FreeCalypso > hg > freecalypso-tools

annotate rvinterf/etmsync/launchrvif.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 3fb0c7ad27f3
children
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1 /*
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2 * This module implements the optional "behind the scenes" invokation
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3 * of rvinterf from fc-fsio etc.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <unistd.h>
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11 #include "exitcodes.h"
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3fb0c7ad27f3 rvinterf/etmsync/launchrvif.c: new rvinterf binary location
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13 static char rvinterf_pathname[] = "/opt/freecalypso/bin/rvinterf";
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15 extern int sock;
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16
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17 char *rvinterf_ttyport, *rvinterf_Bopt, *rvinterf_lopt, *rvinterf_wopt;
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18
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19 launch_rvinterf()
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20 {
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21 int sp[2], rc;
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22 char *rvif_argv[11], Sarg[16], **ap;
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23
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24 rc = socketpair(AF_UNIX, SOCK_STREAM, 0, sp);
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25 if (rc < 0) {
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26 perror("socketpair");
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27 exit(ERROR_UNIX);
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28 }
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29 sock = sp[0];
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30 sprintf(Sarg, "-S%d", sp[1]);
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31 ap = rvif_argv;
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32 *ap++ = "rvinterf";
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33 *ap++ = Sarg;
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34 *ap++ = "-n";
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35 if (rvinterf_Bopt) {
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36 *ap++ = "-B";
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37 *ap++ = rvinterf_Bopt;
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38 }
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39 if (rvinterf_lopt) {
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40 *ap++ = "-l";
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41 *ap++ = rvinterf_lopt;
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42 }
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43 if (rvinterf_wopt) {
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44 *ap++ = "-w";
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45 *ap++ = rvinterf_wopt;
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46 }
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47 *ap++ = rvinterf_ttyport;
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48 *ap = 0;
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49 rc = vfork();
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50 if (rc < 0) {
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51 perror("vfork for launching rvinterf");
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52 exit(ERROR_UNIX);
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53 }
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54 if (!rc) {
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55 /* we are in the child - do the exec */
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56 close(sp[0]);
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57 execv(rvinterf_pathname, rvif_argv);
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58 perror(rvinterf_pathname);
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59 _exit(1);
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60 }
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61 close(sp[1]);
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62 return 0;
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63 }