示例#1
0
//SNP process uses this function to receive a sendseg_arg_t structure which contains a segment and its destination node ID from the SRT process.
//Parameter tran_conn is the TCP descriptor of the connection between the SRT process and the SNP process. 
//Return 1 if a sendseg_arg_t is succefully received, otherwise return -1.
int getsegToSend(int tran_conn, int* dest_nodeID, seg_t* segPtr)
{
	sendseg_arg_t a;
	if (-1 == recvf(&a, tran_conn)) {
		return -1;
	}
	*dest_nodeID = a.nodeID;
	memcpy(segPtr, &a.seg, sizeof(seg_t));
	return 1;
}
示例#2
0
//SRT process uses this function to receive a  sendseg_arg_t structure which contains a segment and its src node ID from the SNP process. 
//Parameter network_conn is the TCP descriptor of the connection between the SRT process and the SNP process. 
//When a segment is received, use seglost to determine if the segment should be discarded, also check the checksum.  
//Return 1 if a sendseg_arg_t is succefully received, otherwise return -1.
int snp_recvseg(int network_conn, int* src_nodeID, seg_t* segPtr)
{
	sendseg_arg_t a;
	if (-1 == recvf(&a, network_conn)) {
		return -1;
	}
	*src_nodeID = a.nodeID;
	memcpy(segPtr, &a.seg, sizeof(seg_t));
	return 1;
}
示例#3
0
/*
 * Server routine to read requests and process them.
 * Commands are:
 *	Tname	- Transmit file if out of date
 *	Vname	- Verify if file out of date or not
 *	Qname	- Query if file exists. Return mtime & size if it does.
 */
void
server()
{
	char cmdbuf[BUFSIZ];
	register char *cp;

	signal(SIGHUP, cleanup);
	signal(SIGINT, cleanup);
	signal(SIGQUIT, cleanup);
	signal(SIGTERM, cleanup);
	signal(SIGPIPE, cleanup);

	rem = 0;
	oumask = umask(0);
	(void) sprintf(buf, "V%d\n", VERSION);
	(void) write(rem, buf, strlen(buf));

	for (;;) {
		cp = cmdbuf;
		if (read(rem, cp, 1) <= 0)
			return;
		if (*cp++ == '\n') {
			error("server: expected control record\n");
			continue;
		}
		do {
			if (read(rem, cp, 1) != 1)
				cleanup(0);
		} while (*cp++ != '\n' && cp < &cmdbuf[BUFSIZ]);
		*--cp = '\0';
		cp = cmdbuf;
		switch (*cp++) {
		case 'T':  /* init target file/directory name */
			catname = 1;	/* target should be directory */
			goto dotarget;

		case 't':  /* init target file/directory name */
			catname = 0;
		dotarget:
			if (exptilde(target, cp) == NULL)
				continue;
			tp = target;
			while (*tp)
				tp++;
			ack();
			continue;

		case 'R':  /* Transfer a regular file. */
			recvf(cp, S_IFREG);
			continue;

		case 'D':  /* Transfer a directory. */
			recvf(cp, S_IFDIR);
			continue;

		case 'K':  /* Transfer symbolic link. */
			recvf(cp, S_IFLNK);
			continue;

		case 'k':  /* Transfer hard link. */
			hardlink(cp);
			continue;

		case 'E':  /* End. (of directory) */
			*tp = '\0';
			if (catname <= 0) {
				error("server: too many 'E's\n");
				continue;
			}
			tp = stp[--catname];
			*tp = '\0';
			ack();
			continue;

		case 'C':  /* Clean. Cleanup a directory */
			clean(cp);
			continue;

		case 'Q':  /* Query. Does the file/directory exist? */
			query(cp);
			continue;

		case 'S':  /* Special. Execute commands */
			dospecial(cp);
			continue;

#ifdef notdef
		/*
		 * These entries are reserved but not currently used.
		 * The intent is to allow remote hosts to have master copies.
		 * Currently, only the host rdist runs on can have masters.
		 */
		case 'X':  /* start a new list of files to exclude */
			except = bp = NULL;
		case 'x':  /* add name to list of files to exclude */
			if (*cp == '\0') {
				ack();
				continue;
			}
			if (*cp == '~') {
				if (exptilde(buf, cp) == NULL)
					continue;
				cp = buf;
			}
			if (bp == NULL)
				except = bp = expand(makeblock(NAME, cp), E_VARS);
			else
				bp->b_next = expand(makeblock(NAME, cp), E_VARS);
			while (bp->b_next != NULL)
				bp = bp->b_next;
			ack();
			continue;

		case 'I':  /* Install. Transfer file if out of date. */
			opts = 0;
			while (*cp >= '0' && *cp <= '7')
				opts = (opts << 3) | (*cp++ - '0');
			if (*cp++ != ' ') {
				error("server: options not delimited\n");
				return;
			}
			install(cp, opts);
			continue;

		case 'L':  /* Log. save message in log file */
			log(lfp, cp);
			continue;
#endif

		case '\1':
			nerrs++;
			continue;

		case '\2':
			return;

		default:
			error("server: unknown command '%s'\n", cp);
		case '\0':
			continue;
		}
	}
}