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TIOCPKT mode of PTY is broken if ONLCR bit is cleared. 

* tty.h (class tty_min): Remove variable "write_error" to which any
	errors are not currently set at anywhere.
	(class tty): Add variable "column" for handling ONOCR.
	* tty.cc (tty::init): Add initialization code for variable "column".
	* fhandler.h (class fhandler_pty_master): Remove variable "need_nl"
	which is not necessary any more. "need_nl" was needed by OPOST process
	in fhandler_pty_master::process_slave_output().
	(class fhandler_pty_common): Add function process_opost_output() for
	handling post processing for OPOST in write process.
	* fhandler_tty.cc (fhandler_pty_master::process_slave_output): Count
	TIOCPKT control byte into length to be read in TIOCPKT mode. Move
	post processing for OPOST to write process. Remove code related to
	variable "write_error". Return with EIO error if slave is already
	closed.
	(fhandler_pty_master::fhandler_pty_master): Remove initialization
	code for variable "need_nl".
	(fhandler_pty_common::process_opost_output): Add this function for
	handling of OPOST in write process. Add code to avoid blocking in
	non-blocking mode when output is suspended by ^S.
	(fhandler_pty_slave::write): Call fhandler_pty_common::
	process_opost_output() instead of WriteFile(). Remove code related to
	variable "write_error".
	(fhandler_pty_master::doecho): Call fhandler_pty_common::
	 process_opost_output() instead of WriteFile().
	* select.cc (peek_pipe): Remove code related to variable "need_nl".

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Takashi Yano 2015-03-25 20:42:38 +09:00 committed by Corinna Vinschen
parent d70f57112f
commit c596f5b73c
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GPG Key ID: F536069DAE444FA0
7 changed files with 168 additions and 132 deletions
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28
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,31 @@
2015-03-25 Takashi Yano <takashi.yano@nifty.ne.jp>
* tty.h (class tty_min): Remove variable "write_error" to which any
errors are not currently set at anywhere.
(class tty): Add variable "column" for handling ONOCR.
* tty.cc (tty::init): Add initialization code for variable "column".
* fhandler.h (class fhandler_pty_master): Remove variable "need_nl"
which is not necessary any more. "need_nl" was needed by OPOST process
in fhandler_pty_master::process_slave_output().
(class fhandler_pty_common): Add function process_opost_output() for
handling post processing for OPOST in write process.
* fhandler_tty.cc (fhandler_pty_master::process_slave_output): Count
TIOCPKT control byte into length to be read in TIOCPKT mode. Move
post processing for OPOST to write process. Remove code related to
variable "write_error". Return with EIO error if slave is already
closed.
(fhandler_pty_master::fhandler_pty_master): Remove initialization
code for variable "need_nl".
(fhandler_pty_common::process_opost_output): Add this function for
handling of OPOST in write process. Add code to avoid blocking in
non-blocking mode when output is suspended by ^S.
(fhandler_pty_slave::write): Call fhandler_pty_common::
process_opost_output() instead of WriteFile(). Remove code related to
variable "write_error".
(fhandler_pty_master::doecho): Call fhandler_pty_common::
process_opost_output() instead of WriteFile().
* select.cc (peek_pipe): Remove code related to variable "need_nl".
2015-03-24 Corinna Vinschen <corinna@vinschen.de>
Per glibc BZ #15366:

5
winsup/cygwin/fhandler.h
View File

@ -1508,6 +1508,9 @@ class fhandler_pty_common: public fhandler_termios
copyto (fh);
return fh;
}
protected:
BOOL process_opost_output (HANDLE h, const void *ptr, ssize_t& len, bool is_echo);
};
class fhandler_pty_slave: public fhandler_pty_common
@ -1574,8 +1577,6 @@ class fhandler_pty_master: public fhandler_pty_common
DWORD dwProcessId; // Owner of master handles
public:
int need_nl; // Next read should start with \n
HANDLE get_echo_handle () const { return echo_r; }
/* Constructor */
fhandler_pty_master (int);

