Don't try to call posix_fadvise() unless <fcntl.h> supplies a declaration
for it. Hopefully will fix core dump evidenced by some buildfarm members since fadvise patch went in. The actual definition of the function is not ABI-compatible with compiler's default assumption in the absence of any declaration, so it's clearly unsafe to try to call it without seeing a declaration.
This commit is contained in:
Tom Lane
parent
22045666d6
commit
1e8ae13640
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@ -13917,6 +13917,79 @@ _ACEOF
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fi
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echo "$as_me:$LINENO: checking whether posix_fadvise is declared" >&5
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echo $ECHO_N "checking whether posix_fadvise is declared... $ECHO_C" >&6
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if test "${ac_cv_have_decl_posix_fadvise+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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/* confdefs.h. */
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_ACEOF
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cat confdefs.h >>conftest.$ac_ext
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cat >>conftest.$ac_ext <<_ACEOF
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/* end confdefs.h. */
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#include <fcntl.h>
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int
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main ()
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{
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#ifndef posix_fadvise
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char *p = (char *) posix_fadvise;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext
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if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
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(eval $ac_compile) 2>conftest.er1
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ac_status=$?
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grep -v '^ *+' conftest.er1 >conftest.err
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rm -f conftest.er1
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cat conftest.err >&5
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -z "$ac_c_werror_flag"
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|| test ! -s conftest.err'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; } &&
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{ ac_try='test -s conftest.$ac_objext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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ac_cv_have_decl_posix_fadvise=yes
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else
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echo "$as_me: failed program was:" >&5
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sed 's/^/| /' conftest.$ac_ext >&5
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ac_cv_have_decl_posix_fadvise=no
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fi
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rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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echo "$as_me:$LINENO: result: $ac_cv_have_decl_posix_fadvise" >&5
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echo "${ECHO_T}$ac_cv_have_decl_posix_fadvise" >&6
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if test $ac_cv_have_decl_posix_fadvise = yes; then
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_POSIX_FADVISE 1
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_ACEOF
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else
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cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_POSIX_FADVISE 0
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_ACEOF
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fi
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HAVE_IPV6=no
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echo "$as_me:$LINENO: checking for struct sockaddr_in6" >&5
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@ -1,5 +1,5 @@
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dnl Process this file with autoconf to produce a configure script.
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dnl $PostgreSQL: pgsql/configure.in,v 1.466 2006/06/07 22:24:43 momjian Exp $
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dnl $PostgreSQL: pgsql/configure.in,v 1.467 2006/06/18 18:30:20 tgl Exp $
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dnl
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dnl Developers, please strive to achieve this order:
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dnl
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@ -864,6 +864,7 @@ PGAC_FUNC_GETTIMEOFDAY_1ARG
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AC_CHECK_FUNCS([cbrt dlopen fcvt fdatasync getpeereid memmove poll pstat readlink setproctitle setsid sigprocmask symlink sysconf towlower utime utimes waitpid wcstombs])
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AC_CHECK_DECLS(fdatasync, [], [], [#include <unistd.h>])
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AC_CHECK_DECLS(posix_fadvise, [], [], [#include <fcntl.h>])
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HAVE_IPV6=no
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AC_CHECK_TYPE([struct sockaddr_in6],
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.239 2006/06/16 04:11:48 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.240 2006/06/18 18:30:20 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -2147,11 +2147,13 @@ XLogFileClose(void)
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{
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Assert(openLogFile >= 0);
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#ifdef POSIX_FADV_DONTNEED
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#if defined(HAVE_DECL_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
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/*
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* WAL caches will not be accessed in the future, so we advise OS to
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* free them. But we will not do so if WAL archiving is active,
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* because archivers might use the caches to read the WAL segment.
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* WAL segment files will not be re-read in normal operation, so we advise
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* OS to release any cached pages. But do not do so if WAL archiving is
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* active, because archiver process could use the cache to read the WAL
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* segment.
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*
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* While O_DIRECT works for O_SYNC, posix_fadvise() works for fsync()
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* and O_SYNC, and some platforms only have posix_fadvise().
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*/
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@ -76,6 +76,10 @@
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don't. */
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#undef HAVE_DECL_F_FULLFSYNC
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/* Define to 1 if you have the declaration of `posix_fadvise', and to 0 if you
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don't. */
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#undef HAVE_DECL_POSIX_FADVISE
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/* Define to 1 if you have the declaration of `snprintf', and to 0 if you
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don't. */
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#undef HAVE_DECL_SNPRINTF
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