Re: XITE under CYGWIN gives pty errors
Rob van Aarle wrote: > with these relevant comments: > 'XptyStartProgram' allocates a pty (pseudo terminal) (either > by calling system function '_getpty' (if source is compiled > with GETPTY defined)) or by trying to open devices /dev/ptyxy > (master) and /dev/ttyxy (slave) (where "x" is one of the > characters "pqrstuvwxyz", "y" is one of the characters > "0123456789abcdef"). This is the old traditional BSD way of allocating ptys. However, I believe that Cygwin only supports the newer Unix98 method. Instead of searching for a free device, you just open /dev/ptmx and you are assigned a file descriptor for the master. Then you call ptsname() to get the pathname of the slave, and then open it. I'm sure if you do a little googling (or searching through Cygwin sources for e.g. rxvt or xterm) you can find some code snippets of how this is done. Brian -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Re: XITE under CYGWIN gives pty errors
At 10:27 AM 3/14/2004, you wrote:
>Hello,
>
>As a project we need to run XITE
>(http://www.ifi.uio.no/forskning/grupper/dsb/Programvare/Xite/) under
>Windows. All sources of XITE can be compiled with Visual Studio, except the
>ones that use a GUI. So we decided to use Cygwin to run XITE. The
>installation of XITE was not without problems, but with some adaptation of
>the installation scripts we succeeded.
>XITE is a collection of console based functions which performs
>transformations to images. There is one application, xshow, that uses a GUI
>to perform these transformations. It just calls the other function with the
>right params. This is where it goes wrong, when calling such a function
>xshow gives this error:
>
>xshow error: getpty: No free ptys.
How are you running this? From where? Are you in X or not? What X server
are you running? So far, you haven't really given much detail to what you've
done to produce this result.
>Of course we searched on this on Google, but we could not find an answer to
>solve this. So tried to find the code which generates this error. This is
>what we found:
>
>#ifdef GETPTY
>/* SGI has a library function called _getpty() */
> char *_getpty(int *, int, mode_t, int);
> int filedes[2];
> char *line;
>
> ENTER_FUNCTION_DEBUG("Xpty.c: getpty");
>
> line = _getpty(filedes, O_RDWR, 0600, 0);
> if (line == NULL) {
>Error(2, "getpty: Couldn't find pty, %s.\n", strerror(errno));
>return(-1);
> }
> if ((filedes[1] = open(line, O_RDWR)) < 0 ) {
>Error(2, "getpty: Couldn't open slave read/write, %s.\n",
>strerror(errno));
>close(filedes[0]);
>return(-1);
> }
> *master = filedes[0];
> *slave = filedes[1];
>
> LEAVE_FUNCTION_DEBUG("Xpty.c: getpty");
>
> return(0);
>
>#else /* GETPTY */
> int first;
>
> ENTER_FUNCTION_DEBUG("Xpty.c: getpty");
>
> first = 0;
> for(; *ptyl1_s; ptyl1_s[1] ? ptyl1_s++ : (ptyl1_s = PTYCHAR1)) {
>ttydev_s[tlen_s-2] = ptydev_s[plen_s-2] = *ptyl1_s;
>
>for(ptyl2_s = *ptyl2_s ? ptyl2_s : PTYCHAR2; *ptyl2_s; ptyl2_s++) {
> ttydev_s[tlen_s-1] = ptydev_s[plen_s-1] = *ptyl2_s;
> *master = open(ptydev_s, O_RDWR);
>
> if (*master >= 0) {
>
> if (access(ttydev_s, R_OK|W_OK) == 0) {
> FPRINTF3("ttydev_s: %s ptydev_s: %s\n",
> ttydev_s, ptydev_s);
> *slave = open(ttydev_s, O_RDWR);
> if (*slave < 0) {
> Error(2, "getpty: Couldn't open slave %s read/write, %s.\n",
>ttydev_s, strerror(errno));
> }
> LEAVE_FUNCTION_DEBUG("Xpty.c: getpty");
>
> return(0);
> } else {
> FPRINTF3("getpty: Couldn't access slave %s read/write, %s.\n",
> ttydev_s, strerror(errno));
> close(*master);
> }
> } else {
> FPRINTF3("getpty: Couldn't open master %s read/write, %s.\n",
> ptydev_s, strerror(errno));
> }
>}
>first ++;
>if (first > strlen(PTYCHAR1)) break;
> }
> Error(2, "getpty: No free ptys.\n");
>
> return(-1);
>
>#endif /* GETPTY */
>
>with these relevant comments:
>'XptyStartProgram' allocates a pty (pseudo terminal) (either
> by calling system function '_getpty' (if source is compiled
> with GETPTY defined)) or by trying to open devices /dev/ptyxy
> (master) and /dev/ttyxy (slave) (where "x" is one of the
> characters "pqrstuvwxyz", "y" is one of the characters
> "0123456789abcdef").
>
>As we are not hardcore UNIX/LINUX users, we don't know much about pty.
