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Add BufFileRead variants with short read and EOF detection

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Most callers of BufFileRead() want to check whether they read the full
specified length.  Checking this at every call site is very tedious.
This patch provides additional variants BufFileReadExact() and
BufFileReadMaybeEOF() that include the length checks.

I considered changing BufFileRead() itself, but this function is also
used in extensions, and so changing the behavior like this would
create a lot of problems there.  The new names are analogous to the
existing LogicalTapeReadExact().

Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/f3501945-c591-8cc3-5ef0-b72a2e0eaa9c@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2023-01-16 09:20:44 +01:00
parent 1561612e3b
commit 20428d344a
9 changed files with 73 additions and 134 deletions
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4
src/include/storage/buffile.h
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@@ -38,7 +38,9 @@ typedef struct BufFile BufFile;
extern BufFile *BufFileCreateTemp(bool interXact);
extern void BufFileClose(BufFile *file);
extern size_t BufFileRead(BufFile *file, void *ptr, size_t size);
extern pg_nodiscard size_t BufFileRead(BufFile *file, void *ptr, size_t size);
extern void BufFileReadExact(BufFile *file, void *ptr, size_t size);
extern size_t BufFileReadMaybeEOF(BufFile *file, void *ptr, size_t size, bool eofOK);
extern void BufFileWrite(BufFile *file, const void *ptr, size_t size);
extern int BufFileSeek(BufFile *file, int fileno, off_t offset, int whence);
extern void BufFileTell(BufFile *file, int *fileno, off_t *offset);