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Kernel/TTY: Implement TIOCGPTN ioctl for MasterPTY

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This ioctl operation will allow userspace to determine the index number
of a MasterPTY after opening /dev/ptmx and actually getting an internal
file descriptor of MasterPTY.
This commit is contained in:
Liav A 2022-02-15 21:31:17 +02:00 • committed by Andreas Kling
parent e508073168
commit 5ffe2f117c
2 changed files with 12 additions and 2 deletions
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12
Kernel/TTY/MasterPTY.cpp
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@ -125,9 +125,17 @@ ErrorOr<void> MasterPTY::ioctl(OpenFileDescription& description, unsigned reques
TRY(Process::current().require_promise(Pledge::tty));
if (!m_slave)
return EIO;
if (request == TIOCSWINSZ || request == TIOCGPGRP)
switch (request) {
case TIOCGPTN: {
int master_pty_index = index();
return copy_to_user(static_ptr_cast<int*>(arg), &master_pty_index);
}
case TIOCSWINSZ:
case TIOCGPGRP:
return m_slave->ioctl(description, request, arg);
return EINVAL;
default:
return EINVAL;
}
}
ErrorOr<NonnullOwnPtr<KString>> MasterPTY::pseudo_path(const OpenFileDescription&) const