}
/**
- * Install signal handler for SIGSEGV. Check that nobody has already installed its own handler.
- * Historically, the Java VM did that but this could maybe removed now that Java is gone (TODO)
+ * Install signal handler for SIGSEGV.
*/
static void install_segvhandler()
{
- stack_t old_stack;
-
- if (simgrid::kernel::context::Context::install_sigsegv_stack(&old_stack, true) == -1) {
+ if (simgrid::kernel::context::Context::install_sigsegv_stack(nullptr, true) == -1) {
XBT_WARN("Failed to register alternate signal stack: %s", strerror(errno));
return;
}
- if (not(old_stack.ss_flags & SS_DISABLE)) {
- XBT_DEBUG("An alternate stack was already installed (sp=%p, size=%zu, flags=%x). Restore it.", old_stack.ss_sp,
- old_stack.ss_size, (unsigned)old_stack.ss_flags);
- sigaltstack(&old_stack, nullptr);
- }
struct sigaction action;
- struct sigaction old_action;
action.sa_sigaction = &segvhandler;
action.sa_flags = SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
sigemptyset(&action.sa_mask);
/* Linux tend to raise only SIGSEGV where other systems also raise SIGBUS on severe error */
for (int sig : {SIGSEGV, SIGBUS}) {
- if (sigaction(sig, &action, &old_action) == -1) {
+ if (sigaction(sig, &action, nullptr) == -1)
XBT_WARN("Failed to register signal handler for signal %d: %s", sig, strerror(errno));
- continue;
- }
- if ((old_action.sa_flags & SA_SIGINFO) || old_action.sa_handler != SIG_DFL) {
- XBT_DEBUG("A signal handler was already installed for signal %d (%p). Restore it.", sig,
- (old_action.sa_flags & SA_SIGINFO) ? (void*)old_action.sa_sigaction : (void*)old_action.sa_handler);
- sigaction(sig, &old_action, nullptr);
- }
}
}