nice

实战Linux编程的原代码,希望对学驱动的人能有所帮助

#! /bin/sh
# This script takes no arguments.

if test -n "$DJDIR"; then
  echo "$0: cannot test nice on DJGPP" >&2
  exit 77
fi

tests='
0 empty 10
1 -1 1
2 -12 12
3 -1:-2 2
4 -n:1 1
5 -n:1:-2 2
6 -n:1:-+12 12
7 -2:-n:1 1
8 -2:-n:12 12
9 -+1 1
10 -+12 12
11 -+1:-+12 12
12 -n:+1 1
13 --1:-2 2
14 --1:-2:-13 13
15 --1:-n:2 2
16 --1:-n:2:-3 3
17 --1:-n:2:-13 13
18 -n:-1:-12 12
19 --1:-12 12
NA LAST NA
'
set - $tests

if test "$VERBOSE" = yes; then
  nice --version
  set -x
fi

_POSIX2_VERSION=199209
export _POSIX2_VERSION

# Require that this test be run at `nice' level 0.
niceness=`nice`
if test "$niceness" = 0; then
    : ok
else
  echo "$0: this test must be run at nice level 0" 1>&2
  exit 77
fi

fail=0
while :; do
  test_name=$1
  args=$2
  expected_result=$3
  test $args = empty && args=''
  test x$args = xLAST && break
  args=`echo x$args|tr : ' '|sed 's/^x//'`
  if test "$VERBOSE" = yes; then
    #echo "testing \`nice $args nice\` = $expected_result ..."
    echo "test $test_name... " | tr -d '\012'
  fi
  test x`nice $args nice 2> /dev/null` = x$expected_result \
    && ok=ok || ok=FAIL fail=1
  test "$VERBOSE" = yes && echo $ok
  test x`nice $args nice 2> /dev/null` = x$expected_result || fail=1
  shift; shift; shift
done

exit $fail