// the runtime's write function, since that adds the framing that
// reports the emulated time.

//go:linkname runtimeWrite runtime.write
func runtimeWrite(fd uintptr, p unsafe.Pointer, n int32) int32

func faketimeWrite(fd int, p []byte) int {
	var pp *byte
	if len(p) > 0 {
		pp = &p[0]
	}
	return int(runtimeWrite(uintptr(fd), unsafe.Pointer(pp), int32(len(p))))

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

//go:build !faketime

package syscall

const faketime = false

func faketimeWrite(fd int, p []byte) int {
	// This should never be called since faketime is false.
	panic("not implemented")

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

//go:build faketime && !windows

// Faketime isn't currently supported on Windows. This would require
// modifying syscall.Write to call syscall.faketimeWrite,
// translating the Stdout and Stderr handles into FDs 1 and 2.
// (See CL 192739 PS 3.)

package runtime

import "unsafe"

// faketime is the simulated time in nanoseconds since 1970 for the
// playground.

	return int(n)
}

func Read(fd int, p []byte) (n int, err error) {
	return Pread(fd, p, -1)
}

func Write(fd int, p []byte) (n int, err error) {
	if faketime && (fd == 1 || fd == 2) {
		n = faketimeWrite(fd, p)
		if n < 0 {
			return 0, ErrorString("error")
		}
		return n, nil
	}

	return Pwrite(fd, p, -1)
}

var ioSync int64

//sys	fd2path(fd int, buf []byte) (err error)

	if err != nil {
		return 0, err
	}

	if f.seeked {
		n, err := Pwrite(fd, b, f.pos)
		f.pos += int64(n)
		return n, err
	}

	if faketime && (fd == 1 || fd == 2) {
		n := faketimeWrite(fd, b)
		if n < 0 {
			return 0, errnoErr(Errno(-n))
		}
		return n, nil
	}

	buf := uint8Array.New(len(b))
	js.CopyBytesToJS(buf, b)
	n, err := fsCall("write", fd, buf, 0, len(b), nil)

	}
	return
}

func Write(fd int, p []byte) (n int, err error) {
	if race.Enabled {
		race.ReleaseMerge(unsafe.Pointer(&ioSync))
	}
	if faketime && (fd == 1 || fd == 2) {
		n = faketimeWrite(fd, p)
		if n < 0 {
			n, err = 0, errnoErr(Errno(-n))
		}
	} else {
		n, err = write(fd, p)
	}
	if race.Enabled && n > 0 {
		race.ReadRange(unsafe.Pointer(&p[0]), n)
	}