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// This test shows that the current implementation of use-after-return is
// not signal-safe.
// RUN: %clangxx_asan -O1 %s -o %t -lpthread && %t
// RUN: %clangxx_asan -O1 %s -o %t -lpthread && %t
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/time.h>
#include <pthread.h>
int *g;
int n_signals;
typedef void (*Sigaction)(int, siginfo_t *, void *);
void SignalHandler(int, siginfo_t*, void*) {
int local;
g = &local;
n_signals++;
// printf("s: %p\n", &local);
}
static void EnableSigprof(Sigaction SignalHandler) {
struct sigaction sa;
sa.sa_sigaction = SignalHandler;
sa.sa_flags = SA_RESTART | SA_SIGINFO;
sigemptyset(&sa.sa_mask);
if (sigaction(SIGPROF, &sa, NULL) != 0) {
perror("sigaction");
abort();
}
struct itimerval timer;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = 1;
timer.it_value = timer.it_interval;
if (setitimer(ITIMER_PROF, &timer, 0) != 0) {
perror("setitimer");
abort();
}
}
void RecursiveFunction(int depth) {
if (depth == 0) return;
int local;
g = &local;
// printf("r: %p\n", &local);
// printf("[%2d] n_signals: %d\n", depth, n_signals);
RecursiveFunction(depth - 1);
RecursiveFunction(depth - 1);
}
void *Thread(void *) {
RecursiveFunction(18);
return NULL;
}
int main(int argc, char **argv) {
EnableSigprof(SignalHandler);
for (int i = 0; i < 4; i++) {
fprintf(stderr, ".");
const int kNumThread = sizeof(void*) == 8 ? 16 : 8;
pthread_t t[kNumThread];
for (int i = 0; i < kNumThread; i++)
pthread_create(&t[i], 0, Thread, 0);
for (int i = 0; i < kNumThread; i++)
pthread_join(t[i], 0);
}
fprintf(stderr, "\n");
}
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