📄 code30_2.htm
字号:
<HTML><HEAD><TITLE>NETBOOK - Code Sample 30_2</TITLE></HEAD><BODY BGCOLOR="#FFFFFF"><P><TABLE BORDER="0" CELLPADDING="5" CELLSPACING="0" WIDTH="600"><TR> <TD WIDTH="112" VALIGN="TOP" BGCOLOR="#759AC4" CELLPADDING="0"><img src="../pgmatrls/sidebar.gif" width="112" height="410" usemap="#sidebar" ismap alt="" border="0" ><map name="sidebar"><area shape="rect" coords="0,325,100,364" href="../othrpags/page22.htm" ><area shape="rect" coords="0,287,100,326" href="../othrpags/page17.htm" ><area shape="rect" coords="0,248,100,287" href="../othrpags/page18.htm" ><area shape="rect" coords="0,364,100,404" href="../othrpags/code.htm" ><area shape="rect" coords="0,210,100,248" href="../othrpags/page15.htm" ><area shape="rect" coords="0,170,100,210" href="../othrpags/page03.htm" ><area shape="rect" coords="0,132,100,170" href="../othrpags/page10.htm" ><area shape="rect" coords="0,93,100,132" href="../index.htm" ><AREA SHAPE="DEFAULT" NOHREF></map> </TD><TD WIDTH="420" VALIGN="TOP" BGCOLOR="#FFFFFF"><CENTER><H1>Code Sample 30_2</H1></CENTER><PRE>/* server.c - code for example server program that uses TCP */#ifndef unix#define WIN32#include <windows.h>#include <winsock.h> #else#define closesocket close#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>#endif#include <stdio.h>#include <string.h>#define PROTOPORT 5193 /* default protocol port number */#define QLEN 6 /* size of request queue */int visits = 0; /* counts client connections *//*------------------------------------------------------------------------ * Program: server * * Purpose: allocate a socket and then repeatedly execute the following: * (1) wait for the next connection from a client * (2) send a short message to the client * (3) close the connection * (4) go back to step (1) * * Syntax: server [ port ] * * port - protocol port number to use * * Note: The port argument is optional. If no port is specified, * the server uses the default given by PROTOPORT. * *------------------------------------------------------------------------ */main(argc, argv)int argc;char *argv[];{ struct hostent *ptrh; /* pointer to a host table entry */ struct protoent *ptrp; /* pointer to a protocol table entry */ struct sockaddr_in sad; /* structure to hold server's address */ struct sockaddr_in cad; /* structure to hold client's address */ int sd, sd2; /* socket descriptors */ int port; /* protocol port number */ int alen; /* length of address */ char buf[1000]; /* buffer for string the server sends */#ifdef WIN32 WSADATA wsaData; WSAStartup(0x0101, &wsaData);#endif memset((char *)&sad,0,sizeof(sad)); /* clear sockaddr structure */ sad.sin_family = AF_INET; /* set family to Internet */ sad.sin_addr.s_addr = INADDR_ANY; /* set the local IP address */ /* Check command-line argument for protocol port and extract */ /* port number if one is specified. Otherwise, use the default */ /* port value given by constant PROTOPORT */ if (argc > 1) { /* if argument specified */ port = atoi(argv[1]); /* convert argument to binary */ } else { port = PROTOPORT; /* use default port number */ } if (port > 0) /* test for illegal value */ sad.sin_port = htons((u_short)port); else { /* print error message and exit */ fprintf(stderr,"bad port number %s\n",argv[1]); exit(1); } /* Map TCP transport protocol name to protocol number */ if ( ((int)(ptrp = getprotobyname("tcp"))) == 0) { fprintf(stderr, "cannot map \"tcp\" to protocol number"); exit(1); } /* Create a socket */ sd = socket(PF_INET, SOCK_STREAM, ptrp->p_proto); if (sd < 0) { fprintf(stderr, "socket creation failed\n"); exit(1); } /* Bind a local address to the socket */ if (bind(sd, (struct sockaddr *)&sad, sizeof(sad)) < 0) { fprintf(stderr,"bind failed\n"); exit(1); } /* Specify size of request queue */ if (listen(sd, QLEN) < 0) { fprintf(stderr,"listen failed\n"); exit(1); } /* Main server loop - accept and handle requests */ while (1) { alen = sizeof(cad); if ( (sd2=accept(sd, (struct sockaddr *)&cad, &alen)) < 0) { fprintf(stderr, "accept failed\n"); exit(1); } visits++; sprintf(buf,"This server has been contacted %d time%s\n", visits,visits==1?".":"s."); send(sd2,buf,strlen(buf),0); closesocket(sd2); }}</PRE><p><p><p><HR WIDTH=89% ALIGN=CENTER SIZE=2><center><h2>Item information</h2></center><p><TABLE CELLSPACING="0"><TD ALIGN="LEFT" VALIGN="TOP">Caption:</TD><TD ALIGN="LEFT">Code sample for server in section 30.7</TD><TR><TD ALIGN="LEFT">Code sample:</TD><TD ALIGN="LEFT">30_2</td><tr><TD ALIGN="LEFT">Type:</TD><TD ALIGN="LEFT">code sample</TD><TR><TD ALIGN="LEFT">Item:</TD><TD ALIGN="LEFT"><A HREF="./code30_2.txt">Code sample 30_2</A> without caption</TD><TR><TD ALIGN="LEFT">Keywords:</TD><TD ALIGN="LEFT">server, server code</TR></TABLE></tr></TABLE></BODY></HTML>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -