1 /*-------------------------------------------------------------------------
4 * Management of "logical tapes" within temporary files.
6 * See logtape.c for explanations.
8 * Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
9 * Portions Copyright (c) 1994, Regents of the University of California
11 * src/include/utils/logtape.h
13 *-------------------------------------------------------------------------
19 /* LogicalTapeSet is an opaque type whose details are not known outside logtape.c. */
21 typedef struct LogicalTapeSet LogicalTapeSet;
24 * prototypes for functions in logtape.c
27 extern LogicalTapeSet *LogicalTapeSetCreate(int ntapes);
28 extern void LogicalTapeSetClose(LogicalTapeSet *lts);
29 extern void LogicalTapeSetForgetFreeSpace(LogicalTapeSet *lts);
30 extern size_t LogicalTapeRead(LogicalTapeSet *lts, int tapenum,
31 void *ptr, size_t size);
32 extern void LogicalTapeWrite(LogicalTapeSet *lts, int tapenum,
33 void *ptr, size_t size);
34 extern void LogicalTapeRewind(LogicalTapeSet *lts, int tapenum, bool forWrite);
35 extern void LogicalTapeFreeze(LogicalTapeSet *lts, int tapenum);
36 extern bool LogicalTapeBackspace(LogicalTapeSet *lts, int tapenum,
38 extern bool LogicalTapeSeek(LogicalTapeSet *lts, int tapenum,
39 long blocknum, int offset);
40 extern void LogicalTapeTell(LogicalTapeSet *lts, int tapenum,
41 long *blocknum, int *offset);
42 extern long LogicalTapeSetBlocks(LogicalTapeSet *lts);
44 #endif /* LOGTAPE_H */