return listen("tcp6", "[::1]:0")
		}
	case "tcp4":
		if supportsIPv4() {
			return listen("tcp4", "127.0.0.1:0")
		}
	case "tcp6":
		if supportsIPv6() {
			return listen("tcp6", "[::1]:0")
		}
	case "unix", "unixpacket":
		return listen(network, testUnixAddr(t))
	}

	t.Helper()
	t.Fatalf("%s is not supported", network)
	return nil
}

func newDualStackListener() (lns []*TCPListener, err error) {

		t.Run(tc.name, func(t *testing.T) {
			expiryTimestamp, _ := kb.ExtractRootCertExpiryTimestamp()
			// Ignore error; it just indicates cert is expired which we check via `tc.ttl`

			sec := expiryTimestamp - float64(tc.time.Unix())
			if sec != tc.ttl {
				t.Fatalf("expected ttl %v, got %v", tc.ttl, sec)
			}
		})
	}
}

// Test the CA cert expiry timestamp can be extracted correctly.

	return Command(
		CmdUsage{
			Summary: "run an executable program with arguments",
			Args:    "program [args...]",
			Detail: []string{
				"Note that 'exec' does not terminate the script (unlike Unix shells).",
			},
			Async: true,
		},
		func(s *State, args ...string) (WaitFunc, error) {
			if len(args) < 1 {
				return nil, ErrUsage
			}

On Unix systems, the resolver has two options for resolving names.
It can use a pure Go resolver that sends DNS requests directly to the servers
listed in /etc/resolv.conf, or it can use a cgo-based resolver that calls C
library routines such as getaddrinfo and getnameinfo.

On Unix the pure Go resolver is preferred over the cgo resolver, because a blocked DNS

// If f is garbage collected, a finalizer may close the file descriptor,
// making it invalid; see [runtime.SetFinalizer] for more information on when
// a finalizer might be run. On Unix systems this will cause the [File.SetDeadline]
// methods to stop working.
func (file *File) Fd() uintptr {
	if file == nil {
		return uintptr(syscall.InvalidHandle)
	}
	return uintptr(file.pfd.Sysfd)
}

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

/*
Package signal implements access to incoming signals.

Signals are primarily used on Unix-like systems. For the use of this
package on Windows and Plan 9, see below.

# Types of signals

The signals SIGKILL and SIGSTOP may not be caught by a program, and
therefore cannot be affected by this package.

// go run linux/mksysnum.go -Wall -Werror -static -I/tmp/sparc64/include /tmp/sparc64/include/asm/unistd.h
// Code generated by the command above; see README.md. DO NOT EDIT.

//go:build sparc64 && linux

package unix

const (
	SYS_RESTART_SYSCALL         = 0
	SYS_EXIT                    = 1
	SYS_FORK                    = 2
	SYS_READ                    = 3
	SYS_WRITE                   = 4
	SYS_OPEN                    = 5

//go:wasmimport wasi_snapshot_preview1 fd_fdstat_set_flags
//go:noescape
func fd_fdstat_set_flags(fd int32, flags fdflags) Errno

// fd_fdstat_get_flags is accessed from internal/syscall/unix
//go:linkname fd_fdstat_get_flags

func fd_fdstat_get_flags(fd int) (uint32, error) {
	var stat fdstat
	errno := fd_fdstat_get(int32(fd), unsafe.Pointer(&stat))
	return uint32(stat.fdflags), errnoErr(errno)
}

	// Grab the abstract @xtables socket, will retry if the socket exists
	err := wait.PollImmediate(time.Second, wait.ForeverTestTimeout, func() (done bool, err error) {
		runLock, err = net.ListenUnix("unix", &net.UnixAddr{Name: lockPath14x, Net: "unix"})
		if err != nil {
			t.Logf("Failed to lock %s: %v, will retry.", lockPath14x, err)
			return false, nil
		}
		return true, nil
	})
	if err != nil {

   struct __exit_status ut_exit;	/* Exit status of a process marked
 				   as DEAD_PROCESS.  */
 
diff --git a/sysdeps/unix/sysv/linux/if_index.c b/sysdeps/unix/sysv/linux/if_index.c
index 8ba5eae..b620d21 100644
--- a/sysdeps/unix/sysv/linux/if_index.c
+++ b/sysdeps/unix/sysv/linux/if_index.c
@@ -38,12 +38,19 @@ __if_nametoindex (const char *ifname)
   return 0;
 #else
   struct ifreq ifr;