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Cygwin: pty: Avoid screen distortion on slave read. 

- Echo back print is distorted when the cygwin program which calls
  Win32 console API directly calls slave read(). This patch fixes
  the issue.
This commit is contained in:
Takashi Yano 2020-02-09 23:46:01 +09:00 committed by Corinna Vinschen
parent 2bae159171
commit b0474b704a
2 changed files with 32 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
winsup/cygwin/fhandler.h
View File

@ -2206,7 +2206,7 @@ class fhandler_pty_slave: public fhandler_pty_common
}
void set_switch_to_pcon (int fd);
void reset_switch_to_pcon (void);
void push_to_pcon_screenbuffer (const char *ptr, size_t len);
void push_to_pcon_screenbuffer (const char *ptr, size_t len, bool is_echo);
void mask_switch_to_pcon_in (bool mask);
void fixup_after_attach (bool native_maybe, int fd);
bool is_line_input (void)
@ -2215,6 +2215,7 @@ class fhandler_pty_slave: public fhandler_pty_common
}
void setup_locale (void);
void set_freeconsole_on_close (bool val);
void trigger_redraw_screen (void);
void wait_pcon_fwd (void);
};

51
winsup/cygwin/fhandler_tty.cc
View File

@ -80,7 +80,13 @@ set_switch_to_pcon (void)
fhandler_base *fh = cfd;
fhandler_pty_slave *ptys = (fhandler_pty_slave *) fh;
if (ptys->get_pseudo_console ())
ptys->set_switch_to_pcon (fd);
{
ptys->set_switch_to_pcon (fd);
ptys->trigger_redraw_screen ();
DWORD mode =
ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT;
SetConsoleMode (ptys->get_handle (), mode);
}
}
}
@ -1097,9 +1103,6 @@ fhandler_pty_slave::set_switch_to_pcon (int fd_set)
if (!try_reattach_pcon ())
goto skip_console_setting;
FlushConsoleInputBuffer (get_handle ());
DWORD mode;
mode = ENABLE_PROCESSED_INPUT | ENABLE_LINE_INPUT | ENABLE_ECHO_INPUT;
SetConsoleMode (get_handle (), mode);
skip_console_setting:
restore_reattach_pcon ();
if (get_ttyp ()->pcon_pid == 0 ||
@ -1160,7 +1163,8 @@ fhandler_pty_slave::reset_switch_to_pcon (void)
}
void
fhandler_pty_slave::push_to_pcon_screenbuffer (const char *ptr, size_t len)
fhandler_pty_slave::push_to_pcon_screenbuffer (const char *ptr, size_t len,
bool is_echo)
{
bool attached =
!!fhandler_console::get_console_process_id (get_helper_process_id (), true);
@ -1231,7 +1235,7 @@ fhandler_pty_slave::push_to_pcon_screenbuffer (const char *ptr, size_t len)
}
if (!nlen) /* Nothing to be synchronized */
goto cleanup;
if (get_ttyp ()->switch_to_pcon_out)
if (get_ttyp ()->switch_to_pcon_out && !is_echo)
goto cleanup;
/* Remove ESC sequence which returns results to console
input buffer. Without this, cursor position report
@ -1388,7 +1392,7 @@ fhandler_pty_slave::write (const void *ptr, size_t len)
if (get_pseudo_console ())
{
acquire_output_mutex (INFINITE);
push_to_pcon_screenbuffer ((char *)ptr, len);
push_to_pcon_screenbuffer ((char *)ptr, len, false);
release_output_mutex ();
}
@ -1716,7 +1720,9 @@ out:
if (get_pseudo_console () && ptr0 && (get_ttyp ()->ti.c_lflag & ECHO))
{
acquire_output_mutex (INFINITE);
push_to_pcon_screenbuffer (ptr0, len);
push_to_pcon_screenbuffer (ptr0, len, true);
if (get_ttyp ()->switch_to_pcon_out)
trigger_redraw_screen ();
release_output_mutex ();
}
mask_switch_to_pcon_in (false);
@ -2700,6 +2706,21 @@ fhandler_pty_slave::wait_pcon_fwd (void)
cygwait (get_ttyp ()->fwd_done, INFINITE);
}
void
fhandler_pty_slave::trigger_redraw_screen (void)
{
/* Forcibly redraw screen based on console screen buffer. */
/* The following code triggers redrawing the screen. */
CONSOLE_SCREEN_BUFFER_INFO sbi;
GetConsoleScreenBufferInfo (get_output_handle (), &sbi);
SMALL_RECT rect = {0, 0,
(SHORT) (sbi.dwSize.X -1), (SHORT) (sbi.dwSize.Y - 1)};
COORD dest = {0, 0};
CHAR_INFO fill = {' ', 0};
ScrollConsoleScreenBuffer (get_output_handle (), &rect, NULL, dest, &fill);
get_ttyp ()->need_redraw_screen = false;
}
void
fhandler_pty_slave::fixup_after_attach (bool native_maybe, int fd_set)
{
@ -2754,19 +2775,7 @@ fhandler_pty_slave::fixup_after_attach (bool native_maybe, int fd_set)
get_ttyp ()->switch_to_pcon_out = true;
if (get_ttyp ()->need_redraw_screen)
{
/* Forcibly redraw screen based on console screen buffer. */
/* The following code triggers redrawing the screen. */
CONSOLE_SCREEN_BUFFER_INFO sbi;
GetConsoleScreenBufferInfo (get_output_handle (), &sbi);
SMALL_RECT rect = {0, 0,
(SHORT) (sbi.dwSize.X -1), (SHORT) (sbi.dwSize.Y - 1)};
COORD dest = {0, 0};
CHAR_INFO fill = {' ', 0};
ScrollConsoleScreenBuffer (get_output_handle (),
&rect, NULL, dest, &fill);
get_ttyp ()->need_redraw_screen = false;
}
trigger_redraw_screen ();
}
init_console_handler (false);
}