本程序实现的是一个能返回hello world的http server, 也只能返回hello world，作为C语言http server开发的一个起步阶段。
/*
编译生成可执行程序（Ubuntu Linux 24.04）
# gcc ./socket_server.c -o socket_server
# scp socket_server root@idealand.space:/root/code/buda/c
启动http server
# ./socket_server http_single_thread
启动client message display
# ./socket_server show_client_messages查看防火墙的状态：(国内的云服务器80,443,8080,8443是备案端口，必须备案以后才能从外网访问，注意避免使用)
# ufw status
# ufw allow 8888
查看端口是否被其它程序占用
# sudo apt lsof
# lsof -i:8888
*/#include <stdio.h> // printf
#include <string.h> // strlen(char*)
#include <unistd.h> // close(int file_descriptor): close socket
#include <sys/socket.h> // socket(), bind(), accept(), etc
#include <netdb.h> // gethostbyname(char* domain_name)
#include <arpa/inet.h> // long inet_addr(char* ip_address) : convert ip string to long int format#define SERVER_LISTEN_PORT 8888
#define SOCK_BUF_SIZE 10241
#define SOCK_BUF_SIZE1 10240 // subtract 1 for the null terminator at the buf end
#define SOCK_CONN_QUEUE_MAX 3
#define MODE_show_client_messages "show_client_messages"
#define MODE_http_single_thread "http_single_thread"
#define HTTP_HEAD "HTTP/1.1 200 OK\n\
Server: buda\n\
Content-Type: text/html\n\
Content-Length: %ld\n\
\n\
%s"enum MODE
{SHOW_CLIENT_MESSAGES=1, HTTP_SINGLE_THREAD
};typedef int (*FUN_process_connection_sock)(int sock, char* buffer, int buf_size); int make_http_response(char* buf, int buf_size)
{char* content="<!DOCTYPE html><body>hello world</body></html>";int len=sprintf(buf, HTTP_HEAD, strlen(content) , content); buf[len]=0;return len;
}// server waits for messages from client, and display messages in server console
// the listen socket and connection sockets work in the same single thread, so the queued clients may be blocked for a very long time.
int show_client_messages_single_thread(int sock, char* buffer, int buf_size)
{long recv_size=0, buf_size1=buf_size-1;while((recv_size = recv(sock, buffer, buf_size1, 0))>0){if(recv_size<0) { printf("receive from client failed\n"); return -1;}buffer[recv_size]=0; // set string endprintf("received %ld bytes data: \n%s\n", recv_size, buffer);}
}// server waits for a message from client, response it, and close the connection, then wait for the next client to connect
// the listen socket and connection sockets work in the same single thread
int http_single_thread(int sock, char* buffer, int buf_size)
{int r=0;long recv_size=0, buf_size1=buf_size-1;recv_size = recv(sock, buffer, buf_size1, 0);if(recv_size<0) { printf("receive from client failed\n"); return -1;}buffer[recv_size]=0; // set string endprintf("received %ld bytes data: \n%s\n", recv_size, buffer);int send_size = make_http_response(buffer, buf_size);r = send(sock, buffer, send_size, 0);if(r>0) printf("[sent to client]\n%s\n[end of sent]\n", buffer);return r;
}int main(int argc, char * argv[])
{int r=0; enum MODE mode=SHOW_CLIENT_MESSAGES; FUN_process_connection_sock fun_sock=show_client_messages_single_thread;if(argc>=2){if(strcmp(MODE_http_single_thread, argv[1])==0) { mode=HTTP_SINGLE_THREAD; fun_sock=http_single_thread; printf("server work in http_single_thread mode\n"); }}if(mode==SHOW_CLIENT_MESSAGES) printf("server work in client_messages_single_thread mode\n");int listen_sock, sock;struct sockaddr_in server_addr, client_addr;socklen_t addrlen = sizeof(struct sockaddr_in);int client_count=0; char *client_ip; int client_port;char buffer[SOCK_BUF_SIZE] = { 0 };long send_size=0;if ((listen_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("create server listen socket failed\n"); goto fail; }printf("create server listen socket succeed\n");server_addr.sin_family = AF_INET; // IPv4server_addr.sin_addr.s_addr = INADDR_ANY; // 监听所有本地IP地址server_addr.sin_port = htons(SERVER_LISTEN_PORT);if (bind(listen_sock, (struct sockaddr*)&server_addr, addrlen) == -1) { perror("server listen socket bind to ip:port failed\n"); goto fail_close; }printf("bind server listen socket to port %d succeed\n", SERVER_LISTEN_PORT);if (listen(listen_sock, SOCK_CONN_QUEUE_MAX) == -1) { perror("server socket start listening failed\n"); goto fail_close; }printf("server socket starts listening ...\n");while((sock = accept(listen_sock, (struct sockaddr*)&client_addr, &addrlen)) > 0){ client_count++;client_ip = inet_ntoa(client_addr.sin_addr); client_port = ntohs(client_addr.sin_port);printf("%d --------------- \nserver socket accepted a client connection: %s:%d ---------------\n", client_count, client_ip, client_port);// if(set_socket_options(sock) == -1) goto end_close_client;if(fun_sock(sock, buffer, SOCK_BUF_SIZE) < 0) goto end_close_client;end_close_client: close(sock);printf("waiting for next client ...\n");}close(listen_sock); goto succeed;fail_close: close(listen_sock); goto fail;succeed: return r;fail: r=1; return r;
}
![[UE虚幻引擎] DTSpeechVoice 文字转语音播放 插件说明](http://pic.xiahunao.cn/[UE虚幻引擎] DTSpeechVoice 文字转语音播放 插件说明)
 CMake 入门与进阶)
