Mercurial > archived > louis > perso > liblxcstats

annotate tests/read_big_file.c @ 0:6ce4443e7545

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Add the draft of an API to collect statistics on LXC
author Louis Opter <kalessin@kalessin.fr>
date Wed, 29 Dec 2010 23:28:14 +0100
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6ce4443e7545 Add the draft of an API to collect statistics on LXC
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1 #include <sys/types.h>
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2 #include <sys/mman.h>
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3 #include <sys/stat.h>
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4
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5 #include <err.h>
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6 #include <fcntl.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <unistd.h>
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10
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11 #include "lxcstats.h"
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12 #include "_lxcstats.h"
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13
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14 int
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15 main(void)
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16 {
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17 char *reference;
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18 struct stat sb;
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19 char *trial;
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20 size_t size;
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21 int fd;
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22
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23 fd = open("/etc/services", O_RDONLY);
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24 if (fd == -1)
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25 err(EXIT_FAILURE, "can't open /etc/services");
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26
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27 size = _lxcst_read_file("/etc/services", &trial);
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28 if (!trial)
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29 err(EXIT_FAILURE, "can't read /etc/services");
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30
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31 if (fstat(fd, &sb) != 0)
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32 err(EXIT_FAILURE, "can't stat /etc/services");
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33
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34 reference = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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35 if (!reference)
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36 err(EXIT_FAILURE, "can't map /etc/services");
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37
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38 if ((size_t)sb.st_size != size)
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39 errx(EXIT_FAILURE, "sizes are different");
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40
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41 if (memcmp(reference, trial, size))
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42 errx(EXIT_FAILURE, "buffers are different");
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43
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44 free(trial);
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45
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46 return (EXIT_SUCCESS);
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47 }