【转】TCP粘包问题解决方法之\n\r
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该方案,每次读取时当读到‘\n’换行符时,读取该行
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[cpp] view plain copy
- #include<unistd.h>
- #include<sys/types.h>
- #include<sys/socket.h>
- #include<netinet/in.h>
- #include<arpa/inet.h>
- #include<stdlib.h>
- #include<stdio.h>
- #include<errno.h>
- #include<string.h>
- #define ERR_EXIT(m) do{perror(m);exit(EXIT_FAILURE);}while(1)
- struct packet
- {
- int len;
- char buf[1024];
- };
- ssize_t readn(int fd, void *buf, size_t count)
- {
- size_t nleft = count;
- ssize_t nread;
- char *bufp = (char*)buf;
- while (nleft > 0)
- {
- if ((nread = read(fd, bufp, nleft)) < 0)
- {
- if (errno == EINTR)
- {
- continue;
- return -1;
- }
- else if (nread == 0)return count - nleft;
- }
- bufp = bufp + nread;
- nleft = nleft - nread;
- }
- return count;
- }
- ssize_t writen(int fd, void *buf, size_t count)
- {
- size_t nleft = count;
- ssize_t nwrite;
- char *bufp = (char*)buf;
- while (nleft > 0)
- {
- if ((nwrite = write(fd, bufp, nleft)) < 0)
- {
- if (errno == EINTR)
- {
- continue;
- return -1;
- }
- else if (nwrite == 0)continue;
- }
- bufp = bufp + nwrite;
- nleft = nleft - nwrite;
- }
- return count;
- }
- ssize_t recv_peek(int sockfd, void *buf, size_t len)
- {
- while (1)
- {
- int ret = recv(sockfd, buf, len, MSG_PEEK);
- if (ret == -1 && errno == EINTR)continue;
- return ret;
- }
- }
- ssize_t readline(int sockfd, void *buf, size_t maxline)
- {
- int ret;
- int nread;
- char *bufp = (char*)buf;
- int nleft = maxline;
- while (1)
- {
- ret = recv_peek(sockfd, bufp, nleft);
- if (ret < 0)return ret;
- else if (ret == 0)return ret;//对方关闭了套接口
- nread = ret;
- for (int i = 0; i < nread; i++)
- {
- if (bufp[i] == '\n')
- {
- ret = readn(sockfd, bufp, i + 1);//将缓冲区数据移除
- if (ret != i + 1)exit(EXIT_FAILURE);
- return ret;
- }
- }
- if (nread>nleft)exit(EXIT_FAILURE);//读到的数据不能超过缓冲区
- nleft -= nread;
- ret = readn(sockfd, bufp, nread);
- if (ret != nread)exit(EXIT_FAILURE);
- bufp += nread;
- }
- return -1;
- }
- void do_service(int connfd)
- {
- char recvbuf[1024];
- int n;
- while (1)
- {
- memset(&recvbuf, 0, sizeof(recvbuf));
- int ret = readline(connfd, recvbuf, 1204);
- if (ret == -1)
- {
- ERR_EXIT("read");
- }
- else if (ret ==0 )
- {
- printf("client cloase\n");
- break;
- }
- fputs(recvbuf, stdout);
- writen(connfd, recvbuf, strlen(recvbuf));
- }
- }
- int main(void)
- {
- int listenfd;
- if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)ERR_EXIT("socket");
- struct sockaddr_in servaddr;
- memset(&servaddr, 0, sizeof(servaddr));
- servaddr.sin_family = AF_INET;
- servaddr.sin_port = htons(5188);
- servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
- int on = 1;
- if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)ERR_EXIT("setsockopt");
- if (bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)ERR_EXIT("bind");
- if (listen(listenfd, SOMAXCONN) < 0)ERR_EXIT("listten");
- while (1)
- {
- int connfd;
- struct sockaddr_in peeraddr;
- socklen_t peerlen = sizeof(peeraddr);
- if ((connfd = accept(listenfd, (struct sockaddr*)&peeraddr, &peerlen)) < 0)ERR_EXIT("accept");
