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#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/mman.h>
int *g_signal_need_exit;
int saved_ppid = 0;
void signal_notify(int signum)
{
if (saved_ppid == getpid()) {
printf("parent got signal %d\n", signum);
}
*g_signal_need_exit = 1;
}
static void install_signal(void)
{
struct sigaction sa;
sa.sa_handler = signal_notify;
if (sigaction(SIGINT, &sa, NULL) == -1) {
perror("sigaction");
}
}
static void enter_eventloop(void)
{
while(!g_signal_need_exit) {
}
printf("thread exit\n");
_exit(0);
}
int main(void)
{
g_signal_need_exit = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
*g_signal_need_exit = 0;
saved_ppid = getpid();
install_signal();
for(int i = 0; i < 5; i++) {
if (fork() == 0) {
enter_eventloop();
/* raise(SIGUSR1); */
}
}
while(wait(NULL) > 0);
munmap(g_signal_need_exit, sizeof(int));
}
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