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#include <signal.h>
sig_atomic_t interrupted; /* Bug: not declared volatile */
void sigint_handler(int signum) {
interrupted = 1; /* Assignment may not be visible in main(). */
}
int main(void) {
signal(SIGINT, sigint_handler);
while (!interrupted) { /* Loop may never terminate. */
/* Do something */
}
return 0;
}
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