[Linux-streams] Fwd: fattach failed on application without super user privilege

[David Grothe]

I'm not an fattach specialist, so maybe someone else can answer this.
-- Dave
Subject: fattach failed on application without super user privilege
To: [EMAIL PROTECTED]
From: [EMAIL PROTECTED]
Date: Thu, 25 Sep 2003 09:59:18 -0400
Hi,
I have an application running with LiS-2.16/Linux 2.4.18. The application
create named pipe, and push connld, and attach it (the program showed in
belows). It always failed on the calling fattach fucntion if the
application does not have super-user privilege. I tried fattach utility and
got the same result ("Operation is not permitted"). If the application run
on the super user mode, it succeeded. I need my application run on
non-super user mode, how can I do it ? Thanks
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <memory.h>
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include <stropts.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysmacros.h>
#include <sys/ioctl.h>
int main( int argc, char *argv[] )
{
      int fd[2];
      if (pipe(fd) < 0)  {
            fprintf( stderr,
                  "pipe() failed: %s\n", strerror(errno) );
            exit(1);
      }
      fcntl(fd[1], F_SETFL, O_NONBLOCK);
      mknod("pipe1", S_IFIFO | 0666, 0);
      if (ioctl( fd[1], I_PUSH, "connld" ) < 0) {
            fprintf( stderr,
                  "ioctl( %d, I_PUSH, connld ) failed: %s\n",
                  fd[1], strerror(errno) );
            exit(1);
      }
      if (fattach( fd[1], "pipe1" ) < 0) {
            fprintf( stderr, "fattach( %d, \"pipe1\" ) failed: %d %s\n",
                  fd[1], errno, strerror(errno) );
            exit(1);
      }
      close(fd[0]);
      close(fd[1]);
      exit(0);
}


Frank Chi
Senior Programming Engineer
Ingenico Atlanta
(678) 795-2850 Direct
(770) 594-6003 Fax


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