Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/mmap-util.c @ 6411:6a64e64fa3a3 HEAD

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Renamed __attr_*__ to ATTR_*. Renamed __attrs_used__ to ATTRS_DEFINED.
author Timo Sirainen <tss@iki.fi>
date Sun, 16 Sep 2007 11:40:56 +0300
parents 7e1fdbdaf465
children 65c69a53a7be
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9df02b1533b3 Removed most of the license comments from src/lib/*.c. It's just fine to
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1 /* Copyright (c) 2002-2003 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "mmap-util.h"
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5
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6 #include <sys/stat.h>
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7
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8 void *mmap_file(int fd, size_t *length, int prot)
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9 {
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10 struct stat st;
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12 if (fstat(fd, &st) < 0)
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13 return MAP_FAILED;
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15 if (st.st_size > SSIZE_T_MAX) {
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16 /* too large file to map into memory */
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17 errno = EFBIG;
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18 return MAP_FAILED;
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19 }
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20
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21 *length = (size_t)st.st_size;
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22 if (*length == 0)
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23 return NULL;
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25 i_assert(*length > 0 && *length < SSIZE_T_MAX);
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27 return mmap(NULL, *length, prot, MAP_SHARED, fd, 0);
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28 }
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30 void *mmap_ro_file(int fd, size_t *length)
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31 {
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32 return mmap_file(fd, length, PROT_READ);
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33 }
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34
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35 void *mmap_rw_file(int fd, size_t *length)
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36 {
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37 return mmap_file(fd, length, PROT_READ | PROT_WRITE);
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38 }
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39
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40 #ifndef HAVE_MADVISE
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41 int my_madvise(void *start ATTR_UNUSED, size_t length ATTR_UNUSED,
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42 int advice ATTR_UNUSED)
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43 {
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44 return 0;
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45 }
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46 #endif
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47
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48 size_t mmap_get_page_size(void)
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49 {
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50 static size_t size = 0;
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51
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52 if (size != 0)
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53 return size;
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54 size = getpagesize();
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55 return size;
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56 }