/* * Copyright (c) 1993 W. Richard Stevens.  All rights reserved. * Permission to use or modify this software and its documentation only for * educational purposes and without fee is hereby granted, provided that * the above copyright notice appear in all copies.  The author makes no * representations about the suitability of this software for any purpose. * It is provided "as is" without express or implied warranty. */#include	"sock.h"voidbuffers(int sockfd){	int		n, optlen;		/* Allocate the read and write buffers. */	if (rbuf == NULL) {		if ( (rbuf = malloc(readlen)) == NULL)			err_sys("malloc error for read buffer");	}	if (wbuf == NULL) {		if ( (wbuf = malloc(writelen)) == NULL)			err_sys("malloc error for write buffer");	}		/* Set the socket send and receive buffer sizes (if specified).		   The receive buffer size is tied to TCP's advertised window. */	if (rcvbuflen) {		if (setsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, (char *) &rcvbuflen,													sizeof(rcvbuflen)) < 0)			err_sys("SO_RCVBUF setsockopt error");			optlen = sizeof(n);		if (getsockopt(sockfd, SOL_SOCKET, SO_RCVBUF, (char *) &n,															&optlen) < 0)			err_sys("SO_RCVBUF getsockopt error");		if (n != rcvbuflen)			err_quit("rcvbuflen = %d, SO_RCVBUF = %d", rcvbuflen, n);		if (verbose)			fprintf(stderr, "SO_RCVBUF = %d\n", n);	}	if (sndbuflen) {		if (setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, (char *) &sndbuflen,													sizeof(sndbuflen)) < 0)			err_sys("SO_SNDBUF setsockopt error");			optlen = sizeof(n);		if (getsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, (char *) &n,															&optlen) < 0)			err_sys("SO_SNDBUF getsockopt error");		if (n != sndbuflen)			err_quit("sndbuflen = %d, SO_SNDBUF = %d", sndbuflen, n);		if (verbose)			fprintf(stderr, "SO_SNDBUF = %d\n", n);	}}