Date: Sun, 28 Aug 2011 21:12:04 -0700 From: Julian Elischer <julian@freebsd.org> To: "K. Macy" <kmacy@freebsd.org> Cc: arch@freebsd.org Subject: Re: Prefixing system calls to eliminate namespace collisions between kernel and libc Message-ID: <4E5B1194.2020600@freebsd.org> In-Reply-To: <CAHM0Q_PS-Ev48p6GffdytNTR0e5Z9nvo=JW5GL_nU==FdLjvfQ@mail.gmail.com> References: <CAHM0Q_PS-Ev48p6GffdytNTR0e5Z9nvo=JW5GL_nU==FdLjvfQ@mail.gmail.com>
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On 8/28/11 5:05 AM, K. Macy wrote:
> This change was motivated by a library that I have written which is,
> in effect, a run-time environment for running the freebsd kernel
> network stack in userspace. With the exception of a small change to
> makesyscalls.sh, this change is entirely mechanical. All
> non-compatibility kernel entry points (e.g. not linux_, freebsd32_,
> freebsd6_, etc.) are prefixed with sys_ to eliminate collisions
> between system call implementations and their libc names.
>
> NetBSD long ago made this change as well. and for linux this may
> always have been the case. Linking POSIX programs against parts of the
> kernel can actually be done just by mangling things during dynamic
> linking, so doesn't require the above, but it is certainly easier and
> more portable with the above. Ultimately I would like my userspace
> network stack to be able to run on windows as well. I don't think that
> I have the same flexibility there with regards to linker scripts.
>
> My userspace stack could ease networking code development by allowing
> initial work to take place in userspace.
>
> syscalls.master is unchanged:
> 97 AUE_SOCKET STD { int socket(int domain, int type, \
> int protocol); }
>
> Only the source function changes name:
> diff --git a/sys/kern/uipc_syscalls.c b/sys/kern/uipc_syscalls.c
> index 0e5efe6..3b83e1c 100644
> --- a/sys/kern/uipc_syscalls.c
> +++ b/sys/kern/uipc_syscalls.c
> @@ -171,7 +171,7 @@ getsock_cap(struct filedesc *fdp, int fd,
> cap_rights_t rights,
> #endif
>
> int
> -socket(td, uap)
> +sys_socket(td, uap)
> struct thread *td;
> struct socket_args /* {
> int domain;
> @@ -210,7 +210,7 @@ socket(td, uap)
>
>
>
> Please see:
>
> http://pastebin.com/PpC5uThs
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>
I see no reason to not make this change.. actually I'd be happy making
in 9.
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