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On 27.06.2012 11:16, Eric Doenges wrote: > On 26.06.2012 22:14, Yann E. MORIN wrote: > >> As Mirko suggested, I'd use a loader trick to pre-load a shared lib that >> overrides the malloc() and free() functions. Something like (untested!): >> >> void* malloc( size_t size ) >> { >> static void* real_malloc; >> >> if( ! real_malloc ) { >> real_malloc = dlsym( RTLD_NEXT, "malloc" ); >> if( ! real_malloc ) { >> panic_and_exit(); >> } >> } >> fprintf( stderr, "Allocating %d bytes\n", size ); >> return real_malloc( size ); >> } >> >> Then, replacing printf with calls to backtrace(3) and backtrace_symbols_fd(3), >> you can know the caller (function, offset), if you have the debug symbols in >> the binaries (libs and executable), in which case you can post-process that >> to find the actual file, function and line at which the call to malloc is >> made. >> >> (Note: do not use backtrace_symbols(3), as it calls malloc! So you have >> to use backtrace_symbols_fd(3)). Just a short addendum: backtrace() calls malloc() internally (see bug report from 2005 http://sourceware.org/bugzilla/show_bug.cgi?id=956), so unfortunately you can't use it in your malloc/free wrapper. -- Dr. Eric Dönges doenges@mvtec.com MVTec Software GmbH | Neherstr. 1 | 81675 München | Germany www.mvtec.com | Tel: +49 89 457695-0 | Fax: +49 89 457695-55 Geschäftsführer: Dr. Wolfgang Eckstein, Dr. Olaf Munkelt Amtsgericht München HRB 114695 -- For unsubscribe information see http://sourceware.org/lists.html#faq
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