2020-01-18 08:38:21 +00:00
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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2021-04-22 08:24:48 +00:00
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* SPDX-License-Identifier: BSD-2-Clause
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2020-01-18 08:38:21 +00:00
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*/
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2020-11-29 23:05:27 +00:00
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#include <AK/ScopeGuard.h>
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2021-01-25 15:07:10 +00:00
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#include <Kernel/Debug.h>
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2020-05-06 15:40:06 +00:00
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#include <Kernel/Process.h>
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2019-06-07 09:43:58 +00:00
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#include <Kernel/TTY/TTY.h>
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2018-11-16 12:11:21 +00:00
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#include <LibC/errno_numbers.h>
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2018-11-06 14:45:16 +00:00
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#include <LibC/signal_numbers.h>
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2018-11-16 12:11:21 +00:00
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#include <LibC/sys/ioctl_numbers.h>
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2018-10-30 12:59:29 +00:00
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2020-02-16 00:27:42 +00:00
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namespace Kernel {
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2018-10-30 12:59:29 +00:00
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TTY::TTY(unsigned major, unsigned minor)
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: CharacterDevice(major, minor)
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{
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2018-12-07 00:19:02 +00:00
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set_default_termios();
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2018-10-30 12:59:29 +00:00
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}
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TTY::~TTY()
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{
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}
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2018-12-07 00:19:02 +00:00
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void TTY::set_default_termios()
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{
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memset(&m_termios, 0, sizeof(m_termios));
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2019-10-20 06:12:00 +00:00
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m_termios.c_lflag |= ISIG | ECHO | ICANON;
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2020-09-08 16:07:25 +00:00
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static const char default_cc[32] = "\003\034\010\025\004\0\1\0\021\023\032\0\022\017\027\026\0\024";
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2018-12-07 00:19:02 +00:00
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memcpy(m_termios.c_cc, default_cc, sizeof(default_cc));
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}
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2021-03-17 12:18:51 +00:00
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KResultOr<size_t> TTY::read(FileDescription&, u64, UserOrKernelBuffer& buffer, size_t size)
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2018-10-30 12:59:29 +00:00
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{
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2020-08-04 19:25:44 +00:00
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if (Process::current()->pgid() != pgid()) {
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2020-10-02 21:14:37 +00:00
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// FIXME: Should we propagate this error path somehow?
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2020-12-20 23:09:48 +00:00
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[[maybe_unused]] auto rc = Process::current()->send_signal(SIGTTIN, nullptr);
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2021-01-20 22:11:17 +00:00
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return EINTR;
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2020-08-04 19:25:44 +00:00
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}
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2020-02-20 12:18:42 +00:00
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if (m_input_buffer.size() < static_cast<size_t>(size))
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2019-08-12 11:32:28 +00:00
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size = m_input_buffer.size();
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2020-09-12 03:11:07 +00:00
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ssize_t nwritten;
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2020-11-29 23:05:27 +00:00
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bool need_evaluate_block_conditions = false;
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2019-10-20 06:12:00 +00:00
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if (in_canonical_mode()) {
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2020-09-12 03:11:07 +00:00
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nwritten = buffer.write_buffered<512>(size, [&](u8* data, size_t data_size) {
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size_t i = 0;
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for (; i < data_size; i++) {
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u8 ch = m_input_buffer.dequeue();
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if (ch == '\0') {
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//Here we handle a ^D line, so we don't add the
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//character to the output.
