Messages in this thread | | | Date | Wed, 25 Feb 2004 12:14:59 +0100 (CET) | From | Kristian Sørensen <> | Subject | Re: Implement new system call in 2.6 |
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PS. including <errno.h> in test.c doesn't solve the problem :-(
-- Kristian Sørensen <ks@cs.auc.dk>
On Wed, 25 Feb 2004, Kristian Sørensen wrote:
> Hi all! > > How do I invoke a newly created system call in the 2.6.3 kernel from > userspace? > > The call is added it arch/i386/kernel/entry.S and include/asm/unistd.h > and the call is implemented in a security module called Umbrella(*). > > The kernel compiles and boots nicely. > > The main problem is now to compile a userspace program that invokes this > call. The guide for implementing the systemcall at > http://fossil.wpi.edu/docs/howto_add_systemcall.html > has been followed, which yields the following userspace program: > > // test.h > #include "/home/snc/linux-2.6.3-umbrella/include/linux/unistd.h" > _syscall1(int, umbrella_scr, int, arg1); > > // test.c > #include "test.h" > main() { > int test = umbrella_scr(1); > printf ("%i\n", test); > } > > When compiling: > > gcc -I/home/snc/linux-2.6.3/include test.c > > /tmp/ccYYs1zB.o(.text+0x20): In function `umbrella_scr': > : undefined reference to `errno' > collect2: ld returned 1 exit status > > > It seems like a little stupid error :-( Does some of you have a solution? > > > > Thanks in advance and best regards, > Kristian Sørensen. > > > > (*) Umbrella is a security project for securing handheld devices. Umbrella > for implements a combination of process based mandatory access control > (MAC) and authentication of files. This is implemented on top of the Linux > Security Modules framework. The MAC scheme is enforced by a set of > restrictions for each process. > More information on http://umbrella.sf.net > > > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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