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From: Andries Brouwer <>
To: Andrew Barton <>
Subject: Re: forkpty with streams
Date: Fri, 25 Jul 2003 17:27:51 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <1059089316.8596.14.camel@localhost>

On Thu, Jul 24, 2003 at 11:28:36PM +0000, Andrew Barton wrote:

> I've got the 2.4 kernel, and I'm trying to use the forkpty() system call

forkpty is not a system call

> with the standard I/O stream functions. The calls to forkpty() and
> fdopen() and fprintf() all return successfully, but the data never seems
> to get to the child process.

> 	pid = forkpty (&fd, 0, 0, 0);
> 	if (pid == 0) {
> 		execlp ("sh", "sh", (void *)0);
> 	} else {
> 		F = fdopen (fd, "w");
> 		fprintf (F, "exit\n");
> 		fflush (F);
> 		wait (0);
> 	}

Let me see. Your sh gets input from this pseudotty and sends its
output there again. But you never read that filedescriptor.
No doubt things will improve if you let the parent read from fd.


  parent reply	other threads:[~2003-07-25 15:12 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-24 23:28 forkpty with streams Andrew Barton
2003-07-25 13:02 ` Doug McNaught
2003-07-25 15:27 ` Andries Brouwer [this message]
2003-07-25 10:59   ` Andrew Barton
2003-07-25 18:46     ` Matti Aarnio
2003-07-25 12:53       ` Andrew Barton
2003-07-25 20:10     ` Andries Brouwer

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