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菜鸟socket编程求助

菜鸟
2004-11-20 00:47:00    评分

鄙人刚开始接触vxworks,现尝试Socket编程

在Tornado的Help中找了一段代码进行测试(代码见下)

在两台pc上运行Tornado,一台执行tcpServer,一台执行tcpClient

结果,tcpClient端出现connect:errno=0x41的错误

哪位大虾给解释一下,或者帮忙调试一下程序。

问题可能很简单,大侠们不要见笑,如能帮助,在下不胜感激!

/* tcpClient.c - TCP client example */ /* DESCRIPTION This file contains the client-side of the VxWorks TCP example code. The example code demonstrates the usage of several BSD 4.4-style socket routine calls. */ /* includes for tcpClient.c*/ #include "vxWorks.h" #include "sockLib.h" #include "inetLib.h" #include "stdioLib.h" #include "strLib.h" #include "hostLib.h" #include "ioLib.h"

/* includes for tcpServer.c*/ #include "taskLib.h" #include "fioLib.h"

/* function declarations for tcpServer.c*/ VOID tcpServerWorkTask (int sFd, char * address, u_short port);

/****************************************************************************/

/* tcpExample.h - header used by both TCP server and client examples */ /* defines */ #define SERVER_PORT_NUM 5001 /* server's port number for bind() */ #define SERVER_WORK_PRIORITY 100 /* priority of server's work task */ #define SERVER_STACK_SIZE 10000 /* stack size of server's work task */ #define SERVER_MAX_CONNECTIONS 4 /* max clients connected at a time */ #define REQUEST_MSG_SIZE 1024 /* max size of request message */ #define REPLY_MSG_SIZE 500 /* max size of reply message */ /* structure for requests from clients to server */ struct request { int reply; /* TRUE = request reply from server */ int msgLen; /* length of message text */ char message[REQUEST_MSG_SIZE]; /* message buffer */ };

/**************************************************************************** * * tcpClient - send requests to server over a TCP socket * * This routine connects over a TCP socket to a server, and sends a * user-provided message to the server. Optionally, this routine * waits for the server's reply message. * * This routine may be invoked as follows: * -> tcpClient "remoteSystem" * Message to send: * Hello out there * Would you like a reply (Y or N): * y * value = 0 = 0x0 * -> MESSAGE FROM SERVER: * Server received your message * * RETURNS: OK, or ERROR if the message could not be sent to the server. */ STATUS tcpClient(void) // ( // char * serverName /* name or IP address of server */ // ) { struct request myRequest; /* request to send to server */ struct sockaddr_in serverAddr; /* server's socket address */ char replyBuf[REPLY_MSG_SIZE]; /* buffer for reply */ char reply; /* if TRUE, expect reply back */ int sockAddrSize; /* size of socket address structure */ int sFd; /* socket file descriptor */ int mlen; /* length of message */ /* create client's socket */ if ((sFd = socket (AF_INET, SOCK_STREAM, 0)) == ERROR) { perror ("socket"); return (ERROR); } printf("socket OK!\n");

/* bind not required - port number is dynamic */ /* build server socket address */ sockAddrSize = sizeof (struct sockaddr_in); bzero ((char *) &serverAddr, sockAddrSize); serverAddr.sin_family = AF_INET; serverAddr.sin_len = (u_char) sockAddrSize; serverAddr.sin_port = htons (SERVER_PORT_NUM);

if (((serverAddr.sin_addr.s_addr = inet_addr ("192.168.1.251")) == ERROR) && ((serverAddr.sin_addr.s_addr = hostGetByName ("192.168.1.251")) == ERROR)) { perror ("unknown server name"); close (sFd); return (ERROR); } /* connect to server */ if (connect (sFd, (struct sockaddr *) &serverAddr, sockAddrSize) == ERROR) { perror ("connect"); close (sFd); return (ERROR); } printf("connect OK!\n"); /* build request, prompting user for message */ printf ("Message to send: \n"); mlen = read (STD_IN, myRequest.message, REQUEST_MSG_SIZE); myRequest.msgLen = mlen; myRequest.message[mlen - 1] = '\0'; printf ("Would you like a reply (Y or N): \n"); read (STD_IN, &reply, 1); switch (reply) { case 'y': case 'Y': myRequest.reply = TRUE; break; default: myRequest.reply = FALSE; break; } /* send request to server */

if (write (sFd, (char *) &myRequest, sizeof (myRequest)) == ERROR) { perror ("write"); close (sFd); return (ERROR); }

if (myRequest.reply) /* if expecting reply, read and display it */

{ if (read (sFd, replyBuf, REPLY_MSG_SIZE) < 0) { perror ("read"); close (sFd); return (ERROR); }

printf ("MESSAGE FROM SERVER:\n%s\n", replyBuf); } close (sFd); return (OK); }

/* tcpServer.c - TCP server example */

/* DESCRIPTION This file contains the server-side of the VxWorks TCP example code. The example code demonstrates the usage of several BSD 4.4-style socket routine calls. */

