+/******************************************************************************/
+/* pfixtools: a collection of postfix related tools */
+/* ~~~~~~~~~ */
+/* ________________________________________________________________________ */
+/* */
+/* Redistribution and use in source and binary forms, with or without */
+/* modification, are permitted provided that the following conditions */
+/* are met: */
+/* */
+/* 1. Redistributions of source code must retain the above copyright */
+/* notice, this list of conditions and the following disclaimer. */
+/* 2. Redistributions in binary form must reproduce the above copyright */
+/* notice, this list of conditions and the following disclaimer in the */
+/* documentation and/or other materials provided with the distribution. */
+/* 3. The names of its contributors may not be used to endorse or promote */
+/* products derived from this software without specific prior written */
+/* permission. */
+/* */
+/* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */
+/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */
+/* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
+/* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */
+/* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */
+/* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */
+/* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */
+/* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
+/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */
+/* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */
+/* THE POSSIBILITY OF SUCH DAMAGE. */
+/******************************************************************************/
+
+/*
+ * Copyright © 2008 Florent Bruneau
+ */
+
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include "file.h"
+
+file_map_t *file_map_new(const char *file, bool memlock)
+{
+ file_map_t *map = p_new(file_map_t, 1);
+ if (!file_map_open(map, file, memlock)) {
+ p_delete(&map);
+ return NULL;
+ }
+ return map;
+}
+
+void file_map_delete(file_map_t **map)
+{
+ if (*map) {
+ file_map_close(*map);
+ p_delete(map);
+ }
+}
+
+bool file_map_open(file_map_t *map, const char *file, bool memlock)
+{
+ struct stat st;
+ int fd;
+
+ fd = open(file, O_RDONLY, 0000);
+ if (fd < 0) {
+ UNIXERR("open");
+ return false;
+ }
+
+ if (fstat(fd, &st) < 0) {
+ UNIXERR("fstat");
+ close(fd);
+ return false;
+ }
+
+ map->map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (map->map == MAP_FAILED) {
+ UNIXERR("mmap");
+ close(fd);
+ map->map = NULL;
+ return false;
+ }
+ close(fd);
+
+ map->end = map->map + st.st_size;
+ map->locked = memlock && mlock(map->map, st.st_size) == 0;
+ return true;
+}
+
+void file_map_close(file_map_t *map)
+{
+ if (!map->map) {
+ return;
+ }
+ if (map->locked) {
+ munlock(map->map, map->end - map->map);
+ }
+ munmap((void*)map->map, map->end - map->map);
+ map->map = NULL;
+ map->end = NULL;
+ map->locked = false;
+}