Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib/mmap-util.c @ 1000:0fbafade2d85 HEAD
If auth/login process died unexpectedly, the exit status or killing signal
wasn't logged.
| author | Timo Sirainen <tss@iki.fi> |
|---|---|
| date | Tue, 21 Jan 2003 09:58:49 +0200 |
| parents | 52fd3d82e59a |
| children | be6749ad05ad |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 mmap-util.c - Memory mapping utilities | |
| 3 | |
| 4 Copyright (c) 2002 Timo Sirainen | |
| 5 | |
| 6 Permission is hereby granted, free of charge, to any person obtaining | |
| 7 a copy of this software and associated documentation files (the | |
| 8 "Software"), to deal in the Software without restriction, including | |
| 9 without limitation the rights to use, copy, modify, merge, publish, | |
| 10 distribute, sublicense, and/or sell copies of the Software, and to | |
| 11 permit persons to whom the Software is furnished to do so, subject to | |
| 12 the following conditions: | |
| 13 | |
| 14 The above copyright notice and this permission notice shall be | |
| 15 included in all copies or substantial portions of the Software. | |
| 16 | |
| 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
| 18 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
| 19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
| 20 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | |
| 21 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
| 22 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
| 23 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| 24 */ | |
| 25 | |
| 26 #include "lib.h" | |
| 27 #include "mmap-util.h" | |
| 28 | |
|
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29 #include <sys/stat.h> |
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30 |
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31 void *mmap_file(int fd, size_t *length, int prot) |
| 0 | 32 { |
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33 struct stat st; |
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34 |
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35 if (fstat(fd, &st) < 0) |
| 0 | 36 return MAP_FAILED; |
| 37 | |
|
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38 if (st.st_size > SSIZE_T_MAX) { |
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39 /* too large file to map into memory */ |
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40 errno = EFBIG; |
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41 return MAP_FAILED; |
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42 } |
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43 |
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44 *length = (size_t)st.st_size; |
| 0 | 45 if (*length == 0) |
| 46 return NULL; | |
| 47 | |
|
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48 i_assert(*length > 0 && *length < SSIZE_T_MAX); |
| 0 | 49 |
|
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50 return mmap(NULL, *length, prot, MAP_SHARED, fd, 0); |
| 0 | 51 } |
| 52 | |
| 53 void *mmap_ro_file(int fd, size_t *length) | |
| 54 { | |
| 55 return mmap_file(fd, length, PROT_READ); | |
| 56 } | |
| 57 | |
| 58 void *mmap_rw_file(int fd, size_t *length) | |
| 59 { | |
| 60 return mmap_file(fd, length, PROT_READ | PROT_WRITE); | |
| 61 } | |
| 62 | |
| 63 #ifndef HAVE_MADVISE | |
| 64 int madvise(void *start, size_t length, int advice) | |
| 65 { | |
| 66 } | |
| 67 #endif |