/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1997-2016. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* Defines the interfaces between the generic efile driver and its
* operating-system dependent helpers.
*/
#include "sys.h"
#include "erl_driver.h"
/*
* Open modes for efile_openfile().
*/
#define EFILE_MODE_READ 1
#define EFILE_MODE_WRITE 2 /* Implies truncating file when used alone. */
#define EFILE_MODE_READ_WRITE 3
#define EFILE_MODE_APPEND 4
#define EFILE_COMPRESSED 8
#define EFILE_MODE_EXCL 16
#define EFILE_NO_TRUNCATE 32 /* Special for reopening on VxWorks */
#define EFILE_MODE_SYNC 64
/*
* Seek modes for efile_seek().
*/
#define EFILE_SEEK_SET 0
#define EFILE_SEEK_CUR 1
#define EFILE_SEEK_END 2
/*
* File types returned by efile_fileinfo().
*/
#define FT_DEVICE 1
#define FT_DIRECTORY 2
#define FT_REGULAR 3
#define FT_SYMLINK 4
#define FT_OTHER 5
/*
* Access attributes returned by efile_fileinfo() (the bits can be ORed
* together).
*/
#define FA_NONE 0
#define FA_WRITE 1
#define FA_READ 2
/* Some OS'es (i.e. Windows) has filenames in wide charaqcters. That requires special handling */
/* Note that we do *not* honor alignment in the communication to the OS specific driver, */
/* which is not a problem on x86, but might be on other platforms. The OS specific efile */
/* implementation is expected to align if needed */
#ifdef __WIN32__
#define FILENAMES_16BIT 1
#endif
/* We use sendfilev if it exist on solaris */
#if !defined(HAVE_SENDFILE) && defined(HAVE_SENDFILEV)
#define HAVE_SENDFILE
#endif
/*
* An handle to an open directory. To be cast to the correct type
* in the system-dependent directory functions.
*/
typedef struct _Efile_Dir_Handle* EFILE_DIR_HANDLE;
/*
* Error information from the last call.
*/
typedef struct _Efile_error {
int posix_errno; /* Posix error number, as in <errno.h>. */
int os_errno; /* Os-dependent error number (not used). */
} Efile_error;
/*
* Describes what is returned by file:file_info/1.
*/
typedef struct _Efile_info {
Uint32 size_low; /* Size of file, lower 32 bits.. */
Uint32 size_high; /* Size of file, higher 32 bits. */
Uint32 type; /* Type of file -- one of FT_*. */
Uint32 access; /* Access to file -- one of FA_*. */
Uint32 mode; /* Access permissions -- bit field. */
Uint32 links; /* Number of links to file. */
Uint32 major_device; /* Major device or file system. */
Uint32 minor_device; /* Minor device (for devices). */
Uint32 inode; /* Inode number. */
Uint32 uid; /* User id of owner. */
Uint32 gid; /* Group id of owner. */
time_t accessTime; /* Last time the file was accessed. */
time_t modifyTime; /* Last time the file was modified. */
time_t cTime; /* Creation time (Windows) or last
* inode change (Unix).
*/
} Efile_info;
#ifdef HAVE_SENDFILE
/*
* Describes the structure of headers/trailers for sendfile
*/
struct t_sendfile_hdtl {
SysIOVec *headers;
int hdr_cnt;
SysIOVec *trailers;
int trl_cnt;
};
#endif /* HAVE_SENDFILE */
/*
* Functions.
*/
int efile_init(void);
int efile_mkdir(Efile_error* errInfo, char* name);
int efile_rmdir(Efile_error* errInfo, char* name);
int efile_delete_file(Efile_error* errInfo, char* name);
int efile_rename(Efile_error* errInfo, char* src, char* dst);
int efile_chdir(Efile_error* errInfo, char* name);
int efile_getdcwd(Efile_error* errInfo, int drive,
char* buffer, size_t size);
int efile_readdir(Efile_error* errInfo, char* name,
EFILE_DIR_HANDLE* dir_handle,
char* buffer, size_t *size);
int efile_openfile(Efile_error* errInfo, char* name, int flags,
int* pfd, Sint64* pSize);
void efile_closefile(int fd);
int efile_fdatasync(Efile_error* errInfo, int fd);
int efile_fsync(Efile_error* errInfo, int fd);
int efile_fileinfo(Efile_error* errInfo, Efile_info* pInfo,
char *name, int info_for_link);
int efile_write_info(Efile_error* errInfo, Efile_info* pInfo, char *name);
int efile_write(Efile_error* errInfo, int flags, int fd,
char* buf, size_t count);
int efile_writev(Efile_error* errInfo, int flags, int fd,
SysIOVec* iov, int iovcnt);
int efile_read(Efile_error* errInfo, int flags, int fd,
char* buf, size_t count, size_t* pBytesRead);
int efile_seek(Efile_error* errInfo, int fd,
Sint64 offset, int origin, Sint64* new_location);
int efile_truncate_file(Efile_error* errInfo, int *fd, int flags);
int efile_pwrite(Efile_error* errInfo, int fd,
char* buf, size_t count, Sint64 offset);
int efile_pread(Efile_error* errInfo, int fd,
Sint64 offset, char* buf, size_t count, size_t* pBytesRead);
int efile_readlink(Efile_error* errInfo, char *name,
char* buffer, size_t size);
int efile_altname(Efile_error* errInfo, char *name,
char* buffer, size_t size);
int efile_link(Efile_error* errInfo, char* old, char* new);
int efile_symlink(Efile_error* errInfo, char* old, char* new);
int efile_may_openfile(Efile_error* errInfo, char *name);
int efile_fadvise(Efile_error* errInfo, int fd, Sint64 offset, Sint64 length,
int advise);
#ifdef HAVE_SENDFILE
int efile_sendfile(Efile_error* errInfo, int in_fd, int out_fd,
off_t *offset, Uint64 *nbytes, struct t_sendfile_hdtl *hdtl);
#endif /* HAVE_SENDFILE */
int efile_fallocate(Efile_error* errInfo, int fd, Sint64 offset, Sint64 length);
