FreeCalypso > hg > freecalypso-tools

annotate rvinterf/etmsync/connect.c @ 407:19e5a3e2f9c0

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fcup-settime: moved time() retrieval a little closer to the output A fundamental problem with all simple time transfer tools is that there is always some delay between the time retrieval on the source system and that transmitted time being set on the destination, and the resulting time on the destination system is off by that delay amount. This delay cannot be fully eliminated when working in a simple environment like ours, but we should make our best effort to minimize it. In the present case, moving the atinterf_init() call before the time() retrieval should make a teensy-tiny improvement.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Aug 2018 21:52:17 +0000
parents e7502631a0f9
children
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1 /*
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2 * Connecting to an already running rvinterf process
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/socket.h>
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7 #include <sys/un.h>
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8 #include <stdio.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <stdlib.h>
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12 #include <unistd.h>
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13 #include "pktmux.h"
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14 #include "localsock.h"
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15 #include "exitcodes.h"
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16
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17 char *socket_pathname = "/tmp/rvinterf_socket";
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18 int sock;
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19
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20 connect_local_socket()
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21 {
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22 /* local socket binding voodoo copied from osmocon */
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23 struct sockaddr_un local;
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24 unsigned int namelen;
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25 int rc;
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26
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27 sock = socket(AF_UNIX, SOCK_STREAM, 0);
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28 if (sock < 0) {
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29 perror("socket(AF_UNIX, SOCK_STREAM, 0)");
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30 exit(ERROR_UNIX);
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31 }
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32
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33 local.sun_family = AF_UNIX;
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34 strncpy(local.sun_path, socket_pathname, sizeof(local.sun_path));
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35 local.sun_path[sizeof(local.sun_path) - 1] = '\0';
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37 /* we use the same magic that X11 uses in Xtranssock.c for
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38 * calculating the proper length of the sockaddr */
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39 #if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
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40 local.sun_len = strlen(local.sun_path);
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41 #endif
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42 #if defined(BSD44SOCKETS) || defined(SUN_LEN)
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43 namelen = SUN_LEN(&local);
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44 #else
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45 namelen = strlen(local.sun_path) +
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46 offsetof(struct sockaddr_un, sun_path) + 1;
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47 #endif
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48
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49 rc = connect(sock, (struct sockaddr *) &local, namelen);
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50 if (rc != 0) {
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51 perror(socket_pathname);
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52 exit(ERROR_RVINTERF);
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53 }
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54
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55 return(0);
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56 }