<li><a href="/block">Synchronization blocking profile</a> (<a href="/block?raw=1" download="block.profile">⬇</a>)</li>
<li><a href="/syscall">Syscall profile</a> (<a href="/syscall?raw=1" download="syscall.profile">⬇</a>)</li>
<li><a href="/sched">Scheduler latency profile</a> (<a href="/sched?raw=1" download="sched.profile">⬇</a>)</li>
</ul>

<h2>User-defined tasks and regions</h2>
<p>

func parseAddrs(attrs uint, fn func(int, []byte) (int, Addr, error), b []byte) ([]Addr, error) {
	var as [syscall.RTAX_MAX]Addr
	af := int(syscall.AF_UNSPEC)
	for i := uint(0); i < syscall.RTAX_MAX && len(b) >= roundup(0); i++ {
		if attrs&(1<<i) == 0 {
			continue
		}
		if i <= syscall.RTAX_BRD {
			switch b[1] {
			case syscall.AF_LINK:
				a, err := parseLinkAddr(b)
				if err != nil {
					return nil, err
				}

	Slen   uint8
	Data   [12]int8
	raw    RawSockaddrDatalink
}

func anyToSockaddrGOOS(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
	return nil, EAFNOSUPPORT
}

func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)

func sysctlNodes(mib []_C_int) (nodes []Sysctlnode, err error) {
	var olen uintptr

	// Get a list of all sysctl nodes below the given MIB by performing

	header windows.REPARSE_DATA_BUFFER_HEADER
	detail [syscall.MAXIMUM_REPARSE_DATA_BUFFER_SIZE]byte
}

func createDirLink(link string, rdb *_REPARSE_DATA_BUFFER) error {
	err := os.Mkdir(link, 0777)
	if err != nil {
		return err
	}

	linkp := syscall.StringToUTF16(link)
	fd, err := syscall.CreateFile(&linkp[0], syscall.GENERIC_WRITE, 0, nil, syscall.OPEN_EXISTING,

	}
	if os.Getenv("GO_WANT_READ_NONBLOCKING_FD") == "1" {
		fd := syscallDescriptor(os.Stdin.Fd())
		syscall.SetNonblock(fd, true)
		defer syscall.SetNonblock(fd, false)
		_, err := os.Stdin.Read(make([]byte, 1))
		if err != nil {
			if perr, ok := err.(*fs.PathError); !ok || perr.Err != syscall.EAGAIN {
				t.Fatalf("read on nonblocking stdin got %q, should have gotten EAGAIN", err)
			}
		}
		os.Exit(0)
	}

	< io;

	RUNTIME
	< arena;

	syscall !< io;
	reflect !< sort;

	RUNTIME, unicode/utf8
	< path;

	unicode !< path;

	# SYSCALL is RUNTIME plus the packages necessary for basic system calls.
	RUNTIME, unicode/utf8, unicode/utf16
	< internal/syscall/windows/sysdll, syscall/js
	< syscall
	< internal/syscall/unix, internal/syscall/windows, internal/syscall/windows/registry
	< internal/syscall/execenv

	CLONE_IO             = 0x80000000 // Clone io context

	// Flags for the clone3() syscall.

	CLONE_CLEAR_SIGHAND = 0x100000000 // Clear any signal handler and reset to SIG_DFL.
	CLONE_INTO_CGROUP   = 0x200000000 // Clone into a specific cgroup given the right permissions.

	// Cloning flags intersect with CSIGNAL so can be used with unshare and clone3
	// syscalls only:

	CLONE_NEWTIME = 0x00000080 // New time namespace
)

//
//	// INVALID: conversion of nil pointer
//	u := unsafe.Pointer(nil)
//	p := unsafe.Pointer(uintptr(u) + offset)
//
// (4) Conversion of a Pointer to a uintptr when calling [syscall.Syscall].
//
// The Syscall functions in package syscall pass their uintptr arguments directly
// to the operating system, which then may, depending on the details of the call,
// reinterpret some of them as pointers.

	EvGoUnblock           // goroutine is unblocked [timestamp, goroutine ID, goroutine seq, stack ID]
	EvGoSyscallBegin      // syscall enter [timestamp, P seq, stack ID]
	EvGoSyscallEnd        // syscall exit [timestamp]
	EvGoSyscallEndBlocked // syscall exit and it blocked at some point [timestamp]
	EvGoStatus            // goroutine status at the start of a generation [timestamp, goroutine ID, thread ID, status]

	// This bypasses the non-blocking support and is required
	// to recreate the problem in the issue (#59041).
	ttyFD, err := syscall.Open(ttyName, syscall.O_RDWR, 0)
	if err != nil {
		t.Skipf("skipping test because failed to open tty: %v", err)
	}
	defer syscall.Close(ttyFD)

	tty := NewFile(uintptr(ttyFD), "tty")
	defer tty.Close()

	client, server := createSocketPair(t, proto)