126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
#include "fs/devices/MasterPTY.h"
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#include "Pledge.h"
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#include "fs/devices/DeviceRegistry.h"
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#include "fs/devices/PTYMultiplexer.h"
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#include "fs/devpts/FileSystem.h"
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#include "memory/MemoryManager.h"
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#include "thread/Scheduler.h"
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Result<SharedPtr<VFS::Inode>> MasterPTY::create_pair(int index)
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{
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auto master = TRY(make_shared<MasterPTY>());
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auto slave = TRY(make_shared<SlavePTY>());
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auto name = TRY(String::format("%d"_sv, index));
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for (auto& fs : g_devpts_instances) { fs->root_inode()->add_entry(slave, name.chars()); }
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slave->m_name = move(name);
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master->m_metadata.mode = 0666;
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master->m_index = index;
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master->m_slave = slave;
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master->m_metadata.devid = luna_dev_makedev(DeviceRegistry::Terminal, 0);
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master->m_settings.c_lflag = ECHO | ECHOE | ECHOCTL | ISIG | ICANON;
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master->m_settings.c_cc[VEOF] = '\4';
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master->m_settings.c_cc[VERASE] = '\b';
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master->m_settings.c_cc[VINTR] = '\3';
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master->m_settings.c_cc[VQUIT] = '\x1c';
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master->m_window.ws_col = 80;
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master->m_window.ws_row = 25;
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slave->m_master = master.ptr();
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slave->m_metadata.devid = luna_dev_makedev(DeviceRegistry::Terminal, index + 1);
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slave->m_metadata.uid = Scheduler::current()->auth.euid;
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slave->m_metadata.gid = Scheduler::current()->auth.egid;
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slave->m_metadata.mode = 0620;
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return (SharedPtr<VFS::Inode>)master;
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}
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Result<void> MasterPTY::handle_background_process_group(bool can_succeed, int signo) const
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{
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if (!m_foreground_process_group.has_value()) return {};
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auto foreground_pgrp = m_foreground_process_group.value();
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auto* current = Scheduler::current();
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if (current->pgid == foreground_pgrp) return {};
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if ((current->signal_mask.get(signo - 1)) || (current->signal_handlers[signo - 1].sa_handler == SIG_IGN))
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{
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if (can_succeed) return {};
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return err(EIO);
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}
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current->send_signal(signo);
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if (can_succeed) return err(EINTR);
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return err(EIO);
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}
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Result<usize> MasterPTY::read(u8* buf, usize, usize length) const
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{
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length = m_buffer.dequeue_data(buf, length);
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return length;
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}
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Result<usize> MasterPTY::write(const u8* buf, usize, usize length)
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{
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TRY(m_slave->m_buffer.append_data(buf, length));
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return length;
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}
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Result<u64> MasterPTY::ioctl(int request, void* arg)
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{
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auto* current = Scheduler::current();
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TRY(check_pledge(current, Promise::p_tty));
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switch (request)
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{
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case TCGETS: {
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return MemoryManager::copy_to_user_typed((struct termios*)arg, &m_settings) ? 0 : err(EFAULT);
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}
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case TCSETS: {
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if (!MemoryManager::copy_from_user_typed((const struct termios*)arg, &m_settings)) return err(EFAULT);
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return 0;
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}
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case TIOCSPGRP: {
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pid_t pgid;
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if (!MemoryManager::copy_from_user_typed((const pid_t*)arg, &pgid)) return err(EFAULT);
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bool pgid_exists = false;
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Scheduler::for_each_in_process_group(pgid, [&pgid_exists](Thread*) {
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pgid_exists = true;
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return false;
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});
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if (!pgid_exists) return err(EPERM);
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m_foreground_process_group = pgid;
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return 0;
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}
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case TIOCGPGRP: {
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pid_t pgid = m_foreground_process_group.value_or((pid_t)next_thread_id());
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if (!MemoryManager::copy_to_user_typed((pid_t*)arg, &pgid)) return err(EFAULT);
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return 0;
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}
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case TIOCGWINSZ: {
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if (!MemoryManager::copy_to_user_typed((struct winsize*)arg, &m_window)) return err(EFAULT);
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return 0;
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}
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case TIOCGPTN: {
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if (!MemoryManager::copy_to_user_typed((int*)arg, &m_index)) return err(EFAULT);
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return 0;
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}
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default: return err(EINVAL);
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}
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}
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MasterPTY::~MasterPTY()
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{
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m_slave->m_master = nullptr;
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for (auto& fs : g_devpts_instances) { fs->root_inode()->remove_entry(m_slave->m_name.chars()); }
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PTYMultiplexer::did_remove_pty(m_index);
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}
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