Training, Open Source computer languages
PerlPHPPythonMySQLApache / TomcatTclRubyJavaC and C++LinuxCSS 
Search for:
Home Accessibility Courses Diary The Mouth Forum Resources Site Map About Us Contact
 
For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
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!



This page is a thread posted to the opentalk forum at www.opentalk.org.uk and archived here for reference. To jump to the archive index please follow this link.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2024: Well House Manor • 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • FAX: 01144 1225 793803 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho