SIGCONT   = syscall.Signal(0x12)
	SIGIO     = syscall.Signal(0x1d)
	SIGPOLL   = syscall.Signal(0x1d)
	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.Signal(0x1f)
	SIGTSTP   = syscall.Signal(0x14)
	SIGTTIN   = syscall.Signal(0x15)
	SIGTTOU   = syscall.Signal(0x16)
	SIGURG    = syscall.Signal(0x17)

	SIGCONT   = syscall.Signal(0x12)
	SIGIO     = syscall.Signal(0x1d)
	SIGPOLL   = syscall.Signal(0x1d)
	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.Signal(0x1f)
	SIGTSTP   = syscall.Signal(0x14)
	SIGTTIN   = syscall.Signal(0x15)
	SIGTTOU   = syscall.Signal(0x16)
	SIGURG    = syscall.Signal(0x17)

	origLimit := syscall.OrigRlimitNofile()
	origRlimitNofile := syscall.GetInternalOrigRlimitNofile()

	if origLimit == nil {
		defer origRlimitNofile.Store(origLimit)
		origRlimitNofile.Store(&syscall.Rlimit{
			Cur: 1024,
			Max: 65536,
		})
	}

	// Get current process's nofile limit
	var lim syscall.Rlimit
	if err := syscall.Prlimit(0, syscall.RLIMIT_NOFILE, nil, &lim); err != nil {

func (fd *FD) WriteTo(p []byte, sa syscall.Sockaddr) (int, error) {
	if err := fd.writeLock(); err != nil {
		return 0, err
	}
	defer fd.writeUnlock()
	if err := fd.pd.prepareWrite(fd.isFile); err != nil {
		return 0, err
	}
	for {
		err := syscall.Sendto(fd.Sysfd, p, 0, sa)
		if err == syscall.EINTR {
			continue
		}
		if err == syscall.EAGAIN && fd.pd.pollable() {

	SIGCONT   = syscall.Signal(0x12)
	SIGIO     = syscall.Signal(0x1d)
	SIGPOLL   = syscall.Signal(0x1d)
	SIGPROF   = syscall.Signal(0x1b)
	SIGPWR    = syscall.Signal(0x1e)
	SIGSTKFLT = syscall.Signal(0x10)
	SIGSTOP   = syscall.Signal(0x13)
	SIGSYS    = syscall.Signal(0x1f)
	SIGTSTP   = syscall.Signal(0x14)
	SIGTTIN   = syscall.Signal(0x15)
	SIGTTOU   = syscall.Signal(0x16)
	SIGURG    = syscall.Signal(0x17)

	cmd.SysProcAttr = &syscall.SysProcAttr{
		Unshareflags:               syscall.CLONE_NEWNS | syscall.CLONE_NEWUSER,
		GidMappingsEnableSetgroups: false,
		UidMappings: []syscall.SysProcIDMap{
			{
				ContainerID: 0,
				HostID:      syscall.Getuid(),
				Size:        1,
			},
		},
		GidMappings: []syscall.SysProcIDMap{
			{
				ContainerID: 0,

	ADD	$8, R1, R3
	MOVW	$0, R4
	SYSCALL	$SYS_nanosleep
	RET

TEXT runtime·gettid(SB),NOSPLIT,$0-4
	SYSCALL	$SYS_gettid
	MOVW	R3, ret+0(FP)
	RET

TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
	SYSCALL	$SYS_getpid
	MOVW	R3, R14
	SYSCALL	$SYS_gettid
	MOVW	R3, R4	// arg 2 tid
	MOVW	R14, R3	// arg 1 pid
	MOVW	sig+0(FP), R5	// arg 3
	SYSCALL	$SYS_tgkill
	RET

	if kind == kindOpenFile {
		switch runtime.GOOS {
		case "darwin", "ios", "dragonfly", "freebsd", "netbsd", "openbsd":
			var st syscall.Stat_t
			err := ignoringEINTR(func() error {
				return syscall.Fstat(fd, &st)
			})
			typ := st.Mode & syscall.S_IFMT
			// Don't try to use kqueue with regular files on *BSDs.
			// On FreeBSD a regular file is always
			// reported as ready for writing.

		name:       "syscall",
		startTime:  gs.syscall.time,
		endTime:    ts,
		startStack: gs.syscall.stack,
		arg:        format.BlockedArg{Blocked: blockString},
	})
	gs.syscall.active = false
	gs.syscall.time = 0
	gs.syscall.stack = trace.NoStack
}

// blockedSyscallEnd indicates the point at which the blocked syscall ended. This is distinct

// (in addition to standard package syscall).
// Do not remove or change the type signature.
//
// syscall.syscall6 is meant for package syscall (and x/sys),
// but widely used packages access it using linkname.
// Notable members of the hall of shame include:
//   - github.com/tetratelabs/wazero
//
// See go.dev/issue/67401.
//
//go:linkname syscall_syscall6 syscall.syscall6
//go:nosplit