EFAULT    = C.EFAULT
	EBUSY     = C.EBUSY
	EAGAIN    = C.EAGAIN
	ETIMEDOUT = C.ETIMEDOUT

	O_WRONLY   = C.O_WRONLY
	O_NONBLOCK = C.O_NONBLOCK
	O_CREAT    = C.O_CREAT
	O_TRUNC    = C.O_TRUNC
	O_CLOEXEC  = C.O_CLOEXEC

	PROT_NONE  = C.PROT_NONE
	PROT_READ  = C.PROT_READ
	PROT_WRITE = C.PROT_WRITE
	PROT_EXEC  = C.PROT_EXEC

	MAP_ANON    = C.MAP_ANON
	MAP_PRIVATE = C.MAP_PRIVATE
	MAP_FIXED   = C.MAP_FIXED

#include <pthread.h>
#include <signal.h>
*/
import "C"

const (
	EINTR     = C.EINTR
	EFAULT    = C.EFAULT
	EAGAIN    = C.EAGAIN
	ETIMEDOUT = C.ETIMEDOUT

	O_NONBLOCK = C.O_NONBLOCK
	O_CLOEXEC  = C.O_CLOEXEC

	PROT_NONE  = C.PROT_NONE
	PROT_READ  = C.PROT_READ
	PROT_WRITE = C.PROT_WRITE
	PROT_EXEC  = C.PROT_EXEC

	MAP_ANON    = C.MAP_ANON
	MAP_PRIVATE = C.MAP_PRIVATE
	MAP_FIXED   = C.MAP_FIXED

// Pipe returns a connected pair of Files; reads from r return bytes written to w.
// It returns the files and an error, if any.
func Pipe() (r *File, w *File, err error) {
	var p [2]int

	e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC)
	if e != nil {
		return nil, nil, NewSyscallError("pipe2", e)
	}

	return newFile(p[0], "|0", kindPipe, false), newFile(p[1], "|1", kindPipe, false), nil

*/
import "C"

const (
	EINTR  = C.EINTR
	EFAULT = C.EFAULT
	EAGAIN = C.EAGAIN

	O_WRONLY   = C.O_WRONLY
	O_NONBLOCK = C.O_NONBLOCK
	O_CREAT    = C.O_CREAT
	O_TRUNC    = C.O_TRUNC
	O_CLOEXEC  = C.O_CLOEXEC

	PROT_NONE  = C.PROT_NONE
	PROT_READ  = C.PROT_READ
	PROT_WRITE = C.PROT_WRITE
	PROT_EXEC  = C.PROT_EXEC

	MAP_ANON    = C.MAP_ANON
	MAP_PRIVATE = C.MAP_PRIVATE
	MAP_FIXED   = C.MAP_FIXED

	FORK_WAITPID   = C.FORK_WAITPID

	MAXHOSTNAMELEN = C.MAXHOSTNAMELEN

	O_WRONLY   = C.O_WRONLY
	O_NONBLOCK = C.O_NONBLOCK
	O_CREAT    = C.O_CREAT
	O_TRUNC    = C.O_TRUNC
	O_CLOEXEC  = C.O_CLOEXEC

	POLLIN  = C.POLLIN
	POLLOUT = C.POLLOUT
	POLLHUP = C.POLLHUP
	POLLERR = C.POLLERR

	PORT_SOURCE_FD    = C.PORT_SOURCE_FD
	PORT_SOURCE_ALERT = C.PORT_SOURCE_ALERT

const (
	EINTR     = C.EINTR
	EFAULT    = C.EFAULT
	EAGAIN    = C.EAGAIN
	ETIMEDOUT = C.ETIMEDOUT

	O_WRONLY   = C.O_WRONLY
	O_NONBLOCK = C.O_NONBLOCK
	O_CREAT    = C.O_CREAT
	O_TRUNC    = C.O_TRUNC
	O_CLOEXEC  = C.O_CLOEXEC

	PROT_NONE  = C.PROT_NONE
	PROT_READ  = C.PROT_READ
	PROT_WRITE = C.PROT_WRITE
	PROT_EXEC  = C.PROT_EXEC

	MAP_ANON    = C.MAP_ANON
	MAP_SHARED  = C.MAP_SHARED
	MAP_PRIVATE = C.MAP_PRIVATE

	if pipe < nextfd {
		if runtime.GOOS == "netbsd" || (runtime.GOOS == "openbsd" && runtime.GOARCH == "mips64") {
			_, _, err1 = RawSyscall(_SYS_DUP3, uintptr(pipe), uintptr(nextfd), O_CLOEXEC)
		} else if runtime.GOOS == "dragonfly" {
			_, _, err1 = RawSyscall(SYS_FCNTL, uintptr(pipe), _F_DUP2FD_CLOEXEC, uintptr(nextfd))
		} else {
			_, _, err1 = RawSyscall(SYS_DUP2, uintptr(pipe), uintptr(nextfd), 0)

	// so that pass 2 won't stomp on an fd it needs later.
	if pipe < nextfd {
		if runtime.GOOS == "openbsd" {
			_, _, err1 = rawSyscall(dupTrampoline, uintptr(pipe), uintptr(nextfd), O_CLOEXEC)
		} else {
			_, _, err1 = rawSyscall(dupTrampoline, uintptr(pipe), uintptr(nextfd), 0)
			if err1 != 0 {
				goto childerror
			}

// 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 nil, e
	}

)

const (
	O_RDONLY = 0
	O_WRONLY = 1
	O_RDWR   = 2

	O_CREAT  = 0100
	O_CREATE = O_CREAT
	O_TRUNC  = 01000
	O_APPEND = 02000
	O_EXCL   = 0200
	O_SYNC   = 010000

	O_CLOEXEC = 0
)

const (
	F_DUPFD   = 0
	F_GETFD   = 1
	F_SETFD   = 2
	F_GETFL   = 3
	F_SETFL   = 4
	F_GETOWN  = 5
	F_SETOWN  = 6
	F_GETLK   = 7
	F_SETLK   = 8
	F_SETLKW  = 9