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#
if test "$tst_links_writev" = "yes"; then
AC_MSG_CHECKING([if writev is prototyped])
AC_EGREP_CPP([writev],[
$cares_includes_sys_uio
],[
AC_MSG_RESULT([yes])
tst_proto_writev="yes"
],[
AC_MSG_RESULT([no])
tst_proto_writev="no"
])
fi
#
if test "$tst_proto_writev" = "yes"; then
AC_MSG_CHECKING([if writev is compilable])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([[
$cares_includes_sys_uio
]],[[
if(0 != writev(0, 0, 0))
return 1;
]])
],[
AC_MSG_RESULT([yes])
tst_compi_writev="yes"
],[
AC_MSG_RESULT([no])
tst_compi_writev="no"
])
fi
#
if test "$tst_compi_writev" = "yes"; then
AC_MSG_CHECKING([if writev usage allowed])
if test "x$cares_disallow_writev" != "xyes"; then
AC_MSG_RESULT([yes])
tst_allow_writev="yes"
else
AC_MSG_RESULT([no])
tst_allow_writev="no"
fi
fi
#
AC_MSG_CHECKING([if writev might be used])
if test "$tst_links_writev" = "yes" &&
test "$tst_proto_writev" = "yes" &&
test "$tst_compi_writev" = "yes" &&
test "$tst_allow_writev" = "yes"; then
AC_MSG_RESULT([yes])
AC_DEFINE_UNQUOTED(HAVE_WRITEV, 1,
[Define to 1 if you have the writev function.])
ac_cv_func_writev="yes"
else
AC_MSG_RESULT([no])
ac_cv_func_writev="no"
fi
])