>Searching with google gave us the definition 'pseudo terminal' and
>apparently there are limited available of these. Because we get the error
>'No free ptys' and looking at the code it seems GETPTY is not defined, so
>according to the comments this code is trying to open /dev/ttyxy and
>/dev/ptyxy. But there is no /dev directory at our Cygwin installation (so
>there isn't a ttyxy or ptyxy either).
You missed some important Cygwin documentation at:
So, ptty support does exist in Cygwin. This may also be of interest:
>So our question is, which package should we install to get these files? And
>will this solve our problem, or does someone have an other suggestion to
>solve this?
As the User's Guide points out, you're not missing these files. If the
information I've pointed you to doesn't help and you need to consult the
list again, please the reporting guidelines enumerated here:
>Problem reports: http://cygwin.com/problems.html
This will help folks on the list pinpoint your problem better.
--
Larry Hall http://www.rfk.com
RFK Partners, Inc. (508) 893-9779 - RFK Office
838 Washington Street (508) 893-9889 - FAX
Holliston, MA 01746
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XITE under CYGWIN gives pty errors
Hello,
As a project we need to run XITE
(http://www.ifi.uio.no/forskning/grupper/dsb/Programvare/Xite/) under
Windows. All sources of XITE can be compiled with Visual Studio, except the
ones that use a GUI. So we decided to use Cygwin to run XITE. The
installation of XITE was not without problems, but with some adaptation of
the installation scripts we succeeded.
XITE is a collection of console based functions which performs
transformations to images. There is one application, xshow, that uses a GUI
to perform these transformations. It just calls the other function with the
right params. This is where it goes wrong, when calling such a function
xshow gives this error:
xshow error: getpty: No free ptys.
Of course we searched on this on Google, but we could not find an answer to
solve this. So tried to find the code which generates this error. This is
what we found:
#ifdef GETPTY
/* SGI has a library function called _getpty() */
char *_getpty(int *, int, mode_t, int);
int filedes[2];
char *line;
ENTER_FUNCTION_DEBUG("Xpty.c: getpty");
line = _getpty(filedes, O_RDWR, 0600, 0);
if (line == NULL) {
Error(2, "getpty: Couldn't find pty, %s.\n", strerror(errno));
return(-1);
}
if ((filedes[1] = open(line, O_RDWR)) < 0 ) {
Error(2, "getpty: Couldn't open slave read/write, %s.\n",
strerror(errno));
close(filedes[0]);
return(-1);
}
*master = filedes[0];
*slave = filedes[1];
LEAVE_FUNCTION_DEBUG("Xpty.c: getpty");
return(0);
#else /* GETPTY */
int first;
ENTER_FUNCTION_DEBUG("Xpty.c: getpty");
first = 0;
for(; *ptyl1_s; ptyl1_s[1] ? ptyl1_s++ : (ptyl1_s = PTYCHAR1)) {
ttydev_s[tlen_s-2] = ptydev_s[plen_s-2] = *ptyl1_s;
for(ptyl2_s = *ptyl2_s ? ptyl2_s : PTYCHAR2; *ptyl2_s; ptyl2_s++) {
ttydev_s[tlen_s-1] = ptydev_s[plen_s-1] = *ptyl2_s;
*master = open(ptydev_s, O_RDWR);
if (*master >= 0) {
if (access(ttydev_s, R_OK|W_OK) == 0) {
FPRINTF3("ttydev_s: %s ptydev_s: %s\n",
ttydev_s, ptydev_s);
*slave = open(ttydev_s, O_RDWR);
if (*slave < 0) {
Error(2, "getpty: Couldn't open slave %s read/write, %s.\n",
ttydev_s, strerror(errno));
}
LEAVE_FUNCTION_DEBUG("Xpty.c: getpty");
return(0);
} else {
FPRINTF3("getpty: Couldn't access slave %s read/write, %s.\n",
ttydev_s, strerror(errno));
close(*master);
}
} else {
FPRINTF3("getpty: Couldn't open master %s read/write, %s.\n",
ptydev_s, strerror(errno));
}
}
first ++;
if (first > strlen(PTYCHAR1)) break;
}
Error(2, "getpty: No free ptys.\n");
return(-1);
#endif /* GETPTY */
with these relevant comments:
'XptyStartProgram' allocates a pty (pseudo terminal) (either
by calling system function '_getpty' (if source is compiled
with GETPTY defined)) or by trying to open devices /dev/ptyxy
(master) and /dev/ttyxy (slave) (where "x" is one of the
characters "pqrstuvwxyz", "y" is one of the characters
"0123456789abcdef").
As we are not hardcore UNIX/LINUX users, we don't know much about pty.
Searching with google gave us the definition 'pseudo terminal' and
apparently there are limited available of these. Because we get the error
'No free ptys' and looking at the code it seems GETPTY is not defined, so
according to the comments this code is trying to open /dev/ttyxy and
/dev/ptyxy. But there is no /dev directory at our Cygwin installation (so
there isn't a ttyxy or ptyxy either).
So our question is, which package should we install to get these files? And
will this solve our problem, or does someone have an other suggestion to
solve this?
--
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Documentation: http://cygwin.com/docs.html
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