Обсуждение: [HACKERS] Why are we including netinet/tcp.h so widely?

Hi,

A lot of files which currently include netinet/tcp.h. For most of them I
cannot recognize why, and it just seems to have been copied from one
file to the next.

E.g.
src/interfaces/libpq/{fe-secure,fe-protocol3,fe-protocol2,fe-secure}.c
src/backend/libpq/{be-secure,be-secure-openssl}.c
and probably some more.

Not that it's particularly harmful to include a superflous include, but
due to the #ifdef HAVE_NETINET_TCP_H it's three lines, and it seems to
be copied enough that I got curious.

Any reason that I'm missing? Old platforms? I couldn't find anything in
the archives.

Greetings,

Andres Freund


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Andres Freund <andres@anarazel.de> writes:
> A lot of files which currently include netinet/tcp.h. For most of them I
> cannot recognize why, and it just seems to have been copied from one
> file to the next.

According to POSIX, that supplies TCP_NODELAY, and a look into the
file here finds these other symbols we care about:

#define TCP_KEEPIDLE     4    /* Start keeplives after this period */
#define TCP_KEEPINTVL     5    /* Interval between keepalives */
#define TCP_KEEPCNT     6    /* Number of keepalives before death */

Probably you could drop it from any file not using any TCP_xxx
symbols.  I'd be a little wary of #ifdef checks in any file you're
about to remove it from, though, as those could mask any obvious
breakage.
        regards, tom lane


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