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annotate ffstools/tiaud/mkvol.c @ 407:19e5a3e2f9c0

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fcup-settime: moved time() retrieval a little closer to the output A fundamental problem with all simple time transfer tools is that there is always some delay between the time retrieval on the source system and that transmitted time being set on the destination, and the resulting time on the destination system is off by that delay amount. This delay cannot be fully eliminated when working in a simple environment like ours, but we should make our best effort to minimize it. In the present case, moving the atinterf_init() call before the time() retrieval should make a teensy-tiny improvement.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Aug 2018 21:52:17 +0000
parents 1f3b28d66d53
children
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1f3b28d66d53 tiaud-mkvol program written
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1 /*
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2 * This program generates an audio volume file for uploading into Calypso
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3 * device FFS; TI's Audio Service requires every *.cfg file to be accompanied
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4 * by a corresponding *.vol file.
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5 */
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6
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7 #include <sys/types.h>
1f3b28d66d53 tiaud-mkvol program written
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8 #include <sys/file.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12
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13 u_char bin[4];
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14
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15 write_bin_output(filename)
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16 char *filename;
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17 {
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18 int fd;
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19
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20 fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0666);
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21 if (fd < 0) {
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22 perror(filename);
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23 exit(1);
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24 }
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25 write(fd, &bin, sizeof bin);
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26 close(fd);
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27 }
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28
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29 main(argc, argv)
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30 char **argv;
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31 {
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32 if (argc != 3) {
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33 fprintf(stderr, "usage: %s volume outfile\n", argv[0]);
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34 exit(1);
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35 }
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36 bin[0] = atoi(argv[1]);
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37 write_bin_output(argv[2]);
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38 exit(0);
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39 }