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Cygwin: console: Add guard for set/unset xterm compatible mode.

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- Setting / unsetting xterm compatible mode may cause race issue
  between multiple processes. This patch adds guard for that.
This commit is contained in:
Takashi Yano
2020-02-18 18:12:54 +09:00
committed by Corinna Vinschen
parent 321d79abd3
commit 81b3440998
4 changed files with 103 additions and 58 deletions
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125
winsup/cygwin/fhandler_console.cc
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@@ -53,8 +53,6 @@ fhandler_console::console_state NO_COPY *fhandler_console::shared_console_info;
bool NO_COPY fhandler_console::invisible_console;
static DWORD orig_conout_mode = (DWORD) -1;
/* con_ra is shared in the same process.
Only one console can exist in a process, therefore, static is suitable. */
static struct fhandler_base::rabuf_t con_ra;
@@ -162,13 +160,17 @@ fhandler_console::set_unit ()
tty_min_state.setntty (DEV_CONS_MAJOR, console_unit (me));
devset = (fh_devices) shared_console_info->tty_min_state.getntty ();
if (created)
con.owner = getpid ();
{
con.owner = myself->pid;
con.xterm_mode_input = 0;
con.xterm_mode_output = 0;
}
}
if (!created && shared_console_info)
{
pinfo p (con.owner);
if (!p)
con.owner = getpid ();
con.owner = myself->pid;
}
dev ().parse (devset);
@@ -247,6 +249,60 @@ fhandler_console::rabuflen ()
return con_ra.rabuflen;
}
void
fhandler_console::request_xterm_mode_input (bool req)
{
if (con_is_legacy)
return;
if (req)
{
if (InterlockedIncrement (&con.xterm_mode_input) == 1)
{
DWORD dwMode;
GetConsoleMode (get_handle (), &dwMode);
dwMode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
SetConsoleMode (get_handle (), dwMode);
}
}
else
{
if (InterlockedDecrement (&con.xterm_mode_input) == 0)
{
DWORD dwMode;
GetConsoleMode (get_handle (), &dwMode);
dwMode &= ~ENABLE_VIRTUAL_TERMINAL_INPUT;
SetConsoleMode (get_handle (), dwMode);
}
}
}
void
fhandler_console::request_xterm_mode_output (bool req)
{
if (con_is_legacy)
return;
if (req)
{
if (InterlockedExchange (&con.xterm_mode_output, 1) == 0)
{
DWORD dwMode;
GetConsoleMode (get_output_handle (), &dwMode);
dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
SetConsoleMode (get_output_handle (), dwMode);
}
}
else
{
if (InterlockedExchange (&con.xterm_mode_output, 0) == 1)
{
DWORD dwMode;
GetConsoleMode (get_output_handle (), &dwMode);
dwMode &= ~ENABLE_VIRTUAL_TERMINAL_PROCESSING;
SetConsoleMode (get_output_handle (), dwMode);
}
}
}
/* Return the tty structure associated with a given tty number. If the
tty number is < 0, just return a dummy record. */
tty_min *
@@ -347,8 +403,8 @@ fhandler_console::set_cursor_maybe ()
/* Workaround for a bug of windows xterm compatible mode. */
/* The horizontal tab positions are broken after resize. */
static void
fix_tab_position (HANDLE h, SHORT width)
void
fhandler_console::fix_tab_position (void)
{
char buf[2048] = {0,};
/* Save cursor position */
@@ -356,15 +412,13 @@ fix_tab_position (HANDLE h, SHORT width)
/* Clear all horizontal tabs */
__small_sprintf (buf+strlen (buf), "\033[3g");
/* Set horizontal tabs */
for (int col=8; col<width; col+=8)
for (int col=8; col<con.dwWinSize.X; col+=8)
__small_sprintf (buf+strlen (buf), "\033[%d;%dH\033H", 1, col+1);
/* Restore cursor position */
__small_sprintf (buf+strlen (buf), "\0338");
DWORD dwMode;
GetConsoleMode (h, &dwMode);
SetConsoleMode (h, dwMode | ENABLE_VIRTUAL_TERMINAL_PROCESSING);
request_xterm_mode_output (true);
DWORD dwLen;
WriteConsole (h, buf, strlen (buf), &dwLen, 0);
WriteConsole (get_output_handle (), buf, strlen (buf), &dwLen, 0);
}
bool
@@ -379,7 +433,7 @@ fhandler_console::send_winch_maybe ()
con.scroll_region.Top = 0;
con.scroll_region.Bottom = -1;
if (wincap.has_con_24bit_colors () && !con_is_legacy)
fix_tab_position (get_output_handle (), con.dwWinSize.X);
fix_tab_position ();
get_ttyp ()->kill_pgrp (SIGWINCH);
return true;
}
@@ -427,11 +481,9 @@ fhandler_console::read (void *pv, size_t& buflen)
