main.c

   1 /*-------------------------------------------------------------------------
   2  * main.c
   3  *
   4  * Copyright (c) 2016, Teodor Sigaev <teodor@sigaev.ru>
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *        notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *        notice, this list of conditions and the following disclaimer in the
  13  *        documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *-------------------------------------------------------------------------
  27  */
  28
  29 #include <fcntl.h>
  30 #include <stdbool.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <unistd.h>
  35 #include <hidapi/hidapi.h>
  36 #include <sys/param.h>
  37
  38 #include <trinket.h>
  39
  40 static char*    dbdir = NULL;
  41 static int              period = (300); /* in seconds */
  42 static char*    pidfile = NULL;
  43 static char*    logfile = NULL;
  44 static bool             daemonize = false;
  45 static bool             workaround = false;
  46 static char             tfile[MAXPATHLEN],
  47                                 ofile[MAXPATHLEN];
  48
  49 static const double coefficient = (248e-6 / 2637.0);
  50
  51 static void
  52 usage(const char *errmsg) {
  53         puts("trinketd - collecting info from AtomPro");
  54         puts("Copyright (c) 2016, Teodor Sigaev <teodor@sigaev.ru>");
  55         puts("trinketd [-d] [-l logfile] [-p pidfile] [-P period] [-D datadir] [-w]");
  56
  57         if (errmsg) {
  58                 puts("");
  59                 puts(errmsg);
  60         }
  61
  62         exit(1);
  63 }
  64
  65 static void
  66 main_loop() {
  67         double  prevDose,
  68                         curDose;
  69
  70 restart:
  71         prevDose = -1;
  72
  73         if (trinketOpen() != ERR_OK) {
  74                 fprintf(stderr, "trinketOpen fails\n");
  75                 sleep(1);
  76                 goto restart;
  77         }
  78
  79         while(42) {
  80                 if (workaround)
  81                         trinketPing();
  82
  83                 if (trinketGetCumDose(&curDose) != ERR_OK) {
  84                         fprintf(stderr, "trinketGetCumDose fails\n");
  85                         trinketClose();
  86                         sleep(1);
  87                         goto restart;
  88                 }
  89
  90                 if (prevDose >= 0.0) {
  91                         double  counts = curDose - prevDose;
  92                         double  radlevel = 1e6 * coefficient * counts * 3600.0 / (double)period;
  93                         FILE    *fh = stdout;
  94                         bool    successOpen = true;
  95
  96                         if (daemonize) {
  97                                 if ((fh = fopen(tfile, "w")) == NULL) {
  98                                         fprintf(stderr, "fopen fails\n");
  99                                         successOpen = false;
 100                                 }
 101                         }
 102
 103                         if (successOpen) {
 104                                 fprintf(fh, "total: %lld\n", (long long)curDose);
 105                                 fprintf(fh, "counts: %lld\n", (long long)counts);
 106                                 fprintf(fh, "radlevel: %.02f\n", radlevel);
 107                         }
 108
 109                         if (fh && fh != stdout) {
 110                                 fflush(fh);
 111                                 fclose(fh);
 112                                 rename(tfile, ofile);
 113                         }
 114                 }
 115
 116                 prevDose = curDose;
 117                 sleep(period);
 118         }
 119
 120         trinketClose();
 121 }
 122
 123
 124 extern char *optarg;
 125 extern int opterr, optind;
 126
 127 int
 128 main(int argn, char* argv[]) {
 129         int i;
 130         int     pidfd,
 131                 logfd;
 132
 133         opterr = 0;
 134         while((i=getopt(argn,argv,"dD:l:p:P:wh")) != EOF) {
 135                 switch(i) {
 136                         case 'd':
 137                                 daemonize = true;
 138                                 break;
 139                         case 'D':
 140                                 dbdir = strdup(optarg);
 141                                 break;
 142                         case 'l':
 143                                 logfile = strdup(optarg);
 144                                 break;
 145                         case 'p':
 146                                 pidfile = strdup(optarg);
 147                                 break;
 148                         case 'P':
 149                                 period = atoi(optarg);
 150                                 break;
 151                         case 'w':
 152                                 workaround = true;
 153                                 break;
 154                         case 'h':
 155                         default:
 156                                 usage(NULL);
 157                 }
 158         }
 159
 160         if (opterr || optind != argn)
 161                 usage("argument err");
 162
 163         if (period <= 0)
 164                 usage("Collecting period could not be zero nor negative");
 165
 166         if (daemonize && !dbdir)
 167                 usage("trinketd: it is useless to use -d without -D");
 168
 169         if (dbdir && strlen(dbdir) > MAXPATHLEN - 32)
 170                 usage("datadir is too long");
 171
 172         if (pidfile) {
 173                 pidfd = open(pidfile, O_CREAT | O_WRONLY | O_TRUNC, 0666);
 174                 if (pidfd < 0)
 175                         usage("could not write pidfile");
 176         }
 177
 178         if (logfile) {
 179                 logfd = open(logfile, O_CREAT | O_WRONLY | O_APPEND, 0666);
 180                 if (logfd < 0)
 181                         usage("could not write logfile");
 182         }
 183
 184         if (daemonize) {
 185                 if (daemon(0, 0) == -1)
 186                         usage("could not daemonize");
 187         }
 188
 189         if (pidfile) {
 190                 char pid[64];
 191
 192                 snprintf(pid, sizeof(pid), "%lld", (long long)getpid());
 193                 if (write(pidfd, pid, strlen(pid)) != strlen(pid))
 194                         usage("could not write pid");
 195                 close(pidfd);
 196         }
 197
 198         if (logfile) {
 199                 dup2(logfd, fileno(stderr));
 200                 close(logfd);
 201         }
 202
 203         if (hid_init() < 0) {
 204                 fprintf(stderr, "hid_init fails\n");
 205                 exit(1);
 206         }
 207
 208         if (dbdir) {
 209                 snprintf(tfile, MAXPATHLEN, "%s/trinket.tmp", dbdir);
 210                 snprintf(ofile, MAXPATHLEN, "%s/trinket.dat", dbdir);
 211         }
 212
 213         main_loop();
 214
 215         hid_exit();
 216         return 0;
 217 }