trouble using a PTY
Fred_Smith@computrition.com
Fred_Smith@computrition.com
Sun Nov 3 05:08:00 GMT 2002
I'm trying to run some very simple code that uses ptys. The
code is from W. Richard Stevens APUE book. The only change is
the printf you see below. In this routine:
int
ptym_open(char *pts_name)
{
int fdm;
char *ptr1, *ptr2;
strcpy(pts_name, "/dev/ptyXY");
/* array index: 0123456789 (for references in following code) */
for (ptr1 = "pqrstuvwxyzPQRST"; *ptr1 != 0; ptr1++) {
pts_name[8] = *ptr1;
for (ptr2 = "0123456789abcdef"; *ptr2 != 0; ptr2++) {
pts_name[9] = *ptr2;
/* try to open master */
if ( (fdm = open(pts_name, O_RDWR)) < 0) {
printf ("ptym_open, open returned errno of: %d, pts_name=%s\n",
errno,pts_name);
if (errno == ENOENT) /* different from
EIO */
return(-1); /*out of pty devices
*/
else
continue; /*try next pty device
*/
}
pts_name[5] = 't'; /* change "pty" to "tty" */
return(fdm); /* got it, return fd of
master */
}
}
printf ("pty, at end, errno is: %d\n", errno);
return(-1); /* out of pty devices */
}
the first call to open() fails, and the printf produces:
ptym_open, open returned errno of: 2, pts_name=/dev/ptyp0
As far as I can deduce by reading cygwin docs and mailing list archives,
PTYs would be expected to work.
I'd appreciate it if someone could point me in the right direction here.
attached is output of "cygcheck -s"
Thanks!
fred
(See attached file: cygcheck.out)
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