https://stackoverflow.com/questions/57774122/jvm-terminates-when-receiving-posix-signal

sighandle.c

// Compile:
//     gcc -shared -fPIC -olibsighandle.so sighandle.c
//
// Run:
//     java -agentpath:/path/to/libsighandle.so ...
//     kill -37 <pid>

#include <signal.h>
#include <stdlib.h>
#include <unistd.h>

static void handler(int sig) {
    static char message[] = "Signal handler called\n";
    write(1, message, sizeof(message) - 1);
}

__attribute__((visibility("default")))
int Agent_OnLoad(void* vm, char* options, void* reserved) {
    int sig = options != NULL ? atoi(options) : SIGRTMIN + 3;
    signal(sig, handler);
    return 0;
}