/exec, func Command(string, ...string) *Cmd
pkg os/exec, func LookPath(string) (string, error)
pkg os/exec, method (*Cmd) CombinedOutput() ([]uint8, error)
pkg os/exec, method (*Cmd) Output() ([]uint8, error)
pkg os/exec, method (*Cmd) Run() error
pkg os/exec, method (*Cmd) Start() error