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RYXI > FreeBSD > how to add syscall with arguments through KLD 21 April 2006 08:16:58
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how to add syscall with arguments through KLD

Guhoward@Gmail.Com 21 April 2006 08:16:58
 Hi all

I wanna add syscall through KLD in FreeBSD 6.0, and have studied the
example code at /usr/share/example/­kld/.

But how could I add arguments to syscall? I tried below way, but failed
with compiler error.

syscall.c:60: warning: initialization from incompatible pointer type
*** Error code 1

Need help.

---syscall.c

#include <sys/types.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/module.h>
#include <sys/sysent.h>
#include <sys/kernel.h>
#include <sys/systm.h>

struct hello_args{
char *str;
}

/*
* The function for implementing the syscall.
*/

static int
hello (struct thread *td, struct hello_args *uap)
{
printf ("hello kernel\n");
printf ("%s\n",uap->str);
return 0;
}

/*
* The `sysent' for the new syscall
*/

static struct sysent hello_sysent = {
1, /* sy_narg */
hello /* sy_call */
};

/*
* The offset in sysent where the syscall is allocated.
*/

static int offset = NO_SYSCALL;

/*
* The function called at load/unload.
*/

static int
load (struct module *module, int cmd, void *arg)
{
int error = 0;

switch (cmd) {
case MOD_LOAD :
printf ("syscall loaded at %d\n", offset);
break;
case MOD_UNLOAD :
printf ("syscall unloaded from %d\n", offset);
break;
default :
error = EOPNOTSUPP;
break;
}
return error;
}

SYSCALL_MODULE(sysc­all, &offset, &hello_sysent, load, NULL);

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RYXI > FreeBSD > how to add syscall with arguments through KLD 21 April 2006 08:16:58
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