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65 lines
1.2 KiB
65 lines
1.2 KiB
package pty |
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import ( |
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"errors" |
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"os" |
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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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pFD, err := syscall.Open("/dev/ptmx", syscall.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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p := os.NewFile(uintptr(pFD), "/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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t, err := os.OpenFile(sname, os.O_RDWR, 0) |
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if err != nil { |
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return nil, nil, err |
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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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n := make([]byte, _IOC_PARM_LEN(syscall.TIOCPTYGNAME)) |
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err := ioctl(f.Fd(), syscall.TIOCPTYGNAME, uintptr(unsafe.Pointer(&n[0]))) |
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if err != nil { |
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return "", err |
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} |
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for i, c := range n { |
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if c == 0 { |
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return string(n[:i]), nil |
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} |
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} |
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return "", errors.New("TIOCPTYGNAME string not NUL-terminated") |
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} |
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func grantpt(f *os.File) error { |
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return ioctl(f.Fd(), syscall.TIOCPTYGRANT, 0) |
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} |
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func unlockpt(f *os.File) error { |
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return ioctl(f.Fd(), syscall.TIOCPTYUNLK, 0) |
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}
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