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#include <csignal>
 
static void sig_handler(int sig) {
  // Implementation details elided.
}

void finstall_signal_handler() {
  if (SIG_ERR == std::signal(SIGTERM, sig_handler)) {
    // Handle error
  }
}

#include <csignal>
 
extern "C" void sig_handler(int sig) {
  // Implementation details elided.
}

void finstall_signal_handler() {
  if (SIG_ERR == std::signal(SIGTERM, sig_handler)) {
    // Handle error
  }
}