Date: Wed, 17 Mar 2004 21:36:39 +0300 From: Roman Bogorodskiy <bogorodskiy@inbox.ru> To: "Jacques A. Vidrine" <nectar@FreeBSD.org>, Toni Andjelkovic <toni@soth.at>, Artis Caune <ac-lists@latnet.lv>, freebsd-hackers@freebsd.org Subject: Re: kernel modules programming: struct proc question Message-ID: <20040317183639.GA635@lame.novel.ru> In-Reply-To: <20040317175340.GA88110@madman.celabo.org> References: <20040316163956.GD638@lame.novel.ru> <20040316181307.GA6576@tv.soth.at> <20040317142451.GC2506@lame.novel.ru> <opr40hacqdcpfy5d@mail.latnet.lv> <20040317154530.GD6576@tv.soth.at> <20040317175340.GA88110@madman.celabo.org>
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Jacques wrote:
> That's only correct for machines with 32-bit ints. In any case, POSIX
> only specifies that pid_t is a signed integer type... it could be any
> size supported by the implementation. For portability, you probably
> want to cast to the `biggest' type and use the appropriate printf
> specifier, e.g.
>=20
> printf("%ld", (long)pid_t);
> or
> printf("%jd", (intmax_t)pid_t); // C99
I've tried all of this ways, and I still have a wrong pid displayed...
I have no idea what I'm doing wrong.=20
Here is the full code:
module.c
>---cut 8<---
#include <sys/types.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/module.h>
#include <sys/sysent.h>
#include <sys/types.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/syscall.h>
#include <sys/ucred.h>
static int new_open(struct proc *p, register struct open_args *);
static int offset =3D NO_SYSCALL;
static int=20
new_open(struct proc *p, register struct open_args *uap)
{
char name[NAME_MAX];
size_t size;
pid_t pid;
pid =3D p->p_pid;
if((const void*)copyinstr(uap->path, name, NAME_MAX, &size) =3D=3D (const =
void*)EFAULT)
return(EFAULT);
=09
if (name[0] =3D=3D '/' && name[1] =3D=3D 't' && name[2] =3D=3D 'm' && name=
[3] =3D=3D 'p' && name[4] =3D=3D '/') {
printf("open(2): %s pid: %jd\n", name, (intmax_t)pid);//, (char *)&p->p_c=
omm);
}
=09
return (open(p, uap));
}
#define AS(name) (sizeof(struct name) / sizeof(register_t))
static struct sysent new_open_sysent =3D {
AS(open_args),
(sy_call_t *)new_open
};
static int
load (struct module *module, int cmd, void *arg)
{
int error =3D 0;
switch (cmd) {
case MOD_LOAD :
printf("syscall loaded\n");
sysent[SYS_open] =3D new_open_sysent;
break;
case MOD_UNLOAD :
printf ("syscall unloaded\n");
sysent[SYS_open].sy_call =3D (sy_call_t *)open;
break;
default :
error =3D EINVAL;
break;
=09
}
=09
return error;
}
SYSCALL_MODULE(syscall, &offset, &new_open_sysent, load, NULL);
>---cut 8<---
Makefile:
>---cut 8<---
KMOD=3D tmp_watch
SRCS=3D module.c
=2Einclude <bsd.kmod.mk>
>---cut 8<---
And uname -rm
5.2.1-RELEASE i386
-Roman Bogorodskiy
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