我有两个过程:daemon
和client
. 两者都是不同的插座。./daemon
最初我通过然后执行守护程序套接字
./client
。
但我希望守护进程应该始终在后台监听来自客户端的请求。所以使用fork()
我试图创建这样一个过程。
我刚刚编辑了原始代码。
现在,当我可以编译守护程序文件并创建可执行文件时daemon
。
但是当我发送请求./client
时它没有响应。并说error connecting socket 111
。
daemon
正在侦听1104
和客户端发送请求相同。当我执行./daemon
它说
Error binding to socket, make sure nothing else is listening on this port 22n
意味着它在后台运行,但不响应请求。代码:
#include <fcntl.h>
#include <string.h>
#include <algorithm>
#include "dictionary_exclude.h"
#pragma GCC diagnostic ignored "-Wwrite-strings"
#define CHECK_THROW(condition, code) if(condition) throw code
void *SocketHandler(void *);
int OpenSocket();
int main(int argv, char **argc)
{
int host_port = 1104;
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;
try {
pid_t pid = fork();
CHECK_THROW(pid < 0, -5);
if (pid == 0) {
mode_t umask(mode_t mask);
pid_t childid = setsid();
hsock = OpenSocket(); // Function call for hsock
CHECK_THROW(listen(hsock, 10) == -1, -4);
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);
exit(EXIT_SUCCESS);
}
if (listen(hsock, 10) == -1) {
fprintf(stderr, "Error listening %dn", errno);
exit(EXIT_SUCCESS);
}
//Now lets do the server stuff
addr_size = sizeof(sockaddr_in);
while (true) {
printf("waiting for a connectionnn");
csock = (int *) malloc(sizeof(int));
if ((*csock = accept(hsock, (sockaddr *) & sadr, &addr_size)) != -1) {
printf("---------------------nReceived connection from %sn", inet_ntoa(sadr.sin_addr));
pthread_create(&thread_id, 0, &SocketHandler, (void *) csock);
pthread_detach(thread_id);
} else {
fprintf(stderr, "Error accepting %dn", errno);
}
} //while end
} //if (pid) end
} //try
catch(int ierror) {
switch (ierror) {
case -4:
fprintf(stderr, "Error listening %dn", errno);
break;
case -7:
fprintf(stderr, "Error accepting %dn", errno);
break;
}
}
}
int OpenSocket()
{
// Create your socket and return the socket handle from this function
int hsock;
int *p_int;
hsock = socket(AF_INET, SOCK_STREAM, 0);
if (hsock == -1) {
printf("Error initializing socket %dn", errno);
exit(EXIT_SUCCESS);
}
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);
exit(EXIT_SUCCESS);
}
free(p_int);
return hsock;
}
void *SocketHandler(void *lp)
{
//some procesing
}
有人可以说上面的代码有什么问题吗?
原始代码是:
int main(int argv, char **argc)
{
int host_port = 1104;
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;
try {
pid_t pid = fork();
CHECK_THROW(pid < 0, -5);
if (pid == 0) {
mode_t umask(mode_t mask);
pid_t childid = setsid();
hsock = OpenSocket(); // Function call for hsock
CHECK_THROW(listen(hsock, 10) == -1, -4);
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);
exit(EXIT_SUCCESS);
}
if (listen(hsock, 10) == -1) {
fprintf(stderr, "Error listening %dn", errno);
exit(EXIT_SUCCESS);
}
//Now lets do the server stuff
addr_size = sizeof(sockaddr_in);
while (true) {
printf("waiting for a connectionnn");
csock = (int *) malloc(sizeof(int));
if ((*csock = accept(hsock, (sockaddr *) & sadr, &addr_size)) != -1) {
printf("---------------------nReceived connection from %sn", inet_ntoa(sadr.sin_addr));
pthread_create(&thread_id, 0, &SocketHandler, (void *) csock);
pthread_detach(thread_id);
} else {
fprintf(stderr, "Error accepting %dn", errno);
}
} //while end
} //if (pid) end
} //try
catch(int ierror) {
switch (ierror) {
case -4:
fprintf(stderr, "Error listening %dn", errno);
break;
case -7:
fprintf(stderr, "Error accepting %dn", errno);
break;
}
}
}
int OpenSocket()
{
// Create your socket and return the socket handle from this function
int hsock;
int *p_int;
hsock = socket(AF_INET, SOCK_STREAM, 0);
if (hsock == -1) {
printf("Error initializing socket %dn", errno);
exit(EXIT_SUCCESS);
}
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);
exit(EXIT_SUCCESS);
}
free(p_int);
return hsock;
}
void *SocketHandler(void *lp)
{
//some procesing
}