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/*------------------------------------------------------------------------- * * logtape.h * Management of "logical tapes" within temporary files. * * See logtape.c for explanations. * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/logtape.h * *------------------------------------------------------------------------- */ #ifndef LOGTAPE_H #define LOGTAPE_H /* LogicalTapeSet is an opaque type whose details are not known outside logtape.c. */ typedef struct LogicalTapeSet LogicalTapeSet; /* * prototypes for functions in logtape.c */ extern LogicalTapeSet *LogicalTapeSetCreate(int ntapes); extern void LogicalTapeSetClose(LogicalTapeSet *lts); extern void LogicalTapeSetForgetFreeSpace(LogicalTapeSet *lts); extern size_t LogicalTapeRead(LogicalTapeSet *lts, int tapenum, void *ptr, size_t size); extern void LogicalTapeWrite(LogicalTapeSet *lts, int tapenum, void *ptr, size_t size); extern void LogicalTapeRewind(LogicalTapeSet *lts, int tapenum, bool forWrite); extern void LogicalTapeFreeze(LogicalTapeSet *lts, int tapenum); extern bool LogicalTapeBackspace(LogicalTapeSet *lts, int tapenum, size_t size); extern bool LogicalTapeSeek(LogicalTapeSet *lts, int tapenum, long blocknum, int offset); extern void LogicalTapeTell(LogicalTapeSet *lts, int tapenum, long *blocknum, int *offset); extern long LogicalTapeSetBlocks(LogicalTapeSet *lts); #endif /* LOGTAPE_H */