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m_available_lines--;
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2020-11-29 23:05:27 +00:00
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need_evaluate_block_conditions = true;
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2020-09-12 03:11:07 +00:00
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break;
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} else if (ch == '\n' || is_eol(ch)) {
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data[i] = ch;
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i++;
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m_available_lines--;
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break;
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}
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data[i] = ch;
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2019-10-20 06:12:00 +00:00
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}
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2020-09-12 03:11:07 +00:00
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return (ssize_t)i;
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});
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} else {
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nwritten = buffer.write_buffered<512>(size, [&](u8* data, size_t data_size) {
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2021-04-30 02:45:27 +00:00
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for (size_t i = 0; i < data_size; i++) {
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auto ch = m_input_buffer.dequeue();
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if (ch == '\r' && m_termios.c_iflag & ICRNL)
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ch = '\n';
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else if (ch == '\n' && m_termios.c_iflag & INLCR)
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ch = '\r';
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data[i] = ch;
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}
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2020-09-12 03:11:07 +00:00
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return (ssize_t)data_size;
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});
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2019-10-20 06:12:00 +00:00
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}
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2020-09-12 03:11:07 +00:00
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if (nwritten < 0)
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2021-01-20 22:11:17 +00:00
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return KResult((ErrnoCode)-nwritten);
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2020-11-29 23:05:27 +00:00
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if (nwritten > 0 || need_evaluate_block_conditions)
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evaluate_block_conditions();
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2020-09-12 03:11:07 +00:00
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return (size_t)nwritten;
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2018-10-30 12:59:29 +00:00
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}
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2021-03-17 12:18:51 +00:00
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KResultOr<size_t> TTY::write(FileDescription&, u64, const UserOrKernelBuffer& buffer, size_t size)
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2018-10-30 12:59:29 +00:00
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{
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2021-01-11 21:40:40 +00:00
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if (m_termios.c_lflag & TOSTOP && Process::current()->pgid() != pgid()) {
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2020-12-20 23:09:48 +00:00
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[[maybe_unused]] auto rc = Process::current()->send_signal(SIGTTOU, nullptr);
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2021-01-20 22:11:17 +00:00
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return EINTR;
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2020-08-04 19:25:44 +00:00
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}
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2021-04-30 02:45:27 +00:00
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const size_t num_chars = 256;
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ssize_t nread = buffer.read_buffered<num_chars>((size_t)size, [&](const u8* data, size_t buffer_bytes) {
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u8 modified_data[num_chars * 2];
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size_t extra_chars = 0;
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for (size_t i = 0; i < buffer_bytes; ++i) {
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auto ch = data[i];
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if (ch == '\n' && (m_termios.c_oflag & (OPOST | ONLCR))) {
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modified_data[i + extra_chars] = '\r';
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extra_chars++;
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}
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modified_data[i + extra_chars] = ch;
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}
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on_tty_write(UserOrKernelBuffer::for_kernel_buffer(modified_data), buffer_bytes + extra_chars);
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return (ssize_t)buffer_bytes;
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});
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return nread;
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2018-10-30 12:59:29 +00:00
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}
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2020-04-10 09:44:42 +00:00
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bool TTY::can_read(const FileDescription&, size_t) const
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2018-10-30 12:59:29 +00:00
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{
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2019-10-20 06:12:00 +00:00
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if (in_canonical_mode()) {
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return m_available_lines > 0;
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}
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2019-08-12 11:32:28 +00:00
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return !m_input_buffer.is_empty();
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2018-10-30 14:33:37 +00:00
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}
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2020-04-10 09:44:42 +00:00
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bool TTY::can_write(const FileDescription&, size_t) const
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2019-01-15 08:17:22 +00:00
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{
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return true;
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}
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2019-10-20 06:12:00 +00:00
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bool TTY::is_eol(u8 ch) const
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{
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return ch == m_termios.c_cc[VEOL];
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}
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bool TTY::is_eof(u8 ch) const
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{
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return ch == m_termios.c_cc[VEOF];
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}
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bool TTY::is_kill(u8 ch) const
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{
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return ch == m_termios.c_cc[VKILL];
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}
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bool TTY::is_erase(u8 ch) const
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{
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return ch == m_termios.c_cc[VERASE];
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}
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bool TTY::is_werase(u8 ch) const
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{
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return ch == m_termios.c_cc[VWERASE];
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}
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2020-11-29 23:05:27 +00:00
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void TTY::emit(u8 ch, bool do_evaluate_block_conditions)
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2018-10-30 14:33:37 +00:00
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{
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2018-11-16 19:18:58 +00:00
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if (should_generate_signals()) {
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2020-09-08 16:07:25 +00:00
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if (ch == m_termios.c_cc[VINFO]) {
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2021-01-10 15:21:56 +00:00
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dbgln("{}: VINFO pressed!", tty_name());
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2020-09-08 16:07:25 +00:00
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generate_signal(SIGINFO);
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return;
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}
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2018-11-16 19:18:58 +00:00
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if (ch == m_termios.c_cc[VINTR]) {
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2021-01-10 15:21:56 +00:00
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dbgln("{}: VINTR pressed!", tty_name());
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2018-11-16 19:18:58 +00:00
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generate_signal(SIGINT);
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return;
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}
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if (ch == m_termios.c_cc[VQUIT]) {
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2021-01-10 15:21:56 +00:00
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dbgln("{}: VQUIT pressed!", tty_name());
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2018-11-16 19:18:58 +00:00
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generate_signal(SIGQUIT);
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return;
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}
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2019-06-06 18:31:14 +00:00
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if (ch == m_termios.c_cc[VSUSP]) {
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2021-01-10 15:21:56 +00:00
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dbgln("{}: VSUSP pressed!", tty_name());
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2019-06-06 18:31:14 +00:00
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generate_signal(SIGTSTP);
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2020-12-30 21:44:54 +00:00
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if (auto original_process_parent = m_original_process_parent.strong_ref()) {
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2020-12-20 23:09:48 +00:00
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[[maybe_unused]] auto rc = original_process_parent->send_signal(SIGCHLD, nullptr);
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2020-12-30 21:44:54 +00:00
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}
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2020-08-08 20:04:20 +00:00
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// TODO: Else send it to the session leader maybe?
