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Date: Mon, 24 Mar 2003 23:04:30 -0500 (EST)
From: Glenn Fowler <gsf@research.att.com>
Message-Id: <200303250404.XAA09833@raptor.research.att.com>
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References: <5.2.0.9.2.20030324153435.02db0e68@pop3.cris.com>
To: cygwin@cygwin.com
Subject: Re: How to decide the file type in Cygwin?
Cc: rrschulz@cris.com


some unix systems { linux bsd uwin } support the
<dirent.h> struct dirent d_type field

the dt_type values { DT_UNKNOWN DT_DIR DT_LNK } can be used to optimize
directory traversals that otherwise would have to stat() directory
entries to discover/count subdirectories

-- Glenn Fowler

On Mon, 24 Mar 2003 15:38:17 -0800 Randall R Schulz wrote:
> Yang,

> Unix file systems don't store the the type of a file system entity in 
> the directory entry used to access that entity, they stored in the 
> so-called "inode." Once you have a name, use the stat(2) system call to 
> get its inode information. From there you'll be able to determine what 
> kind of an entity it is. If you have a file descriptor, then fstat(2) 
> will do the same.

> Randall Schulz

> At 15:27 2003-03-24, Yang, Huaichen wrote:
> >I need to list all files in a folder (including sub-folder,
> >recursively), and I tried some sample codes in GNU C manual, as
> >follows:
> >
> >...
> >
> >The sample was working. Then I added some codes to check the
> >ep->d_type (the type of the file). If it was a directory, the
> >program would check the sub-folder recursively. However, I
> >encountered a compiler error. The property d_type was not defined
> >in the Cygwin header file dirent.h. It seems that we cannot
> >distinguish the files from the directories. Is that true? Doesn't
> >anybody have a good idea to do this?
> >
> >Thank you very much in adavance!


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