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Provide pg_pread() and pg_pwrite() for random I/O.

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Forward to POSIX pread() and pwrite(), or emulate them if unavailable.
The emulation is not perfect as the file position is changed, so
we'll put pg_ prefixes on the names to minimize the risk of confusion
in future patches that might inadvertently try to mix pread() and read()
on the same file descriptor.

Author: Thomas Munro
Reviewed-by: Tom Lane, Jesper Pedersen
Discussion: https://postgr.es/m/CAEepm=02rapCpPR3ZGF2vW=SBHSdFYO_bz_f-wwWJonmA3APgw@mail.gmail.com
This commit is contained in:
Thomas Munro
2018-11-07 09:50:01 +13:00
parent b43df566b3
commit 3fd2a7932e
8 changed files with 168 additions and 0 deletions
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26
configure vendored
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@ -15539,6 +15539,32 @@ esac
fi
ac_fn_c_check_func "$LINENO" "pread" "ac_cv_func_pread"
if test "x$ac_cv_func_pread" = xyes; then :
$as_echo "#define HAVE_PREAD 1" >>confdefs.h
else
case " $LIBOBJS " in
*" pread.$ac_objext "* ) ;;
*) LIBOBJS="$LIBOBJS pread.$ac_objext"
;;
esac
fi
ac_fn_c_check_func "$LINENO" "pwrite" "ac_cv_func_pwrite"
if test "x$ac_cv_func_pwrite" = xyes; then :
$as_echo "#define HAVE_PWRITE 1" >>confdefs.h
else
case " $LIBOBJS " in
*" pwrite.$ac_objext "* ) ;;
*) LIBOBJS="$LIBOBJS pwrite.$ac_objext"
;;
esac
fi
ac_fn_c_check_func "$LINENO" "random" "ac_cv_func_random"
if test "x$ac_cv_func_random" = xyes; then :
$as_echo "#define HAVE_RANDOM 1" >>confdefs.h