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Once we get a glibc with 64-bit time_t, the LPSETTIMEOUT ioctl stops working, since the command number and data structure no longer match. To work around that, this introduces a new command number LPSETTIMEOUT_NEW that is used whenever the modified user space evaluates the LPSETTIMEOUT macro. The trick we use is a bit convoluted but necessary: we cannot check for any macros set by the C library in linux/lp.h, because this particular header can be included before including sys/time.h. However, we can assume that by the time that LPSETTIMEOUT is seen in the code, the definition for 'timeval' and 'time_t' has been seen as well, so we can use the sizeof() operator to determine whether we should use the old or the new definition. We use the old one not only for traditional 32-bit user space with 32-bit time_t, but also for all 64-bit architectures and x32, which always use a 64-bit time_t, the new definition will be used only for 32-bit user space with 64-bit time_t, which also requires a newer kernel. The compat_ioctl() handler now implements both commands, but has to use a special case for existing x32 binaries. The native ioctl handler now implements both command numbers on both 32-bit and 64-bit, though the latter version use the same interpretation for both. This is based on an earlier patch from Bamvor. Cc: Bamvor Jian Zhang <bamv2005@gmail.com> Link: http://www.spinics.net/lists/y2038/msg01162.html Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.