linux 套接字添加服务器,linux套接字：服务器在客户端之前退出
我有这个编程，只是一个简单的服务器和客户端连接的框架。我会聊聊天。
(不介意线程功能和信号......)
服务器：
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define BUFFERSIZE 512
#define TIMESIZE 32
#define QUIT "!quit"
// thread pou diavazei
void *readthread(void *argp);
// katharizei ligo prin kleisei to programma
void progreset();
// kleinei to prog me ctrl-c
void sigexit();
int sock, endchat;
char username1[50];
pthread_t thrread;
int main(int argc, char** argv) {
int port, s;
char username[50];
struct sockaddr_in server, client;
struct sockaddr *serverptr, *clientptr;
unsigned int clientlen;
char buf[BUFFERSIZE];
int len;
time_t sec;
char timestr[TIMESIZE];
signal(SIGPIPE, SIG_IGN);
signal(SIGINT, sigexit);
if (argc != 3) {
printf("Error: Wrong argumentsn");
printf("Usage: %s n", argv[0]);
return -1;
}
strcpy(username, argv[1]);
port = atoi(argv[2]);
// ftiaxno to socket
if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("Failed to create socket");
return -1;
}
server.sin_family = AF_INET;
server.sin_addr.s_addr = htonl(INADDR_ANY);
server.sin_port = htons((short)port);
if (bind(s, (struct sockaddr *)&server, sizeof(server)) < 0) {
perror("Failed to bind socket");
return -1;
}
if (listen(s, 5) != 0) {
perror("Error in listen()");
return -1;
}
clientptr = (struct sockaddr *)&client;
clientlen = sizeof(client);
// perimeno sindesi apo ton pelati
printf("Accepting connections on port %d..n", port);
if ((sock = accept(s, clientptr, &clientlen)) < 0) {
perror("Error in accept()");
return -1;
}
// pairno to ip tou pelati
if (getpeername(sock, (struct sockaddr *)&client, &clientlen) < 0) {
printf("Accepted connectionn");
} else {
printf("Accepted connection from %sn", inet_ntoa(client.sin_addr));
}
// stelno kai pairno ta usernames
bzero(buf, sizeof(buf));
strcpy(buf, username);
if (write(sock, buf, sizeof(buf)) < 0) {
perror("write1");
return -1;
}
bzero(buf, sizeof(buf));
if (read(sock, buf, sizeof(buf)) < 0) {
perror("read1");
return -1;
}
strcpy(username1, buf);
printf("Chatting with %s..nn", username1);
progreset();
return 0;
}
void *readthread(void *argp) {
char buf[BUFFERSIZE];
char timestr[TIMESIZE];
int len;
time_t sec;
struct tm *timeinfo;
while (1) {
}
endchat = 1;
pthread_exit(0);
}
void progreset() {
printf("nExiting..n");
close(sock);
}
void sigexit() {
printf("testn");
close(sock);
signal(SIGINT, SIG_DFL);
kill(getpid(),SIGINT);
printf("okn");
exit(0);
}
客户
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define BUFFERSIZE 512
#define TIMESIZE 32
#define QUIT "!quit"
// thread pou diavazei
void *readthread(void *argp);
// katharizei ligo prin kleisei to programma
void progreset();
// kleinei to prog me ctrl-c
void sigexit();
int sock, endchat;
char username1[50];
pthread_t thrread;
int main(int argc, char** argv) {
int port;
char username[50];
struct sockaddr_in server, client;
struct sockaddr *serverptr, *clientptr;
unsigned int serverlen;
struct hostent *rem;
char buf[BUFFERSIZE];
int len;
time_t sec;
char timestr[TIMESIZE];
signal(SIGPIPE, SIG_IGN);
signal(SIGINT, sigexit);
if (argc != 4) {
printf("Error: Wrong argumentsn");
printf("Usage: %s n", argv[0]);
return -1;
}
strcpy(username, argv[1]);
port = atoi(argv[3]);
// ftiaxno to socket
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("Failed to create socket");
return -1;
}
rem = gethostbyname(argv[2]);
server.sin_family = AF_INET;
bcopy((char*)rem->h_addr, (char*)&server.sin_addr, rem->h_length);
server.sin_port = htons((short)port);
serverptr = (struct sockaddr *)&server;
serverlen = sizeof(server);
// kano connect me to server
if (connect(sock, serverptr, serverlen) < 0) {
perror("Failed to connect");
return -1;
}
// pairno kai stelno ta usernames
bzero(buf, sizeof(buf));
if (read(sock, buf, sizeof(buf)) < 0) {
perror("read1");
return -1;
}
strcpy(username1, buf);
bzero(buf, sizeof(buf));
strcpy(buf, username);
if (write(sock, buf, sizeof(buf)) < 0) {
perror("write1");
return -1;
}
printf("Chatting with %s..nn", username1);
sleep(1);
progreset();
return 0;
}
void *readthread(void *argp) {
char buf[BUFFERSIZE];
char timestr[TIMESIZE];
int len;
time_t sec;
struct tm *timeinfo;
while (1) {
}
endchat = 1;
pthread_exit(0);
}
void progreset() {
printf("nExiting..n");
close(sock);
}
void sigexit() {
printf("testn");
close(sock);
signal(SIGINT, SIG_DFL);
kill(getpid(),SIGINT);
printf("okn");
exit(0);
}
在main()函数中，服务器只是等待连接，然后退出。
客户端，在连接休眠1秒后，然后结束。
当我运行它时，比如./server server 1234
然后./client客户端localhost 1234
两者都正常退出，但是当我第二次运行服务器时，它说无法绑定套接字：地址已在使用中。
怎么了？
服务器必须始终在客户端之后退出吗？
奖励问：我希望每个程序有两个线程，一个用于读取，一个用于写入。它们可以在同一个插座上运行吗？
非常感谢你