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2019-06-06 18:31:14 +00:00
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return;
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}
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2018-11-16 19:18:58 +00:00
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}
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2019-10-20 06:12:00 +00:00
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2020-11-29 23:05:27 +00:00
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ScopeGuard guard([&]() {
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if (do_evaluate_block_conditions)
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evaluate_block_conditions();
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});
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2019-10-20 06:12:00 +00:00
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if (in_canonical_mode()) {
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if (is_eof(ch)) {
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m_available_lines++;
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//We use '\0' to delimit the end
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//of a line.
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m_input_buffer.enqueue('\0');
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return;
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}
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if (is_kill(ch)) {
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kill_line();
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return;
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}
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if (is_erase(ch)) {
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do_backspace();
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return;
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}
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if (is_werase(ch)) {
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erase_word();
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return;
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}
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if (ch == '\n' || is_eol(ch)) {
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m_available_lines++;
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}
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}
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2019-08-12 11:32:28 +00:00
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m_input_buffer.enqueue(ch);
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2019-10-20 06:12:00 +00:00
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echo(ch);
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}
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bool TTY::can_do_backspace() const
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{
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2020-10-02 21:14:37 +00:00
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// can't do back space if we're empty. Plus, we don't want to
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// remove any lines "committed" by newlines or ^D.
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2019-10-20 06:12:00 +00:00
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if (!m_input_buffer.is_empty() && !is_eol(m_input_buffer.last()) && m_input_buffer.last() != '\0') {
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return true;
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}
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return false;
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}
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void TTY::do_backspace()
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{
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if (can_do_backspace()) {
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m_input_buffer.dequeue_end();
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2020-01-25 19:43:37 +00:00
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echo(8);
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echo(' ');
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echo(8);
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2020-11-29 23:05:27 +00:00
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evaluate_block_conditions();
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2019-10-20 06:12:00 +00:00
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}
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}
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// TODO: Currently, both erase_word() and kill_line work by sending
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// a lot of VERASE characters; this is done because Terminal.cpp
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// doesn't currently support VWERASE and VKILL. When these are
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// implemented we could just send a VKILL or VWERASE.
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void TTY::erase_word()
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{
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//Note: if we have leading whitespace before the word
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//we want to delete we have to also delete that.
