* Narasimhamurthy Giridhar (giridhar@cs.clemson.edu) wrote:
>
> But user pgm does not see the new call.
> Error: at line 5,undefined reference to __NR_mycall and some other error
> regarding
> errno.
>
> The user pgm is :
>
> #include<stdio.h>
> #include<sys/time.h>
before you include unistd.h, you need to manually #define __NR_mycall 191
> #include<asm/unistd.h>
^^^
#include <linux/unistd.h> here, this ought to fix the errno problem.
> _syscall1(int, mycall, struct timeval*,t);
>
> main() {
> int ret;
> struct timeval t;
> ret = mycall(&t);
> }
>
> In /usr/src/linux/include/asm/unistd.h, i added
> #define __NR_mycall 191
are you sure you want 191, it's likely alread taken (unless your kernel
is really old)?
> In /usr/src/linux/arch/i386/kernel/entry.S, i added
>
> .long SYMBOL_NAME(sys_maycall)
make sure this is in slot 191 in the table.
cheers,
-chris
--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive: http://mail.nl.linux.org/kernelnewbies/
FAQ: http://kernelnewbies.org/faq/
