mirror of https://github.com/docker/cli.git
34 lines
773 B
Go
34 lines
773 B
Go
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 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.Fd(), 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), "/dev/ptm")
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tty = os.NewFile(uintptr(ptm.Sfd), "/dev/ptm")
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return pty, tty, nil
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}
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