* Virtual file descriptor definitions.
*
*
- * Portions Copyright (c) 1996-2000, PostgreSQL, Inc
+ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
- * $Id: fd.h,v 1.23 2000/11/10 03:53:45 vadim Exp $
+ * $PostgreSQL: pgsql/src/include/storage/fd.h,v 1.63 2009/01/01 17:24:01 momjian Exp $
*
*-------------------------------------------------------------------------
*/
/*
* calls:
*
- * File {Close, Read, Write, Seek, Tell, MarkDirty, Sync}
+ * File {Close, Read, Write, Seek, Tell, Sync}
* {File Name Open, Allocate, Free} File
*
* These are NOT JUST RENAMINGS OF THE UNIX ROUTINES.
* 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.
+ *
+ * Likewise, use AllocateDir/FreeDir, not opendir/closedir, to allocate
+ * open directories (DIR*).
*/
#ifndef FD_H
#define FD_H
+#include <dirent.h>
+
+
/*
* FileSeek uses the standard UNIX lseek(2) flags.
*/
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 File OpenTemporaryFile(bool interXact);
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);
+extern off_t FileSeek(File file, off_t offset, int whence);
+extern int FileTruncate(File file, off_t offset);
/* Operations that allow use of regular stdio --- USE WITH CAUTION */
-extern FILE *AllocateFile(char *name, char *mode);
-extern void FreeFile(FILE *);
+extern FILE *AllocateFile(const char *name, const char *mode);
+extern int FreeFile(FILE *file);
+
+/* Operations to allow use of the <dirent.h> library routines */
+extern DIR *AllocateDir(const char *dirname);
+extern struct dirent *ReadDir(DIR *dir, const char *dirname);
+extern int FreeDir(DIR *dir);
/* 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 InitFileAccess(void);
+extern void set_max_safe_fds(void);
extern void closeAllVfds(void);
+extern void SetTempTablespaces(Oid *tableSpaces, int numSpaces);
+extern bool TempTablespacesAreSet(void);
+extern Oid GetNextTempTableSpace(void);
extern void AtEOXact_Files(void);
+extern void AtEOSubXact_Files(bool isCommit, SubTransactionId mySubid,
+ SubTransactionId parentSubid);
+extern void RemovePgTempFiles(void);
-#ifdef XLOG
-#define pg_fsync(fd) fsync(fd)
-#else
extern int pg_fsync(int fd);
-#endif
+extern int pg_fsync_no_writethrough(int fd);
+extern int pg_fsync_writethrough(int fd);
+extern int pg_fdatasync(int fd);
+
+/* Filename components for OpenTemporaryFile */
+#define PG_TEMP_FILES_DIR "pgsql_tmp"
+#define PG_TEMP_FILE_PREFIX "pgsql_tmp"
-#endif /* FD_H */
+#endif /* FD_H */