Tcl Source Code

I have created the script :
set log [open /home/rkanherk/iona_linux/demos/OrbixSSL/securebank.BMC/cxx/testcase.log w]
puts $log "Before"
set rc [catch {exec date} retval]
puts $log "rc=$rc retval=$retval"
puts $log "After"
close $log


My application calls this script and in the log i get the following signal error :


error waiting for process to exit: child process lost (is SIGCHLD ignored or trapped?)


Investigation shows that exec function in Tcl on Linux does not work .

Ah never mind, I managed to simulate the problem with just "sh":

 # sh
 $ trap "" CHLD
 $ tclsh
 % exec echo yo
 yo
 error waiting for process to exit: child process lost (is SIGCHLD ignored or trapped?)
 %

This shows that when the parent process (sh or Orbix) manipulates the sigmask so as to block SIGCHLD, bad things happen, in _any_ software that spawns children, like Tcl or any shell. So I 'd say this is a Don't Do That case. Please report the problem to Orbix.

Roma, by "calling this Tcl script using system command in
orbix application", I suspect you mean system("tclsh thescript.tcl"), right ?

If yes, then please attach the contents of the 'file' file when prepending that line with the strace command:

  system("strace -f -tt -T -o file tclsh myscript.tcl")

If this is a problem in a program that embeds the
Tcl library, make sure that program is properly
initializing Tcl.  Check for calls to Tcl_FindExecutable()
and Tcl_Init().  If you are not the author of the
failing program, report the issue to them instead/in addition
to here.

File Added - 369746: test.log

File Added - 369745: testcase.log

Hi,

I am using the 8.4 version of Tcl/Tk on Linux m/c whose details are :
Linux vm-lnx-rds18 2.6.18-128.el5 #1 SMP Wed Dec 17 11:42:39 EST 2008 i686 i686 i386 GNU/Linux

I have using Tcl in the binary format in which I got it.I did not compile it.

If you simply try to run the script I provided then you will not get the problem.But you will face the problem when u try to run it from some different application.

Like for example I am calling this Tcl script using system command in orbix application.

I have attached the testcase.log and test files.Test file contains the required trace output.

Cannot reproduce. Please give details:
   - Tcl version
   - whether you recompiled it or got it in binary form
   - compile/configure options if applicable
   - Linux distribution, kernel version
   - attach the output of:

     strace -f -tt -T -o file ./tclsh myscript.tcl