POLLPRI                         = 0x0010
	POLLERR                         = 0x0020
	POLLHUP                         = 0x0040
	POLLNVAL                        = 0x0080
	PROT_READ                       = 0x1 // mmap - page can be read
	PROT_WRITE                      = 0x2 // page can be written
	PROT_NONE                       = 0x4 // can't be accessed
	PROT_EXEC                       = 0x8 // can be executed

   *       channel have their own file descriptors. Generally this only happens when both channels
   *       are files or sockets. This performs zero copies - the bytes never enter userspace.
   *   <li>Use mmap(2) or equivalent. Requires that either the input channel or the output channel
   *       have file descriptors. Bytes are copied from the file into a kernel buffer, then directly

	SYS_PWRITE                   = 476 // { ssize_t pwrite(int fd, const void *buf, size_t nbyte, off_t offset); }
	SYS_MMAP                     = 477 // { caddr_t mmap(caddr_t addr, size_t len, int prot, int flags, int fd, off_t pos); }
	SYS_LSEEK                    = 478 // { off_t lseek(int fd, off_t offset, int whence); }

	SYS_PWRITE                   = 476 // { ssize_t pwrite(int fd, const void *buf, size_t nbyte, off_t offset); }
	SYS_MMAP                     = 477 // { caddr_t mmap(caddr_t addr, size_t len, int prot, int flags, int fd, off_t pos); }
	SYS_LSEEK                    = 478 // { off_t lseek(int fd, off_t offset, int whence); }

	SYS_PWRITE                   = 476 // { ssize_t pwrite(int fd, const void *buf, size_t nbyte, off_t offset); }
	SYS_MMAP                     = 477 // { caddr_t mmap(caddr_t addr, size_t len, int prot, int flags, int fd, off_t pos); }
	SYS_LSEEK                    = 478 // { off_t lseek(int fd, off_t offset, int whence); }

		// try using mincore to detect the physical page size.
		// mincore should return EINVAL when address is not a multiple of system page size.
		const size = 256 << 10 // size of memory region to allocate
		p, err := mmap(nil, size, _PROT_READ|_PROT_WRITE, _MAP_ANON|_MAP_PRIVATE, -1, 0)
		if err != 0 {
			return
		}
		var n uintptr
		for n = 4 << 10; n < size; n <<= 1 {

	r0, e1 := calllseek(fd, offset, whence)
	off = int64(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) {
	r0, e1 := callmmap64(addr, length, prot, flags, fd, offset)
	xaddr = uintptr(r0)
	if e1 != 0 {
		err = errnoErr(e1)

	n = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) {
	r0, _, e1 := Syscall9(SYS_MMAP, uintptr(addr), uintptr(length), uintptr(prot), uintptr(flag), uintptr(fd), 0, uintptr(pos), 0, 0)

	n = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) {
	r0, _, e1 := Syscall9(SYS_MMAP, uintptr(addr), uintptr(length), uintptr(prot), uintptr(flag), uintptr(fd), 0, uintptr(pos), 0, 0)

	n = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) {