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实战Linux编程的原代码,希望对学驱动的人能有所帮助

#!/bin/sh
# make sure mkdir's -p options works properly

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

pwd=`pwd`
tmp=parents-$$
trap 'status=$?; cd $pwd; rm -rf $tmp && exit $status' 0
trap '(exit $?); exit' 1 2 13 15

framework_failure=0

# Record absolute path of srcdir.
cd $srcdir || framework_failure=1
abs_srcdir=`pwd`

cd $pwd || framework_failure=1
mkdir $tmp || framework_failure=1
cd $tmp || framework_failure=1
mkdir -m 700 e-dir || framework_failure=1

if test $framework_failure = 1; then
  echo 'failure in testing framework'
  (exit 1); exit
fi

. $abs_srcdir/../setgid-check

fail=0

# Make sure `mkdir -p existing-dir' succeeds
# and that `mkdir existing-dir' fails.
mkdir -p e-dir || fail=1
mkdir e-dir > /dev/null 2>&1 && fail=1

# Create an existing directory.
umask 077
mode_str=drwxr-x-wx
mode_arg=`$abs_srcdir/../rwx-to-mode $mode_str`
mkdir -m $mode_arg a || fail=1

# this `mkdir -p ...' shouldn't change perms of existing dir `a'.
d_mode_str=drwx-w--wx
d_mode_arg=`$abs_srcdir/../rwx-to-mode $d_mode_str`
mkdir -p -m $d_mode_arg a/b/c/d

# Make sure the permissions of `a' haven't been changed.
p=`ls -ld a|sed 's/ .*//'`; case $p in $mode_str);; *) fail=1;; esac
# `b's and `c's should reflect the umask
p=`ls -ld a/b|sed 's/ .*//'`; case $p in drwx------);; *) fail=1;; esac
p=`ls -ld a/b/c|sed 's/ .*//'`; case $p in drwx------);; *) fail=1;; esac

# `d's perms are determined by the -m argument.
p=`ls -ld a/b/c/d|sed 's/ .*//'`; case $p in $d_mode_str);; *) fail=1;; esac

(exit $fail); exit