FreeCalypso > hg > freecalypso-tools

annotate rvinterf/libinterf/launchrvif.c @ 737:6d97866bad79

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first round of documentation for DUART28C boot control addition
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 16 Sep 2020 06:10:39 +0000
parents e40bb5a6c6b9
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 client programs.
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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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13 static char rvinterf_pathname[] = "/opt/freecalypso/bin/rvinterf";
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15 extern int sock;
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17 char *rvinterf_ttyport, *rvinterf_Bopt, *rvinterf_lopt, *rvinterf_wopt;
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19 launch_rvinterf(do_delay)
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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 if (do_delay)
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63 usleep(30000);
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64 return 0;
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65 }