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Edit: /opt/golang/1.22.0/src/cmd/vendor/golang.org/x/sys/unix/syscall_dragonfly_amd64.go

// Copyright 2009 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.

//go:build amd64 && dragonfly

package unix

import (
	"syscall"
	"unsafe"
)

func setTimespec(sec, nsec int64) Timespec {
	return Timespec{Sec: sec, Nsec: nsec}
}

func setTimeval(sec, usec int64) Timeval {
	return Timeval{Sec: sec, Usec: usec}
}

func SetKevent(k *Kevent_t, fd, mode, flags int) {
	k.Ident = uint64(fd)
	k.Filter = int16(mode)
	k.Flags = uint16(flags)
}

func (iov *Iovec) SetLen(length int) {
	iov.Len = uint64(length)
}

func (msghdr *Msghdr) SetControllen(length int) {
	msghdr.Controllen = uint32(length)
}

func (msghdr *Msghdr) SetIovlen(length int) {
	msghdr.Iovlen = int32(length)
}

func (cmsg *Cmsghdr) SetLen(length int) {
	cmsg.Len = uint32(length)
}

func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
	var writtenOut uint64 = 0
	_, _, e1 := Syscall9(SYS_SENDFILE, uintptr(infd), uintptr(outfd), uintptr(*offset), uintptr(count), 0, uintptr(unsafe.Pointer(&writtenOut)), 0, 0, 0)

written = int(writtenOut)

if e1 != 0 {
		err = e1
	}
	return
}

func Syscall9(num, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err syscall.Errno)

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