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src/test/examples/testlibpq2.c where the HAVE_SYS_SELECT_H is defined. - Mailing list pgsql-general

From jian he
Subject src/test/examples/testlibpq2.c where the HAVE_SYS_SELECT_H is defined.
Date
Msg-id CACJufxG90JSQUxUzfsfNGeDFat6ma2CenqnVzV0SrpURye0gdA@mail.gmail.com
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Responses Re: src/test/examples/testlibpq2.c where the HAVE_SYS_SELECT_H is defined.  (Thomas Munro <thomas.munro@gmail.com>)
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Hi,
playing around with $[0] testlibpq2.c example. I wondered where HAVE_SYS_SELECT_H is defined?

I searched on the internet, founded that people also asked the same question in $[1].

In my machine, I do have <sys/select.h>.
system version: Ubuntu 22.04.1 LTS
gcc version: gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0
gcc compile command: gcc pg_testlibpq2.c -I/home/jian/postgres/pg16/include \
-L/home/jian/postgres/pg16/lib -lpq

[0]https://www.postgresql.org/docs/current/libpq-example.html
[1]https://stackoverflow.com/questions/37876850/in-compilation-time-how-to-find-the-macro-is-defined-in-which-header-file

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