?? rtime.c
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/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */#if 0static char sccsid[] = "@(#)rtime.c 2.2 88/08/10 4.0 RPCSRC; from 1.8 88/02/08 SMI";#endif/* * Copyright (c) 1988 by Sun Microsystems, Inc. *//* * rtime - get time from remote machine * * gets time, obtaining value from host * on the udp/time socket. Since timeserver returns * with time of day in seconds since Jan 1, 1900, must * subtract seconds before Jan 1, 1970 to get * what unix uses. */#define __FORCE_GLIBC#include <features.h>#include <stdio.h>#include <unistd.h>#include <rpc/rpc.h>#include <rpc/clnt.h>#include <sys/types.h>#include <sys/poll.h>#include <sys/socket.h>#include <sys/time.h>#include <rpc/auth_des.h>#include <errno.h>#include <netinet/in.h>#define NYEARS (u_long)(1970 - 1900)#define TOFFSET (u_long)(60*60*24*(365*NYEARS + (NYEARS/4)))static void do_close (int);static voiddo_close (int s){ int save; save = errno; close (s); __set_errno (save);}intrtime (struct sockaddr_in *addrp, struct rpc_timeval *timep, struct rpc_timeval *timeout){ int s; struct pollfd fd; int milliseconds; int res; unsigned long thetime; struct sockaddr_in from; int fromlen; int type; if (timeout == NULL) type = SOCK_STREAM; else type = SOCK_DGRAM; s = socket (AF_INET, type, 0); if (s < 0) return (-1); addrp->sin_family = AF_INET; addrp->sin_port = htons (IPPORT_TIMESERVER); if (type == SOCK_DGRAM) { res = sendto (s, (char *) &thetime, sizeof (thetime), 0, (struct sockaddr *) addrp, sizeof (*addrp)); if (res < 0) { do_close (s); return -1; } milliseconds = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000); fd.fd = s; fd.events = POLLIN; do res = poll (&fd, 1, milliseconds); while (res < 0 && errno == EINTR); if (res <= 0) { if (res == 0) __set_errno (ETIMEDOUT); do_close (s); return (-1); } fromlen = sizeof (from); res = recvfrom (s, (char *) &thetime, sizeof (thetime), 0, (struct sockaddr *) &from, &fromlen); do_close (s); if (res < 0) return -1; } else { if (connect (s, (struct sockaddr *) addrp, sizeof (*addrp)) < 0) { do_close (s); return -1; } res = read (s, (char *) &thetime, sizeof (thetime)); do_close (s); if (res < 0) return (-1); } if (res != sizeof (thetime)) { __set_errno (EIO); return -1; } thetime = ntohl (thetime); timep->tv_sec = thetime - TOFFSET; timep->tv_usec = 0; return 0;}
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