How to include "EXCEPTION" handling block in PL/TCL function.

Hi,

How to include “EXCEPTION” handling block in PL/TCL function.

I have attached below an e-mail program written in PL/TCL function.

I want to log messages into a table from a function “log_error” written in 'plpgsql' whenever any exception occurs (like unable to connect/invalid email etc.)

Pls update the code attached below.

Thanks

Dinesh Pandey

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CREATE OR REPLACE FUNCTION PGMAIL(text, text, text, text, text, text) RETURNS INT4 AS '

          set mailfrom   $1

          set mailto      $2

          set mailcc      $3

          set mailserver          $4

          set mailsubject $5

          set mailmessage $6

# Mail Server 

          set myHost $mailserver

# Mail Server SMTP Port     

          set myPort 25

          set mySock [socket $myHost $myPort]

# Mail To Address

          set toemailaddress_start [string first "<" $mailto]

          if {$toemailaddress_start != -1} {

                   set toemailaddress_finish [string first ">" $mailto]

                   set toemailaddress_start [expr $toemailaddress_start + 1]

                   set toemailaddress_finish [expr $toemailaddress_finish - 1]

                   set toemailaddress [string range $mailto $toemailaddress_start $toemailaddress_finish]

          } else {

                   set toemailaddress $mailto

          }

# Mail Cc Address

          set ccemailaddress_start [string first "<" $mailcc]

          if {$ccemailaddress_start != -1} {

                   set ccemailaddress_finish [string first ">" $mailcc]

                   set ccemailaddress_start [expr $ccemailaddress_start + 1]

                   set ccemailaddress_finish [expr $ccemailaddress_finish - 1]

                   set ccemailaddress [string range $mailcc $toemailaddress_start $ccemailaddress_finish]

          } else {

                   set ccemailaddress $mailcc

          }

# Mail From Address 

          set fromemailaddress_start [string first "<" $mailfrom]

          if {$fromemailaddress_start != -1} {

                   set fromemailaddress_finish [string first ">" $mailfrom]

                   set fromemailaddress_start [expr $fromemailaddress_start + 1]

                   set fromemailaddress_finish [expr $fromemailaddress_finish - 1]

                   set fromemailaddress [string range $mailfrom $fromemailaddress_start $fromemailaddress_finish]

          } else {

                   set fromemailaddress $mailfrom

          }

          fileevent $mySock writable [list svcHandler $mySock]

                   fconfigure $mySock -buffering none

                   puts $mySock "helo $mailserver"

                   gets $mySock name

                   puts $mySock "mail from: $fromemailaddress"

                   gets $mySock name

                   puts $mySock "rcpt to: $toemailaddress"

                   gets $mySock name

                   puts $mySock "rcpt cc: $ccemailaddress"

                   gets $mySock name

                   puts $mySock "data"

                   gets $mySock name

                   puts $mySock "To: $mailto"

                   puts $mySock "Cc: $mailcc"

                   puts $mySock "From: $mailfrom"

                   puts $mySock "Subject: $mailsubject"

                   puts $mySock ""

                   puts $mySock "$mailmessage"

                   puts $mySock "."

                   gets $mySock name

          close $mySock

          return 1'

################################

#Exception handling block here

#sp_exec log_error(………);

LANGUAGE 'pltclu';

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