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spawning telnet from a procedure

Posted by geno976 (geno976), 29 January 2006
Hello,

I'm having trouble spawning telnet(s) from a proc.  If I spawn the telnet directly from the main program the telnet connection is made and the rest of the script works, but if I spawn from the procedure call  it fails as I never see the

Trying 172.145.1.1
Connected to 172.145.1.1
Escape character is '^]'.

Here are some code snippets..

proc login_dut { {login "admin"} {passwd ""} } {
 expect *
 send "\r"
 expect {
         "Username:" {
                 send "$login\r"
                 expect "assword:"
                 send "$passwd\r"
                 expect ">"
..
....

proc multi_telnet { ipaddr } {
 for { set i 1 } { $i <= 2 } { incr i } {
   spawn telnet $ipaddr
   login_dut
   set t($i) $spawn_id
 }
..
....

any help is greatly appreciated!

TIA!

Posted by geno976 (geno976), 29 January 2006
some more info..

if i change

Quote:
proc multi_telnet { ipaddr } {
 for { set i 1 } { $i <= 2 } { incr i } {
   spawn telnet $ipaddr
   login_dut
   set t($i) $spawn_id
 }


to

Quote:
proc multi_telnet { ipaddr } {
 for { set i 1 } { $i <= 2 } { incr i } {
   spawn telnet $ipaddr
   expect "Username:"
   ...
   ....
   set t($i) $spawn_id
 }


then it also works... i don't see why the behviour is any different.  any clues?

Thanks,

Posted by admin (Graham Ellis), 29 January 2006
Have you looked at what's in your spawn_id?  I suspect that both spawn and expect use (internally) an uplev command to access that variable in their calling code.

In the example that you've provided that was having problems, that would mean that they were different variables and so with multiple processes spawned at the same time you will indeed have problems.

Posted by geno976 (geno976), 31 January 2006
Thanks for the quick reply Graham.  You da man!

I changed

Quote:
proc multi_telnet { ipaddr } {  
 for { set i 1 } { $i <= 2 } { incr i } {  
   spawn telnet $ipaddr  
   login_dut  
   set t($i) $spawn_id  
 }  


to

Quote:
proc multi_telnet { ipaddr } {
 global spawn_id  
 for { set i 1 } { $i <= 2 } { incr i } {  
   spawn telnet $ipaddr  
   login_dut  
   set t($i) $spawn_id  
 }  


and it now works ...

Thanks again!



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