Re: [HACKERS] PostgreSQL libraries - PThread Support, but - Mailing list pgsql-patches

This patch handles two more gethostbyname calls.

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Lee Kindness wrote:
Content-Description: message body text

> Patch attached, along with new libpq-reentrant.c and libpq-reentrant.h
> files for src/interfaces/libpq.
>
> Also at http://services.csl.co.uk/postgresql/
>
> Thanks, Lee.
>
> Lee Kindness writes:
>  > Ok guys, I propose that the new libpq diff and 2 source files which
>  > i'll soon send to pgsql-patches is applied to the source. This diff is
>  > a cleaned up version of the previous version with the wrapper
>  > functions moved out into their own file and more comments added. Also
>  > the use of crypt_r() has been removed (not worth the effort), the
>  > cpp defines have been renamed to be consistent with each other and
>  > Tom's concerns with loose #defines has been partly addressed.
>  >
>  > This diff does not include any configure changes. I plan to tackle
>  > this separately ASAP, and hopefully produce something more acceptable.
>  >
>  > I will add checks for appropriate compiler thread flags (for compiling
>  > libpq, and alow the removal of #defines in libpq-reentrant.h), and
>  > link flags & libs (for a planned threaded libpq test program and
>  > renentrant ecpg library). If a thread environment is found then check
>  > for the reentrant functions will be done.
>  >
>  > Looking at various open source projects configure.in files there seems
>  > to be little commonality in the thread test macros (telp gratefully
>  > accepted!), I currently think that something like the approach used by
>  > glib is most suitable (switch on OS).
>  >
>  > All sound acceptable?
>  >
>  > Thanks, Lee.
>  >
>  > Peter Eisentraut writes:
>  >  > Lee Kindness writes:
>  >  >
>  >  > > Patches attached to make libpq thread-safe, now uses strerror_r(),
>  >  > > gethostbyname_r(), getpwuid_r() and crypt_r() where available. Where
>  >  > > strtok() was previously used strchr() is now used.
>  >  >
>  >  > AC_TRY_RUN tests are prohibited.  Also, try to factor out some of these
>  >  > huge tests into separate macros and put them into config/c-library.m4.
>  >  > And it would be nice if there was some documentation about what was
>  >  > checked for.  If you just want to check whether gethostbyname_r() has 5 or
>  >  > 6 arguments you can do that in half the space.
>

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--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073
Index: src/interfaces/libpq/fe-secure.c
===================================================================
RCS file: /cvsroot/pgsql-server/src/interfaces/libpq/fe-secure.c,v
retrieving revision 1.24
diff -c -c -r1.24 fe-secure.c
*** src/interfaces/libpq/fe-secure.c    14 Jun 2003 17:49:54 -0000    1.24
--- src/interfaces/libpq/fe-secure.c    14 Jun 2003 18:08:54 -0000
***************
*** 453,460 ****
      if (addr.sa_family == AF_UNIX)
          return 0;

      /* what do we know about the peer's common name? */
!     if ((h = gethostbyname(conn->peer_cn)) == NULL)
      {
          printfPQExpBuffer(&conn->errorMessage,
          libpq_gettext("could not get information about host (%s): %s\n"),
--- 453,469 ----
      if (addr.sa_family == AF_UNIX)
          return 0;

+     {
+         struct hostent hpstr;
+         char buf[BUFSIZ];
+         int herrno = 0;
+
+         pqGethostbyname(conn->peer_cn, &hpstr, buf, sizeof(buf),
+                         &h, &herrno);
+     }
+
      /* what do we know about the peer's common name? */
!     if ((h == NULL)
      {
          printfPQExpBuffer(&conn->errorMessage,
          libpq_gettext("could not get information about host (%s): %s\n"),
Index: src/port/getaddrinfo.c
===================================================================
RCS file: /cvsroot/pgsql-server/src/port/getaddrinfo.c,v
retrieving revision 1.7
diff -c -c -r1.7 getaddrinfo.c
*** src/port/getaddrinfo.c    12 Jun 2003 08:15:29 -0000    1.7
--- src/port/getaddrinfo.c    14 Jun 2003 18:08:55 -0000
***************
*** 84,91 ****
--- 84,99 ----
          else
          {
              struct hostent *hp;
+ #ifdef FRONTEND
+             struct hostent hpstr;
+             char buf[BUFSIZ];
+             int herrno = 0;

+             pqGethostbyname(node, &hpstr, buf, sizeof(buf),
+                             &hp, &herrno);
+ #else
              hp = gethostbyname(node);
+ #endif
              if (hp == NULL)
              {
                  switch (h_errno)