Horton

Re: Allowing printf("%m") only where it actually works

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Michael Paquier <michael@paquier.xyz>
Cc: Alvaro Herrera <alvherre@2ndquadrant.com>, Thomas Munro <thomas.munro@enterprisedb.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2018-09-26T15:09:59Z
Lists: pgsql-hackers 
Michael Paquier <michael@paquier.xyz> writes:
> On Tue, Sep 25, 2018 at 12:05:42PM -0400, Tom Lane wrote:
>> Alvaro Herrera <alvherre@2ndquadrant.com> writes:
>>> Actually I think it *is* useful to do it like this, because then the
>>> user knows to fix the netmsg.dll problem so that they can continue to
>>> investigate the winsock problem.  If we don't report the secondary error
>>> message, how are users going to figure out how to fix the problem?

>> OK, I'm fine with doing it like that if people want it.

> +1.

OK, pushed 0001 with that adjustment.

While looking over the thread, I remembered I wanted to convert
strerror_r into a wrapper as well.  Think I'll go do that next,
because really it'd be better for snprintf.c to be calling strerror_r
not strerror.

			regards, tom lane

Commits

  1. In pg_log_generic(), be more paranoid about preserving errno.

  2. Make src/common/exec.c's error logging less ugly.

  3. Select appropriate PG_PRINTF_ATTRIBUTE for recent NetBSD.

  4. Fix detection of the result type of strerror_r().

  5. Try another way to detect the result type of strerror_r().

  6. Clean up *printf macros to avoid conflict with format archetypes.

  7. Fix link failures due to snprintf/strerror changes.

  8. Implement %m in src/port/snprintf.c, and teach elog.c to rely on that.

  9. Always use our own versions of *printf().

  10. Incorporate strerror_r() into src/port/snprintf.c, too.

  11. Convert elog.c's useful_strerror() into a globally-used strerror wrapper.

  12. Revert "Distinguish printf-like functions that support %m from those that don't."

  13. Produce compiler errors if errno is referenced inside elog/ereport calls.

  14. Distinguish printf-like functions that support %m from those that don't.

  15. Fix unportable usage of printf("%m").

  16. Be more robust when strerror() doesn't give a useful result.