Sockets and PTYs

This is a multi-part message in MIME format.
--------------040803090202010908030501
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit

Hi,

I hope there is someone present on this list. It looks like newer TCP/IP 
versions (beginning with around 4.2) at least partly break EMX support 
for xf86sup. After a socket is created, PTYs can't be opened any more. 
The attached code illustrates this. I first opens a PTY, then creates a 
socket, and then tries to open another PTY, which fails. I don't really 
know how the TCP/IP version can be causing this. The output of the 
program is:

[E:\x11_latest\xf86sup\example]socketpty
Successfully opened \dev\ptyp0, handle =5
Socket created, handle = 6
Cannot open pty \dev\ptyp1, errno = 5 (I/O error)

Any ideas, anybody?

Kind regards,
Frank.

-- 
  Frank Giessler
  Klinikum der Universitaet Jena               Tel.: +49-3641-9 32 57 80
  Biomagnetisches Zentrum                      Fax : +49-3641-9 32 57 72

--------------040803090202010908030501
Content-Type: image/x-xbitmap;
 name="socketpty.c"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="socketpty.c"

#define INCL_DOS
#define INCL_DOSPROCESS
#include <os2.h>

#include "../api/ptyos2.h"
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>

main()
{
	int i;
	int fdptms;
	int fd[2];
	int errcode = 1;

	APIRET rc;
	ULONG in = 1, len;
	char name[14];
	int Socket = -1;

	fd[0] = fd[1] = -1;
	
/* Open a PTY */

	if ((fdptms=open("/dev/ptms$",0)) <0) {
		errcode = errno;
		fprintf(stderr,"Cannot open /dev/ptms$, errno = %d (%s)\n",
		        errcode,strerror(errcode));
		goto cleanup;
	}

	rc = DosDevIOCtl(fdptms, XFREE86_PTY, PTMS_GETPTY,
		     &in, sizeof(ULONG), &len,
		     &name, sizeof(name), &len);
	if (rc) {
		fprintf(stderr,"Error PTMS_GETPTY: rc = %d\n",rc);
		goto cleanup;
	}
	fd[0] = open(name,0);
	if (fd[0]<0) {
		errcode = errno;
		fprintf(stderr,"Cannot open pty %s, errno = %d (%s)\n",
		        name,errcode,strerror(errcode));
	} else
		printf("Successfully opened %s, handle =%d\n",name,fd[0]);

/* Let's create a socket */

	if ((Socket = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
		errcode = errno;
		fprintf(stderr,"Failed to create socket, errno = %d (%s)\n",
		        errcode, strerror(errcode));
		goto cleanup; 
	}
	
	fprintf(stderr,"Socket created, handle = %d\n",Socket);

/* Open another PTY */

	rc = DosDevIOCtl(fdptms, XFREE86_PTY, PTMS_GETPTY,
		     &in, sizeof(ULONG), &len,
		     &name, sizeof(name), &len);
	if (rc) {
		fprintf(stderr,"Error PTMS_GETPTY: rc = %d\n",rc);
		goto cleanup;
	}
	fd[1] = open(name,0);
	if (fd[1]<0) {
		errcode = errno;
		fprintf(stderr,"Cannot open pty %s, errno = %d (%s)\n",
		        name,errcode,strerror(errcode));
	} else
		printf("Successfully opened %s, handle =%d\n",name,fd[1]);

	close (fdptms);


	/* cleanup all */
cleanup:
	for (i=0; i<2; i++)
		if (fd[i]>=0) close(fd[i]);
	shutdown(Socket,2);
	exit(errcode);
}

--------------040803090202010908030501--