understanding stat module names

David Bear david.bear at asu.edu
Thu Jan 19 02:24:23 CET 2006


Claudio Grondi wrote:

> David Bear wrote:
>> I'm trying to use os.chmod and am refered to the stat module.
>> 
>> Is there are explanation of:
>>     * S_ISUID
>>     * S_ISGID
>>     * S_ENFMT
>>     * S_ISVTX
>>     * S_IREAD
>>     * S_IWRITE
>>     * S_IEXEC
>>     * S_IRWXU
>>     * S_IRUSR
>>     * S_IWUSR
>>     * S_IXUSR
>>     * S_IRWXG
>>     * S_IRGRP
>>     * S_IWGRP
>>     * S_IXGRP
>>     * S_IRWXO
>>     * S_IROTH
>>     * S_IWOTH
>>     * S_IXOTH
>> 
>> this isn't much help:
>> 
>>  dir(stat)
>> ['ST_ATIME', 'ST_CTIME', 'ST_DEV', 'ST_GID', 'ST_INO', 'ST_MODE',
>> 'ST_MTIME', 'ST_NLINK', 'ST_SIZE', 'ST_UID', 'S_ENFMT', 'S_IEXEC',
>> 'S_IFBLK', 'S_IFCHR', 'S_IFDIR', 'S_IFIFO', 'S_IFLNK', 'S_IFMT',
>> 'S_IFREG', 'S_IFSOCK', 'S_IMODE', 'S_IREAD', 'S_IRGRP', 'S_IROTH',
>> 'S_IRUSR', 'S_IRWXG', 'S_IRWXO', 'S_IRWXU', 'S_ISBLK', 'S_ISCHR',
>> 'S_ISDIR', 'S_ISFIFO', 'S_ISGID', 'S_ISLNK', 'S_ISREG', 'S_ISSOCK',
>> 'S_ISUID', 'S_ISVTX', 'S_IWGRP', 'S_IWOTH', 'S_IWRITE', 'S_IWUSR',
>> 'S_IXGRP', 'S_IXOTH', 'S_IXUSR', '__builtins__', '__doc__', '__file__',
>> '__name__']
>> 
>>>>>print stat.__doc__
>> 
>> Constants/functions for interpreting results of os.stat() and os.lstat().
>> 
>> Suggested usage: from stat import *
>> 
>> 
>> 
>> 
> from stat.h of Microsoft Visual C++ .NET 2003:
> 
> #define _S_IFMT         0170000         /* file type mask */
> #define _S_IFDIR        0040000         /* directory */
> #define _S_IFCHR        0020000         /* character special */
> #define _S_IFIFO        0010000         /* pipe */
> #define _S_IFREG        0100000         /* regular */
> #define _S_IREAD        0000400         /* read permission, owner */
> #define _S_IWRITE       0000200         /* write permission, owner */
> #define _S_IEXEC        0000100         /* execute/search permission,
> owner */
> #define S_IFMT   _S_IFMT
> #define S_IFDIR  _S_IFDIR
> #define S_IFCHR  _S_IFCHR
> #define S_IFREG  _S_IFREG
> #define S_IREAD  _S_IREAD
> #define S_IWRITE _S_IWRITE
> #define S_IEXEC  _S_IEXEC
> 
> struct stat {
>          _dev_t st_dev;
>          _ino_t st_ino;
>          unsigned short st_mode;
>          short st_nlink;
>          short st_uid;
>          short st_gid;
>          _dev_t st_rdev;
>          _off_t st_size;
>          time_t st_atime;
>          time_t st_mtime;
>          time_t st_ctime;
>          };
> 
>  From MSDN Help:
> 
> The _fstat function obtains information about the open file associated
> with fd and stores it in the structure pointed to by buffer. The _stat
> structure, defined in SYS\STAT.H, contains the following fields:
> 
> st_atime
> Time of last file access.
> st_ctime
> Time of creation of file.
> st_dev
> If a device, fd; otherwise 0.
> st_mode
> Bit mask for file-mode information. The _S_IFCHR bit is set if fd refers
> to a device. The _S_IFREG bit is set if fd refers to an ordinary file.
> The read/write bits are set according to the file's permission mode.
> _S_IFCHR and other constants are defined in SYS\STAT.H.
> st_mtime
> Time of last modification of file.
> st_nlink
> Always 1 on non-NTFS file systems.
> st_rdev
> If a device, fd; otherwise 0.
> st_size
> Size of the file in bytes.
> 
> Probably googling for the constants will show up some more useful
> information , too.
> 
> Hope this helps.
> 
> Claudio

Thnks for the info. I didn't even think I would have to look in a unix/c ref
manual.  This was usefull.

 http://www.opengroup.org/onlinepubs/007908799/xsh/sysstat.h.html

-- 
David Bear
-- let me buy your intellectual property, I want to own your thoughts --



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