rogers@ncrcce.StPaul.NCR.COM (Bob Rogers) (12/17/89)
I've modified the MicroEMACS that came with the Mark Williams C compiler to
read standard input (e.g., you can put it at the end of the pipe and then
view/edit the stuff that came out the pipe). Is there any way to re-connect
the console to standard input so that a program (which itself used standard
input) run from within the editor via system() will operate correctly?
In UNIX this is done by:
tty = open("/dev/tty", 0);
close(0);
dup(tty);
system("whatever"); /* "whatever" now has access to proper stdin */
I've tried a similar technique using the ST's "con:" device in place of
/dev/tty but to no avail. Can anyone offer a solution?
--
----
Bob Rogers rogers@stpaul.ncr.com or rogers@pnet51.cts.com
NCR Comten, St. Paul, MN GEnie: R.C.ROGERSpiet@cs.ruu.nl (Piet van Oostrum) (12/18/89)
In article <1787@ncrcce.StPaul.NCR.COM>, rogers@ncrcce (Bob Rogers) writes:
`I've modified the MicroEMACS that came with the Mark Williams C compiler to
`read standard input (e.g., you can put it at the end of the pipe and then
`view/edit the stuff that came out the pipe). Is there any way to re-connect
`the console to standard input so that a program (which itself used standard
`input) run from within the editor via system() will operate correctly?
`
`In UNIX this is done by:
` tty = open("/dev/tty", 0);
` close(0);
` dup(tty);
` system("whatever"); /* "whatever" now has access to proper stdin */
`
`I've tried a similar technique using the ST's "con:" device in place of
`/dev/tty but to no avail. Can anyone offer a solution?
Fforce (0, -1) or Fforce (0, Fopen ("con:", 0));
--
Piet* van Oostrum, Dept of Computer Science, Utrecht University,
Padualaan 14, P.O. Box 80.089, 3508 TB Utrecht, The Netherlands.
Telephone: +31-30-531806 Uucp: uunet!mcsun!hp4nl!ruuinf!piet
Telefax: +31-30-513791 Internet: piet@cs.ruu.nl (*`Pete')john@dynasoft.UUCP (John Stanley) (12/21/89)
[piet@cs.ruu.nl (Piet van Oostrum) writes...] > In article <1787@ncrcce.StPaul.NCR.COM>, rogers@ncrcce (Bob Rogers) writes: > `I've tried a similar technique using the ST's "con:" device in place of > `/dev/tty but to no avail. Can anyone offer a solution? > > Fforce (0, -1) or Fforce (0, Fopen ("con:", 0)); The first one should work, but the 2nd one has a few problems. Better to use Fforce(0, (int)Fopen("con:", 0)); if you have to use this method. The example Piet gave will (on many compilers) push a long onto the stack where Fforce expects an int... Fopen "really" returns a long for some librarys.. In actual practice, I'd avoid using the 2nd form altogether since it uses up a file handle that isn't going to be freeded until the program exits. Do a bunch of these calls and you'd suddenly discover your program couldn't open any more files... --- John Stanley <john@dynasoft.UUCP> Software Consultant / Dynasoft Systems