#if defined(__ANDROID__)
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#include <signal.h>
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#define SIGMAX 64
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static void (*wrapped_signal_handlers[SIGMAX]) (int, siginfo_t *, void *);
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static void signal_handler(int signum, siginfo_t* siginfo, void* sigcontext)
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{
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if (wrapped_signal_handlers[signum])
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wrapped_signal_handlers[signum](signum, siginfo, sigcontext);
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}
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extern int __real_sigaction(int signum, const struct sigaction *action, struct sigaction *old_action);
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__attribute__((used)) int __wrap_sigaction(int signum, const struct sigaction *action, struct sigaction *old_action)
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{
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struct sigaction wrapper_action_data;
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struct sigaction* wrapper_action = NULL;
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if (signum >= SIGMAX)
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return __real_sigaction(signum, action, old_action);
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// patch sig action with our thumb compiled dispatcher
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if (action)
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{
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wrapper_action = &wrapper_action_data;
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memcpy(wrapper_action, action, sizeof(*action));
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wrapper_action->sa_sigaction = signal_handler;
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}
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// install handler (abort on error)
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if (__real_sigaction(signum, wrapper_action, old_action) == -1)
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return -1;
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// hide any previously installed wrapper
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if (old_action && old_action->sa_sigaction == signal_handler)
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old_action->sa_sigaction = wrapped_signal_handlers[signum];
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// add action to dispatch table
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if (action)
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wrapped_signal_handlers[signum] = action->sa_sigaction;
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return 0;
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}
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#undef SIGMAX
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#endif /* __ANDROID__ */
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