/* server.c - server process for simple client/server network demo */ static char *copyright = "Copyright 1986-1989, Wind River Systems, Inc."; /* modification history -------------------- 01i,31oct91,rrr passed through the ansification filter -changed copyright notice 01h,25oct90,lpf put back the HP version's bcopy. 01g,07jun89,gae used ntohs on SERVER_NUM; changed SOCKADDR to struct sockaddr. 01c,06apr87,gae caught some lint. Got rid of excess includes. 01b,12jan87,jlf minor rearrangement, to meet WRS coding conventions. changed to " in includes. 01a,17sep86,llk written. */ /* DESCRIPTION This is a simple demonstration of the server-client relationship. This is the server. The other half of the demonstration is in client.c */ #include #include #include #include "serverDemo.h" #if defined(HOST_HP) void bzero (s, n) char *s; int n; { memset (s, '\0', n); } #endif /******************************************************************************* * * main - server process * * This is a simple server program which communicates with a client * through a socket. It reads (recv's) characters, one at a time, * from the client and echos them to standard output. When the client * goes away, the server also goes away (the server reads 0 characters * from the socket). * * The server runs on UNIX, client runs on VxWorks. * * See the manual page on sockets for more information. */ main () { int sock, snew; /* socket fd's */ struct sockaddr_in serverAddr; /* server's address */ struct sockaddr_in clientAddr; /* client's address */ int client_len; /* length of clientAddr */ char c; extern int errno; /* for UNIX error referencing */ /* Zero out the sock_addr structures. * This MUST be done before the socket calls. */ bzero (&serverAddr, sizeof (serverAddr)); bzero (&clientAddr, sizeof (clientAddr)); /* Open the socket. * Use ARPA Internet address format and stream sockets. * Format described in "socket.h". */ sock = socket (AF_INET, SOCK_STREAM, 0); if (sock == -1) exit (1); /* Set up our internet address, and bind it so the client can connect. */ serverAddr.sin_family = AF_INET; serverAddr.sin_port = htons(SERVER_NUM); printf ("\nBinding SERVER\n", serverAddr.sin_port); if (bind (sock, (struct sockaddr *)&serverAddr, sizeof (serverAddr)) == -1) { printf ("bind failed, errno = %d\n", errno); close (sock); exit (1); } /* Listen, for the client to connect to us. */ printf ("Listening to client\n"); if (listen (sock, 2) == -1) { printf ("listen failed\n"); close (sock); exit (1); } /* The client has connected. Accept, and receive chars */ printf ("Accepting CLIENT\n"); client_len = sizeof (clientAddr); snew = accept (sock, (struct sockaddr *)&clientAddr, &client_len); if (snew == -1) { printf ("accept failed\n"); close (sock); exit (1); } printf ("CLIENT: port = %d: family = %d: addr = %lx:\n", ntohs(clientAddr.sin_port), clientAddr.sin_family, ntohl(clientAddr.sin_addr.s_addr)); /* repeatedly recieve characters from client and put on stdout */ for (;;) { if (recv (snew, &c, 1, 0) == 0) { /* client has disappeared */ break; } putchar (c); } /* close the socket from the UNIX side */ close (sock); close (snew); printf ("\n...goodbye\n"); }
