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<?php
header ( "content-type:text/html; charset=utf-8" );

    function strcut($string, $length, $dot = '...',$charset='utf-8')
        {

      $strlen = strlen($string);

      if($strlen <= $length) return $string;

      $strcut = '';

      if(strtolower($charset) == 'utf-8')

      {

      $n = $tn = $noc = 0;

      while($n < $strlen)

      {

      $t = ord($string[$n]);

      if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {

      $tn = 1; $n++; $noc++;

      } elseif(194 <= $t && $t <= 223) {

      $tn = 2; $n += 2; $noc += 2;

      } elseif(224 <= $t && $t <= 239) {

      $tn = 3; $n += 3; $noc += 3;

      } elseif(240 <= $t && $t <= 247) {

      $tn = 4; $n += 4; $noc += 4;

      } elseif(248 <= $t && $t <= 251) {

      $tn = 5; $n += 5; $noc += 5;
      } elseif($t == 252 || $t == 253)
      {
        $tn = 6; $n += 6; $noc += 6;
      }
      else
      {

      $n++;

      }
      if($noc >= $length) break;
      }
      if($noc > $length) $n -= $tn;
      $strcut = substr($string, 0, $n);

      }
      else
      {
        $dotlen = strlen($dot);
        $maxi = $length - $dotlen - 1;

        for($i = 0; $i < $maxi; $i++)
        {
          $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i];
        }
      }
      var_dump($strcut);
      return $strcut;
        }
        echo "jjjkkklll";
        echo strcut("向kk向向向kk向向向kk向向kkklllllllllllmmmmmmmmmmmmmmm向东阳",12)


?>

<?php
$dir = @ opendir("software");

while (($file = readdir($dir)) !== false)
  {
  echo "filename: " . $file."\n";
  }
  closedir($dir);
?>

/*
* filename: my_chmod.c
* Email: lin.jian1986@gmail.com
* Date: 2008/10/24
*/

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <assert.h>

#include "../my_error.h"

#define MODE O777
#define CHMOD(file, MODE);         {                \
           if ( chmod(file, statbuf.st_mode) < 0 ) \
            my_error( "chmod" );                \
        break;                                    \
        }

/* return 'n' when arg is number, or 's' if arg is string*/
int number_or_string( const char *arg )
{
    assert( arg != NULL );
    if ( arg[0] >= '0' && arg[0] <= '9' )
        return 'n';
    return 's';
}

/* the implement of number argument */
void number_chmod( const char *arg, const char *file )
{
    int mode;

    mode = atoi( arg );
    if ( mode > 777 || mode < 0 ) {
        fprintf( stderr, "usage: mode" );
        exit ( 1 );
    }

    /* To change a decimal system to a octal system */
    sscanf( arg, "%o", &mode );
    if ( chmod(file, mode) == -1 )
        exit ( 2 );
}

/* the implement of string argument */
void string_chmod( const char *arg, const char *file )
{
    int i, j;
    int mode;
    struct stat statbuf;
    
    if ( stat(file, &statbuf) < 0 )    
        my_error( "stat" );

    
    for ( i = 0; i < strlen(arg); i += j + 1 ) {
        /* if change the user mode */
        if ( arg[i] == 'u' ) {
            for ( j = 2; arg[i + j] != ' ' && arg[i + j] != '\t'; ++j ) {
                switch ( arg[i + j] ) {
                case 'r':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IRUSR;
                    else
                        statbuf.st_mode &= ~S_IRUSR;
                    CHMOD(file, MODE);
                case 'w':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IWUSR;
                    else
                        statbuf.st_mode &= ~S_IWUSR;
                    CHMOD(file, MODE);
                case 'x':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IXUSR;
                    else
                        statbuf.st_mode &= ~S_IXUSR;
                    CHMOD(file, MODE);
                default:
                    exit ( 1 );
                }
            }
        }
        /* if change the group mode */
        else if ( arg[i] == 'g' ) {
            for ( j = 2; arg[i + j] != ' ' && arg[i + j] != '\t'; ++j ) {
                switch ( arg[i + j] ) {
                case 'r':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IRGRP;
                    else
                        statbuf.st_mode &= ~S_IRGRP;
                    CHMOD(file, MODE);
                case 'w':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IWGRP;
                    else
                        statbuf.st_mode &= ~S_IWGRP;
                    CHMOD(file, MODE);
                case 'x':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IXGRP;
                    else
                        statbuf.st_mode &= ~S_IXGRP;
                    CHMOD(file, MODE);
                default:
                    exit ( 1 );
                }
            }
        }
        /* if change the other user mode */
        else if ( arg[i] == 'o' ) {
            for ( j = 2; arg[i + j] != ' ' && arg[i + j] != '\t'; ++j ) {
                switch ( arg[i + j] ) {
                case 'r':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IROTH;
                    else
                        statbuf.st_mode &= ~S_IROTH;
                    CHMOD(file, MODE);
                case 'w':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IWOTH;
                    else
                        statbuf.st_mode &= ~S_IWOTH;
                    CHMOD(file, MODE);
                case 'x':
                    if ( arg[i + 1] == '+' )
                        statbuf.st_mode |= S_IXOTH;
                    else
                        statbuf.st_mode &= ~S_IXOTH;
                    CHMOD(file, MODE);
                default:
                    exit ( 1 );
                }
            }
        }
    }
}

