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#include "TTY.h"
#include "Process.h"
#include <LibC/errno_numbers.h>
#include <LibC/signal_numbers.h>
#include <LibC/sys/ioctl_numbers.h>
//#define TTY_DEBUG
void DoubleBuffer::flip()
{
ASSERT(m_read_buffer_index == m_read_buffer->size());
swap(m_read_buffer, m_write_buffer);
m_write_buffer->clear();
m_read_buffer_index = 0;
}
Unix::ssize_t DoubleBuffer::write(const byte* data, size_t size)
{
m_write_buffer->append(data, size);
return size;
}
Unix::ssize_t DoubleBuffer::read(byte* data, size_t size)
{
if (m_read_buffer_index >= m_read_buffer->size() && !m_write_buffer->isEmpty())
flip();
if (m_read_buffer_index >= m_read_buffer->size())
return 0;
ssize_t nread = min(m_read_buffer->size() - m_read_buffer_index, size);
memcpy(data, m_read_buffer->data() + m_read_buffer_index, nread);
m_read_buffer_index += nread;
return nread;
}
TTY::TTY(unsigned major, unsigned minor)
: CharacterDevice(major, minor)
{
memset(&m_termios, 0, sizeof(m_termios));
m_termios.c_lflag |= ISIG | ECHO;
static const char default_cc[32] = "\003\034\177\025\004\0\1\0\021\023\032\0\022\017\027\026\0";
memcpy(m_termios.c_cc, default_cc, sizeof(default_cc));
}
TTY::~TTY()
{
}
ssize_t TTY::read(byte* buffer, size_t size)
{
return m_buffer.read(buffer, size);
}
ssize_t TTY::write(const byte* buffer, size_t size)
{
#ifdef TTY_DEBUG
dbgprintf("TTY::write %b {%u}\n", buffer[0], size);
#endif
onTTYWrite(buffer, size);
return 0;
}
bool TTY::hasDataAvailableForRead() const
{
return !m_buffer.is_empty();
}
void TTY::emit(byte ch)
{
if (should_generate_signals()) {
if (ch == m_termios.c_cc[VINTR]) {
dbgprintf("%s: VINTR pressed!\n", ttyName().characters());
generate_signal(SIGINT);
return;
}
if (ch == m_termios.c_cc[VQUIT]) {
dbgprintf("%s: VQUIT pressed!\n", ttyName().characters());
generate_signal(SIGQUIT);
return;
}
}
m_buffer.write(&ch, 1);
}
void TTY::generate_signal(int signal)
{
if (!pgid())
return;
dbgprintf("%s: Send signal %d to everyone in pgrp %d\n", ttyName().characters(), signal, pgid());
InterruptDisabler disabler; // FIXME: Iterate over a set of process handles instead?
Process::for_each_in_pgrp(pgid(), [&] (auto& process) {
dbgprintf("%s: Send signal %d to %d\n", ttyName().characters(), signal, process.pid());
process.send_signal(signal, nullptr);
return true;
});
}
void TTY::set_termios(const Unix::termios& t)
{
m_termios = t;
dbgprintf("%s set_termios: IECHO? %u, ISIG? %u, ICANON? %u\n",
ttyName().characters(),
should_echo_input(),
should_generate_signals(),
in_canonical_mode()
);
}
int TTY::ioctl(Process& process, unsigned request, unsigned arg)
{
pid_t pgid;
Unix::termios* tp;
if (process.tty() != this)
return -ENOTTY;
switch (request) {
case TIOCGPGRP:
return m_pgid;
case TIOCSPGRP:
// FIXME: Validate pgid fully.
pgid = static_cast<pid_t>(arg);
if (pgid < 0)
return -EINVAL;
m_pgid = pgid;
return 0;
case TCGETS:
tp = reinterpret_cast<Unix::termios*>(arg);
if (!process.validate_write(tp, sizeof(Unix::termios)))
return -EFAULT;
*tp = m_termios;
return 0;
case TCSETS:
case TCSETSF:
case TCSETSW:
tp = reinterpret_cast<Unix::termios*>(arg);
if (!process.validate_read(tp, sizeof(Unix::termios)))
return -EFAULT;
set_termios(*tp);
return 0;
}
ASSERT_NOT_REACHED();
return -EINVAL;
}
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