Given this piece of code: 
$sub = sub { exec "perl $0" };
$SIG{INT} = $sub;
$SIG{USR1} = $sub;

print ++$counter while 1;

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Each signal handler works, but only once. After that type of signal has been delivered, that signal ceases to have an effect. Why is this so? Edit: My test code was basically the same as sh1tn's, and I get this output, from perl v5.8.1-RC3, running under OS X 10.3.8: 
[matt@powerbook test] perl 440900.pl 
1
2
3
4
^C1
2
3
4
^C5
^C^C6
^C^C7
^C8
^Z
[1]+  Stopped                 perl 440900.pl

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In reply to Can't catch signals after an exec? by mattk

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