int main( int argc, char *argv[] )
{
    int    mode;
    char buf[20];

    if ( argc < 3 ) {
        fprintf( stderr, "usage: argc < 3" );
        exit (1);
    }
    
    if ( number_or_string(argv[1]) == 'n' )
        number_chmod( argv[1], argv[argc - 1] );
    else {
        strcpy( buf, argv[1] );
        for ( int i = 2; i < argc - 1; i++ ) {
            strcat( buf, " ");
            strcat( buf, argv[i] );
        }

        string_chmod( buf, argv[argc - 1] );
    }

    return 0;
}

ken@ken-laptop:~/linux_c/chap6$ ls -l test.c
-rwxrwxrwx 1 ken ken 0 2008-10-23 19:14 test.c
ken@ken-laptop:~/linux_c/chap6$ ./my_chmod 745 test.c
ken@ken-laptop:~/linux_c/chap6$ ls -l test.c
-rwxr--r-x 1 ken ken 0 2008-10-23 19:14 test.c
ken@ken-laptop:~/linux_c/chap6$ ./my_chmod u-rw g+w o-rx test.c
ken@ken-laptop:~/linux_c/chap6$ ls -l test.c
---xrw---- 1 ken ken 0 2008-10-23 19:14 test.c

<?php

if($stop!=1)
{
// 判断是否已经创建
$shm_id = @shmop_open(0xff3, "a", 0644, 100);
if($shm_id) {
echo "内存块已经创建\n";
exit();
}
// 创建 100 字节的系统标识为 0xff3 的共享内存块
$shm_id = @shmop_open(0xff3, "c", 0644, 100);
if(!$shm_id) {
echo "共享内存块创建失败\n";
}

// 写一些内容
for($i=0;$i<10;$i++)
{
$shm_bytes_written = shmop_write($shm_id, "共享块$i", ($i*10));
}
echo "创建成功";
shmop_close($shm_id);
}
else
{
// 是否存在
$shm_id = @shmop_open(0xff3, "a", 0644, 100);
if(!$shm_id) {
echo "没有找到共享内存块\n";
exit();
}
// 删除
if(!shmop_delete($shm_id)) {
echo "删除失败.";
}
shmop_close($shm_id);
echo "内存块删除完毕!";
}
?>

<?php

// 打开共享内存块 0xff3
$shm_id = @shmop_open(0xff3, "a", 0644, 100);
if(!$shm_id) {
echo "不能打开共享内存块\n";
exit();
}

// 读出里面的内容
$my_string = shmop_read($shm_id, 0, $shm_size);
if(!$my_string) {
echo "没有内容或者不能读\n";
}
echo $my_string."\n";
shmop_close($shm_id);
?>

?php
$shm_id = shmop_open(0x00000001, "c", 0644, 4);     //通过一个指定的key来打开一个共享内存，
                                                    //这个key可以是自己指定，也可以用ftok生成
$data = unpack('Ncount',shmop_read($shm_id, 0, 4)); //解包数据
$count = $data['count']+1;                          //加一
shmop_write($shm_id, pack('N',$count), 0);          //打包数据
shmop_close($shm_id);                               //关闭共享内存
echo $count;                                        //输出数字
exit(0);                                            //退出
?>

[root@localhost html]# ipcs -m

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status    
0x00000001 262144     root      644        4          0                      

[root@localhost html]#

[root@localhost html]# ipcrm -M 0x00000001
[root@localhost html]# ipcs -m

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status    

[root@localhost html]#

nm -D /lib/libc.so.6 | grep log