Hi, i'm doing a fork() on my program, while my
child process does a ssh tunneling then parent process
doing vncviwer. when i run my program, my console will
output the result of ssh and then go to the prompt to the
machine that be tunneled. I want to block the user input
so that users can do nothing on my console after i run
my program. What should i do?

thanks a lot, i'm a newbie.

Jimmy

i'm not sure if i fully understand your question, but try closing STDIN_FILENO and STDOUT_FILENO.

thanks! can you tell me how to close them? by a system call or other functions?

Jimmy

i tried close(STDIN_FILENO);
and close(STDOUT_FILENO);

but i can still type in the console....any other suggestions?

so u want to not even be able to type? i guess you could mess with the termios settings and disable character echoing. however, the above method, even though you can still type, the input isn't going to be read. i guess that isn't good enough though? check out 'man termios'

but if i do "close(STDIN_FILENO) ;" in my child process, then the following
"execl(...)" in the child process won't work, how to solve the problem?

let me clarify my question: in my child process generated by fork(), i'm going to do
a execl() for executing ssh to login into a remote machine. I was trying to block/disable
the user input after login into the remote machine, say the user can't input at the prompt
of the remote machine. So how can i do that?


Jimmy

you can try messing with termios like i mentioned above, but other than that i can't think of anything.

Or you can try put ' stty igncr ' in a login script, that will ignore the return or enter key

Perhaps "ssh -n"

ssh -n did work, but after i logged in by execl("...ssh",....), the format of the text on screen was in a mess, like the following:

rem@domrep:~$ VNC server supports protocol version 3.3 (viewer 3.3)
No authentica tion needed
Desktop name "nobody's x11 desktop (uml1:1)"
Connected to VNC server, using protocol version 3.3
VNC server default format:
32 bits per pixel.
Least significant byte first in each pixel.
True colour: max red 255 green 255 blue 2 55, shift red 16 green 8 blue 0
Warning: Cannot convert string "-*-helvetica-bold -r-*-*-16-*-*-*-*-*-*-*" to type FontStruct
Using default colormap which is TrueC olor. Pixel format:
16 bits per pixel.
Least significant byte first in each p ixel.
True colour: max red 31 green 63 blue 31, shift red 11 green 5 blue 0
Usin g shared memory PutImage
Same machine: preferring raw encoding
ShmCleanup called
jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~> jimmy@linux:~>
jimmy@linux:~> jimmy@linux:~>




is there anything wrong?

I can't tell, did vnc stopped prematurely ?

i closed vnc manually. is that a problem?

Well, I can't speak for you.
Are you happy with the solution, or something still bother you ?

i'm still not satisfied with the result, 'coz after i close vnc and the console itself terminate
the ssh connection, the format of the prompt and input became messy as you saw it on
my previous post. Say, when you press ENTER, the next prompt should appear on the next
line, not just a space away following the prior one.


Jimmy