Mercurial > dovecot > core-2.2

annotate src/lib/mmap-util.c @ 22955:812e5c961328

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fts: Indexing virtual mailbox didn't always index the last mails
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Thu, 03 May 2018 18:33:00 +0300
parents cb108f786fb4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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cb108f786fb4 Updated copyright notices to include the year 2018.
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1 /* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
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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 OFF_T_MAX > SSIZE_T_MAX
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16 if (st.st_size > SSIZE_T_MAX) {
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17 /* too large file to map into memory */
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18 errno = EFBIG;
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19 return MAP_FAILED;
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20 }
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21 #endif
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23 *length = (size_t)st.st_size;
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24 if (*length == 0)
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25 return NULL;
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27 i_assert(*length > 0 && *length < SSIZE_T_MAX);
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29 return mmap(NULL, *length, prot, MAP_SHARED, fd, 0);
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30 }
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32 void *mmap_ro_file(int fd, size_t *length)
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33 {
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34 return mmap_file(fd, length, PROT_READ);
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35 }
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37 void *mmap_rw_file(int fd, size_t *length)
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38 {
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39 return mmap_file(fd, length, PROT_READ | PROT_WRITE);
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40 }
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41
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42 #undef madvise
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43 int my_madvise(void *start ATTR_UNUSED, size_t length ATTR_UNUSED,
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44 int advice ATTR_UNUSED)
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45 {
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46 #ifdef HAVE_MADVISE
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47 /* Ignore ENOSYS errors, which happen if the kernel hasn't implemented
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48 the syscall even if libc has. */
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49 if (madvise(start, length, advice) < 0 && errno != ENOSYS)
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50 return -1;
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51 #endif
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52 return 0;
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53 }
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55 size_t mmap_get_page_size(void)
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56 {
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57 static size_t size = 0;
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59 if (size != 0)
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60 return size;
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61 size = getpagesize();
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62 return size;
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63 }