//go:build unix

package os

// supportsCloseOnExec reports whether the platform supports the
// O_CLOEXEC flag.
// On Darwin, the O_CLOEXEC flag was introduced in OS X 10.7 (Darwin 11.0.0).
// See https://support.apple.com/kb/HT1633.
// On FreeBSD, the O_CLOEXEC flag was introduced in version 8.3.

//go:build dragonfly || freebsd || linux || netbsd || openbsd || solaris

package syscall

import "sync"

// forkExecPipe atomically opens a pipe with O_CLOEXEC set on both file
// descriptors.
func forkExecPipe(p []int) error {
	return Pipe2(p, O_CLOEXEC)
}

var (
	// Guard the forking variable.
	forkingLock sync.Mutex
	// Number of goroutines currently forking, and thus the

*/

package runtime

/*
#include <ucontext.h>
#include <fcntl.h>
#include <asm/signal.h>
*/
import "C"

const (
	O_RDONLY    = C.O_RDONLY
	O_NONBLOCK  = C.O_NONBLOCK
	O_CLOEXEC   = C.O_CLOEXEC
	SA_RESTORER = C.SA_RESTORER
)

type Usigset C.__sigset_t
type Fpxreg C.struct__libc_fpxreg
type Xmmreg C.struct__libc_xmmreg
type Fpstate C.struct__libc_fpstate
type Fpxreg1 C.struct__fpxreg

#define	_SYS_TYPES_H	// avoid inclusion of sys/types.h
#include <asm/ucontext.h>
#include <asm-generic/fcntl.h>
*/
import "C"

const (
	O_RDONLY    = C.O_RDONLY
	O_CLOEXEC   = C.O_CLOEXEC
	SA_RESTORER = 0 // unused
)

type Usigset C.__sigset_t

// types used in sigcontext
type Ptregs C.struct_pt_regs
type Gregset C.elf_gregset_t
type FPregset C.elf_fpregset_t

	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

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build wasip1

package os

// supportsCloseOnExec reports whether the platform supports the
// O_CLOEXEC flag.

*/
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

package plan9

// Plan 9 Constants

// Open modes
const (
	O_RDONLY  = 0
	O_WRONLY  = 1
	O_RDWR    = 2
	O_TRUNC   = 16
	O_CLOEXEC = 32
	O_EXCL    = 0x1000
)

// Rfork flags
const (
	RFNAMEG  = 1 << 0
	RFENVG   = 1 << 1
	RFFDG    = 1 << 2
	RFNOTEG  = 1 << 3
	RFPROC   = 1 << 4
	RFMEM    = 1 << 5
	RFNOWAIT = 1 << 6
	RFCNAMEG = 1 << 10
	RFCENVG  = 1 << 11
	RFCFDG   = 1 << 12
	RFREND   = 1 << 13