255
winsup/cygwin/fhandler_tty.cc
View File

@ -145,7 +145,8 @@ fhandler_pty_common::__release_output_mutex (const char *fn, int ln)
void
fhandler_pty_master::doecho (const void *str, DWORD len)
{
if (!WriteFile (echo_w, str, len, &len, NULL))
ssize_t towrite = len;
if (!process_opost_output (echo_w, str, towrite, true))
termios_printf ("Write to echo pipe failed, %E");
}
@ -217,10 +218,9 @@ int
fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on)
{
size_t rlen;
char outbuf[OUT_BUFFER_SIZE + 1];
char outbuf[OUT_BUFFER_SIZE];
DWORD n;
DWORD echo_cnt;
int column = 0;
int rc = 0;
flush_to_slave ();
@ -228,34 +228,8 @@ fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on
if (len == 0)
goto out;
if (need_nl)
{
/* We need to return a left over \n character, resulting from
\r\n conversion. Note that we already checked for FLUSHO and
output_stopped at the time that we read the character, so we
don't check again here. */
if (buf)
buf[0] = '\n';
need_nl = 0;
rc = 1;
goto out;
}
for (;;)
{
/* Set RLEN to the number of bytes to read from the pipe. */
rlen = len;
if (get_ttyp ()->ti.c_oflag & OPOST && get_ttyp ()->ti.c_oflag & ONLCR)
{
/* We are going to expand \n to \r\n, so don't read more than
half of the number of bytes requested. */
rlen /= 2;
if (rlen == 0)
rlen = 1;
}
if (rlen > sizeof outbuf)
rlen = sizeof outbuf;
n = echo_cnt = 0;
for (;;)
{
@ -267,7 +241,11 @@ fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on
if (n)
break;
if (hit_eof ())
goto out;
{
set_errno (EIO);
rc = -1;
goto out;
}
/* DISCARD (FLUSHO) and tcflush can finish here. */
if ((get_ttyp ()->ti.c_lflag & FLUSHO || !buf))
goto out;
@ -289,6 +267,26 @@ fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on
flush_to_slave ();
}
/* Set RLEN to the number of bytes to read from the pipe. */
rlen = len;
char *optr;
optr = buf;
if (pktmode_on && buf)
{
*optr++ = TIOCPKT_DATA;
rlen -= 1;
}
if (rlen == 0)
{
rc = optr - buf;
goto out;
}
if (rlen > sizeof outbuf)
rlen = sizeof outbuf;
/* If echo pipe has data (something has been typed or pasted), prefer
it over slave output. */
if (echo_cnt > 0)
@ -306,68 +304,12 @@ fhandler_pty_master::process_slave_output (char *buf, size_t len, int pktmode_on
}
termios_printf ("bytes read %u", n);
get_ttyp ()->write_error = 0;
if (get_ttyp ()->ti.c_lflag & FLUSHO || !buf)
continue;
char *optr;
optr = buf;
if (pktmode_on)
*optr++ = TIOCPKT_DATA;
if (!(get_ttyp ()->ti.c_oflag & OPOST)) // post-process output
{
memcpy (optr, outbuf, n);
optr += n;
}
else // raw output mode
{
char *iptr = outbuf;
while (n--)
{
switch (*iptr)
{
case '\r':
if ((get_ttyp ()->ti.c_oflag & ONOCR) && column == 0)
{
iptr++;
continue;
}
if (get_ttyp ()->ti.c_oflag & OCRNL)
*iptr = '\n';
else
column = 0;
break;
case '\n':
if (get_ttyp ()->ti.c_oflag & ONLCR)
{
*optr++ = '\r';
column = 0;
}
if (get_ttyp ()->ti.c_oflag & ONLRET)
column = 0;
break;
default:
column++;
break;
}
/* Don't store data past the end of the user's buffer. This
can happen if the user requests a read of 1 byte when
doing \r\n expansion. */
if (optr - buf >= (int) len)
{
if (*iptr != '\n' || n != 0)
system_printf ("internal error: %u unexpected characters", n);
need_nl = 1;
break;
}
*optr++ = *iptr++;
}
}
memcpy (optr, outbuf, n);
optr += n;
rc = optr - buf;
break;
@ -639,7 +581,6 @@ fhandler_pty_slave::init (HANDLE h, DWORD a, mode_t)
ssize_t __stdcall
fhandler_pty_slave::write (const void *ptr, size_t len)
{
DWORD n;
ssize_t towrite = len;
bg_check_types bg = bg_check (SIGTTOU);
@ -650,43 +591,19 @@ fhandler_pty_slave::write (const void *ptr, size_t len)
push_process_state process_state (PID_TTYOU);
while (len)
if (!process_opost_output (get_output_handle (), ptr, towrite, false))
{
n = MIN (OUT_BUFFER_SIZE, len);
char *buf = (char *)ptr;
ptr = (char *) ptr + n;
len -= n;
while (tc ()->output_stopped)
cygwait (10);
/* Previous write may have set write_error to != 0. Check it here.
This is less than optimal, but the alternative slows down pty
writes enormously. */
if (get_ttyp ()->write_error)
DWORD err = GetLastError ();
termios_printf ("WriteFile failed, %E");
switch (err)
{
set_errno (get_ttyp ()->write_error);
towrite = -1;
get_ttyp ()->write_error = 0;
break;
}
BOOL res = WriteFile (get_output_handle (), buf, n, &n, NULL);
if (!res)
{
DWORD err = GetLastError ();
termios_printf ("WriteFile failed, %E");
switch (err)
{
case ERROR_NO_DATA:
err = ERROR_IO_DEVICE;
default:
__seterrno_from_win_error (err);
}
raise (SIGHUP); /* FIXME: Should this be SIGTTOU? */
towrite = -1;
break;
case ERROR_NO_DATA:
err = ERROR_IO_DEVICE;
default:
__seterrno_from_win_error (err);
}
raise (SIGHUP); /* FIXME: Should this be SIGTTOU? */
towrite = -1;
}
return towrite;
}
@ -1225,7 +1142,7 @@ errout:
fhandler_pty_master::fhandler_pty_master (int unit)
: fhandler_pty_common (), pktmode (0), master_ctl (NULL),
master_thread (NULL), from_master (NULL), to_master (NULL),
echo_r (NULL), echo_w (NULL), dwProcessId (0), need_nl (0)
echo_r (NULL), echo_w (NULL), dwProcessId (0)
{
if (unit >= 0)
dev ().parse (DEV_PTYM_MAJOR, unit);
@ -1783,3 +1700,93 @@ fhandler_pty_master::fixup_after_exec ()
else
from_master = to_master = NULL;
}
BOOL
fhandler_pty_common::process_opost_output (HANDLE h, const void *ptr, ssize_t& len, bool is_echo)
{
ssize_t towrite = len;
BOOL res = TRUE;
while (towrite)
{
if (!is_echo)
{
if (tc ()->output_stopped && is_nonblocking ())
{
if (towrite < len)
break;
else
{
set_errno(EAGAIN);
len = -1;
return TRUE;
}
}
while (tc ()->output_stopped)
cygwait (10);
}
if (!(get_ttyp ()->ti.c_oflag & OPOST)) // raw output mode
{
DWORD n = MIN (OUT_BUFFER_SIZE, towrite);
res = WriteFile (h, ptr, n, &n, NULL);
if (!res)
break;
ptr = (char *) ptr + n;
towrite -= n;
}
else // post-process output
{
char outbuf[OUT_BUFFER_SIZE + 1];
char *buf = (char *)ptr;
DWORD n = 0;
ssize_t rc = 0;
acquire_output_mutex (INFINITE);
while (n < OUT_BUFFER_SIZE && rc < towrite)
{
switch (buf[rc])
{
case '\r':
if ((get_ttyp ()->ti.c_oflag & ONOCR)
&& get_ttyp ()->column == 0)
{
rc++;
continue;
}
if (get_ttyp ()->ti.c_oflag & OCRNL)
{
outbuf[n++] = '\n';
rc++;
}
else
{
outbuf[n++] = buf[rc++];
get_ttyp ()->column = 0;
}
break;
case '\n':
if (get_ttyp ()->ti.c_oflag & ONLCR)
{
outbuf[n++] = '\r';
get_ttyp ()->column = 0;
}
if (get_ttyp ()->ti.c_oflag & ONLRET)
get_ttyp ()->column = 0;
outbuf[n++] = buf[rc++];
break;
default:
outbuf[n++] = buf[rc++];
get_ttyp ()->column++;
break;
}
}
release_output_mutex ();
res = WriteFile (h, outbuf, n, &n, NULL);
if (!res)
break;
ptr = (char *) ptr + rc;
towrite -= rc;
}
}
len -= towrite;
return res;
}

