hello, i don't really understand the implications of using mmap. for example, will linux write out changes to an mmap'ed file as is or as part of a full page-write? if the latter is true, what happens if the program reads from mmap'ed pages but writes directly to the file? as far as i see it, linux will catch the writing and divert it to the mmap'ed page. this implies that only full page-writes will reach the file. i ask about this because if i want to write a transaction-safe layer for a database in a file and linux always affects more bytes in the file than the program actually commanded, there's no way, after a crash, to know about what area was actually affected and possibly crippled up. am i right or is there something i miss? how is it with common file accesses (via write or fwrite). are they paged automatically by the os too? regards, dennis heuer - To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
