diff options
| author | Jeff Dike <jdike@addtoit.com> | 2006-09-25 23:33:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-26 08:49:07 -0700 |
| commit | 4b84c69b5f6c08a540e3683f1360a6cdef2806c7 (patch) | |
| tree | 708f1e4cbc2771886aaeb8eadb3ae4d458bc8133 /arch/um/os-Linux/process.c | |
| parent | 19bdf0409f25a85a45874a5a8da6f3e4edcf4a49 (diff) | |
[PATCH] uml: Move signal handlers to arch code
Have most signals go through an arch-provided handler which recovers the
sigcontext and then calls a generic handler. This replaces the
ARCH_GET_SIGCONTEXT macro, which was somewhat fragile. On x86_64, recovering
%rdx (which holds the sigcontext pointer) must be the first thing that
happens. sig_handler duly invokes that first, but there is no guarantee that
I can see that instructions won't be reordered such that %rdx is used before
that. Having the arch provide the handler seems much more robust.
Some signals in some parts of UML require their own handlers - these places
don't call set_handler any more. They call sigaction or signal themselves.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/os-Linux/process.c')
| -rw-r--r-- | arch/um/os-Linux/process.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c index 3afde92ad2c..ff203625a4b 100644 --- a/arch/um/os-Linux/process.c +++ b/arch/um/os-Linux/process.c @@ -246,7 +246,17 @@ void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int)) set_sigstack(sig_stack, pages * page_size()); flags = SA_ONSTACK; } - if(usr1_handler) set_handler(SIGUSR1, usr1_handler, flags, -1); + if(usr1_handler){ + struct sigaction sa; + + sa.sa_handler = usr1_handler; + sigemptyset(&sa.sa_mask); + sa.sa_flags = flags; + sa.sa_restorer = NULL; + if(sigaction(SIGUSR1, &sa, NULL) < 0) + panic("init_new_thread_stack - sigaction failed - " + "errno = %d\n", errno); + } } void init_new_thread_signals(void) |