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Kernel: Keep TTY names in character buffers instead of Strings

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Just going over some little unnecessary little kmalloc allocations.
This commit is contained in:
Andreas Kling 2019-10-18 14:13:43 +02:00
parent 2305dee455
commit 2f37fa487d
Notes: sideshowbarker 2024-07-19 11:39:14 +09:00
7 changed files with 27 additions and 31 deletions
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3
Kernel/Process.cpp
View file

@ -966,7 +966,8 @@ int Process::sys$ttyname_r(int fd, char* buffer, ssize_t size)
auto tty_name = description->tty()->tty_name();
if (size < tty_name.length() + 1)
return -ERANGE;
strcpy(buffer, tty_name.characters());
memcpy(buffer, tty_name.characters_without_null_termination(), tty_name.length());
buffer[tty_name.length()] = '\0';
return 0;
}

4
Kernel/TTY/SlavePTY.cpp
View file

@ -10,7 +10,7 @@ SlavePTY::SlavePTY(MasterPTY& master, unsigned index)
, m_master(master)
, m_index(index)
{
m_tty_name = String::format("/dev/pts/%u", m_index);
ksprintf(m_tty_name, "/dev/pts/%u", m_index);
set_uid(current->process().uid());
set_gid(current->process().gid());
DevPtsFS::register_slave_pty(*this);
@ -25,7 +25,7 @@ SlavePTY::~SlavePTY()
DevPtsFS::unregister_slave_pty(*this);
}
String SlavePTY::tty_name() const
StringView SlavePTY::tty_name() const
{
return m_tty_name;
}

4
Kernel/TTY/SlavePTY.h
View file

@ -14,7 +14,7 @@ public:
private:
// ^TTY
virtual String tty_name() const override;
virtual StringView tty_name() const override;
virtual ssize_t on_tty_write(const u8*, ssize_t) override;
// ^CharacterDevice
@ -29,5 +29,5 @@ private:
RefPtr<MasterPTY> m_master;
unsigned m_index;
String m_tty_name;
char m_tty_name[32];
};

37
Kernel/TTY/TTY.cpp
View file

@ -62,17 +62,17 @@ void TTY::emit(u8 ch)
{
if (should_generate_signals()) {
if (ch == m_termios.c_cc[VINTR]) {
dbgprintf("%s: VINTR pressed!\n", tty_name().characters());
dbg() << tty_name() << ": VINTR pressed!";
generate_signal(SIGINT);
return;
}
if (ch == m_termios.c_cc[VQUIT]) {
dbgprintf("%s: VQUIT pressed!\n", tty_name().characters());
dbg() << tty_name() << ": VQUIT pressed!";
generate_signal(SIGQUIT);
return;
}
if (ch == m_termios.c_cc[VSUSP]) {
dbgprintf("%s: VSUSP pressed!\n", tty_name().characters());
dbg() << tty_name() << ": VSUSP pressed!";
generate_signal(SIGTSTP);
return;
}
@ -84,10 +84,10 @@ void TTY::generate_signal(int signal)
{
if (!pgid())
return;
dbgprintf("%s: Send signal %d to everyone in pgrp %d\n", tty_name().characters(), signal, pgid());
dbg() << tty_name() << ": Send signal " << signal << " to everyone in pgrp " << 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", tty_name().characters(), signal, process.pid());
dbg() << tty_name() << ": Send signal " << signal << " to " << process;
process.send_signal(signal, nullptr);
return IterationDecision::Continue;
});
@ -96,22 +96,17 @@ void TTY::generate_signal(int signal)
void TTY::set_termios(const termios& t)
{
m_termios = t;
dbgprintf("%s set_termios: ECHO=%u, ISIG=%u, ICANON=%u\n",
tty_name().characters(),
should_echo_input(),
should_generate_signals(),
in_canonical_mode());
dbgprintf("%s set_termios: ECHOE=%u, ECHOK=%u, ECHONL=%u\n",
tty_name().characters(),
(m_termios.c_lflag & ECHOE) != 0,
(m_termios.c_lflag & ECHOK) != 0,
(m_termios.c_lflag & ECHONL) != 0);
dbgprintf("%s set_termios: ISTRIP=%u, ICRNL=%u, INLCR=%u, IGNCR=%u\n",
tty_name().characters(),
(m_termios.c_iflag & ISTRIP) != 0,
(m_termios.c_iflag & ICRNL) != 0,
(m_termios.c_iflag & INLCR) != 0,
(m_termios.c_iflag & IGNCR) != 0);
dbg() << tty_name() << " set_termios: "
<< "ECHO=" << should_echo_input()
<< ", ISIG=" << should_generate_signals()
<< ", ICANON=" << in_canonical_mode()
<< ", ECHOE=" << ((m_termios.c_lflag & ECHOE) != 0)
<< ", ECHOK=" << ((m_termios.c_lflag & ECHOK) != 0)
<< ", ECHONL=" << ((m_termios.c_lflag & ECHONL) != 0)
<< ", ISTRIP=" << ((m_termios.c_iflag & ISTRIP) != 0)
<< ", ICRNL=" << ((m_termios.c_iflag & ICRNL) != 0)
<< ", INLCR=" << ((m_termios.c_iflag & INLCR) != 0)
<< ", IGNCR=" << ((m_termios.c_iflag & IGNCR) != 0);
}
int TTY::ioctl(FileDescription&, unsigned request, unsigned arg)

2
Kernel/TTY/TTY.h
View file

@ -18,7 +18,7 @@ public:
virtual int ioctl(FileDescription&, unsigned request, unsigned arg) override final;
virtual String absolute_path(const FileDescription&) const override { return tty_name(); }
virtual String tty_name() const = 0;
virtual StringView tty_name() const = 0;
unsigned short rows() const { return m_rows; }
unsigned short columns() const { return m_columns; }

4
Kernel/TTY/VirtualConsole.cpp
View file

@ -41,7 +41,7 @@ VirtualConsole::VirtualConsole(unsigned index, InitialContents initial_contents)
: TTY(4, index)
, m_index(index)
{
m_tty_name = String::format("/dev/tty%u", m_index);
ksprintf(m_tty_name, "/dev/tty%u", m_index);
set_size(80, 25);
m_horizontal_tabs = static_cast<u8*>(kmalloc(columns()));
for (unsigned i = 0; i < columns(); ++i)
@ -541,7 +541,7 @@ ssize_t VirtualConsole::on_tty_write(const u8* data, ssize_t size)
return size;
}
String VirtualConsole::tty_name() const
StringView VirtualConsole::tty_name() const
{
return m_tty_name;
}

4
Kernel/TTY/VirtualConsole.h
View file

@ -32,7 +32,7 @@ private:
// ^TTY
virtual ssize_t on_tty_write(const u8*, ssize_t) override;
virtual String tty_name() const override;
virtual StringView tty_name() const override;
// ^CharacterDevice
virtual const char* class_name() const override { return "VirtualConsole"; }
@ -87,5 +87,5 @@ private:
Vector<u8> m_parameters;
Vector<u8> m_intermediates;
u8* m_horizontal_tabs { nullptr };
String m_tty_name;
char m_tty_name[32];
};