I am trying to make some change to the source code of sqlite as I want to map a file using unixMapfile(). But I guess there will be a SIGBUS crash when one process truncate the file and do not notify other processes who want to access the file later. So I am wondering if there is any appropriate mechanism in sqlite to notify other processes? Or, in another way, is it OK to update the mmapSize of file when I catch the signal SIGBUS? As I guess I can use sigsetjmp() and siglongjmp() to restore the environment.
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