我正在尝试实现一个 tcp 客户端和 tcp 服务器。我能够建立连接，但是当我从客户端发送消息时，服务器没有收到它，是的，我确实看过以前的帖子，并且有很多类似的问题。我确实关注了他们，但我仍然遇到同样的错误。我得到的错误来自服务器端：
recv: Socket operation on non-socket
这是我的代码。如果您能告诉我我做错了什么，我将不胜感激。我认为我的服务器实现存在问题。
服务器：
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT 3490
#define BACKLOG 10
int main()
{
struct sockaddr_in server;
struct sockaddr_in dest;
int status,socket_fd, client_fd,num;
socklen_t size;
char buffer[10240];
memset(buffer,0,sizeof(buffer));
int yes = 1;
if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0))== -1) {
fprintf(stderr, "Socket failure!!\n");
exit(1);
}
if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) == -1) {
perror("setsockopt");
exit(1);
}
memset(&server, 0, sizeof(server));
memset(&dest,0,sizeof(dest));
server.sin_family = AF_INET;
server.sin_port = htons(PORT);
server.sin_addr.s_addr = INADDR_ANY;
if ((bind(socket_fd, (struct sockaddr *)&server, sizeof(struct sockaddr )))== -1) { //sizeof(struct sockaddr)
fprintf(stderr, "Binding Failure\n");
exit(1);
}
if ((listen(socket_fd, BACKLOG))== -1){
fprintf(stderr, "Listening Failure\n");
exit(1);
}
while(1) {
size = sizeof(struct sockaddr_in);
if ((client_fd = accept(socket_fd, (struct sockaddr *)&dest, &size)==-1)) {
//fprintf(stderr,"Accept Failure\n");
perror("accept");
exit(1);
}
printf("Server got connection from client %s\n", inet_ntoa(dest.sin_addr));
//buffer = "Hello World!! I am networking!!\n";
if ((num = recv(client_fd, buffer, 10239,0))== -1) {
//fprintf(stderr,"Error in receiving message!!\n");
perror("recv");
exit(1);
}
// num = recv(client_fd, buffer, sizeof(buffer),0);
buffer[num] = '\0';
printf("Message received: %s\n", buffer);
close(client_fd);
return 0;
//close(socket_fd);
}
}
客户：
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT 3490
int main(int argc, char *argv[])
{
struct sockaddr_in server_info;
struct hostent *he;
int socket_fd,num;
char *buffer;
if (argc != 2) {
fprintf(stderr, "Usage: client hostname\n");
exit(1);
}
if ((he = gethostbyname(argv[1]))==NULL) {
fprintf(stderr, "Cannot get host name\n");
exit(1);
}
if ((socket_fd = socket(AF_INET, SOCK_STREAM, 0))== -1) {
fprintf(stderr, "Socket Failure!!\n");
exit(1);
}
memset(&server_info, 0, sizeof(server_info));
server_info.sin_family = AF_INET;
server_info.sin_port = htons(PORT);
server_info.sin_addr = *((struct in_addr *)he->h_addr);
if (connect(socket_fd, (struct sockaddr *)&server_info, sizeof(struct sockaddr))<0) {
//fprintf(stderr, "Connection Failure\n");
perror("connect");
exit(1);
}
buffer = "Hello World!! I am networking!!\n";
if ((send(socket_fd,buffer, sizeof(buffer),0))== -1) {
fprintf(stderr, "Failure Sending Message\n");
close(socket_fd);
exit(1);
}
else {
printf("Message being sent: %s\n",buffer);
}
close(socket_fd);
}