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51 lines
1014 B
51 lines
1014 B
package pty |
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import ( |
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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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p, err := os.OpenFile("/dev/ptmx", 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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// 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 := 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|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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return p, t, nil |
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} |
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func ptsname(f *os.File) (string, error) { |
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var n _C_uint |
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err := ioctl(f.Fd(), syscall.TIOCGPTN, uintptr(unsafe.Pointer(&n))) |
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if err != nil { |
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return "", err |
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} |
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return "/dev/pts/" + strconv.Itoa(int(n)), nil |
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} |
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func unlockpt(f *os.File) error { |
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var u _C_int |
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// use TIOCSPTLCK with a zero valued arg to clear the slave pty lock |
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return ioctl(f.Fd(), syscall.TIOCSPTLCK, uintptr(unsafe.Pointer(&u))) |
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}
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