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, 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
	}

		return false
	}
	return true
}

func GetFd(f fs.File) (uintptr, error) {
	if fdable, ok := f.(interface{ Fd() uintptr }); ok {
		return fdable.Fd(), nil
	}

	return 0, fmt.Errorf("unable to get fd")
}

/// mostly copy pasted from spire below:

// regexes listed here have to exclusively match a cgroup path

000002e0  cf 9b ae c3 e0 2f d4 80  f8 be 4f 9d 87 53 fd 53  |...../....O..S.S|
000002f0  b6 a2 cf b9 8e 56 85 39  16 03 03 00 bc 63 23 39  |.....V.9.....c#9|
00000300  de e9 93 fb f0 9b 64 b6  5e 7c a0 47 f6 b3 99 16  |......d.^|.G....|
00000310  1c 68 f3 f6 3f bd a0 fc  80 09 6d 95 9a 17 65 e0  |.h..?.....m...e.|
00000320  c2 ee fa cf fd af d8 05  5c 17 f1 1f a3 1c f2 47  |........\......G|

		importpaths[pd.PackagePath()] = struct{}{}
		var fd coverage.FuncDesc
		nf := pd.NumFuncs()
		for fnIdx := uint32(0); fnIdx < nf; fnIdx++ {
			if err := pd.ReadFunc(fnIdx, &fd); err != nil {
				return fmt.Errorf("reading meta-data file %s: %v",
					p.MetaFile, err)
			}
			key := pkfunc{pk: pkIdx, fcn: fnIdx}
			counters, haveCounters := pmm[key]
			for i := 0; i < len(fd.Units); i++ {
				u := fd.Units[i]

00000210  10 79 08 d4 ce 9e e2 cb  0b 86 a4 b1 80 e4 1b ac  |.y..............|
00000220  71 15 fd 16 5b aa 01 c2  7b e3 c2 84 01 c0 f6 04  |q...[...{.......|
00000230  a7 31 2b ec f2 50 bf 5a  07 6f b8 03 9f d2 c6 ad  |.1+..P.Z.o......|
00000240  73 18 81 f5 fd 9a 5a b2  bc 9f 85 94 9f f6 da da  |s.....Z.........|
00000250  dd 56 bc 66 17 03 03 00  35 9f 7e 2e 02 66 bb ac  |.V.f....5.~..f..|

00000140  5e dd 95 5a ba e4 5a 68  64 a6 44 f5 a2 3a d6 30  |^..Z..Zhd.D..:.0|
00000150  7e b1 27 b1 79 44 ef 79  95 51 75 02 24 2c ea ab  |~.'.yD.y.Qu.$,..|
00000160  d5 e1 fd aa 81 55 89 cf  bc 9c 11 2b 0b 4a 99 9f  |.....U.....+.J..|
00000170  50 93 68 a1 c8 79 3d d8  aa d8 54 e3 d5 1a 97 90  |P.h..y=...T.....|
00000180  33 87 a9 70 1d 9d ba 78  d0 87 8a 98 6f 1b 1e b0  |3..p...x....o...|

000002d0  c2 40 cd e6 5a 6e d3 b5  17 f0 4d c4 34 8f 2a 28  |******@****.***....M.4.*(|
000002e0  4d ce 93 d5 eb 7e 0a d2  57 0a 98 cf ac 48 ee a8  |M....~..W....H..|
000002f0  8a bd ec c2 d7 d9 39 af  e2 a0 9f b2 fd d1 4e 96  |......9.......N.|
00000300  fa fd 34 f7 a4 3e 3d 31  9a f6 a2 a7 97 a3 43 17  |..4..>=1......C.|
00000310  03 03 00 a4 cf 0d e1 8d  b7 e4 1a c0 79 0d 7e d9  |............y.~.|

000000d0  ec b1 19 dd 68 b5 bd c4  bb ba 63 9a e4 c9 24 af  |....h.....c...$.|
000000e0  88 13 65 11 bf ea d9 07  e9 46 fd 5b 60 ce 57 46  |..e......F.[`.WF|
000000f0  8b a9 bd c6 58 1a 3b bd  5e fb 0f 46 ec fc 8b 2c  |....X.;.^..F...,|
00000100  ea a7 19 06 6a e5 6f 10  7a 27 04 6b aa a4 2c f4  |....j.o.z'.k..,.|
00000110  ef 3b e8 8a 51 88 fd e0  ae 33 b1 4c b3 04 5e 91  |.;..Q....3.L..^.|

00000030  eb c2 45 a4 75 12 e6 1a  16 fc d8 bd d4 f7 fd 6f  |..E.u..........o|
00000040  f3 99 ca d6 41 15 03 03  00 40 00 00 00 00 00 00  |....A....@......|
00000050  00 00 00 00 00 00 00 00  00 00 8c 80 a8 e9 95 4c  |...............L|
00000060  c9 fa 4d 9d 06 e5 d8 70  5f fa a9 44 24 15 f4 47  |..M....p_..D$..G|
00000070  5a 0a 24 55 a7 6a 04 1c  2a 39 80 fd 08 47 d7 08  |Z.$U.j..*9...G..|

00000250  10 77 6f d1 96 86 84 63  fd 27 8e b9 54 da 4b b5  |.wo....c.'..T.K.|
00000260  56 f0 50 8a aa c7 e1 b3  cb 9c 36 9e ec 38 31 39  |V.P.......6..819|
00000270  78 ec ea 34 8a 87 cf 6b  34 fd 5e 81 92 81 61 f1  |x..4...k4.^...a.|
00000280  88 e7 50 62 2e 58 0b d9  b9 ca f3 ed 79 a9 9a 01  |..Pb.X......y...|
00000290  80 9d 7f 84 ae de fb 51  ac 0f 6b b9 76 fd 68 d4  |.......Q..k.v.h.|