我有守护进程。它用作服务器套接字。为了让它听我在终端手动执行它：./daemon
现在，当我想将其保留在 ftp 服务器上时，我无法以这种方式执行。所以我希望它继续听聋。
我在 goolge 上看到了如何创建它。它说具有两个 fork() 的子进程和父进程将作为守护进程工作。但我不知道应该在哪里使用哪个进程 ID。这是我的代码，请有人指导：
using namespace std;
void *SocketHandler(void *);
int main(int argv, char **argc)
{
int host_port = 1103;
char buf[20];
int k;
struct sockaddr_in my_addr;
int hsock;
int *p_int;
int err;
socklen_t addr_size = 0;
int *csock;
sockaddr_in sadr;
pthread_t thread_id = 0;
hsock = socket(AF_INET, SOCK_STREAM, 0);
if (hsock == -1) {
printf("Error initializing socket %dn", errno);
goto FINISH;
}
p_int = (int *) malloc(sizeof(int));
*p_int = 1;
if ((setsockopt(hsock, SOL_SOCKET, SO_REUSEADDR, (char *) p_int, sizeof(int)) == -1) || (setsockopt(hsock, SOL_SOCKET, SO_KEEPALIVE, (char *) p_int, sizeof(int)) == -1)) {
printf("Error setting options %dn", errno);
free(p_int);
goto FINISH;
}
free(p_int);
my_addr.sin_family = AF_INET;
my_addr.sin_port = htons(host_port);
memset(&(my_addr.sin_zero), 0, 8);
my_addr.sin_addr.s_addr = INADDR_ANY;
if (bind(hsock, (sockaddr *) & my_addr, sizeof(my_addr)) == -1) {
fprintf(stderr, "Error binding to socket, make sure nothing else is listening on this port %dn", errno);
goto FINISH;
}
if (listen(hsock, 10) == -1) {
fprintf(stderr, "Error listening %dn", errno);
goto FINISH;
}
//Now lets do the server stuff
addr_size = sizeof(sockaddr_in);
while (true) {
printf("waiting for a connectionn\n");
csock = (int *) malloc(sizeof(int));
if ((*csock = accept(hsock, (sockaddr *) & sadr, &addr_size)) != -1) {
printf("---------------------nReceived connection from %s\n", inet_ntoa(sadr.sin_addr));
pthread_create(&thread_id, 0, &SocketHandler, (void *) csock);
pthread_detach(thread_id);
} else {
fprintf(stderr, "Error accepting %dn", errno);
}
}
FINISH:
;
}
std::pair < int, std::string > mytransform(const std::pair < std::string, int >p)
{
return std::pair < int, std::string > (p.second, p.first);
}
void *SocketHandler(void *lp)
{
int ar[10];
int result=0;
int *csock = (int *) lp;
char buf[20];
int k;
char *skp;
char *str;
char *str2;
std::stringstream ss;
std::multimap < int, std::string, std::greater < int >>dst;
std::multimap < int, std::string >::iterator rec;
std::map < std::string, int >src;
std::map < int, std::vector < std::string > >three_highest;
std::vector < std::string > writable;
std::string item;
std::ostringstream bfr;
std::string result_string;
std::istringstream iss;
std::ostringstream oss;
// std::multimap < int, std::string >::iterator it;
std::vector<std::string> most;
int max_count = 0;
int tmp=0;
int pcount = 0, ncount = 0;
char buffer[1024];
int buffer_len = 1024;
int bytecount;
int i = 0,t=0,q=0;
int j = 0;
char *ch[50] = { 0 }; /* stores references to 50 words. */
char *ch2[50] = { 0 };
char *excluded_string[50] = { 0 };
char *word = strtok(buffer, " ");
char *word2 = strtok(buffer, " ");
char *portstring1=(char *)malloc(sizeof(buffer));
char *portstring2=(char *)malloc(sizeof(buffer));
memset(buffer, 0, buffer_len);
if ((bytecount = recv(*csock, buffer, buffer_len, 0)) == -1) {
fprintf(stderr, "Error receiving data %d \n", errno);
goto FINISH;
}
printf("Received bytes %d \nReceived string %s \n ", bytecount, buffer);
word = strtok(buffer, " ");
while ((NULL != word) && (50 > i)) {
ch[i] = strdup(word);
excluded_string[j]=strdup(word);
word = strtok(NULL, " ");
skp = BoyerMoore_skip(ch[i], strlen(ch[i]) );
if(skp != NULL)
{
i++;
continue;
}
printf("exclueded : %s and %s size %d \n",excluded_string[j],ch[i],sizeof(excluded_string));
bfr << excluded_string[j] << " ";
result_string = bfr.str();
j++;
// std::cout << "string is :" << r1;
}
std::cout << "string is :" << result_string << "\n";
ss<<result_string;
while (std::getline(ss, item, ' ')) {
writable.push_back(item);
}
for (std::vector < std::string >::iterator it = writable.begin(); it != writable.end(); it++)
++src[*it];
std::transform(src.begin(), src.end(), std::inserter(dst, dst.begin()), mytransform);
rec=dst.begin();
for (auto it = dst.begin(); it != dst.end(); ++it)
std::cout << it->second << ":" << it->first << std::endl;
while (three_highest.size() < 3 && rec != dst.end()) {
three_highest[rec->first].push_back(rec->second);
rec++;
}
//std::cout << "\nthree_highest:\n";
i=0;
for (std::map < int, std::vector < std::string > >::iterator hit = three_highest.begin(); hit != three_highest.end(); ++hit) {
//std::cout << hit->first << ":";
for (std::vector < std::string >::iterator vit = (*hit).second.begin(); vit != (*hit).second.end(); vit++) {
std::cout << hit->first << ":";
std::cout << *vit << "\n";
ar[i]= hit-> first;
printf(" ar : %d \n",ar[i]);
i++;
oss << hit->first << " " << *vit << "\n";
}
}
printf( "i is :%d \n",i);
if ((bytecount = send(*csock, (char *)ar, i *sizeof(int), 0)) == -1) { // Here we cant send lenth-1. It consider exact
fprintf(stderr, "Error sending data %d\n", errno);
goto FINISH;
}
FINISH:
free(csock);
return 0;
}