mirror of https://gogs.blitter.com/RLabs/xs
153 lines
3.3 KiB
Go
153 lines
3.3 KiB
Go
//go:build solaris
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// +build solaris
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package pty
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/* based on:
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http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libc/port/gen/pt.c
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*/
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import (
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"errors"
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"os"
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"strconv"
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"syscall"
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"unsafe"
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)
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func open() (pty, tty *os.File, err error) {
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ptmxfd, err := syscall.Open("/dev/ptmx", syscall.O_RDWR|syscall.O_NOCTTY, 0)
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if err != nil {
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return nil, nil, err
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}
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p := os.NewFile(uintptr(ptmxfd), "/dev/ptmx")
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// In case of error after this point, make sure we close the ptmx fd.
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defer func() {
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if err != nil {
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_ = p.Close() // Best effort.
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}
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}()
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sname, err := ptsname(p)
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if err != nil {
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return nil, nil, err
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}
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if err := grantpt(p); err != nil {
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return nil, nil, err
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}
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if err := unlockpt(p); err != nil {
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return nil, nil, err
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}
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ptsfd, err := syscall.Open(sname, os.O_RDWR|syscall.O_NOCTTY, 0)
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if err != nil {
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return nil, nil, err
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}
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t := os.NewFile(uintptr(ptsfd), sname)
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// In case of error after this point, make sure we close the pts fd.
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defer func() {
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if err != nil {
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_ = t.Close() // Best effort.
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}
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}()
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// pushing terminal driver STREAMS modules as per pts(7)
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for _, mod := range []string{"ptem", "ldterm", "ttcompat"} {
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if err := streamsPush(t, mod); err != nil {
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return nil, nil, err
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}
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}
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return p, t, nil
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}
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func ptsname(f *os.File) (string, error) {
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dev, err := ptsdev(f.Fd())
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if err != nil {
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return "", err
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}
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fn := "/dev/pts/" + strconv.FormatInt(int64(dev), 10)
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if err := syscall.Access(fn, 0); err != nil {
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return "", err
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}
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return fn, nil
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}
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func unlockpt(f *os.File) error {
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istr := strioctl{
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icCmd: UNLKPT,
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icTimeout: 0,
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icLen: 0,
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icDP: nil,
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}
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return ioctl(f.Fd(), I_STR, uintptr(unsafe.Pointer(&istr)))
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}
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func minor(x uint64) uint64 { return x & 0377 }
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func ptsdev(fd uintptr) (uint64, error) {
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istr := strioctl{
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icCmd: ISPTM,
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icTimeout: 0,
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icLen: 0,
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icDP: nil,
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}
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if err := ioctl(fd, I_STR, uintptr(unsafe.Pointer(&istr))); err != nil {
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return 0, err
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}
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var status syscall.Stat_t
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if err := syscall.Fstat(int(fd), &status); err != nil {
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return 0, err
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}
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return uint64(minor(status.Rdev)), nil
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}
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type ptOwn struct {
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rUID int32
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rGID int32
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}
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func grantpt(f *os.File) error {
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if _, err := ptsdev(f.Fd()); err != nil {
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return err
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}
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pto := ptOwn{
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rUID: int32(os.Getuid()),
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// XXX should first attempt to get gid of DEFAULT_TTY_GROUP="tty"
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rGID: int32(os.Getgid()),
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}
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istr := strioctl{
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icCmd: OWNERPT,
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icTimeout: 0,
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icLen: int32(unsafe.Sizeof(strioctl{})),
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icDP: unsafe.Pointer(&pto),
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}
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if err := ioctl(f.Fd(), I_STR, uintptr(unsafe.Pointer(&istr))); err != nil {
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return errors.New("access denied")
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}
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return nil
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}
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// streamsPush pushes STREAMS modules if not already done so.
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func streamsPush(f *os.File, mod string) error {
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buf := []byte(mod)
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// XXX I_FIND is not returning an error when the module
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// is already pushed even though truss reports a return
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// value of 1. A bug in the Go Solaris syscall interface?
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// XXX without this we are at risk of the issue
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// https://www.illumos.org/issues/9042
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// but since we are not using libc or XPG4.2, we should not be
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// double-pushing modules
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if err := ioctl(f.Fd(), I_FIND, uintptr(unsafe.Pointer(&buf[0]))); err != nil {
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return nil
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}
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return ioctl(f.Fd(), I_PUSH, uintptr(unsafe.Pointer(&buf[0])))
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}
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