void handle_sigchld(int sig)
{
pid_t pid;
unsigned int *value;
uint32_t *ip;
while ((pid = waitpid(-1, NULL, WNOHANG)) > 0) {
--num_of_clients;
ip = hash_lookup_value_by_key(pid_to_ip, &pid, sizeof(pid));
hash_free_entry(pid_to_ip, &pid, sizeof(pid));
value = hash_lookup_value_by_key(ip_to_clients, &ip, sizeof(ip));
*value = *value - 1;
if (*value == 0)
hash_free_entry(ip_to_clients, &ip, sizeof(ip));
}
}
static void handle_sigchld(int sig)
{
pid_t pid;
while((pid = waitpid(-1, NULL, WNOHANG)) > 0)
{
--num_of_clients;
//pid -> ip
uint32_t *p_ip = hash_lookup_value_by_key(pid_to_ip, &pid, sizeof(pid));
assert(p_ip != NULL); //ip必须能找到
uint32_t ip = *p_ip;
//ip -> clients
unsigned int *p_value = (unsigned int *)hash_lookup_value_by_key(ip_to_clients, &ip, sizeof(ip));
assert(p_value != NULL && *p_value > 0);
--*p_value;
//释放hash表的结点
hash_free_entry(pid_to_ip, &pid, sizeof(pid));
}
}
unsigned int add_ip_to_hash(hash_t *hash, uint32_t ip)
{
unsigned int *p_value = (unsigned int*)hash_lookup_value_by_key(hash,&ip,sizeof(ip));
if (p_value == NULL) {
unsigned int value = 1;
hash_add_entry(hash, &ip, sizeof(ip), &value, sizeof(value));
return 1;
} else {
unsigned int value = *p_value;
value++;
*p_value = value;
return value;
}
}
