Back to the Main Page. | ac_very_nice |
Download the M4 Source. |
AC_VERY_NICE
1.1.1.1 (2001/07/26) Miscellaneous @ ac-archive-0.5.39
Stephane Bortzmeyer <bortzmeyer@pasteur.fr>
A macro to check the options of nice, in order to have a VERY_NICE variable which runs a program at the lowest priority VERY_NICE is undefined if we don't find the proper options, so you can safely use:
@VERY_NICE@ mycommand
in a shell script.
The VERY_NICE variable includes the placeholder NICE_VALUE that you have to instantiate at run-time. If you give a argument to AC_VERY_NICE, it will be used as an argument of nice for testing and included in VERY_NICE instead of the above placeholder.
AC_DEFUN([AC_VERY_NICE],[ if test "x$1" != "x"; then NICE_VALUE=$1 else NICE_VALUE=20 fi AC_CHECK_PROGS(TEST_NICE, date) AC_CHECK_PROGS(NICE, nice, ) AC_MSG_CHECKING(syntax of nice) if test "x$NICE" != "x"; then if ( $NICE -n $NICE_VALUE $TEST_NICE > /dev/null 2>&1 ) ; then VERY_NICE="$NICE -n $NICE_VALUE" else if ( $NICE -$NICE_VALUE $TEST_NICE > /dev/null 2>&1 ) ; then VERY_NICE="$NICE -$NICE_VALUE" fi fi fi if test "x$1" = "x"; then VERY_NICE=`echo $VERY_NICE | sed "s/$NICE_VALUE/NICE_VALUE/"` fi AC_MSG_RESULT($VERY_NICE) AC_SUBST(VERY_NICE) ])