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

//go:build unix

package unix

const (
	R_OK = 0x4
	W_OK = 0x2
	X_OK = 0x1

	// NoFollowErrno is the error returned from open/openat called with
	// O_NOFOLLOW flag, when the trailing component (basename) of the path
	// is a symbolic link.
	NoFollowErrno = noFollowErrno

import _ "unsafe"

// used by os
//go:linkname closedir
//go:linkname readdir_r

// used by internal/poll
//go:linkname fdopendir

// used by internal/syscall/unix
//go:linkname unlinkat
//go:linkname openat
//go:linkname fstatat

// used by cmd/link
//go:linkname msync

func rawSyscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)

//go:cgo_import_dynamic libc_fstatat fstatat "libc.so"
//go:cgo_import_dynamic libc_openat openat "libc.so"
//go:cgo_import_dynamic libc_unlinkat unlinkat "libc.so"
//go:cgo_import_dynamic libc_uname uname "libc.so"

const (
	AT_REMOVEDIR        = 0x1
	AT_SYMLINK_NOFOLLOW = 0x1000

	UTIME_OMIT = -0x2

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

//go:build openbsd && !mips64

package syscall

import _ "unsafe"

// used by internal/syscall/unix
//go:linkname unlinkat
//go:linkname openat
//go:linkname fstatat

//   - android: see linux
//   - darwin: https://github.com/apple/darwin-xnu/blob/main/bsd/man/man2/open.2
//   - hurd: who knows if it works at all (https://www.gnu.org/software/hurd/open_issues/open_symlink.html)
//   - illumos: https://illumos.org/man/2/open
//   - ios: see darwin
//   - linux: https://man7.org/linux/man-pages/man2/openat.2.html

	// fdopendir expects to take control of its argument.
	// Just Dup'ing the file descriptor is not enough, as the
	// result shares underlying state. Use openat to make a really
	// new file descriptor referring to the same directory.
	fd2, err := openat(fd, ".", O_RDONLY, 0)
	if err != nil {
		return 0, err
	}
	d, err := fdopendir(fd2)
	if err != nil {
		Close(fd2)
		return 0, err
	}

//sysnb getentropy(p []byte) (err error)
//sys   fstatat(fd int, path string, stat *Stat_t, flags int) (err error)
//sys   unlinkat(fd int, path string, flags int) (err error)

// we are going to (try to) remove the file.
// The contents of this file are not relevant for test caching.
func openDirAt(dirfd int, name string) (*File, error) {
	var r int
	for {
		var e error
		r, e = unix.Openat(dirfd, name, O_RDONLY|syscall.O_CLOEXEC|syscall.O_DIRECTORY|syscall.O_NOFOLLOW, 0)
		if e == nil {
			break
		}

		// See comment in openFileNolog.
		if e == syscall.EINTR {
			continue
		}

	return Mknodat(_AT_FDCWD, path, mode, dev)
}

func Open(path string, mode int, perm uint32) (fd int, err error) {
	return openat(_AT_FDCWD, path, mode|O_LARGEFILE, perm)
}

//sys	openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)

func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
	return openat(dirfd, path, flags|O_LARGEFILE, mode)
}

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

TEXT ·get_openatAddr(SB), NOSPLIT|NOFRAME, $0-8
	MOVD $·openat(SB), R8
	MOVD R8, ret+0(FP)
	RET

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

TEXT ·get_openat2Addr(SB), NOSPLIT|NOFRAME, $0-8
	MOVD $·openat2(SB), R8
	MOVD R8, ret+0(FP)
	RET

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