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pg_waldump: Fix error message for WAL files smaller than XLOG_BLCKSZ.

When opening a WAL file smaller than XLOG_BLCKSZ (e.g. 0 bytes long) whiledetermining the wal_segment_size, pg_waldump checked errno, despite errno notbeing set by the short read. Resulting in a bogus error message.Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>Discussion:https://postgr.es/m/20220214.181847.775024684568733277.horikyota.ntt@gmail.comBackpatch: 11-, the bug was introducedinfc49e24

1 parent7d80e93 commit9ff7fd9Copy full SHA for 9ff7fd9

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src/bin/pg_waldump
- pg_waldump.c

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-8

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`‎src/bin/pg_waldump/pg_waldump.c‎`

Lines changed: 5 additions & 8 deletions

Original file line number	Diff line number	Diff line change
`@@ -204,15 +204,12 @@ search_directory(const char directory, const char fname)`
`204`	`204`	`WalSegSz),`
`205`	`205`	`fname,WalSegSz);`
`206`	`206`	`}`
	`207`	`+elseif (r<0)`
	`208`	`+fatal_error("could not read file \"%s\": %m",`
	`209`	`+fname);`
`207`	`210`	`else`
`208`		`-{`
`209`		`-if (errno!=0)`
`210`		`-fatal_error("could not read file \"%s\": %m",`
`211`		`-fname);`
`212`		`-else`
`213`		`-fatal_error("could not read file \"%s\": read %d of %zu",`
`214`		`-fname,r, (Size)XLOG_BLCKSZ);`
`215`		`-}`
	`211`	`+fatal_error("could not read file \"%s\": read %d of %zu",`
	`212`	`+fname,r, (Size)XLOG_BLCKSZ);`
`216`	`213`	`close(fd);`
`217`	`214`	`return true;`
`218`	`215`	`}`

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Commit9ff7fd9

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`‎src/bin/pg_waldump/pg_waldump.c‎`

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