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Full Discussion: perl: why the return valure of stat and lstat are the same?
Top Forums Shell Programming and Scripting perl: why the return valure of stat and lstat are the same? Post 21297 by gusla on Wednesday 15th of May 2002 12:37:12 AM
Old 05-15-2002
Data perl: why the return valure of stat and lstat are the same?
i tried to use stat to get the attributes of a file and a soft link. but the result i got from stat and lstat are the same.

say:
ln -s f1 soft1 (soft is a soft link , point to f1)

if i use > ls -il
shows the inode and modify time of soft1 and f1 are different.

but the modify time( or any other attributes) are the same (using perl script) even if i use lstat for soft1 and stat for f1.


could anyone tell me why?

here is my code:

my ($fileName) = shift;
open (FILEINFO, "$fileName") || die "$! can't open";

# get the attributes for the file and softlink
my(@fileAttributes) = stat(FILEINFO);
my(@linkAttributes) = lstat(FILEINFO);
close (FILEINFO);

# check if the link is soft link
if (-l $fileName)
{
$hashModifyTime{$fileName} = $linkAttributes[9];
print "^^^^^^$hashModifyTime{$fileName}\n";
}
else
{
# fileAttributes[9] contains the last modify time of the file
$hashModifyTime{$fileName} = $fileAttributes[9];
print "^^^^^^$hashModifyTime{$fileName}\n";
}
 

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LEARN ABOUT PHP

lstat

LSTAT(3)								 1								  LSTAT(3)

lstat - Gives information about a file or symbolic link

SYNOPSIS

       array lstat (string  $filename)

DESCRIPTION

	Gathers the statistics of the file or symbolic link named by $filename.

PARAMETERS

	      o $filename
		- Path to a file or a symbolic link.

RETURN VALUES

	See  the  manual  page	for stat(3) for information on the structure of the array that lstat(3) returns. This function is identical to the
       stat(3) function except that if the $filename parameter is a symbolic link, the status of the symbolic link is returned, not the status	of
       the file pointed to by the symbolic link.

EXAMPLES

       Example #1

	      Comparison of stat(3) and lstat(3)

	      <?php
	      symlink('uploads.php', 'uploads');

	      // Contrast information for uploads.php and uploads
	      array_diff(stat('uploads'), lstat('uploads'));
	      ?>

	      The above example will output something similar to:

	       Information that differs between the two files.

	      Array
	      (
		  [ino] => 97236376
		  [mode] => 33188
		  [size] => 34
		  [atime] => 1223580003
		  [mtime] => 1223581848
		  [ctime] => 1223581848
		  [blocks] => 8
	      )

ERRORS
/EXCEPTIONS
	Upon failure, an E_WARNING is emitted.

NOTES

       Note

	      The results of this function are cached. See clearstatcache(3) for more details.

       Tip

	      As  of  PHP  5.0.0,  this function can also be used with some URL wrappers. Refer to "Supported Protocols and Wrappers" to determine
	      which wrappers support stat(3) family of functionality.

SEE ALSO

       stat(3).

PHP Documentation Group 														  LSTAT(3)
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