diff options
Diffstat (limited to 'arch/um/os-Linux/signal.c')
| -rw-r--r-- | arch/um/os-Linux/signal.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index 420ee86d0d1..18e5c8b67eb 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -117,6 +117,46 @@ void remove_sigstack(void) void (*handlers[_NSIG])(int sig, struct sigcontext *sc); +void handle_signal(int sig, struct sigcontext *sc) +{ + unsigned long pending = 0; + + do { + int nested, bail; + + /* + * pending comes back with one bit set for each + * interrupt that arrived while setting up the stack, + * plus a bit for this interrupt, plus the zero bit is + * set if this is a nested interrupt. + * If bail is true, then we interrupted another + * handler setting up the stack. In this case, we + * have to return, and the upper handler will deal + * with this interrupt. + */ + bail = to_irq_stack(sig, &pending); + if(bail) + return; + + nested = pending & 1; + pending &= ~1; + + while((sig = ffs(pending)) != 0){ + sig--; + pending &= ~(1 << sig); + (*handlers[sig])(sig, sc); + } + + /* Again, pending comes back with a mask of signals + * that arrived while tearing down the stack. If this + * is non-zero, we just go back, set up the stack + * again, and handle the new interrupts. + */ + if(!nested) + pending = from_irq_stack(nested); + } while(pending); +} + extern void hard_handler(int sig); void set_handler(int sig, void (*handler)(int), int flags, ...) |