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291695431f
(*os.File).Fd() implicitly sets file descriptor into blocking mode [1], [2] We avoid that by calling (*os.File).SyscallConn instead. This method was added in go1.12 (released on 2019-02-25) [1]: https://pkg.go.dev/os#File.Fd [2]: https://cs.opensource.google/go/go/+/refs/tags/go1.20.3:src/os/file_unix.go;l=80-87
48 lines
987 B
Go
48 lines
987 B
Go
//go:build openbsd
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// +build openbsd
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package pty
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import (
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"os"
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"syscall"
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"unsafe"
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)
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func cInt8ToString(in []int8) string {
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var s []byte
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for _, v := range in {
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if v == 0 {
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break
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}
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s = append(s, byte(v))
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}
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return string(s)
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}
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func open() (pty, tty *os.File, err error) {
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/*
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* from ptm(4):
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* The PTMGET command allocates a free pseudo terminal, changes its
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* ownership to the caller, revokes the access privileges for all previous
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* users, opens the file descriptors for the pty and tty devices and
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* returns them to the caller in struct ptmget.
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*/
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p, err := os.OpenFile("/dev/ptm", os.O_RDWR|syscall.O_CLOEXEC, 0)
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if err != nil {
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return nil, nil, err
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}
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defer p.Close()
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var ptm ptmget
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if err := ioctl(p, uintptr(ioctl_PTMGET), uintptr(unsafe.Pointer(&ptm))); err != nil {
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return nil, nil, err
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}
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pty = os.NewFile(uintptr(ptm.Cfd), cInt8ToString(ptm.Cn[:]))
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tty = os.NewFile(uintptr(ptm.Sfd), cInt8ToString(ptm.Sn[:]))
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return pty, tty, nil
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}
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