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/*-------------------------------------------------------------------------
*
* fd.h
* Virtual file descriptor definitions.
*
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: fd.h,v 1.34 2001/11/05 17:46:35 momjian Exp $
*
*-------------------------------------------------------------------------
*/
/*
* calls:
*
* File {Close, Read, Write, Seek, Tell, MarkDirty, Sync}
* {File Name Open, Allocate, Free} File
*
* These are NOT JUST RENAMINGS OF THE UNIX ROUTINES.
* Use them for all file activity...
*
* File fd;
* fd = FilePathOpenFile("foo", O_RDONLY, 0600);
*
* AllocateFile();
* FreeFile();
*
* Use AllocateFile, not fopen, if you need a stdio file (FILE*); then
* use FreeFile, not fclose, to close it. AVOID using stdio for files
* that you intend to hold open for any length of time, since there is
* no way for them to share kernel file descriptors with other files.
*/
#ifndef FD_H
#define FD_H
/*
* FileSeek uses the standard UNIX lseek(2) flags.
*/
typedef char *FileName;
typedef int File;
/* GUC parameter */
extern int max_files_per_process;
/*
* prototypes for functions in fd.c
*/
/* Operations on virtual Files --- equivalent to Unix kernel file ops */
extern File FileNameOpenFile(FileName fileName, int fileFlags, int fileMode);
extern File PathNameOpenFile(FileName fileName, int fileFlags, int fileMode);
extern File OpenTemporaryFile(void);
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 int FileTruncate(File file, long offset);
extern int FileSync(File file);
extern void FileMarkDirty(File file);
/* Operations that allow use of regular stdio --- USE WITH CAUTION */
extern FILE *AllocateFile(char *name, char *mode);
extern void FreeFile(FILE *);
/* If you've really really gotta have a plain kernel FD, use this */
extern int BasicOpenFile(FileName fileName, int fileFlags, int fileMode);
/* Miscellaneous support routines */
extern void closeAllVfds(void);
extern void AtEOXact_Files(void);
extern void RemovePgTempFiles(void);
extern int pg_fsync(int fd);
extern int pg_fdatasync(int fd);
#endif /* FD_H */
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