set_input_state ();
DWORD dwMode;
GetConsoleMode (get_handle (), &dwMode);
/* if system has 24 bit color capability, use xterm compatible mode. */
if (wincap.has_con_24bit_colors () && !con_is_legacy)
SetConsoleMode (get_handle (), dwMode | ENABLE_VIRTUAL_TERMINAL_INPUT);
if (wincap.has_con_24bit_colors ())
request_xterm_mode_input (true);
while (!input_ready && !get_cons_readahead_valid ())
{
@@ -439,7 +491,8 @@ fhandler_console::read (void *pv, size_t& buflen)
if ((bgres = bg_check (SIGTTIN)) <= bg_eof)
{
buflen = bgres;
SetConsoleMode (get_handle (), dwMode); /* Restore */
if (wincap.has_con_24bit_colors ())
request_xterm_mode_input (false);
return;
}
@@ -457,7 +510,8 @@ fhandler_console::read (void *pv, size_t& buflen)
case WAIT_TIMEOUT:
set_sig_errno (EAGAIN);
buflen = (size_t) -1;
SetConsoleMode (get_handle (), dwMode); /* Restore */
if (wincap.has_con_24bit_colors ())
request_xterm_mode_input (false);
return;
default:
goto err;
@@ -505,19 +559,22 @@ fhandler_console::read (void *pv, size_t& buflen)
#undef buf
buflen = copied_chars;
SetConsoleMode (get_handle (), dwMode); /* Restore */
if (wincap.has_con_24bit_colors ())
request_xterm_mode_input (false);
return;
err:
__seterrno ();
buflen = (size_t) -1;
SetConsoleMode (get_handle (), dwMode); /* Restore */
if (wincap.has_con_24bit_colors ())
request_xterm_mode_input (false);
return;
sig_exit:
set_sig_errno (EINTR);
buflen = (size_t) -1;
SetConsoleMode (get_handle (), dwMode); /* Restore */
if (wincap.has_con_24bit_colors ())
request_xterm_mode_input (false);
}
fhandler_console::input_states
@@ -1051,10 +1108,7 @@ fhandler_console::open (int flags, mode_t)
get_ttyp ()->rstcons (false);
set_open_status ();
if (orig_conout_mode == (DWORD) -1)
GetConsoleMode (get_output_handle (), &orig_conout_mode);
if (getpid () == con.owner && wincap.has_con_24bit_colors ())
if (myself->pid == con.owner && wincap.has_con_24bit_colors ())
{
bool is_legacy = false;
DWORD dwMode;
@@ -1105,15 +1159,9 @@ fhandler_console::close ()
acquire_output_mutex (INFINITE);
if (shared_console_info && getpid () == con.owner &&
if (shared_console_info && myself->pid == con.owner &&
wincap.has_con_24bit_colors () && !con_is_legacy)
{
DWORD dwMode;
/* Disable xterm compatible mode in output */
GetConsoleMode (get_output_handle (), &dwMode);
dwMode &= ~ENABLE_VIRTUAL_TERMINAL_PROCESSING;
SetConsoleMode (get_output_handle (), dwMode);
}
request_xterm_mode_output (false);
/* Restore console mode if this is the last closure. */
OBJECT_BASIC_INFORMATION obi;
@@ -1121,8 +1169,8 @@ fhandler_console::close ()
status = NtQueryObject (get_handle (), ObjectBasicInformation,
&obi, sizeof obi, NULL);
if (NT_SUCCESS (status) && obi.HandleCount == 1)
if (orig_conout_mode != (DWORD) -1)
SetConsoleMode (get_output_handle (), orig_conout_mode);
if (wincap.has_con_24bit_colors ())
request_xterm_mode_output (false);
release_output_mutex ();
@@ -1295,6 +1343,8 @@ fhandler_console::output_tcsetattr (int, struct termios const *t)
/* All the output bits we can ignore */
acquire_output_mutex (INFINITE);
if (wincap.has_con_24bit_colors ())
request_xterm_mode_output (false);
DWORD flags = ENABLE_PROCESSED_OUTPUT | ENABLE_WRAP_AT_EOL_OUTPUT;
int res = SetConsoleMode (get_output_handle (), flags) ? 0 : -1;
@@ -1765,7 +1815,7 @@ bool fhandler_console::write_console (PWCHAR buf, DWORD len, DWORD& done)
}
/* Call fix_tab_position() if screen has been alternated. */
if (need_fix_tab_position)
fix_tab_position (get_output_handle (), con.dwWinSize.X);
fix_tab_position ();
return true;
}
@@ -2733,11 +2783,12 @@ fhandler_console::write (const void *vsrc, size_t len)
acquire_output_mutex (INFINITE);
/* If system has 24 bit color capability, use xterm compatible mode. */
if (wincap.has_con_24bit_colors ())
request_xterm_mode_output (true);
if (wincap.has_con_24bit_colors () && !con_is_legacy)
{
DWORD dwMode;
GetConsoleMode (get_output_handle (), &dwMode);
dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
if (!(get_ttyp ()->ti.c_oflag & OPOST) ||
!(get_ttyp ()->ti.c_oflag & ONLCR))
dwMode |= DISABLE_NEWLINE_AUTO_RETURN;