c语言网络编程-标准步骤，真的很简单啊
server.c
代码如下:
#include
#include
#include
#include
#include
#include
#include
#include
#define PORT 4444
#define BACKLOG 5
int main(int argc, char *argv[]) {
int sock_fd, new_fd;
struct sockaddr_in server_addr, client_addr;
int sin_size;
int nbytes;
int on = 1;
char buffer[1024];
if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
memset(&server_addr, 0, sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(PORT);
if (bind(sock_fd, (struct sockaddr *)(&server_addr), sizeof(struct sockaddr)) == -1) {
perror("bind");
exit(1);
}
if (listen(sock_fd, BACKLOG) == -1) {
perror("listen");
exit(1);
}
printf("Server start... n");
while (1) {
sin_size = sizeof(struct sockaddr_in);
if ((new_fd = accept(sock_fd, (struct sockaddr *)(&client_addr), &sin_size)) == -1) {
perror("accept");
exit(1);
}
printf("Server get connection from %sn", inet_ntoa(client_addr.sin_addr));
if ((nbytes = read(new_fd, buffer, 1024)) == -1) {
perror("read");
exit(1);
}
buffer[nbytes] = '';
printf("Server received: %sn", buffer);
close(new_fd);
}
return 0;
}
client.c
代码如下:
#include
#include
#include
#include
#include
#include
#include
#define PORT 4444
int main(int argc, char *argv[]) {
int sock_fd;
struct sockaddr_in server_addr;
struct hostent *host;
char buffer[1024];
if (argc < 2) {
perror("Need hostname");
exit(1);
}
if ((host = gethostbyname(argv[1])) == NULL) {
perror("gethostbyname");
exit(1);
}
if ((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("socket");
exit(1);
}
memset(&server_addr, 0, sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
server_addr.sin_addr = *((struct in_addr *)host->h_addr);
if (connect(sock_fd, (struct sockaddr *)(&server_addr), sizeof(struct sockaddr)) == -1) {
perror("connect");
exit(1);
}
printf("Please input something:n");
fgets(buffer, 1024, stdin);
write(sock_fd, buffer, strlen(buffer));
close(sock_fd);
return 0;
}