what does get_fs and set_fs do... i searched for its documnetation and cud not get something considerable information... can u pls point me to some book or link which explains the basics of these 2 functions... thanks, raghu On Fri, 8 Nov 2002, Mohit Kalra wrote: > > Your module is a part of the kernel. Your system call always takes a user > space string. when you supply a kernel space string your sys call will > reject it. > > try using > > fs = get_fs(); // fs is of type mm_segment_t > set_fs(get_ds()) > > /* your code here*/ > > set_fs(fs); > > > That is, let the sys call consider the kernel space to be a valid source of > input. Also look at filp_open if you really want to open a file in kernel > space. > > Regards, > Mohit Kalra > > "It is a capital mistake to theorize before one has data. > Insensibly one begins to twist facts to suit theories, instead of theories > to suit facts." > > > > > I am not using the systemcall open(). I am using the sys_open(). > > I create a function pointer of the type sys_open say my_open > > and do > > my_open = syscall[__NR_OPEN]; > > and then use it to open the file... > > But when i do this, i am getting an errno of -14 > which is I suppose illegal operation. So what more do i need to open the > file from my module. > > > > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
