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作业--day34

news 2025/7/28 14:44:14

使用select完成TCP并发服务器和客户端

server.c

#include <myhead.h>#define PORT 8888
#define IP "192.168.125.137"int main(int argc, const char *argv[])
{int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd == -1){perror("socket error");return -1;}int reuse = -1;if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1){perror("setsockopt error");return -1;}struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);if(bind(sfd, (struct sockaddr *)&sin, sizeof(sin)) == -1){perror("bind error");return -1;}if(listen(sfd, 128) == -1){perror("listen error");return -1;}struct sockaddr_in cin;socklen_t socklen = sizeof(cin);char buf[128] = "";fd_set readfds;FD_ZERO(&readfds);FD_SET(0, &readfds);FD_SET(sfd, &readfds);int res = -1;fd_set tempfds;struct sockaddr_in arr_cin[1024];int maxfd = sfd;while(1){tempfds = readfds;res = select(maxfd+1, &tempfds, NULL, NULL, NULL);if(res == -1){perror("select error");return -1;}else if(res == 0){puts("time out");return -1;}for(int index=0; index<=maxfd; index++){if(!FD_ISSET(index, &tempfds)){continue;}if(index == sfd){int newfd = accept(sfd, (struct sockaddr *)&cin, &socklen);if(newfd == -1){perror("accept error");return -1;}arr_cin[newfd] = cin;printf("[%s: %d] 已连接\n", inet_ntoa(arr_cin[newfd].sin_addr), ntohs(arr_cin[newfd].sin_port));FD_SET(newfd, &readfds);if(newfd > maxfd){maxfd = newfd;}}else if(index == 0){fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] = 0;for(int i=4; i<=maxfd; i++){send(i, buf, sizeof(buf), 0);}}else{bzero(buf, sizeof(buf));int res = recv(index, buf, sizeof(buf), 0);if(res == 0){puts("客户端已下线");close(index);FD_CLR(index, &readfds);for(int i=maxfd; i>0; i--){if(FD_ISSET(i, &readfds)){maxfd = i;break;}}continue;}printf("[%s: %d] %s\n", inet_ntoa(arr_cin[index].sin_addr), ntohs(arr_cin[index].sin_port), buf);strcat(buf, "*_*");send(index, buf, sizeof(buf), 0);}}}close(sfd);return 0;
}

client.c

#include <myhead.h>#define PORT 8888
#define IP "192.168.125.137"int main(int argc, const char *argv[])
{int cfd = socket(AF_INET, SOCK_STREAM, 0);if(cfd == -1){perror("socket error");return -1;}struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);if(connect(cfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){perror("connect error");return -1;}fd_set readfds;fd_set tempfds;FD_ZERO(&readfds);FD_SET(0, &readfds);FD_SET(cfd, &readfds);int res = -1;struct sockaddr_in arr_cin[1024];char buf[128] = "";while(1){tempfds = readfds;res = select(cfd+1, &tempfds, NULL, NULL, NULL);if(res == -1){perror("select error");return -1;}else if(res == 0){puts("time out");return -1;}if(FD_ISSET(cfd, &tempfds)){bzero(buf, sizeof(buf));res = recv(cfd, buf, sizeof(buf), 0);if(res == 0){puts("服务器已下线");break;}printf("[%s: %d] %s\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), buf);}if(FD_ISSET(0, &tempfds)){bzero(buf, sizeof(buf));fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] = 0;send(cfd, buf, sizeof(buf), 0);}}close(cfd);return 0;
}

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使用poll完成TCP并发服务器和客户端

server.c

#include <myhead.h>#define PORT 8888
#define IP "192.168.125.137"void del_arr(struct pollfd fds[], int *max, int index){for(int i=index; i<(*max)-1; i++){fds[i] = fds[i+1];}(*max) -= 1;
}int main(int argc, const char *argv[])
{int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd == -1){perror("socket error");return -1;}int reuse = -1;if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1){perror("setsockopt error");return -1;}struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);if(bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){perror("bind error");return -1;}if(listen(sfd, 128) == -1){perror("listen error");return -1;}struct sockaddr_in cin;socklen_t socklen = sizeof(cin);char buf[128] = "";int res = -1;struct pollfd fds[1024];fds[0].fd = 0;fds[0].events = POLLIN;fds[1].fd = sfd;fds[1].events = POLLIN;struct sockaddr_in arr_cin[1024];int newfd = -1;int max = 2;while(1){res = poll(fds, max, -1);if(res < 0){perror("poll error");return -1;}else if(res == 0){puts("time out");return -1;}for(int index=0; index<max; index++){if(fds[index].revents == POLLIN){if(index == 0){bzero(buf, sizeof(buf));fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] = 0;for(int i=2; i<max; i++){send(fds[i].fd, buf, sizeof(buf), 0);}}else if(index == 1){if((newfd = accept(fds[index].fd, (struct sockaddr*)&cin, &socklen)) == -1){perror("accept error");return -1;}fds[max].fd = newfd;fds[max].events = POLLIN;max++;arr_cin[newfd] = cin;printf("[%s: %d] 已上线\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));}else{bzero(buf, sizeof(buf));res = recv(fds[index].fd, buf, sizeof(buf), 0);if(res == 0){puts("客户端已下线");del_arr(fds, &max, index);continue;}printf("[%s: %d] %s\n", inet_ntoa(arr_cin[fds[index].fd].sin_addr), ntohs(arr_cin[fds[index].fd].sin_port), buf);}}}}close(sfd);return 0;
}

client.c

#include <myhead.h>#define PORT 8888
#define IP "192.168.125.137"int main(int argc, const char *argv[])
{int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd == -1){perror("socket error");return -1;}int reuse = -1;if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1){perror("setsockopt error");return -1;}struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(PORT);sin.sin_addr.s_addr = inet_addr(IP);if(connect(sfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){perror("connect error");return -1;}char buf[128] = "";int res = -1;struct pollfd fds[2];fds[0].fd = 0;fds[0].events = POLLIN;fds[1].fd = sfd;fds[1].events = POLLIN;while(1){res = poll(fds, 2, -1);if(res < 0){perror("poll error");return -1;}else if(res == 0){puts("time out");return -1;}if(fds[0].revents == POLLIN){bzero(buf, sizeof(buf));fgets(buf, sizeof(buf), stdin);buf[strlen(buf) - 1] = 0;send(sfd, buf, sizeof(buf), 0);}if(fds[1].revents == POLLIN){bzero(buf, sizeof(buf));res = recv(sfd, buf, sizeof(buf), 0);if(res == 0){puts("服务器已下线");break;}printf("[%s: %d] %s\n", inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), buf);}}close(sfd);return 0;
}