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/*
* 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

<?php
/*
产生队列
*/
//用微秒生成队列文件名。因为会有多个队列，所以加了一个identifier来区分各个队列
function mt($identifier='default')
{
        return sprintf("%.6f.%s",strtok(microtime(),' ')+strtok(''),$identifier);
}

while(1) //实际中尽量不要while(1) 非要while(1)记得任务完成要break
{
        if(count(glob('./queue/*.identifier'))>=10) //队列最大长度，不限制的话硬盘可能会受不了哦。
        {
                sleep(1);//记住这里要sleep,否则队列满了cpu占用很高
                continue;
        }
        $url = 'www.'.time().'.com'; //随便举个例子，我用时间戳生成了一个网址
        echo "$url\r\n";
        $fp = fopen('./queue/'.mt('identifier'),'w');
        fwrite($fp,$url);
        fclose($fp);
        sleep(1);//这里不需要sleep，我sleep是因为我的任务太简单。
}
?>

<?php
/*
处理队列
*/

while(1) //实际程序最好不要while(1)如果while(1)，记得处理完任务要break
{
        if($queue = glob('./queue/*.identifier'))
        {
                $q = array_shift($queue);
                $url = file_get_contents($q);
                echo $url."\r\n";
                unlink($q);
        }
        sleep(1);//这里要不要sleep或sleep多久自己凭感觉来。
}
?>

yum install openldap openldap-devel nss_ldap openldap-clients openldap-servers

cd php-5.2.8/
./configure 省略参数 --with-ldap --with-ldap-sasl
make ZEND_EXTRA_LIBS='-liconv'
make install