pgsql: pg_checksums: Handle read and write returns correctly

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pgsql: pg_checksums: Handle read and write returns correctly

Peter Eisentraut-3
pg_checksums: Handle read and write returns correctly

The read() return was not checking for errors, the write() return was
not checking for short writes.

Reviewed-by: Michael Paquier <[hidden email]>
Discussion: https://www.postgresql.org/message-id/flat/5de61b6b-8be9-7771-0048-860328efe027%402ndquadrant.com

Branch
------
REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/3e20b7fa408f1b5a1bf17120b55b5473e82a7e63

Modified Files
--------------
src/bin/pg_checksums/pg_checksums.c | 21 ++++++++++++++++-----
1 file changed, 16 insertions(+), 5 deletions(-)