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Date: Thu, 30 Apr 2009 19:25:31 +0900 (JST)
From: neomjp <neomjp AT yahoo DOT co DOT jp>
Subject: luit-1.0.3-1: Couldn't allocate pty: No such file or directory
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$ cygcheck -c luit
Cygwin Package Information
Package              Version        Status
luit                 1.0.3-1        OK

$ /usr/bin/luit.exe
Couldn't allocate pty: No such file or directory

This error is caused by trying to opening a pseudo terminal in a BSD
way (instead of in a SVR4 or Unix-98 way). Here are the relevant parts
in sys.c:

#if (defined(__GLIBC__) && \
     (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))) || \
    defined(SVR4)
#define HAVE_GRANTPT
#endif
...............................
int
allocatePty(int *pty_return, char **line_return)
{
   char name[12], *line = NULL;
    int pty = -1;
    char *name1 = "pqrstuvwxyzPQRST",
        *name2 = "0123456789abcdefghijklmnopqrstuv";
...............................
#ifdef HAVE_GRANTPT
................................
    pty = open("/dev/ptmx", O_RDWR);
.....................................
#endif /* HAVE_GRANTPT */

    strcpy(name, "/dev/pty??");
    for(p1 = name1; *p1; p1++) {
        name[8] = *p1;
        for(p2 = name2; *p2; p2++) {
            name[9] = *p2;
            pty = open(name, O_RDWR);

In cygwin, the absense of __GLIBC__ or SVR4 causes HAVE_GRANTPT to be
undefined, and so the codes to use SVR4 (or Unix-98) pseudo terminals
are not enabled.

	A simple fix is to add "|| defined(__CYGWIN__)",
but the recent master of luit has a better fix. It replaced "#if
(defined(__GLIBC__) && ..." with a real configure test for grantpt.
http://cgit.freedesktop.org/xorg/app/luit/commit/?h=4823838f77ab03cccd07860fdf8002bc577e0f04

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