Hi,
In the last days I've exchanged some e-mails with PCRE's author because of
one more bug that appeared in our database about segfaults in PCRE (related
to stack overflows).
PCRE can consume a lot of stack, because of backtracking (thus segfaulting
PHP). Yesterday I've discovered that when using the setrlimit() function,
most segfaults can be avoided
(http://mega.ist.utl.pt/~ncpl/php_pcre_stack_limits.txt) :)
But I was thinking why we can't fail more silently from segfaults. A
recursive PHP function can easily segfault PHP. Why can't we catch the
signal and recover from the error? (and print a "stack overflow" message,
like java does).
I've done a little program for fun to show myself how to catch the SIGSEGV
signals and print a nice message.
(http://mega.ist.utl.pt/~ncpl/break-stack.html)
So, catching the signal is easy. What about recovery? Doesn't anyone has
experience in this area? Can this be done? (and in most
SAPIs/architectures?)
Nuno
P.S.: sorry if my "bright" idea is dumb and/or undoable :)
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