Re: Calling process with pipes

[günther <guenther rapp-informatik de>]

  int  fd_in, fd_out;           /* file descriptor for fifo */
pid_t pid;                      /* prozess id */
FILE * fifoout;
FILE * fifoin;
char buf_out[256];
char buf_in[256];

  pid = getpid();
  sprintf(buf_out,"/tmp/LEX%d",pid);
  sprintf(buf_in,"/tmp/LEX%d",pid);
  i = mkfifo(buf_out, 0600);
  if ( i < 0 )
        fprintf(stderr,"mkfifo %s failed %d\n",buf_out,errno);

/*  j = mkfifo(buf_in, 0600);
  if ( j < 0 )
        fprintf(stderr,"mkfifo %s failed %d\n",buf_out,errno);
*/

  fd_out = open(buf_out,O_RDWR | O_NDELAY);
  if ( fd_out < 0 )
        fprintf(stderr,"open %s failed %d\n",buf_out,errno);
  fd_in = open(buf_out,O_RDONLY );
  if ( fd_in < 0 )
        fprintf(stderr,"open %s failed %d\n",buf_in,errno);
  fifoout = fdopen(fd_out,"a");
  if (!fifoout)
        fprintf(stderr,"fdopen write failed %d\n",errno);
  fifoin = fdopen(fd_in,"r");
  if (!fifoin)
        fprintf(stderr,"fdopen read failed %d\n",errno);
   
and use freopen to assign stdout to fifoout
                                                                         
Xavier Amado wrote:
> 
> I would need to execute a program (using g_spawn_async_with_pipes) and
> pass it's output to a second process. I'm not sure how to use the
> std_output in the above function though. Can anyone give me a simple
> example to do something like, for example, ls | grep root
> Thanks in advance.
> 
> Regards,
> Xavier
> 
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list@gnome.org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list

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