FreeCalypso > hg > fc-sim-tools

annotate libcommon/backend.c @ 9:c9ef9e91dd8e

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new libcommon, initial version
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Mar 2021 06:55:38 +0000
parents
children 9eb5460f51a6
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9
c9ef9e91dd8e new libcommon, initial version
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1 /*
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2 * This module is responsible for launching and connecting
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3 * our SIM card communication back end.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <unistd.h>
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9
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10 extern unsigned calypso_fd, pcsc_reader_num;
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11
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12 static char calypso_be_pathname[] = "/opt/freecalypso/bin/fcsim-calypso-be";
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13 static char pcsc_be_pathname[] = "/opt/freecalypso/bin/fc-pcsc-backend";
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14
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15 static char *backend_prog, *backend_argv[3], backend_optarg[16];
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16
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17 FILE *cpipeF, *rpipeF;
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18
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19 static void
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20 setup_be_calypso()
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21 {
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22 backend_prog = calypso_be_pathname;
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23 backend_argv[0] = "fcsim-calypso-be";
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24 sprintf(backend_optarg, "-C%u", calypso_fd);
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25 backend_argv[1] = backend_optarg;
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26 backend_argv[2] = 0;
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27 }
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28
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29 static void
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30 setup_be_pcsc()
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31 {
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32 backend_prog = pcsc_be_pathname;
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33 backend_argv[0] = "fc-pcsc-backend";
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34 sprintf(backend_optarg, "-p%u", pcsc_reader_num);
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35 backend_argv[1] = backend_optarg;
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36 backend_argv[2] = 0;
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37 }
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38
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39 launch_backend()
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40 {
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41 int cpipe[2], rpipe[2], rc;
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42
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43 if (calypso_fd)
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44 setup_be_calypso();
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45 else
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46 setup_be_pcsc();
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47 if (pipe(cpipe) < 0 || pipe(rpipe) < 0) {
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48 perror("pipe");
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49 exit(1);
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50 }
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51 rc = vfork();
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52 if (rc < 0) {
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53 perror("vfork for launching back end");
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54 exit(1);
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55 }
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56 if (!rc) {
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57 /* we are in the child - prepare to exec the BE */
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58 dup2(cpipe[0], 0);
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59 dup2(rpipe[1], 1);
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60 close(cpipe[0]);
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61 close(cpipe[1]);
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62 close(rpipe[0]);
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63 close(rpipe[1]);
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64 /* do the exec */
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65 execv(backend_prog, backend_argv);
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66 perror(backend_prog);
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67 _exit(1);
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68 }
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69 close(cpipe[0]);
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70 close(rpipe[1]);
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71 cpipeF = fdopen(cpipe[1], "w");
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72 if (!cpipeF) {
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73 perror("fdopen");
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74 exit(1);
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75 }
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76 rpipeF = fdopen(rpipe[0], "r");
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77 if (!rpipeF) {
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78 perror("fdopen");
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79 exit(1);
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80 }
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81 return(0);
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82 }