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bool first_char = false;
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2020-11-29 23:05:27 +00:00
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bool did_dequeue = false;
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2019-10-20 06:12:00 +00:00
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while (can_do_backspace()) {
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u8 ch = m_input_buffer.last();
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if (ch == ' ' && first_char)
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break;
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if (ch != ' ')
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first_char = true;
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m_input_buffer.dequeue_end();
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2020-11-29 23:05:27 +00:00
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did_dequeue = true;
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2020-03-26 07:15:29 +00:00
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erase_character();
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2019-10-20 06:12:00 +00:00
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}
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2020-11-29 23:05:27 +00:00
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if (did_dequeue)
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evaluate_block_conditions();
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2019-10-20 06:12:00 +00:00
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}
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void TTY::kill_line()
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{
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2020-11-29 23:05:27 +00:00
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bool did_dequeue = false;
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2019-10-20 06:12:00 +00:00
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while (can_do_backspace()) {
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m_input_buffer.dequeue_end();
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2020-11-29 23:05:27 +00:00
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did_dequeue = true;
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2020-03-26 07:15:29 +00:00
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erase_character();
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2019-10-20 06:12:00 +00:00
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}
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2020-11-29 23:05:27 +00:00
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if (did_dequeue)
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evaluate_block_conditions();
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2018-10-30 12:59:29 +00:00
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}
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2018-11-02 13:06:48 +00:00
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2020-03-26 07:15:29 +00:00
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void TTY::erase_character()
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{
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echo(m_termios.c_cc[VERASE]);
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echo(' ');
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echo(m_termios.c_cc[VERASE]);
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}
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2018-11-16 19:18:58 +00:00
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void TTY::generate_signal(int signal)
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2018-11-02 13:06:48 +00:00
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{
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2018-11-16 19:18:58 +00:00
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if (!pgid())
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2018-11-11 14:36:40 +00:00
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return;
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2019-11-02 09:07:14 +00:00
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if (should_flush_on_signal())
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flush_input();
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2021-02-21 09:52:02 +00:00
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dbgln_if(TTY_DEBUG, "{}: Send signal {} to everyone in pgrp {}", tty_name(), signal, pgid().value());
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2018-11-16 19:18:58 +00:00
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InterruptDisabler disabler; // FIXME: Iterate over a set of process handles instead?
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2019-06-07 09:43:58 +00:00
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Process::for_each_in_pgrp(pgid(), [&](auto& process) {
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2021-02-21 09:52:02 +00:00
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dbgln_if(TTY_DEBUG, "{}: Send signal {} to {}", tty_name(), signal, process);
|
2020-08-05 09:13:30 +00:00
|
|
|
// FIXME: Should this error be propagated somehow?
|
2020-12-20 23:09:48 +00:00
|
|
|
[[maybe_unused]] auto rc = process.send_signal(signal, nullptr);
|
2019-08-22 19:12:55 +00:00
|
|
|
return IterationDecision::Continue;
|
2018-11-16 19:18:58 +00:00
|
|
|
});
|
2018-11-02 13:06:48 +00:00
|
|
|
}
|
2018-11-12 11:27:28 +00:00
|
|
|
|
2019-11-01 14:24:14 +00:00
|
|
|
void TTY::flush_input()
|
|
|
|
{
|
|
|
|
m_available_lines = 0;
|
|
|
|
m_input_buffer.clear();
|
2020-11-29 23:05:27 +00:00
|
|
|
evaluate_block_conditions();
|
2019-11-01 14:24:14 +00:00
|
|
|
}
|
|
|
|
|
2019-01-23 05:53:01 +00:00
|
|
|
void TTY::set_termios(const termios& t)
|
2018-11-12 11:27:28 +00:00
|
|
|
{
|
|
|
|
m_termios = t;
|
2021-01-15 20:29:01 +00:00
|
|
|
|
2021-04-30 02:45:27 +00:00
|
|
|
dbgln_if(TTY_DEBUG, "{} set_termios: ECHO={}, ISIG={}, ICANON={}, ECHOE={}, ECHOK={}, ECHONL={}, ISTRIP={}, ICRNL={}, INLCR={}, IGNCR={}, OPOST={}, ONLCR={}",
|
2021-01-15 20:29:01 +00:00
|
|
|
tty_name(),
|
|
|
|
should_echo_input(),
|
|
|
|
should_generate_signals(),
|
|
|
|
in_canonical_mode(),
|
|
|
|
((m_termios.c_lflag & ECHOE) != 0),
|
|
|
|
((m_termios.c_lflag & ECHOK) != 0),
|
|
|
|
((m_termios.c_lflag & ECHONL) != 0),
|
|
|
|
((m_termios.c_iflag & ISTRIP) != 0),
|
|
|
|
((m_termios.c_iflag & ICRNL) != 0),
|
|
|
|
((m_termios.c_iflag & INLCR) != 0),
|
2021-04-30 02:45:27 +00:00
|
|
|
((m_termios.c_iflag & IGNCR) != 0),
|
|
|
|
((m_termios.c_oflag & OPOST) != 0),
|
|
|
|
((m_termios.c_oflag & ONLCR) != 0));
|
2018-11-12 11:27:28 +00:00
|
|
|
}
|
2018-11-16 12:11:21 +00:00
|
|
|
|
2020-05-23 11:17:58 +00:00
|
|
|
int TTY::ioctl(FileDescription&, unsigned request, FlatPtr arg)
|
2018-11-16 12:11:21 +00:00
|
|
|
{
|
2020-01-12 12:28:45 +00:00
|
|
|
REQUIRE_PROMISE(tty);
|
2020-06-28 21:34:31 +00:00
|
|
|
auto& current_process = *Process::current();
|
2020-07-30 22:17:25 +00:00
|
|
|
termios* user_termios;
|
|
|
|
winsize* user_winsize;
|
2018-11-16 14:41:48 +00:00
|
|
|
|
2019-02-20 22:32:33 +00:00
|
|
|
#if 0
|
|
|
|
// FIXME: When should we block things?
