#   Possibility 1: Just set the IGNORE flag for the signal at the
#   beginning of the script.

#$SIG{'BREAK'} = 'IGNORE';
#$SIG{'INT'} = 'IGNORE';

for ($x = 0; $x < 10; $x++) {

#   Possibility 2: Set the flag to redirect towards the INT_handler
#                  function.
#   Remark: After having called the function, the flag is reset
#           to an UNDEF-like value.

#    $SIG{'BREAK'} = 'INT_handler';
#    $SIG{'INT'} = 'INT_handler';

    print("$x\n");
    sleep 1;
}

#   Possibility 1: Just set the DEFAULT flag for the signal at the
#   beginning of the script.

#$SIG{'BREAK'} = 'DEFAULT';
#$SIG{'INT'}   = 'DEFAULT';

sub INT_handler {
    print("Don't Interrupt!\n");
}

# 

# Errata below obtained through 'print %SIG;'
# concerning documentation located at 
# http://www.webbasedprogramming.com/Perl-5-By-Example/ch13.htm 
# and other locations on the web

# ABRT   This signal means that another process is trying to abort 
#        your process. 
# ALRM
# BREAK  This signal indicates that a Ctrl+Break key sequence was 
#        pressed under Windows. 
# CHLD
# CLD
# CONT
# FPE    This signal catches floating point exceptions. 
# IGNORE
# ILL    This signal indicates that an illegal instruction has been
#        attempted. 
# NUM01
# NUM05
# NUM06
# NUM07
# NUM10
# NUM12
# NUM16
# NUM17
# NUM18
# NUM19
# NUM24
# QUIT
# SEGV   This signal indicates that a segment violation has taken 
#        place. 
# STOP
# TERM   This signal means that another process is trying to terminate
#        your process. 
# __WARN__
# int    This signal indicates that a Ctrl+C key sequence was pressed 
#        under Windows. 
# kill
# pipe

# instead of

# ABRT2     This signal means that another process is trying to abort 
#           your process. 
# BREAK2    This signal indicates that a Ctrl+Break key sequence was 
#           pressed under Windows. 
# FPE2      This signal catches floating point exceptions. 
# ILL2      This signal indicates that an illegal instruction has been
#           attempted. 
# INT2      This signal indicates that a Ctrl+C key sequence was
#           pressed under Windows. 

# SEGV2     This signal indicates that a segment violation has taken
#           place. 
# TERM2     This signal means that another process is trying to
#           terminate your process.
[download]