4
winsup/cygwin/release/1.7.36
View File

@ -18,3 +18,7 @@ Bug Fixes
- Fix a name change from symlink to target name in calls to execvp, system, etc.
Addresses: https://cygwin.com/ml/cygwin/2015-03/msg00270.html
- Fix internal error in pty -ONLCR handling. Fix timing bug in pty OPOST
handling.
Addresses: https://cygwin.com/ml/cygwin/2015-02/msg00929.html

5
winsup/cygwin/select.cc
View File

@ -604,11 +604,6 @@ peek_pipe (select_record *s, bool from_select)
{
fhandler_pty_master *fhm = (fhandler_pty_master *) fh;
fhm->flush_to_slave ();
if (fhm->need_nl)
{
gotone = s->read_ready = true;
goto out;
}
}
break;
default:

1
winsup/cygwin/tty.cc
View File

@ -237,6 +237,7 @@ tty::init ()
was_opened = false;
master_pid = 0;
is_console = false;
column = 0;
}
HANDLE

2
winsup/cygwin/tty.h
View File

@ -67,7 +67,6 @@ public:
* -ERRNO
*/
int ioctl_retval;
int write_error;
void setntty (_major_t t, _minor_t n) {ntty = (fh_devices) FHDEV (t, n);}
dev_t getntty () const {return ntty;}
@ -117,6 +116,7 @@ public:
int read_retval;
bool was_opened; /* True if opened at least once. */
int column; /* Current Column */
void init ();
HANDLE open_inuse (ACCESS_MASK access);