1File::stat(3pm) Perl Programmers Reference Guide File::stat(3pm)
2
6 File::stat - by-name interface to Perl's built-in stat() functions
7
9 use File::stat;
10 $st = stat($file) or die "No $file: $!";
11 if ( ($st->mode & 0111) && $st->nlink > 1) ) {
12 print "$file is executable with lotsa links\n";
13 }
14 if ( -x $st ) {
16 print "$file is executable\n";
17 }
18 use Fcntl "S_IRUSR";
20 if ( $st->cando(S_IRUSR, 1) ) {
21 print "My effective uid can read $file\n";
22 }
23 use File::stat qw(:FIELDS);
25 stat($file) or die "No $file: $!";
26 if ( ($st_mode & 0111) && ($st_nlink > 1) ) {
27 print "$file is executable with lotsa links\n";
28 }
29
31 This module's default exports override the core stat() and lstat()
32 functions, replacing them with versions that return "File::stat"
33 objects. This object has methods that return the similarly named
34 structure field name from the stat(2) function; namely, dev, ino, mode,
35 nlink, uid, gid, rdev, size, atime, mtime, ctime, blksize, and blocks.
36 As of version 1.02 (provided with perl 5.12) the object provides "-X"
38 overloading, so you can call filetest operators ("-f", "-x", and so on)
39 on it. It also provides a "->cando" method, called like
40 $st->cando( ACCESS, EFFECTIVE )
42 where ACCESS is one of "S_IRUSR", "S_IWUSR" or "S_IXUSR" from the Fcntl
44 module, and EFFECTIVE indicates whether to use effective (true) or real
45 (false) ids. The method interprets the "mode", "uid" and "gid" fields,
46 and returns whether or not the current process would be allowed the
47 specified access.
48 If you don't want to use the objects, you may import the "->cando"
50 method into your namespace as a regular function called "stat_cando".
51 This takes an arrayref containing the return values of "stat" or
52 "lstat" as its first argument, and interprets it for you.
53 You may also import all the structure fields directly into your
55 namespace as regular variables using the :FIELDS import tag. (Note
56 that this still overrides your stat() and lstat() functions.) Access
57 these fields as variables named with a preceding "st_" in front their
58 method names. Thus, "$stat_obj->dev()" corresponds to $st_dev if you
59 import the fields.
60 To access this functionality without the core overrides, pass the "use"
62 an empty import list, and then access function functions with their
63 full qualified names. On the other hand, the built-ins are still
64 available via the "CORE::" pseudo-package.
65
67 As of Perl 5.8.0 after using this module you cannot use the implicit $_
68 or the special filehandle "_" with stat() or lstat(), trying to do so
69 leads into strange errors. The workaround is for $_ to be explicit
70 my $stat_obj = stat $_;
72 and for "_" to explicitly populate the object using the unexported and
74 undocumented populate() function with CORE::stat():
75 my $stat_obj = File::stat::populate(CORE::stat(_));
77
79 -%s is not implemented on a File::stat object
80 The filetest operators "-t", "-T" and "-B" are not implemented, as
81 they require more information than just a stat buffer.
82
84 These can all be disabled with
85 no warnings "File::stat";
87 File::stat ignores use filetest 'access'
89 You have tried to use one of the "-rwxRWX" filetests with "use
90 filetest 'access'" in effect. "File::stat" will ignore the pragma,
91 and just use the information in the "mode" member as usual.
92 File::stat ignores VMS ACLs
94 VMS systems have a permissions structure that cannot be completely
95 represented in a stat buffer, and unlike on other systems the
96 builtin filetest operators respect this. The "File::stat"
97 overloads, however, do not, since the information required is not
98 available.
99
101 While this class is currently implemented using the Class::Struct
102 module to build a struct-like class, you shouldn't rely upon this.
103
105 Tom Christiansen
106perl v5.12.4 2011-06-07 File::stat(3pm)