Benchmark crashing very often

[Jzhyang1]

On all benchmarks included, there are relatively frequent/inconsistent issues with running s3fifo, fifo, mglru, and sampling (when they are used; baseline and LFU run most of the time without issue)

[ccfeiker]

This is because the policy's keep-alive mechanism has a problem. The eBPF .c program uses getchar() to keep the .c program alive and prevent it from exiting. However, during benchmark testing, running the eBPF program with a script may cause the .c program to receive characters. After getchar() returns, the eBPF resources are released, and then the program crashes.

You can set the keep-alive mode of getchar() to signal handling.

static volatile sig_atomic_t exiting;

static void sig_handler(int signo) {
exiting = 1;
}

printf("Policy attached. Press Ctrl-C to exit...\n");
while (!exiting)
pause();