// files like c:\pagefile.sys. Use FindFirstFile for such files.
	if err == windows.ERROR_SHARING_VIOLATION {
		var fd syscall.Win32finddata
		sh, err := syscall.FindFirstFile(namep, &fd)
		if err != nil {
			return nil, &PathError{Op: "FindFirstFile", Path: name, Err: err}
		}
		syscall.FindClose(sh)
		if fd.FileAttributes&syscall.FILE_ATTRIBUTE_REPARSE_POINT == 0 {

package poll

import "syscall"

// maxSendfileSize is the largest chunk size we ask the kernel to copy
// at a time.
const maxSendfileSize int = 4 << 20

// SendFile wraps the sendfile system call.
func SendFile(dstFD *FD, src int, remain int64) (written int64, err error, handled bool) {
	defer func() {
		TestHookDidSendFile(dstFD, src, written, err, handled)
	}()
	if err := dstFD.writeLock(); err != nil {
		return 0, err, false
	}

//go:cgo_import_dynamic _ _ "libsocket.so"

// maxSendfileSize is the largest chunk size we ask the kernel to copy
// at a time.
const maxSendfileSize int = 4 << 20

// SendFile wraps the sendfile system call.
func SendFile(dstFD *FD, src int, pos, remain int64) (written int64, err error, handled bool) {
	defer func() {
		TestHookDidSendFile(dstFD, src, written, err, handled)
	}()
	if err := dstFD.writeLock(); err != nil {
		return 0, err, false
	}

00000480  47 9f 1c 64 6e 80 ab 9d  51 92 8c 60 a2 88 c4 43  |G..dn...Q..`...C|
00000490  7d dc 29 64 45 83 a7 9c  2a 39 e9 bb 2a d9 f5 96  |}.)dE...*9..*...|
000004a0  4c fb fd 0d cc 0f 9b 48  f5 ee af 8f 7a 1c 39 3e  |L......H....z.9>|
000004b0  cf 23 15 c6 ab c3 f2 29  fd 6c 4f 17 6b d4 be 1a  |.#.....).lO.k...|
000004c0  23 6e 74 81 e5 e5 e8 c0  de 9b b0 ed d2 32 bc 2a  |#nt..........2.*|

00000370  9b ee 0b 22 7a 23 f4 b8  3e fd fe 99 13 9d 18 bc  |..."z#..>.......|
00000380  77 99 2f 90 21 a1 5f cc  9f 08 e2 75 44 2f bf 58  |w./.!._....uD/.X|
00000390  70 f2 95 b2 13 20 f3 ed  51 de e8 02 c6 ca 44 57  |p.... ..Q.....DW|
000003a0  eb 0b 9f 3e 61 f1 1a 6e  6b 13 f5 14 f3 43 19 f6  |...>a..nk....C..|
000003b0  7d 46 3a 73 49 2f fd 83  c3 68 c7 ba b4 e8 17 03  |}F:sI/...h......|

// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package poll

000000c0  68 8b 17 03 03 02 6d 16  c5 3b c2 80 85 49 51 1f  |h.....m..;...IQ.|
000000d0  4e 0e 8a 11 63 95 9b 83  46 a9 19 43 90 ee 55 ae  |N...c...F..C..U.|
000000e0  4f 09 ae cf fd 64 dd a9  c0 af 31 fd 95 29 20 9f  |O....d....1..) .|
000000f0  da d4 27 97 2c da da 2c  c8 e7 e5 c2 6b 24 5f dd  |..'.,..,....k$_.|
00000100  68 86 b1 9b 01 95 8a 78  bb 10 26 66 24 d4 59 df  |h......x..&f$.Y.|

00000020  78 63 03 dd 50 3e a4 27  20 21 bf 20 d9 93 9d f6  |xc..P>.' !. ....|
00000030  1f e8 0e 72 fc 64 e0 dd  8e ef b3 ea ff 5b ad 60  |...r.d.......[.`|
00000040  a5 f0 68 ff 7e 35 46 a4  28 71 31 fd cc a8 00 00  |..h.~5F.(q1.....|
00000050  11 ff 01 00 01 00 00 0b  00 04 03 00 01 02 00 17  |................|
00000060  00 00 16 03 03 02 59 0b  00 02 55 00 02 52 00 02  |......Y...U..R..|

00000020  93 78 6b f2 c6 70 70 1e  4d 8f 48 20 24 b3 17 46  |.xk..pp.M.H $..F|
00000030  37 c0 0f 79 af f4 48 43  17 6b ea df 6b 73 07 cf  |7..y..HC.k..ks..|
00000040  5f 95 c5 5c 8d b2 99 5c  fd 30 e5 1b 00 05 00 00  |_..\...\.0......|
00000050  09 ff 01 00 01 00 00 17  00 00 16 03 03 02 59 0b  |..............Y.|
00000060  00 02 55 00 02 52 00 02  4f 30 82 02 4b 30 82 01  |..U..R..O0..K0..|

000002d0  57 55 26 c5 46 f2 5d a1  f5 20 46 0d 63 fd 48 5a  |WU&.F.].. F.c.HZ|
000002e0  f3 65 90 8c 1a bd 59 6e  5f d1 5c b6 ee 33 49 12  |.e....Yn_.\..3I.|
000002f0  46 ec                                             |F.|
>>> Flow 4 (server to client)
00000000  14 03 01 00 01 01 16 03  01 00 30 b1 3c 7f c3 15  |..........0.<...|
00000010  e4 fe bc 1a ee 0d ec 28  ce b0 f7 fd a4 0a e4 79  |.......(.......y|