allow_user_segv.cc [plain text]
#include <signal.h>
#include <stdio.h>
struct sigaction user_sigaction;
struct sigaction original_sigaction;
void User_OnSIGSEGV(int signum, siginfo_t *siginfo, void *context) {
fprintf(stderr, "User sigaction called\n");
if (original_sigaction.sa_flags | SA_SIGINFO)
original_sigaction.sa_sigaction(signum, siginfo, context);
else
original_sigaction.sa_handler(signum);
}
int DoSEGV() {
volatile int *x = 0;
return *x;
}
int main() {
user_sigaction.sa_sigaction = User_OnSIGSEGV;
user_sigaction.sa_flags = SA_SIGINFO;
#if defined(__APPLE__) && !defined(__LP64__)
int signum = SIGBUS;
#else
int signum = SIGSEGV;
#endif
if (sigaction(signum, &user_sigaction, &original_sigaction)) {
perror("sigaction");
return 1;
}
fprintf(stderr, "User sigaction installed\n");
return DoSEGV();
}