select实现tcp并发服务器

#include "test.h"#define SER_IP "192.168.42.106"
#define SER_PORT 8888int create_socket()
{int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd == -1){perror("socket error");exit(-1);}printf("sfd = %d\n", sfd);return sfd;
}int start_reuse(int sfd)
{int reuse = -1; if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1){perror("setsockopt error");exit(-1);}printf("端口号快速重用成功\n");return reuse;
}void start_listen(int sfd)
{if (listen(sfd, 128) == -1){perror("listen error");exit(-1);}printf("listen success\n");
}int main(int argc, const char *argv[])
{int sfd = create_socket();int reuse = start_reuse(sfd);struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(SER_PORT);sin.sin_addr.s_addr = inet_addr(SER_IP);if (bind(sfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){perror("bind error");return -1;}start_listen(sfd);struct sockaddr_in cin;socklen_t socklen = sizeof(cin);int newfd = -1;char sbuf[128] = "";fd_set readfds, tempfds;FD_ZERO(&readfds);FD_SET(0, &readfds);FD_SET(sfd, &readfds);int maxfd = sfd;struct sockaddr_in cin_arr[1024];while(1){tempfds = readfds;int res = select(maxfd + 1, &tempfds, NULL, NULL, NULL);if (res == -1){perror("select error");exit(-1);}else if (res == 0){printf("time out\n");exit(-1);}for (int i = 0; i < maxfd; i++){if (!FD_ISSET(i, &tempfds)){continue;}if (i == sfd){newfd = accept(sfd, (struct sockaddr*)&cin, &socklen);if (newfd == -1){perror("accept error");exit(-1);}printf("newfd=%d 您已有新客户上线\n", newfd);printf("客户端IP: %s, 端口号: %d\n", inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));FD_SET(newfd, &readfds);cin_arr[newfd] = cin;if (newfd > maxfd){maxfd = newfd;}}else if (i == 0){fgets(sbuf, sizeof(sbuf), stdin);sbuf[strlen(sbuf) - 1] = 0;printf("触发了键盘输入事件: %s\n", sbuf);for (int k = 4; k < maxfd; k++){send(k, sbuf, strlen(sbuf), 0);}}else{char rbuf[128] = "";bzero(rbuf, sizeof(rbuf));int res = recv(i, rbuf, sizeof(rbuf), 0);if (res == 0){printf("客户端已下线\n");close(i);FD_CLR(i, &readfds);for (int j = maxfd; j >= 0; j--){if (FD_ISSET(j, &readfds)){maxfd = j;break;}}continue;}printf("[%s:%d]: %s\n", inet_ntoa(cin_arr[i].sin_addr), ntohs(cin_arr[i].sin_port), rbuf);strcat(rbuf, "*_*");send(i, rbuf, strlen(rbuf), 0);}}}close(sfd);return 0;
}

poll实现tcp客户端

#include "test.h"#define SER_IP "192.168.191.128"
#define SER_PORT 8888#define CLI_IP "192.168.191.128"
#define CLI_PORT 9999int create_socket()
{int sfd = socket(AF_INET, SOCK_STREAM, 0);if(sfd == -1){perror("socket error");exit(-1);}printf("sfd = %d\n", sfd);return sfd;
}int start_reuse(int sfd)
{int reuse = -1; if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) == -1){perror("setsockopt error");exit(-1);}printf("端口号快速重用成功\n");return reuse;
}void start_listen(int sfd)
{if (listen(sfd, 128) == -1){perror("listen error");exit(-1);}printf("listen success\n");
}int main(int argc, const char *argv[])
{int sfd = create_socket();int reuse = start_reuse(sfd);struct sockaddr_in cin;cin.sin_family = AF_INET;cin.sin_port = htons(CLI_PORT);cin.sin_addr.s_addr = inet_addr(CLI_IP);if (bind(sfd, (struct sockaddr*)&cin, sizeof(cin)) == -1){perror("bind error");return -1;}struct sockaddr_in sin;sin.sin_family = AF_INET;sin.sin_port = htons(SER_PORT);sin.sin_addr.s_addr = inet_addr(SER_IP);if (connect(sfd, (struct sockaddr*)&sin, sizeof(sin)) == -1){perror("connect error");exit(-1);}printf("connect success\n");struct pollfd pfd[2];pfd[0].fd = 0;pfd[0].events = POLLIN;pfd[1].fd = sfd;pfd[1].events = POLLIN;char wbuf[128] = "";while(1){int res = poll(pfd, 2, -1);if (res == -1){perror("poll error");exit(-1);}else if (res == 0){printf("time out\n");exit(-1);}if (pfd[0].revents == POLLIN){bzero(wbuf, sizeof(wbuf));printf("请输入>>>");fgets(wbuf, sizeof(wbuf), stdin);wbuf[strlen(wbuf) - 1] = 0;send(sfd, wbuf, strlen(wbuf), 0);printf("发送成功\n");if (strcmp(wbuf, "quit") == 0){break;}}if (pfd[1].revents == POLLIN){bzero(wbuf, sizeof(wbuf));recv(sfd, wbuf, sizeof(wbuf), 0);printf("收到消息: %s\n", wbuf);}}close(sfd);return 0;
}