- printf("ip=%s port=%d\n", inet_ntoa(peeraddr.sin_addr), ntohs(peeraddr.sin_port));
- pid_t pid = fork();
- if (pid == -1)ERR_EXIT("fork");
- if (pid == 0)
- {
- close(listenfd);
- do_service(connfd);
- exit(EXIT_SUCCESS);
- }
- if (pid > 0)
- {
- close(connfd);
- }
- }
- close(listenfd);
- }
[cpp] view plain copy
- #include<unistd.h>
- #include<sys/types.h>
- #include<sys/socket.h>
- #include<netinet/in.h>
- #include<arpa/inet.h>
- #include<stdlib.h>
- #include<stdio.h>
- #include<errno.h>
- #include<string.h>
- #define ERR_EXIT(m) do{perror(m);exit(EXIT_FAILURE);}while(1)
- struct packet
- {
- int len;
- char buf[1024];
- };
- ssize_t readn(int fd, void *buf, size_t count)
- {
- size_t nleft = count;
- ssize_t nread;
- char *bufp = (char*)buf;
- while (nleft > 0)
- {
- if ((nread = read(fd, bufp, nleft)) < 0)
- {
- if (errno == EINTR)
- {
- continue;
- return -1;
- }
- else if (nread == 0)return count - nleft;
- }
- bufp = bufp + nread;
- nleft = nleft - nread;
- }
- return count;
- }
- ssize_t writen(int fd, void *buf, size_t count)
- {
- size_t nleft = count;
- ssize_t nwrite;
- char *bufp = (char*)buf;
- while (nleft > 0)
- {
- if ((nwrite = write(fd, bufp, nleft)) < 0)
- {
- if (errno == EINTR)
- {
- continue;
- return -1;
- }
- else if (nwrite == 0)continue;
- }
- bufp = bufp + nwrite;
- nleft = nleft - nwrite;
- }
- return count;
- }
- ssize_t recv_peek(int sockfd, void *buf, size_t len)
- {
- while (1)
- {
- int ret = recv(sockfd, buf, len, MSG_PEEK);
- if (ret == -1 && errno == EINTR)continue;
- return ret;
- }
- }
- ssize_t readline(int sockfd, void *buf, size_t maxline)
- {
- int ret;
- int nread;
- char *bufp = (char*)buf;
- int nleft = maxline;
- while (1)
- {
- ret = recv_peek(sockfd, bufp, nleft);
- if (ret < 0)return ret;
- else if (ret == 0)return ret;//对方关闭了套接口
- nread = ret;
- for (int i = 0; i < nread; i++)
- {
- if (bufp[i] == '\n')
- {
- ret = readn(sockfd, bufp, i + 1);//将缓冲区数据移除
- if (ret != i + 1)exit(EXIT_FAILURE);
- return ret;
- }
- }
- if (nread>nleft)exit(EXIT_FAILURE);//读到的数据不能超过缓冲区
- nleft -= nread;
- ret = readn(sockfd, bufp, nread);
- if (ret != nread)exit(EXIT_FAILURE);
- bufp += nread;
- }
- return -1;
- }
- int main(void)
- {
- int sockfd;
- if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)ERR_EXIT("socket");
- struct sockaddr_in servaddr;
- memset(&servaddr, 0, sizeof(servaddr));
- servaddr.sin_family = AF_INET;
- servaddr.sin_port = htons(5188);
- servaddr.sin_addr.s_addr = inet_addr("127.0.1");
- if (connect(sockfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)ERR_EXIT("bind");
- char sendbuf[1024];
- char recvbuf[1024];
- memset(sendbuf, 0, sizeof(sendbuf));
- memset(recvbuf, 0, sizeof(recvbuf));
- while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
- {
- writen(sockfd, sendbuf, strlen(sendbuf));
- int ret = readline(sockfd, recvbuf, sizeof(recvbuf));
- if (ret == -1)ERR_EXIT("read");
- if (ret == 0)
- {
- printf("server close\n");
- break;
- }
- fputs(recvbuf, stdout);
- memset(sendbuf, 0, sizeof(sendbuf));
- memset(recvbuf, 0, sizeof(recvbuf));
- }
- close(sockfd);
- }
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