參考資料：<<Linux網絡編程.pdf>>page119-205

代碼本來是全照書上抄的，后來發現編譯不成功，所以就稍微改了下。下面是我修改后的代碼：

server.c

// OOB套接字傳輸服務端(Server.c)#include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/wait.h> #include <netinet/in.h> #include <fcntl.h>#define MYPORT 4000 #define BACKLOG 10int new_fd;void sig_urg(int signo) {int n;char buf[100];printf("SIGURG received\n");n = recv(new_fd, buf, sizeof(buf)-1, MSG_OOB);buf[n] = 0;printf("recv %d OOB bytes: %s\n", n, buf); }int main(int argc, char *argv[]) {int sock_fd;struct sockaddr_in my_addr;struct sockaddr_in their_addr;int sin_size, n;char buf[100];if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1){perror("socket");return 1;}my_addr.sin_family = AF_INET;my_addr.sin_port = htons(MYPORT);my_addr.sin_addr.s_addr = INADDR_ANY; // 自動設置為自己的IPbzero(&(my_addr.sin_zero), 8); // 將結構的其余空間清零if(bind(sock_fd, (struct sockaddr*)&my_addr, sizeof(struct sockaddr)) == -1){perror("bind");return 1;}if(listen(sock_fd, BACKLOG) == -1){perror("listen");return 1;}void *old_sig_urg_handle; // 保存系統默認的信號處理函數if((old_sig_urg_handle = signal(SIGURG, sig_urg)) == SIG_ERR){perror("signal");return 1;}fcntl(sock_fd, F_SETOWN, getpid());while(1){sin_size = sizeof(struct sockaddr_in);if((new_fd = accept(sock_fd, (struct sockaddr*)&their_addr, &sin_size)) == -1){perror("accept");continue;}printf("server: got connection from [%s]\n", inet_ntoa(their_addr.sin_addr));if(!fork()){while(1){if((n = recv(new_fd, buf, sizeof(buf)-1, 0)) <= 0) // 接收正常數據{printf("recv EOF\n");break;}buf[n] = 0;printf("Recv: %d bytes: %s\n", n, buf);close(new_fd);}exit(0);}}while(waitpid(-1, NULL, WNOHANG) > 0);signal(SIGURG, old_sig_urg_handle); // 恢復系統默認的信號處理函數return 0; }

Client.c

// OOB套接字傳輸客戶端(Client.c)#include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <netdb.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h>#define MYPORT 4000 #define MAXDATASIZE 100int main(int argc, char *argv[]) {int sock_fd;char buf[MAXDATASIZE];struct hostent *he;struct sockaddr_in their_addr;if(argc < 2){fprintf(stderr, "Usage: %s <hostname>\n", argv[0]);return 1;}if((he = gethostbyname(argv[1])) == NULL){herror("gethostbyname");return 1;}if((sock_fd = socket(AF_INET, SOCK_STREAM, 0)) == -1){perror("socket");return 1;}their_addr.sin_family = AF_INET;their_addr.sin_port = htons(MYPORT);their_addr.sin_addr = *((struct in_addr*)he->h_addr);bzero(&(their_addr.sin_zero), 8);if(connect(sock_fd, (struct sockaddr*)&their_addr, sizeof(struct sockaddr)) == -1){perror("connect");return 1;}if(send(sock_fd, "123", 3, 0) == -1){perror("send");close(sock_fd);return 0;}printf("Send 3 bytes of normal data\n");sleep(1);if(send(sock_fd, "4", 1, MSG_OOB) == -1){perror("send");close(sock_fd);return 0;}printf("Send 1 byte of OOB data\n");sleep(1);if(send(sock_fd, "56", 2, 0) == -1){perror("send");close(sock_fd);return 0;}printf("Send 2 bytes of normal data\n");sleep(1);if(send(sock_fd, "7", 1, MSG_OOB) == -1){perror("send");close(sock_fd);return 0;}printf("Send 1 byte of OOB data\n");sleep(1);if(send(sock_fd, "89", 2, MSG_OOB) == -1){perror("send");close(sock_fd);return 0;}printf("Send 2 bytes of OOB data\n");sleep(1);close(sock_fd);return 0; }

運行結果：

1. Server端：

[zcm@socket #39]$./myserver server: got connection from [127.0.0.1] Recv: 3 bytes: 123 recv EOF

2. 客戶端：

[zcm@socket #25]$./myclient localhost Send 3 bytes of normal data Send 1 byte of OOB data Send 2 bytes of normal data Send 1 byte of OOB data Send 2 bytes of OOB data [zcm@socket #26]$

?

現在的疑問是：我感覺signal函數雖然調用成功了，但是沒起到作用。我認為正常情況下，sig_urg()應該會被調用，但結果是好像他沒有收到SIGURG信號，所以沒有調用sig_urg這個函數。

?

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