Visit Our UNIX and Linux User Community


Thread Tools Search this Thread
Top Forums Shell Programming and Scripting tcl/expect
# 1  
Old 03-25-2008
Java tcl/expect

Can someone identify what is the problem here?.

no children
while executing
"exp_wait -nowait -i -1"
(procedure "logOptions" line 45)
invoked from within
(procedure "doExecute" line 98)
invoked from within
(procedure "main" line 32)
invoked from within
"main $argc $argv"
# 2  
Old 03-25-2008
It's kinda hard to identify without seeing the whole script. What actions have you done prior to the error, how does the error appears, what is the command line invoked, what is the OS in question ?
# 3  
Old 03-25-2008
Little background:

This is a expect-tk script which we have it on a Sun-sparc WS. The script was working fine before we upgraded the machine from solaris 9.0 to solaris 10.0. Now the script does not execute properly, as seen in the error message it does not identify the child process and above procedures fail
    (procedure "logOptions" line 45)
invoked from within
    (procedure "doExecute" line 98)
      (procedure "main" line 32)
   "main $argc $argv"

When I try to execute "exp_wait -nowait -i -1" through catch it seems to be working fine.

If you need any other information please let me know.

Last edited by Yogesh Sawant; 04-18-2008 at 06:14 AM.. Reason: added code tags
# 4  
Old 03-25-2008
Tcl version btwn 9 & 10? Are you using an expect binary or loading as a package?
The error message is pretty benevolent in theory. It's the same call as:


If the child hasn't exited by the time you check for exit then this is the
message you will get. There is also the possibilty that you are simply calling
exec instead of fork and exec in which case behavior is random after the first
wait iirc.

Have you considered asynchronously handling SIGCHLD via trap as an experiment?
# 5  
Old 03-25-2008
Tcl version btwn 9 & 10? -- No the solaris version 9 and 10.
Are you using an expect binary or loading as a package? -- it is a binary. (expect1.1)
Have you considered asynchronously handling SIGCHLD via trap as an experiment? -- how do I do that?.
# 6  
Old 03-25-2008
Yes, sorry. I meant what are the expect revisions between sol9 and sol10? Are they identical? More importantly are the tcl/tk installations of the same version between
solaris 9 and 10?

If using a mismatched expect binary with different versions of tcl/tk installed behaviors like this are common. OTOH, it could be a bug in the newer version of expect.

As for how to async handle signals you just install a handler.
proc waitonchld {} {
     set ret [exp_wait -nowait -i -1]
     puts "Handled child exit $ret"
trap -code waitonchld {SIGCHLD}

# 7  
Old 03-25-2008
Would it right anything?. I mean a "0" or "1"?. Sorry just want to know beforehand what to expect.

Previous Thread | Next Thread
Test Your Knowledge in Computers #837
Difficulty: Medium
SOAP was designed as an object-addressing protocol in 1998,
True or False?

10 More Discussions You Might Find Interesting

1. Red Hat

Issue in installing expect and Tcl

Hi I need to install expect in redhat. through net I came to know that I must install tcl too in order to make expect work. I have downloaded both packages but not able to install # ls -lrt total 3720 18:33 tcl8.4.20-src.tar.gz 18:33 expect5.45.3.tar.gz 18:40 expect5.45.3... (7 Replies)
Discussion started by: scriptor
7 Replies

2. Shell Programming and Scripting

Convert my shell script into expect/tcl

hi experts, how will i convert the first part of my script into expect or tcl since shell script cannot be embedded into expect script ? i have 100+ servers in my serverlist. how will i call or declare it in expect or tcl ? #!/usr/sbin/expect -f serverlist=`cat $1` for i in serverlist... (2 Replies)
Discussion started by: linuxgeek
2 Replies

3. Shell Programming and Scripting

expect TCL script

Hello, I write a TCL script for Expect/ Telnet. I want to send command to the telnet server. But I want to close after the command is sent. Anybody know which command can flush the expect so I can sure the command is sent to the telnet server??? EX: send "./command1\r" close... (0 Replies)
Discussion started by: linboco
0 Replies

4. UNIX for Dummies Questions & Answers

Expect/Tcl help

hi, I am new in Expect. I have a question about expect timeout. suppose I have a structure of expect { ".."{ send"............"} timeout{ ............... } } The silly question is if I reach timeout, how can I store the error message showing on the screen to... (2 Replies)
Discussion started by: allenxiao7
2 Replies

5. Shell Programming and Scripting

TCL/Expect not working as expected

I am having an issue with TCL\Expect; I am passing arguments via the commandline that are read in via "lrange $argv". One of those var's is a password with characters that need to be escapaed, after escaping them an hitting enter expect is placing curly braces around my password... why?! ... (4 Replies)
Discussion started by: RiSk
4 Replies

6. Shell Programming and Scripting

Help with TCL/Expect in Solaris 5.3

I'm having this problem with a very simple tcl expect script that is running on Solaris 5.3 with TCL version 8.4.7 and expect version 5.0. below is the simplified version of the code snippet, which I think has everything to illustrate the problem, the full version is at the very bottom in... (0 Replies)
Discussion started by: pinchharmonic
0 Replies

7. Shell Programming and Scripting

Tcl expect HELP

In the following "for" loop I assume the the script will expect "anyway", "first" NOT in any paticular order and send "yes" when there found, breaking out of the loop when "$prompt" is found. The way it is working is like 3 individual expect lines, and they MUST be in cronological order. ANY help... (0 Replies)
Discussion started by: dave_m
0 Replies

8. UNIX for Dummies Questions & Answers

Expect/Tcl help?

Does anyone know of an expect/tcl forum that is as helpful as this one is for shell scripting? Or if anyone has any expect knowledge, can you please provide some guidance on how to write to a local error log based on output from a ssh session? I have something like this: foreach host... (2 Replies)
Discussion started by: earnstaf
2 Replies

9. Shell Programming and Scripting

Expect with tcl/tk

hai all, i have an tcl script in which i have been reading the DUT Command prompt of an cisco switch as DUT Command Prompt : cisco* and running the test case of stp now the problem is if i have given any blank space in between the cisco or at the startup then the Expect is not identifying the... (0 Replies)
Discussion started by: sanjustudy
0 Replies

10. Shell Programming and Scripting

TCL/Expect project questions

I am rewriting the first big script project I ever coded to clean up some issues, mainly my really clumsy bash code, and to migrate to TCL/Expect. I have a couple of questions that I could use some help with. 1.) The script needs to know where it is located. I realize that I could use "find /... (1 Reply)
Discussion started by: thumper
1 Replies

Featured Tech Videos