Date: Sat, 21 Dec 2002 18:52:26 +0100 From: Pawel Jakub Dawidek <nick@garage.freebsd.pl> To: Terry Lambert <tlambert2@mindspring.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Syscall number. Message-ID: <20021221175226.GP11475@garage.freebsd.pl> In-Reply-To: <3E04A8D2.C6CDBF6A@mindspring.com> References: <20021220184337.GD11475@garage.freebsd.pl> <20021221032233.GG11475@garage.freebsd.pl> <3E04A8D2.C6CDBF6A@mindspring.com>
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On Sat, Dec 21, 2002 at 09:45:54AM -0800, Terry Lambert wrote:
+> This is actually a bad way to do things.
+>=20
+> There is a system call loadable module type, and you should
+> use that instead of directly accessing the system call entry
+> table and stomping on values without asserting appropriate
+> locks.
But I want to operate on existing syscalls.
tmp =3D sysent[SYS_execve].sy_call;
sysent[SYS_execve].sy_call =3D myfunc;
int
myfunc(struct proc *p, execve_args *uap)
{
/* Do some checks, etc. */
return (tmp(p, uap));
}
--=20
Pawel Jakub Dawidek
UNIX Systems Administrator
http://garage.freebsd.pl
Am I Evil? Yes, I Am.
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