Mercurial > dovecot > original-hg > dovecot-1.2
view 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 |
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/* mmap-util.c - Memory mapping utilities Copyright (c) 2002 Timo Sirainen Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "lib.h" #include "mmap-util.h" static void *mmap_file(int fd, size_t *length, int access) { *length = lseek(fd, 0, SEEK_END); if ((off_t)*length == -1) return MAP_FAILED; if (*length == 0) return NULL; i_assert(*length > 0 && *length < INT_MAX); return mmap(NULL, *length, access, MAP_SHARED, fd, 0); } void *mmap_ro_file(int fd, size_t *length) { return mmap_file(fd, length, PROT_READ); } void *mmap_rw_file(int fd, size_t *length) { return mmap_file(fd, length, PROT_READ | PROT_WRITE); } void *mmap_aligned(int fd, int access, off_t offset, size_t length, void **data_start, size_t *mmap_length) { void *mmap_base; static int pagemask = 0; if (pagemask == 0) { pagemask = getpagesize()-1; i_assert(pagemask > 0); pagemask--; } *mmap_length = length + (offset & pagemask); mmap_base = mmap(NULL, *mmap_length, access, MAP_SHARED, fd, offset & ~pagemask); *data_start = mmap_base == MAP_FAILED || mmap_base == NULL ? NULL : (char *) mmap_base + (offset & pagemask); return mmap_base; } #ifndef HAVE_MADVISE int madvise(void *start, size_t length, int advice) { } #endif