n = int(remain)
		}
		pos1 := pos
		n, err = syscall.Sendfile(dst, src, &pos1, n)
		if err == syscall.EAGAIN || err == syscall.EINTR {
			// partial write may have occurred
			n = int(pos1 - pos)
		}
		if n > 0 {
			pos += int64(n)
			written += int64(n)
			remain -= int64(n)
			continue
		} else if err != syscall.EAGAIN && err != syscall.EINTR {
			// This includes syscall.ENOSYS (no kernel

// license that can be found in the LICENSE file.

package windows_test

import (
	"errors"
	"internal/syscall/windows"
	"syscall"
	"testing"
)

func TestSupportUnixSocket(t *testing.T) {
	var d syscall.WSAData
	if err := syscall.WSAStartup(uint32(0x202), &d); err != nil {
		t.Fatal(err)
	}
	defer syscall.WSACleanup()

	// Test that SupportUnixSocket returns true if WSASocket succeeds with AF_UNIX.

//go:build aix || darwin

package os

import "syscall"

// Pipe returns a connected pair of Files; reads from r return bytes written to w.
// It returns the files and an error, if any.
func Pipe() (r *File, w *File, err error) {
	var p [2]int

	// See ../syscall/exec.go for description of lock.
	syscall.ForkLock.RLock()
	e := syscall.Pipe(p[0:])
	if e != nil {
		syscall.ForkLock.RUnlock()

	_CLD_CONTINUED       = 6

	// These are the same as in syscall/syscall_linux.go.
	core      = 0x80
	stopped   = 0x7f
	continued = 0xffff
)

// WaitStatus converts SiginfoChild, as filled in by the waitid syscall,
// to syscall.WaitStatus.
func (s *SiginfoChild) WaitStatus() (ws syscall.WaitStatus) {
	switch s.Code {
	case _CLD_EXITED:
		ws = syscall.WaitStatus(s.Status << 8)
	case _CLD_DUMPED:

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

package net

import (
	"runtime"
	"syscall"
	"time"
)

// syscall.TCP_KEEPINTVL and syscall.TCP_KEEPCNT might be missing on some darwin architectures.
const (
	sysTCP_KEEPINTVL = 0x101
	sysTCP_KEEPCNT   = 0x102
)

func setKeepAliveIdle(fd *netFD, d time.Duration) error {

// duplicate file descriptors.
func dupCloseOnExecOld(fd int) (int, string, error) {
	return -1, "dup", syscall.ENOSYS
}

// Fchdir wraps syscall.Fchdir.
func (fd *FD) Fchdir() error {
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()
	return syscall.Chdir(fd.Path)
}

// ReadDir wraps syscall.ReadDir.
// We treat this like an ordinary system call rather than a call
// that tries to fill the buffer.

	var grp _C_struct_group
	var found bool

	err := retryWithBuffer(groupBuffer, func(buf []byte) syscall.Errno {
		var errno syscall.Errno
		grp, found, errno = _C_getgrgid_r(_C_gid_t(gid),
			(*_C_char)(unsafe.Pointer(&buf[0])), _C_size_t(len(buf)))
		return syscall.Errno(errno)
	})
	if err == syscall.ENOENT || (err == nil && !found) {
		return nil, UnknownGroupIdError(strconv.Itoa(gid))
	}
	if err != nil {

//go:build (unix && !linux) || (js && wasm) || wasip1 || windows

package os

import "syscall"

func ensurePidfd(sysAttr *syscall.SysProcAttr) *syscall.SysProcAttr {
	return sysAttr
}

func getPidfd(_ *syscall.SysProcAttr) (uintptr, bool) {
	return 0, false
}

func pidfdFind(_ int) (uintptr, error) {
	return 0, syscall.ENOSYS
}

func (p *Process) pidfdRelease() {}

type ProcAttr struct {
	Dir   string
	Env   []string
	Files []uintptr
	Sys   *SysProcAttr
}

type SysProcAttr struct {
}

func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {
	return 0, 0, ENOSYS
}

func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno) {
	return 0, 0, ENOSYS
}

func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno) {

	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPINTVL, secs)
	runtime.KeepAlive(fd)
	return wrapSyscallError("setsockopt", err)
}

func setKeepAliveCount(fd *netFD, n int) error {
	if n == 0 {
		n = defaultTCPKeepAliveCount
	} else if n < 0 {
		return nil
	}

	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPCNT, n)
	runtime.KeepAlive(fd)