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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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