/**************************************************************************** * * tcpServer - accept and process requests over a TCP socket * * This routine creates a TCP socket, and accepts connections over the socket * from clients. Each client connection is handled by spawning a separate * task to handle client requests. * * This routine may be invoked as follows: * -> sp tcpServer * task spawned: id = 0x3a6f1c, name = t1 * value = 3829532 = 0x3a6f1c * -> MESSAGE FROM CLIENT (Internet Address 150.12.0.10, port 1027): * Hello out there * * RETURNS: Never, or ERROR if a resources could not be allocated. */

STATUS tcpServer (void) { struct sockaddr_in serverAddr; /* server's socket address */ struct sockaddr_in clientAddr; /* client's socket address */ int sockAddrSize; /* size of socket address structure */ int sFd; /* socket file descriptor */ int newFd; /* socket descriptor from accept */ int ix = 0; /* counter for work task names */ char workName[16]; /* name of work task */ /* set up the local address */ sockAddrSize = sizeof (struct sockaddr_in); bzero ((char *) &serverAddr, sockAddrSize); serverAddr.sin_family = AF_INET; serverAddr.sin_len = (u_char) sockAddrSize; serverAddr.sin_port = htons (SERVER_PORT_NUM); serverAddr.sin_addr.s_addr = htonl (INADDR_ANY); /* create a TCP-based socket */ if ((sFd = socket (AF_INET, SOCK_STREAM, 0)) == ERROR) { perror ("socket"); return (ERROR); } printf("socket OK!\n"); /* bind socket to local address */ if (bind (sFd, (struct sockaddr *) &serverAddr, sockAddrSize) == ERROR) { perror ("bind"); close (sFd); return (ERROR); } printf("bind OK!\n"); /* create queue for client connection requests */ if (listen (sFd, SERVER_MAX_CONNECTIONS) == ERROR) { perror ("listen"); close (sFd); return (ERROR); } printf("listen OK!\n"); /* accept new connect requests and spawn tasks to process them */ FOREVER { if ((newFd = accept (sFd, (struct sockaddr *) &clientAddr, &sockAddrSize)) == ERROR) { perror ("accept"); close (sFd); return (ERROR); } printf("accept OK!\n"); sprintf (workName, "tTcpWork%d", ix++); if (taskSpawn(workName, SERVER_WORK_PRIORITY, 0, SERVER_STACK_SIZE, (FUNCPTR) tcpServerWorkTask, newFd, (int) inet_ntoa (clientAddr.sin_addr), ntohs (clientAddr.sin_port), 0, 0, 0, 0, 0, 0, 0) == ERROR) { /* if taskSpawn fails, close fd and return to top of loop */ perror ("taskSpawn"); close (newFd); } } }

/**************************************************************************** * * tcpServerWorkTask - process client requests * * This routine reads from the server's socket, and processes client * requests. If the client requests a reply message, this routine * will send a reply to the client. * * RETURNS: N/A. */

VOID tcpServerWorkTask ( int sFd, /* server's socket fd */ char * address, /* client's socket address */ u_short port /* client's socket port */ ) { struct request clientRequest; /* request/message from client */ int nRead; /* number of bytes read */ static char replyMsg[] = "Server received your message"; /* read client request, display message */

while ((nRead = fioRead (sFd, (char *) &clientRequest, sizeof (clientRequest))) > 0) { printf ("MESSAGE FROM CLIENT (Internet Address %s, port %d):\n%s\n", address, port, clientRequest.message); free (address); /* free malloc from inet_ntoa() */ if (clientRequest.reply) if (write (sFd, replyMsg, sizeof (replyMsg)) == ERROR) perror ("write"); } if (nRead == ERROR) /* error from read() */ perror ("read"); close (sFd); /* close server socket connection */ }




关键词: 菜鸟     socket     编程     求助     client     ad    

菜鸟
2004-11-25 00:25:00    评分
2楼

0x41 = S_errno_EHOSTUNREACH

两台机器连不通

可以先试一下PING,看是否通,再检查网络设置


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