Hi,
Some time ago,the following patch clean up error handling in pg_basebackup's walmethods.c. https://github.com/postgres/postgres/commit/248c3a9 This patch keep the error state in the DirectoryMethodData struct, in most functions, the lasterrno is set correctly, but in function dir_existsfile(), the lasterrno is not set when the file fails to open. If this is a correction omission, I think this patch can fix this. Cheers
add_lasterrno_setting.patch
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