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/* mmapを抽象化する
*
* *Unix系のシステムコールをソース中に散らさないため
* *将来的には一つのファイルを複数の目的にmapすることも考慮
*
* Copyright (C) 2005 TABATA Yusuke
*
*/
/*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <anthy/filemap.h>
#include <anthy/logger.h>
struct filemapping {
/* 書き込みモード */
int wr;
/* mmapしたアドレス */
void *ptr;
/* mmapした領域の長さ */
size_t size;
};
struct filemapping *
anthy_mmap(const char *fn, int wr)
{
int fd;
void *ptr;
int r;
struct filemapping *m;
struct stat st;
int prot;
int flags;
mode_t mode;
if (wr) {
prot = PROT_READ | PROT_WRITE;
flags = O_RDWR;
mode = S_IRUSR | S_IWUSR;
} else {
prot = PROT_READ;
flags = O_RDONLY;
mode = S_IRUSR;
}
fd = open(fn, flags, mode);
if (fd == -1) {
anthy_log(0, "Failed to open (%s).\n", fn);
return NULL;
}
r = fstat(fd, &st);
if (r == -1) {
anthy_log(0, "Failed to stat() (%s).\n", fn);
close(fd);
return NULL;
}
if (st.st_size == 0) {
anthy_log(0, "Failed to mmap 0size file (%s).\n", fn);
close(fd);
return NULL;
}
ptr = mmap(NULL, st.st_size, prot, MAP_SHARED, fd, 0);
close(fd);
if (ptr == MAP_FAILED) {
anthy_log(0, "Failed to mmap() (%s).\n", fn);
return NULL;
}
/* mmapに成功したので情報を返す */
m = malloc(sizeof(struct filemapping));
m->size = st.st_size;
m->ptr = ptr;
m->wr = wr;
return m;
}
void *
anthy_mmap_address(struct filemapping *m)
{
if (!m) {
return NULL;
}
return m->ptr;
}
int
anthy_mmap_size(struct filemapping *m)
{
if (!m) {
return 0;
}
return m->size;
}
int
anthy_mmap_is_writable(struct filemapping *m)
{
if (!m) {
return 0;
}
return m->wr;
}
void
anthy_munmap(struct filemapping *m)
{
if (!m) {
return ;
}
munmap(m->ptr, m->size);
free(m);
}
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