|
|
|
|
// How do we make this work together with MasterPTY forwarding to us?
|
2020-06-28 21:34:31 +00:00
|
|
|
if (current_process.tty() && current_process.tty() != this) {
|
2018-11-16 12:11:21 +00:00
|
|
|
return -ENOTTY;
|
2019-02-20 22:32:33 +00:00
|
|
|
}
|
|
|
|
#endif
|
2018-11-16 12:11:21 +00:00
|
|
|
switch (request) {
|
|
|
|
case TIOCGPGRP:
|
2020-08-08 20:04:20 +00:00
|
|
|
return this->pgid().value();
|
|
|
|
case TIOCSPGRP: {
|
|
|
|
ProcessGroupID pgid = static_cast<pid_t>(arg);
|
2020-02-26 20:33:14 +00:00
|
|
|
if (pgid <= 0)
|
2018-11-16 12:11:21 +00:00
|
|
|
return -EINVAL;
|
2020-08-08 20:04:20 +00:00
|
|
|
InterruptDisabler disabler;
|
2020-08-15 19:13:19 +00:00
|
|
|
auto process_group = ProcessGroup::from_pgid(pgid);
|
|
|
|
// Disallow setting a nonexistent PGID.
|
|
|
|
if (!process_group)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
auto process = Process::from_pid(ProcessID(pgid.value()));
|
2020-08-08 20:04:20 +00:00
|
|
|
SessionID new_sid = process ? process->sid() : Process::get_sid_from_pgid(pgid);
|
|
|
|
if (!new_sid || new_sid != current_process.sid())
|
|
|
|
return -EPERM;
|
|
|
|
if (process && pgid != process->pgid())
|
|
|
|
return -EPERM;
|
2020-11-29 23:05:27 +00:00
|
|
|
m_pg = process_group;
|
2020-08-15 19:13:19 +00:00
|
|
|
|
|
|
|
if (process) {
|
|
|
|
if (auto parent = Process::from_pid(process->ppid())) {
|
AK: Make RefPtr, NonnullRefPtr, WeakPtr thread safe
This makes most operations thread safe, especially so that they
can safely be used in the Kernel. This includes obtaining a strong
reference from a weak reference, which now requires an explicit
call to WeakPtr::strong_ref(). Another major change is that
Weakable::make_weak_ref() may require the explicit target type.
Previously we used reinterpret_cast in WeakPtr, assuming that it
can be properly converted. But WeakPtr does not necessarily have
the knowledge to be able to do this. Instead, we now ask the class
itself to deliver a WeakPtr to the type that we want.
Also, WeakLink is no longer specific to a target type. The reason
for this is that we want to be able to safely convert e.g. WeakPtr<T>
to WeakPtr<U>, and before this we just reinterpret_cast the internal
WeakLink<T> to WeakLink<U>, which is a bold assumption that it would
actually produce the correct code. Instead, WeakLink now operates
on just a raw pointer and we only make those constructors/operators
available if we can verify that it can be safely cast.
In order to guarantee thread safety, we now use the least significant
bit in the pointer for locking purposes. This also means that only
properly aligned pointers can be used.
