ref: 6e3c1a2fa29c066f7d1a25037a1f61cd295ac3af
dir: /src/utils/cst_mmap_posix.c/
/*************************************************************************/
/* */
/* Cepstral, LLC */
/* Copyright (c) 2001 */
/* All Rights Reserved. */
/* */
/* Permission is hereby granted, free of charge, to use and distribute */
/* this software and its documentation without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of this work, and to */
/* permit persons to whom this work is furnished to do so, subject to */
/* the following conditions: */
/* 1. The code must retain the above copyright notice, this list of */
/* conditions and the following disclaimer. */
/* 2. Any modifications must be clearly marked as such. */
/* 3. Original authors' names are not deleted. */
/* 4. The authors' names are not used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* CEPSTRAL, LLC AND THE CONTRIBUTORS TO THIS WORK DISCLAIM ALL */
/* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED */
/* WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL */
/* CEPSTRAL, LLC NOR THE CONTRIBUTORS BE LIABLE FOR ANY SPECIAL, */
/* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER */
/* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION */
/* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR */
/* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
/* */
/*************************************************************************/
/* Author: David Huggins-Daines (dhd@cepstral.com) */
/* Date: October 2001 */
/*************************************************************************/
/* */
/* cst_mmap_posix.c: memory-mapped file I/O support for POSIX systems */
/* */
/*************************************************************************/
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "cst_file.h"
#include "cst_error.h"
#include "cst_alloc.h"
#ifdef __QNXNTO__
#include <sys/syspage.h>
#define getpagesize() (SYSPAGE_ENTRY( system_private )->PAGE_SIZE)
// #define getpagesize() (sysconf(_SC_PAGESIZE))
#else
#define MAP_NOSYNCFILE 0
#endif
// #define __page_size PAGE_SIZE
cst_filemap *cst_mmap_file(const char *path)
{
cst_filemap *fmap = NULL;
size_t pgsize;
struct stat buf;
int fd;
// unsigned int __page_size = PAGE_SIZE;
pgsize = getpagesize();
// pgsize = PAGE_SIZE;
if ((fd = open(path, O_RDONLY)) < 0) {
perror("cst_mmap_file: Failed to open file");
return NULL;
}
if ((fstat(fd, &buf)) < 0) {
perror("cst_mmap_file: fstat() failed");
return NULL;
}
fmap = cst_alloc(cst_filemap, 1);
fmap->fd = fd;
fmap->mapsize = (buf.st_size + pgsize - 1) / pgsize * pgsize;
if ((fmap->mem = mmap(0, fmap->mapsize, PROT_READ,
MAP_SHARED | MAP_NOSYNCFILE, fd, 0)) == (caddr_t)-1) {
perror("cst_mmap_file: mmap() failed");
cst_free(fmap);
return NULL;
}
return fmap;
}
int cst_munmap_file(cst_filemap *fmap)
{
if (munmap(fmap->mem, fmap->mapsize) < 0) {
perror("cst_munmap_file: munmap() failed");
return -1;
}
if (close(fmap->fd) < 0) {
perror("cst_munmap_file: close() failed");
return -1;
}
cst_free(fmap);
return 0;
}
cst_filemap *cst_read_whole_file(const char *path)
{
cst_filemap *fmap;
struct stat buf;
int fd;
if ((fd = open(path, O_RDONLY)) < 0) {
perror("cst_read_whole_file: Failed to open file");
return NULL;
}
if ((fstat(fd, &buf)) < 0) {
perror("cst_read_whole_file: fstat() failed");
return NULL;
}
fmap = cst_alloc(cst_filemap, 1);
fmap->fd = fd;
fmap->mapsize = buf.st_size;
fmap->mem = cst_alloc(char, fmap->mapsize);
if ((int)read(fmap->fd, fmap->mem, fmap->mapsize) < (int)fmap->mapsize)
{
perror("cst_read_whole_file: read() failed");
close(fmap->fd);
cst_free(fmap->mem);
cst_free(fmap);
return NULL;
}
return fmap;
}
int cst_free_whole_file(cst_filemap *fmap)
{
if (close(fmap->fd) < 0) {
perror("cst_free_whole_file: close() failed");
return -1;
}
cst_free(fmap->mem);
cst_free(fmap);
return 0;
}
cst_filemap *cst_read_part_file(const char *path)
{
cst_filemap *fmap;
struct stat buf;
cst_file fh;
if ((fh = cst_fopen(path, CST_OPEN_READ)) == NULL) {
perror("cst_read_part_file: Failed to open file");
return NULL;
}
if ((fstat(fileno(fh), &buf)) < 0) {
perror("cst_read_part_file: fstat() failed");
return NULL;
}
fmap = cst_alloc(cst_filemap, 1);
fmap->fh = fh;
fmap->mapsize = buf.st_size;
return fmap;
}
int cst_free_part_file(cst_filemap *fmap)
{
if (cst_fclose(fmap->fh) < 0) {
perror("cst_munmap_file: cst_fclose() failed");
return -1;
}
cst_free(fmap);
return 0;
}