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/*-------------------------------------------------------------------------
*
* fd.h--
* Virtual file descriptor definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: fd.h,v 1.1.1.1 1996/07/09 06:21:52 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
/*
* calls:
*
* File {Close, Read, Write, Seek, Tell, Sync}
* {File Name Open, Allocate, Free} File
*
* These are NOT JUST RENAMINGS OF THE UNIX ROUTINES.
* use them for all file activity...
*
* fd = FilePathOpenFile("foo", O_RDONLY);
* File fd;
*
* use AllocateFile if you need a file descriptor in some other context.
* it will make sure that there is a file descriptor free
*
* use FreeFile to let the virtual file descriptor package know that
* there is now a free fd (when you are done with it)
*
* AllocateFile();
* FreeFile();
*/
#ifndef FD_H
#define FD_H
/*
* FileOpen uses the standard UNIX open(2) flags.
*/
#include <fcntl.h> /* for O_ on most */
#ifndef O_RDONLY
#include <sys/file.h> /* for O_ on the rest */
#endif /* O_RDONLY */
/*
* FileSeek uses the standard UNIX lseek(2) flags.
*/
#ifndef WIN32
#include <unistd.h> /* for SEEK_ on most */
#else
#ifndef SEEK_SET
#include <stdio.h> /* for SEEK_ on the rest */
#endif /* SEEK_SET */
#endif /* WIN32 */
#include "c.h"
#include "storage/block.h"
typedef char *FileName;
typedef int File;
/* originally in libpq-fs.h */
struct pgstat { /* just the fields we need from stat structure */
int st_ino;
int st_mode;
unsigned int st_size;
unsigned int st_sizehigh; /* high order bits */
/* 2^64 == 1.8 x 10^20 bytes */
int st_uid;
int st_atime_s; /* just the seconds */
int st_mtime_s; /* since SysV and the new BSD both have */
int st_ctime_s; /* usec fields.. */
};
/*
* prototypes for functions in fd.c
*/
extern void FileInvalidate(File file);
extern File FileNameOpenFile(FileName fileName, int fileFlags, int fileMode);
extern File PathNameOpenFile(FileName fileName, int fileFlags, int fileMode);
extern void FileClose(File file);
extern void FileUnlink(File file);
extern int FileRead(File file, char *buffer, int amount);
extern int FileWrite(File file, char *buffer, int amount);
extern long FileSeek(File file, long offset, int whence);
extern long FileTell(File file);
extern int FileTruncate(File file, int offset);
extern int FileSync(File file);
extern int FileNameUnlink(char *filename);
extern void AllocateFile(void);
extern void FreeFile(void);
extern void closeAllVfds(void);
extern void closeOneVfd(void);
#endif /* FD_H */
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