2020-09-29 22:26:13 +00:00
|
|
|
m_original_process_parent = *parent;
|
2020-08-15 19:13:19 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
m_original_process_parent = nullptr;
|
2018-11-16 14:41:48 +00:00
|
|
|
return 0;
|
2020-08-08 20:04:20 +00:00
|
|
|
}
|
2020-07-30 22:17:25 +00:00
|
|
|
case TCGETS: {
|
|
|
|
user_termios = reinterpret_cast<termios*>(arg);
|
2020-09-12 03:11:07 +00:00
|
|
|
if (!copy_to_user(user_termios, &m_termios))
|
2018-11-16 14:41:48 +00:00
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
2020-07-30 22:17:25 +00:00
|
|
|
}
|
2018-11-16 14:41:48 +00:00
|
|
|
case TCSETS:
|
2018-11-16 16:56:18 +00:00
|
|
|
case TCSETSF:
|
2020-07-30 22:17:25 +00:00
|
|
|
case TCSETSW: {
|
|
|
|
user_termios = reinterpret_cast<termios*>(arg);
|
|
|
|
termios termios;
|
2020-09-12 03:11:07 +00:00
|
|
|
if (!copy_from_user(&termios, user_termios))
|
|
|
|
return -EFAULT;
|
2020-07-30 22:17:25 +00:00
|
|
|
set_termios(termios);
|
2020-05-09 10:30:51 +00:00
|
|
|
if (request == TCSETSF)
|
|
|
|
flush_input();
|
2018-11-16 12:11:21 +00:00
|
|
|
return 0;
|
2020-07-30 22:17:25 +00:00
|
|
|
}
|
2020-07-11 04:19:08 +00:00
|
|
|
case TCFLSH:
|
|
|
|
// Serenity's TTY implementation does not use an output buffer, so ignore TCOFLUSH.
|
|
|
|
if (arg == TCIFLUSH || arg == TCIOFLUSH) {
|
|
|
|
flush_input();
|
|
|
|
} else if (arg != TCOFLUSH) {
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return 0;
|
2018-11-29 02:45:23 +00:00
|
|
|
case TIOCGWINSZ:
|
2020-07-30 22:17:25 +00:00
|
|
|
user_winsize = reinterpret_cast<winsize*>(arg);
|
|
|
|
winsize ws;
|
|
|
|
ws.ws_row = m_rows;
|
|
|
|
ws.ws_col = m_columns;
|
|
|
|
ws.ws_xpixel = 0;
|
|
|
|
ws.ws_ypixel = 0;
|
2020-09-12 03:11:07 +00:00
|
|
|
if (!copy_to_user(user_winsize, &ws))
|
|
|
|
return -EFAULT;
|
2018-11-29 02:45:23 +00:00
|
|
|
return 0;
|
2020-07-30 22:17:25 +00:00
|
|
|
case TIOCSWINSZ: {
|
|
|
|
user_winsize = reinterpret_cast<winsize*>(arg);
|
|
|
|
winsize ws;
|
2020-09-12 03:11:07 +00:00
|
|
|
if (!copy_from_user(&ws, user_winsize))
|
|
|
|
return -EFAULT;
|
2020-07-30 22:17:25 +00:00
|
|
|
if (ws.ws_col == m_columns && ws.ws_row == m_rows)
|
2019-02-20 22:32:33 +00:00
|
|
|
return 0;
|
2020-07-30 22:17:25 +00:00
|
|
|
m_rows = ws.ws_row;
|
|
|
|
m_columns = ws.ws_col;
|
2019-02-20 22:32:33 +00:00
|
|
|
generate_signal(SIGWINCH);
|
|
|
|
return 0;
|
2020-07-30 22:17:25 +00:00
|
|
|
}
|
2019-01-15 07:49:24 +00:00
|
|
|
case TIOCSCTTY:
|
2020-06-28 21:34:31 +00:00
|
|
|
current_process.set_tty(this);
|
2019-01-15 07:49:24 +00:00
|
|
|
return 0;
|
2021-03-31 20:58:41 +00:00
|
|
|
case TIOCSTI:
|
|
|
|
return -EIO;
|
2019-01-15 07:49:24 +00:00
|
|
|
case TIOCNOTTY:
|
2020-06-28 21:34:31 +00:00
|
|
|
current_process.set_tty(nullptr);
|
2019-01-15 07:49:24 +00:00
|
|
|
return 0;
|
2018-11-16 12:11:21 +00:00
|
|
|
}
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
2018-11-29 02:45:23 +00:00
|
|
|
|
|
|
|
void TTY::set_size(unsigned short columns, unsigned short rows)
|
|
|
|
{
|
|
|
|
m_rows = rows;
|
|
|
|
m_columns = columns;
|
|
|
|
}
|
2019-02-05 11:55:19 +00:00
|
|
|
|
|
|
|
void TTY::hang_up()
|
|
|
|
{
|
|
|
|
generate_signal(SIGHUP);
|
|
|
|
}
|
2020-02-16 00:27:42 +00:00
|
|
|
}
|