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Fix pg_truncate() on Windows.

Commit57faaf3 added pg_truncate(const char *path, off_t length), but"length" was ignored under WIN32 and the file was unconditionallytruncated to 0.There was no live bug, since the only caller passes 0.Fix, and back-patch to 14 where the function arrived.Author: Justin Pryzby <pryzby@telsasoft.com>Discussion:https://postgr.es/m/20230106031652.GR3109%40telsasoft.com

1 parent8cd190e commitaf209b7Copy full SHA for af209b7

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src/backend/storage/file
- fd.c

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`‎src/backend/storage/file/fd.c‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -642,7 +642,7 @@ pg_truncate(const char *path, off_t length)`
`642`	`642`	`fd=OpenTransientFile(path,O_RDWR \|PG_BINARY);`
`643`	`643`	`if (fd >=0)`
`644`	`644`	`{`
`645`		`-ret=ftruncate(fd,0);`
	`645`	`+ret=ftruncate(fd,length);`
`646`	`646`	`save_errno=errno;`
`647`	`647`	`CloseTransientFile(fd);`
`648`	`648`	`errno=save_errno;`

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Commitaf209b7

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`‎src/backend/storage/file/fd.c‎`

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