Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib/mmap-util.c @ 5:1b34ec11fff8 HEAD
Message data is parsed in blocks (no longer entirely mmap()ed). Several
IOBuffer changes. All mixed signed/unsigned comparisions were fixed so code
can now be compiled with gcc's -W flag. mbox support is broken currently,
and there's most likely several other problems too.
| author | Timo Sirainen <tss@iki.fi> |
|---|---|
| date | Thu, 22 Aug 2002 01:10:20 +0300 |
| parents | 3b1985cbc908 |
| children | 622e22c0486f |
| 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 | |
| 29 static void *mmap_file(int fd, size_t *length, int access) | |
| 30 { | |
| 31 *length = lseek(fd, 0, SEEK_END); | |
|
5
1b34ec11fff8
Message data is parsed in blocks (no longer entirely mmap()ed). Several
Timo Sirainen <tss@iki.fi>
parents:
0
diff
changeset
|
32 if ((off_t)*length == -1) |
| 0 | 33 return MAP_FAILED; |
| 34 | |
| 35 if (*length == 0) | |
| 36 return NULL; | |
| 37 | |
| 38 i_assert(*length > 0 && *length < INT_MAX); | |
| 39 | |
| 40 return mmap(NULL, *length, access, MAP_SHARED, fd, 0); | |
| 41 } | |
| 42 | |
| 43 void *mmap_ro_file(int fd, size_t *length) | |
| 44 { | |
| 45 return mmap_file(fd, length, PROT_READ); | |
| 46 } | |
| 47 | |
| 48 void *mmap_rw_file(int fd, size_t *length) | |
| 49 { | |
| 50 return mmap_file(fd, length, PROT_READ | PROT_WRITE); | |
| 51 } | |
| 52 | |
| 53 void *mmap_aligned(int fd, int access, off_t offset, size_t length, | |
| 54 void **data_start, size_t *mmap_length) | |
| 55 { | |
| 56 void *mmap_base; | |
| 57 static int pagemask = 0; | |
| 58 | |
| 59 if (pagemask == 0) { | |
|
5
1b34ec11fff8
Message data is parsed in blocks (no longer entirely mmap()ed). Several
Timo Sirainen <tss@iki.fi>
parents:
0
diff
changeset
|
60 pagemask = getpagesize()-1; |
| 0 | 61 i_assert(pagemask > 0); |
| 62 pagemask--; | |
| 63 } | |
| 64 | |
| 65 *mmap_length = length + (offset & pagemask); | |
| 66 | |
| 67 mmap_base = mmap(NULL, *mmap_length, access, MAP_SHARED, | |
| 68 fd, offset & ~pagemask); | |
| 69 *data_start = mmap_base == MAP_FAILED || mmap_base == NULL ? NULL : | |
| 70 (char *) mmap_base + (offset & pagemask); | |
| 71 | |
| 72 return mmap_base; | |
| 73 } | |
| 74 | |
| 75 #ifndef HAVE_MADVISE | |
| 76 int madvise(void *start, size_t length, int advice) | |
| 77 { | |
| 78 } | |
| 79 #endif |