Date: Fri, 17 Aug 2012 17:06:37 -0400 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Powerful new tool for unit tests Hi all, I'm attaching a tool I developed last night for use in unit tests, which led to the detection and fixing of the latest strtod bug. It provides a function huge_alloc which creates a huge buffer filled with a given pad byte, but for which all but the first and last few pages are shared mappings of a common backing. This makes it possible to test string functions on buffers gigabytes or even terabytes in length without the need to have that much physical storage available, and without the minutes or hours of page fault thrashing to instantiate that much memory. There are a few issues I'd still like to fix; mainly the allocation ends up being unpredictably larger than n (due mainly to laziness on my part), meaning there's no way for the caller to free the mapping. Anyway, since I may not get around to improving it right away, I'm going ahead and sharing it with the list as a potential basis for developing and performing further tests. Rich View attachment "huge.c" of type "text/plain" (1108 bytes) View attachment "test_huge_strtod.c" of type "text/plain" (253 bytes)
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.