func golang.org/x/sys/unix.sendfile

2 uses

	golang.org/x/sys/unix (current package)
		syscall_darwin.go#L380: 	err = sendfile(infd, outfd, *offset, &length, nil, 0)
		zsyscall_darwin_arm64.go#L781: func sendfile(infd int, outfd int, offset int64, len *int64, hdtr unsafe.Pointer, flags int) (err error) {