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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
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(); auto tty_name = description->tty()->tty_name();
if (size < tty_name.length() + 1) if (size < tty_name.length() + 1)
return -ERANGE; 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; return 0;
} }

4
Kernel/TTY/SlavePTY.cpp
View file

@ -10,7 +10,7 @@ SlavePTY::SlavePTY(MasterPTY& master, unsigned index)
, m_master(master) , m_master(master)
, m_index(index) , 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_uid(current->process().uid());
set_gid(current->process().gid()); set_gid(current->process().gid());
DevPtsFS::register_slave_pty(*this); DevPtsFS::register_slave_pty(*this);
@ -25,7 +25,7 @@ SlavePTY::~SlavePTY()
DevPtsFS::unregister_slave_pty(*this); DevPtsFS::unregister_slave_pty(*this);
} }
String SlavePTY::tty_name() const StringView SlavePTY::tty_name() const
{ {
return m_tty_name; return m_tty_name;
} }

4
Kernel/TTY/SlavePTY.h
View file

@ -14,7 +14,7 @@ public:
private: private:
// ^TTY // ^TTY
virtual String tty_name() const override; virtual StringView tty_name() const override;
virtual ssize_t on_tty_write(const u8*, ssize_t) override; virtual ssize_t on_tty_write(const u8*, ssize_t) override;
// ^CharacterDevice // ^CharacterDevice
@ -29,5 +29,5 @@ private:
RefPtr<MasterPTY> m_master; RefPtr<MasterPTY> m_master;
unsigned m_index; 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 (should_generate_signals()) {
if (ch == m_termios.c_cc[VINTR]) { if (ch == m_termios.c_cc[VINTR]) {
dbgprintf("%s: VINTR pressed!\n", tty_name().characters()); dbg() << tty_name() << ": VINTR pressed!";
generate_signal(SIGINT); generate_signal(SIGINT);
return; return;
} }
if (ch == m_termios.c_cc[VQUIT]) { if (ch == m_termios.c_cc[VQUIT]) {
dbgprintf("%s: VQUIT pressed!\n", tty_name().characters()); dbg() << tty_name() << ": VQUIT pressed!";
generate_signal(SIGQUIT); generate_signal(SIGQUIT);
return; return;
} }
if (ch == m_termios.c_cc[VSUSP]) { if (ch == m_termios.c_cc[VSUSP]) {
dbgprintf("%s: VSUSP pressed!\n", tty_name().characters()); dbg() << tty_name() << ": VSUSP pressed!";
generate_signal(SIGTSTP); generate_signal(SIGTSTP);
return; return;
} }
@ -84,10 +84,10 @@ void TTY::generate_signal(int signal)
{ {
if (!pgid()) if (!pgid())
return; 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? InterruptDisabler disabler; // FIXME: Iterate over a set of process handles instead?
Process::for_each_in_pgrp(pgid(), [&](auto& process) { 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); process.send_signal(signal, nullptr);
return IterationDecision::Continue; return IterationDecision::Continue;
}); });
@ -96,22 +96,17 @@ void TTY::generate_signal(int signal)
void TTY::set_termios(const termios& t) void TTY::set_termios(const termios& t)
{ {
m_termios = t; m_termios = t;
dbgprintf("%s set_termios: ECHO=%u, ISIG=%u, ICANON=%u\n", dbg() << tty_name() << " set_termios: "
tty_name().characters(), << "ECHO=" << should_echo_input()
should_echo_input(), << ", ISIG=" << should_generate_signals()
should_generate_signals(), << ", ICANON=" << in_canonical_mode()
in_canonical_mode()); << ", ECHOE=" << ((m_termios.c_lflag & ECHOE) != 0)
dbgprintf("%s set_termios: ECHOE=%u, ECHOK=%u, ECHONL=%u\n", << ", ECHOK=" << ((m_termios.c_lflag & ECHOK) != 0)
tty_name().characters(), << ", ECHONL=" << ((m_termios.c_lflag & ECHONL) != 0)
(m_termios.c_lflag & ECHOE) != 0, << ", ISTRIP=" << ((m_termios.c_iflag & ISTRIP) != 0)
(m_termios.c_lflag & ECHOK) != 0, << ", ICRNL=" << ((m_termios.c_iflag & ICRNL) != 0)
(m_termios.c_lflag & ECHONL) != 0); << ", INLCR=" << ((m_termios.c_iflag & INLCR) != 0)
dbgprintf("%s set_termios: ISTRIP=%u, ICRNL=%u, INLCR=%u, IGNCR=%u\n", << ", IGNCR=" << ((m_termios.c_iflag & IGNCR) != 0);
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);
} }
int TTY::ioctl(FileDescription&, unsigned request, unsigned arg) 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 int ioctl(FileDescription&, unsigned request, unsigned arg) override final;
virtual String absolute_path(const FileDescription&) const override { return tty_name(); } 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 rows() const { return m_rows; }
unsigned short columns() const { return m_columns; } 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) : TTY(4, index)
, m_index(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); set_size(80, 25);
m_horizontal_tabs = static_cast<u8*>(kmalloc(columns())); m_horizontal_tabs = static_cast<u8*>(kmalloc(columns()));
for (unsigned i = 0; i < columns(); ++i) 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; return size;
} }
String VirtualConsole::tty_name() const StringView VirtualConsole::tty_name() const
{ {
return m_tty_name; return m_tty_name;
} }

4
Kernel/TTY/VirtualConsole.h
View file

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