does not return an errno the usual way. The main use case is to
fix the posix_fadvise() rump stub (yes, posix_fadvise is a bit
special... bologna).
The list of NOERR syscalls currently matches the libc NOERR list
(and the libc Makefile can in the future be autogenerated from this
info).
Problem spotted by, *shocker*, the automated test runs, specifically
the posix_fadvise test.
one had the problem of bypassing the syscall layer and doing a
function call into the kernel directly. Therefore there was no
way for users of librumpclient to specify compat. The new model
pushes the compat handling in the kernel and leaves only the task
of selecting the right syscall number to the client.
This change also introduces a stable ABI for rump syscalls, i.e.
it is possible to use the same syscall client library both on NetBSD
5.0 and -current and get the syscalls resolved to the right place
depending on the ABI at the time the client binary is compiled.
A list of what to be called when will have to maintained separately
simply because this information is not available in syscalls.master
-- in the case of the normal kernel we always want to resolve a
newly linked syscall to the latest version, whereas in rump we
might want to resolve a syscall to a -current kernel to the 5.0
compat call (because our client namespace is 5.0). This information
in maintained in rump_syscalls_compat.h with the current format:
/* time_t change */
#if !__NetBSD_Prereq__(5,99,7)
#define RUMP_SYS_RENAME_STAT rump___sysimpl_stat30
....
If no compat override is given, a syscall resolves automatically
to the latest version of the syscall.
Also, this change autogenerates forward declarations for all syscall
types where it is possible (i.e. ones without typedef insanity).
This makes it possible to include rump_syscalls.h without including
rump.h.
For each syscall, add a flag for the return value or an argument indicating
that it is a 64-bit argument. Also include the number of 64-bit arguments.
In theory this could get most of the code in compat/netbsd32/netbsd32_netbsd.c
but not at the moment due to multiply defined structures.
backend, perform all calls through a syscall table. This makes it
possible to make system calls to non-local rump kernels.
(requires a bit support code. it's written but quite messy currently)
to parse and generate the compat name and basename (e.g. __stat50
and stat). Use this to autogenerate __RENAME()'s to the rump_syscalls
header so that they can be called e.g. rump_sys_socket() instead
of rump_sys___socket30().
pooka