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

package unix

import (
	"syscall"
	"unsafe"
)

// Note that pgid should really be pid_t, however _C_int (aka int32) is
// generally equivalent.

func Tcsetpgrp(fd int, pgid int32) (err error) {

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

//go:build darwin || dragonfly || freebsd || netbsd || openbsd

package syscall

import (
	"unsafe"
)

// pgid should really be pid_t, however _C_int (aka int32) is generally
// equivalent.

func Tcgetpgrp(fd int) (pgid int32, err error) {
	if err := ioctlPtr(fd, TIOCGPGRP, unsafe.Pointer(&pgid)); err != nil {
		return -1, err
	}
	return pgid, nil

package unix

import (
	"syscall"
	"unsafe"
)

//go:linkname ioctlPtr syscall.ioctlPtr
func ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error)

// Note that pgid should really be pid_t, however _C_int (aka int32) is
// generally equivalent.

func Tcsetpgrp(fd int, pgid int32) (err error) {
	return ioctlPtr(fd, syscall.TIOCSPGRP, unsafe.Pointer(&pgid))

		pgrp := int32(syscall.Getpgrp()) // assume that pid_t is int32
		if err := unix.Tcsetpgrp(ptyFD, pgrp); err != nil {
			return fmt.Errorf("error setting tty process group: %w", err)
		}

		// Give the kernel time to potentially wake readers and have
		// them return EINTR (darwin does this).
		time.Sleep(pause)

		// Give TTY back.
		pid := int32(cmd.Process.Pid) // assume that pid_t is int32

	childTID   uint64 // Where to store child TID, in child's memory (pid_t *)
	parentTID  uint64 // Where to store child TID, in parent's memory (pid_t *)
	exitSignal uint64 // Signal to deliver to parent on child termination
	stack      uint64 // Pointer to lowest byte of stack
	stackSize  uint64 // Size of stack
	tls        uint64 // Location of new TLS
	setTID     uint64 // Pointer to a pid_t array (since Linux 5.5)