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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) while
determining the wal_segment_size, pg_waldump checked errno, despite errno not
being 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.com
Backpatch: 11-, the bug was introducedin fc49e24fa
This commit is contained in:
Andres Freund 2022-02-25 10:30:05 -08:00
parent 7d80e93fb1
commit 9ff7fd9063
1 changed files with 5 additions and 8 deletions
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13
src/bin/pg_waldump/pg_waldump.c
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@ -204,15 +204,12 @@ search_directory(const char *directory, const char *fname)
WalSegSz),
fname, WalSegSz);
}
else if (r < 0)
fatal_error("could not read file \"%s\": %m",
fname);
else
{
if (errno != 0)
fatal_error("could not read file \"%s\": %m",
fname);
else
fatal_error("could not read file \"%s\": read %d of %zu",
fname, r, (Size) XLOG_BLCKSZ);
}
fatal_error("could not read file \"%s\": read %d of %zu",
fname, r, (Size) XLOG_BLCKSZ);
close(fd);
return true;
}