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 bool             workaround = false;
  47 static char             tfile[MAXPATHLEN],
  48                                 ofile[MAXPATHLEN];
  49
  50 static const double coefficient = (248e-6 / 2637.0);
  51
  52 static void
  53 usage(const char *errmsg) {
  54         puts("trinketd - collecting info from AtomPro");
  55         puts("Copyright (c) 2016, Teodor Sigaev <teodor@sigaev.ru>");
  56         puts("trinketd [-d] [-l logfile] [-p pidfile] [-P period] [-D datadir] [-i tics] [-w]");
  57
  58         if (errmsg) {
  59                 puts("");
  60                 puts(errmsg);
  61         }
  62
  63         exit(1);
  64 }
  65
  66 static void
  67 main_loop() {
  68         double  *prevDose,
  69                         curDose;
  70         int             i;
  71         int             collected;
  72
  73         prevDose = malloc(sizeof(*prevDose) * (tics + 1));
  74         if (!prevDose) {
  75                 fprintf(stderr, "could not allocate array, exiting...\n");
  76                 return;
  77         }
  78
  79 restart:
  80         collected = 0;
  81
  82         if (trinketOpen() != ERR_OK) {
  83                 fprintf(stderr, "trinketOpen fails\n");
  84                 sleep(1);
  85                 goto restart;
  86         }
  87
  88         while(42) {
  89
  90                 if (workaround)
  91                         trinketPing();
  92
  93                 if (trinketGetCumDose(&curDose) != ERR_OK) {
  94                         fprintf(stderr, "trinketGetCumDose fails\n");
  95                         trinketClose();
  96                         sleep(1);
  97                         goto restart;
  98                 }
  99
 100                 if (collected <= tics) {
 101                         prevDose[collected++] = curDose;
 102                 } else {
 103                         for (i=1; i<=tics; i++)
 104                                 prevDose[i - 1] = prevDose[i];
 105                         prevDose[tics] = curDose;
 106                 }
 107
 108                 if (collected > 1) {
 109                         double  counts = curDose - prevDose[0];
 110                         double  radlevel = 1e6 * coefficient * counts * 3600.0 /
 111                                                                 (double)(period * (collected - 1));
 112                         FILE    *fh = stdout;
 113                         bool    successOpen = true;
 114
 115                         if (daemonize) {
 116                                 if ((fh = fopen(tfile, "w")) == NULL) {
 117                                         fprintf(stderr, "fopen fails\n");
 118                                         successOpen = false;
 119                                 }
 120                         }
 121
 122                         if (successOpen) {
 123                                 fprintf(fh, "total: %lld\n", (long long)curDose);
 124                                 fprintf(fh, "counts: %lld\n", (long long)counts);
 125                                 fprintf(fh, "tics: %d\n", collected - 1);
 126                                 fprintf(fh, "radlevel: %.02f\n", radlevel);
 127                         }
 128
 129                         if (fh && fh != stdout) {
 130                                 fflush(fh);
 131                                 fclose(fh);
 132                                 rename(tfile, ofile);
 133                         }
 134                 }
 135
 136                 sleep(period);
 137         }
 138
 139         trinketClose();
 140 }
 141
 142
 143 extern char *optarg;
 144 extern int opterr, optind;
 145
 146 int
 147 main(int argn, char* argv[]) {
 148         int i;
 149         int     pidfd,
 150                 logfd;
 151
 152         opterr = 0;
 153         while((i=getopt(argn,argv,"dD:i:l:p:P:wh")) != EOF) {
 154                 switch(i) {
 155                         case 'd':
 156                                 daemonize = true;
 157                                 break;
 158                         case 'D':
 159                                 dbdir = strdup(optarg);
 160                                 break;
 161                         case 'i':
 162                                 tics = atoi(optarg);
 163                                 break;
 164                         case 'l':
 165                                 logfile = strdup(optarg);
 166                                 break;
 167                         case 'p':
 168                                 pidfile = strdup(optarg);
 169                                 break;
 170                         case 'P':
 171                                 period = atoi(optarg);
 172                                 break;
 173                         case 'w':
 174                                 workaround = true;
 175                                 break;
 176                         case 'h':
 177                         default:
 178                                 usage(NULL);
 179                 }
 180         }
 181
 182         if (opterr || optind != argn)
 183                 usage("argument err");
 184
 185         if (period <= 0)
 186                 usage("Collecting period could not be zero nor negative");
 187
 188         if (tics <= 0)
 189                 usage("Number of tics could not be zero nor negative");
 190
 191         if (daemonize && !dbdir)
 192                 usage("trinketd: it is useless to use -d without -D");
 193
 194         if (dbdir && strlen(dbdir) > MAXPATHLEN - 32)
 195                 usage("datadir is too long");
 196
 197         if (pidfile) {
 198                 pidfd = open(pidfile, O_CREAT | O_WRONLY | O_TRUNC, 0666);
 199                 if (pidfd < 0)
 200                         usage("could not write pidfile");
 201         }
 202
 203         if (logfile) {
 204                 logfd = open(logfile, O_CREAT | O_WRONLY | O_APPEND, 0666);
 205                 if (logfd < 0)
 206                         usage("could not write logfile");
 207         }
 208
 209         if (daemonize) {
 210                 if (daemon(0, 0) == -1)
 211                         usage("could not daemonize");
 212         }
 213
 214         if (pidfile) {
 215                 char pid[64];
 216
 217                 snprintf(pid, sizeof(pid), "%lld", (long long)getpid());
 218                 if (write(pidfd, pid, strlen(pid)) != strlen(pid))
 219                         usage("could not write pid");
 220                 close(pidfd);
 221         }
 222
 223         if (logfile) {
 224                 dup2(logfd, fileno(stderr));
 225                 close(logfd);
 226         }
 227
 228         if (hid_init() < 0) {
 229                 fprintf(stderr, "hid_init fails\n");
 230                 exit(1);
 231         }
 232
 233         if (dbdir) {
 234                 snprintf(tfile, MAXPATHLEN, "%s/trinket.tmp", dbdir);
 235                 snprintf(ofile, MAXPATHLEN, "%s/trinket.dat", dbdir);
 236         }
 237
 238         main_loop();
 239
 240         hid_exit();
 241         return 0;
 242 }