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//go:build netbsd
// +build netbsd
package pty
import (
"errors"
"os"
"syscall"
"unsafe"
)
func open() (pty, tty *os.File, err error) {
p, err := os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
if err != nil {
return nil, nil, err
}
// In case of error after this point, make sure we close the ptmx fd.
defer func() {
if err != nil {
_ = p.Close() // Best effort.
}
}()
sname, err := ptsname(p)
if err != nil {
return nil, nil, err
}
if err := grantpt(p); err != nil {
return nil, nil, err
}
// In NetBSD unlockpt() does nothing, so it isn't called here.
t, err := os.OpenFile(sname, os.O_RDWR|syscall.O_NOCTTY, 0)
if err != nil {
return nil, nil, err
}
return p, t, nil
}
func ptsname(f *os.File) (string, error) {
/*
* from ptsname(3): The ptsname() function is equivalent to:
* struct ptmget pm;
* ioctl(fd, TIOCPTSNAME, &pm) == -1 ? NULL : pm.sn;
*/
var ptm ptmget
if err := ioctl(f, uintptr(ioctl_TIOCPTSNAME), uintptr(unsafe.Pointer(&ptm))); err != nil {
return "", err
}
name := make([]byte, len(ptm.Sn))
for i, c := range ptm.Sn {
name[i] = byte(c)
if c == 0 {
return string(name[:i]), nil
}
}
return "", errors.New("TIOCPTSNAME string not NUL-terminated")
}
func grantpt(f *os.File) error {
/*
* from grantpt(3): Calling grantpt() is equivalent to:
* ioctl(fd, TIOCGRANTPT, 0);
*/
return ioctl(f, uintptr(ioctl_TIOCGRANTPT), 0)
}
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