🚀 go-pugleaf

voss@i40s16.ira.uka.de (Stefan Voss) writes:

>Hi C experts,

>thanx for the advice of converting '#pragma segement "foo"' to
>'segment "foo       ";'. Works great. Now the program I am trying to
>port to the GS (XLISP 2.0d) compiles and links with no errors.

>But, one error vanished and another has arised.
>The code that deals with the operating system (originally Unix, now GNO)
>uses a lot of IOCTL-stuff. Especially, there is a line

>if (gtty(0, &savetty) == -1) { ... }; \* savetty being a struct sgttyb *\

  GNO's stdin channel is file descriptor 1, not 0.  0 was already special-
cased by GS/OS to mean "close or flush all files" in the Close and Flush
calls. Grr. :)  To be 100% correct as of POSIX and BSD 4.4 #include
<unistd.h> and specify "gtty(STDIN_FILENO, ..)".  You'll see those
references all through the GNO sample code.

>with gtty as usual defined as : 
>#define gtty(fd, arg)    (ioctl(fd, TIOCGETP, arg))
>The call to gtty returns -1 (i.e. an error) with the variable 
>errno set to 20 (ENOTTY).

  Your conclusion is wrong, as is the error message.  Thanks for 
discovering that. :)

  The GNO console is in fact a TTY.
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