On Thu, Jan 17, 2002 at 03:36:53PM -0500, Michael Zhu wrote: > In losetup: > The sizeof(struct loop_info) is 148. > The sizeof(dev_t) is 8. > > In loop: > The sizeof(struct loop_info) is 136. > The sizeof(dev_t) is 2. Unfortunately dev_t is rather OS-specific, and, therefore, it is a bit harder to have it defined to the proper type. In util-linux 2.11 a shell script (attached) is used. It will output a loop.h file which will have dev_t defined to the correct type. Hope this helps, -- Pav
#!/bin/sh # # Figure out (i) the type of dev_t (ii) the defines for loop stuff # rm -f loop.h # Since 1.3.79 there is an include file <asm/posix_types.h> # that defines __kernel_dev_t. # (The file itself appeared in 1.3.78, but there it defined __dev_t.) # If it exists, we use it, or, rather, <linux/posix_types.h> which # avoids namespace pollution. Otherwise we guess that __kernel_dev_t # is an unsigned short (which is true on i386, but false on alpha). if [ -f /usr/include/linux/posix_types.h ]; then echo '#include <linux/posix_types.h>' >> loop.h echo '#undef dev_t' >> loop.h echo '#define dev_t __kernel_dev_t' >> loop.h else echo '#undef dev_t' >> loop.h echo '#define dev_t unsigned short' >> loop.h fi # Next we have to find the loop stuff itself. # First try kernel source, then a private version. if [ -f /usr/include/linux/loop.h ]; then echo '#include <linux/loop.h>' >> loop.h else echo '#include "h/loop.h"' >> loop.h fi echo '#undef dev_t' >> loop.h
