Mercurial > dovecot > core-2.2
view src/lib/mmap-util.c @ 19552:0f22db71df7a
global: freshen copyright
git ls-files | xargs perl -p -i -e 's/(\d+)-201[0-5]/$1-2016/g;s/ (201[0-5]) Dovecot/ $1-2016 Dovecot/'
author | Timo Sirainen <timo.sirainen@dovecot.fi> |
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date | Wed, 13 Jan 2016 12:24:03 +0200 |
parents | 3009a1a6f6d5 |
children | ac29347cf81e |
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/* Copyright (c) 2002-2016 Dovecot authors, see the included COPYING file */ #include "lib.h" #include "mmap-util.h" #include <sys/stat.h> void *mmap_file(int fd, size_t *length, int prot) { struct stat st; if (fstat(fd, &st) < 0) return MAP_FAILED; if (st.st_size > SSIZE_T_MAX) { /* too large file to map into memory */ errno = EFBIG; return MAP_FAILED; } *length = (size_t)st.st_size; if (*length == 0) return NULL; i_assert(*length > 0 && *length < SSIZE_T_MAX); return mmap(NULL, *length, prot, 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); } #ifndef HAVE_MADVISE int my_madvise(void *start ATTR_UNUSED, size_t length ATTR_UNUSED, int advice ATTR_UNUSED) { return 0; } #endif size_t mmap_get_page_size(void) { static size_t size = 0; if (size != 0) return size; size = getpagesize(); return size; }