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 int              tics = 1;
  43 static char*    pidfile = NULL;
  44 static char*    logfile = NULL;
  45 static bool             daemonize = 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] [-i tics]");
  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         int             i;
  70         int             collected = 0;
  71
  72         prevDose = malloc(sizeof(*prevDose) * (tics + 1));
  73         if (!prevDose) {
  74                 fprintf(stderr, "could not allocate array, exiting...\n");
  75                 return;
  76         }
  77
  78         while(42) {
  79
  80                 if (trinketOpen() != ERR_OK) {
  81                         fprintf(stderr, "trinketOpen fails\n");
  82                         sleep(1);
  83                         continue;
  84                 }
  85
  86                 if (trinketGetCumDose(&curDose) != ERR_OK) {
  87                         fprintf(stderr, "trinketGetCumDose fails\n");
  88                         trinketClose();
  89                         sleep(1);
  90                         continue;
  91                 }
  92
  93                 trinketClose();
  94
  95                 if (collected <= tics) {
  96                         prevDose[collected++] = curDose;
  97                 } else {
  98                         for (i=1; i<=tics; i++)
  99                                 prevDose[i - 1] = prevDose[i];
 100                         prevDose[tics] = curDose;
 101                 }
 102
 103                 if (collected > 1) {
 104                         double  counts = curDose - prevDose[0];
 105                         double  radlevel = 1e6 * coefficient * counts * 3600.0 /
 106                                                                 (double)(period * (collected - 1));
 107                         FILE    *fh = stdout;
 108                         bool    successOpen = true;
 109
 110                         if (daemonize) {
 111                                 if ((fh = fopen(tfile, "w")) == NULL) {
 112                                         fprintf(stderr, "fopen fails\n");
 113                                         successOpen = false;
 114                                 }
 115                         }
 116
 117                         if (successOpen) {
 118                                 fprintf(fh, "total: %lld\n", (long long)curDose);
 119                                 fprintf(fh, "counts: %lld\n", (long long)counts);
 120                                 fprintf(fh, "tics: %d\n", collected - 1);
 121                                 fprintf(fh, "radlevel: %.02f\n", radlevel);
 122                         }
 123
 124                         if (fh && fh != stdout) {
 125                                 fflush(fh);
 126                                 fclose(fh);
 127                                 rename(tfile, ofile);
 128                         }
 129                 }
 130
 131                 sleep(period);
 132         }
 133 }
 134
 135
 136 extern char *optarg;
 137 extern int opterr, optind;
 138
 139 int
 140 main(int argn, char* argv[]) {
 141         int i;
 142         int     pidfd,
 143                 logfd;
 144
 145         opterr = 0;
 146         while((i=getopt(argn,argv,"dD:i:l:p:P:h")) != EOF) {
 147                 switch(i) {
 148                         case 'd':
 149                                 daemonize = true;
 150                                 break;
 151                         case 'D':
 152                                 dbdir = strdup(optarg);
 153                                 break;
 154                         case 'i':
 155                                 tics = atoi(optarg);
 156                                 break;
 157                         case 'l':
 158                                 logfile = strdup(optarg);
 159                                 break;
 160                         case 'p':
 161                                 pidfile = strdup(optarg);
 162                                 break;
 163                         case 'P':
 164                                 period = atoi(optarg);
 165                                 break;
 166                         case 'h':
 167                         default:
 168                                 usage(NULL);
 169                 }
 170         }
 171
 172         if (opterr || optind != argn)
 173                 usage("argument err");
 174
 175         if (period <= 0)
 176                 usage("Collecting period could not be zero nor negative");
 177
 178         if (tics <= 0)
 179                 usage("Number of tics could not be zero nor negative");
 180
 181         if (daemonize && !dbdir)
 182                 usage("trinketd: it is useless to use -d without -D");
 183
 184         if (dbdir && strlen(dbdir) > MAXPATHLEN - 32)
 185                 usage("datadir is too long");
 186
 187         if (pidfile) {
 188                 pidfd = open(pidfile, O_CREAT | O_WRONLY | O_TRUNC, 0666);
 189                 if (pidfd < 0)
 190                         usage("could not write pidfile");
 191         }
 192
 193         if (logfile) {
 194                 logfd = open(logfile, O_CREAT | O_WRONLY | O_APPEND, 0666);
 195                 if (logfd < 0)
 196                         usage("could not write logfile");
 197         }
 198
 199         if (daemonize) {
 200                 if (daemon(0, 0) == -1)
 201                         usage("could not daemonize");
 202         }
 203
 204         if (pidfile) {
 205                 char pid[64];
 206
 207                 snprintf(pid, sizeof(pid), "%lld", (long long)getpid());
 208                 if (write(pidfd, pid, strlen(pid)) != strlen(pid))
 209                         usage("could not write pid");
 210                 close(pidfd);
 211         }
 212
 213         if (logfile) {
 214                 dup2(logfd, fileno(stderr));
 215                 close(logfd);
 216         }
 217
 218         if (hid_init() < 0) {
 219                 fprintf(stderr, "hid_init fails\n");
 220                 exit(1);
 221         }
 222
 223         if (dbdir) {
 224                 snprintf(tfile, MAXPATHLEN, "%s/trinket.tmp", dbdir);
 225                 snprintf(ofile, MAXPATHLEN, "%s/trinket.dat", dbdir);
 226         }
 227
 228         main_loop();
 229
 230         hid_exit();
 231         return 0;
 232 }