Date: Sun, 28 Aug 2011 14:05:16 +0200 From: "K. Macy" <kmacy@freebsd.org> To: arch@freebsd.org Subject: Prefixing system calls to eliminate namespace collisions between kernel and libc Message-ID: <CAHM0Q_PS-Ev48p6GffdytNTR0e5Z9nvo=JW5GL_nU==FdLjvfQ@mail.gmail.com>
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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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