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<h1 id="title">FBB::Stat</h1>
<h2 id="author">libbobcat-dev_4.04.00-x.tar.gz</h2>
<h2 id="date">2005-2016</h2>
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<title>FBB::Stat(3bobcat)</title>
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<h1 id="title">FBB::Stat(3bobcat)</h1>
<h2 id="author">libbobcat-dev_4.04.00-x.tar.gz Characteristics of object in the filesystem</h2>
<h2 id="date">2005-2016</h2>
<p>
<h2 >NAME</h2>FBB::Stat - Determines File Characteristics
<p>
<h2 >SYNOPSIS</h2>
<strong >#include <bobcat/stat></strong><br/>
Linking option: <em >-lbobcat</em>
<p>
<h2 >DESCRIPTION</h2>
<strong >Stat</strong> is a wrapper around the <strong >stat</strong>(2) system function. In
particular, it offers features to test directly for object
characteristics offered by <strong >stat</strong>(2). To determine whether an object exists
the <em >Stat bool</em> conversion operator can be used.
<p>
<h2 >NAMESPACE</h2>
<strong >FBB</strong><br/>
All constructors, members, operators and manipulators, mentioned in this
man-page, are defined in the namespace <strong >FBB</strong>.
<p>
<h2 >INHERITS FROM</h2>
-
<p>
<h2 >ENUMERATIONS</h2>
<p>
<strong >Stat::Combine</strong>: <br/>
This enumeration defines the following values:
<ul>
<li> <strong >ALL</strong>: require all of the specified <strong >Mode</strong> or
<strong >SpecialMode</strong> values to match;
<li> <strong >ANY</strong>: require any match of the specified <strong >Mode</strong> or
<strong >SpecialMode</strong> values (one match suffices);
</ul>
<p>
<strong >Stat::Mode</strong>: <br/>
This enumeration defines the following values:
<ul>
<li> <strong >UR</strong>: the owner of the object has read permissions
<li> <strong >UW</strong>: the owner of the object has write permissions
<li> <strong >UX</strong>: the owner of the object has execute permissions
<li> <strong >GR</strong>: the group to which the object belongs has read permissions
<li> <strong >GW</strong>: the group to which the object belongs has write
permissions
<li> <strong >GX</strong>: the group to which the object belongs has execute
permissions
<li> <strong >OR</strong>: others have read permissions
<li> <strong >OW</strong>: others have write permissions
<li> <strong >OX</strong>: others have execute permissions
<li> <strong >READ</strong>: equal to <em >UR | GR | OR</em>
<li> <strong >WRITE</strong>: equal to <em >UW | GW | OW</em>
<li> <strong >EXEC</strong>: equal to <em >UX | GX | OX</em>
<li> <strong >RWX</strong>: all of the above.
</ul>
<p>
<strong >Stat::SpecialMode</strong>: <br/>
This enumeration defines the following values:
<ul>
<li> <strong >SUID</strong>: set UID bit is up
<li> <strong >SGID</strong>: set GID bit is up
<li> <strong >SB</strong>: sticky bit is up
</ul>
<p>
<strong >Stat::Type</strong>: <br/>
This enumeration, which is identical to the <strong >glob</strong>(3bobcat) <em >Type</em>
enumeration, defines the following values:
<ul>
<li> <strong >BLOCK_DEVICE</strong>: the object represents a block device
<li> <strong >CHARACTER_DEVICE</strong>: the object represents a character device
<li> <strong >DIRECTORY</strong>: the object represents a directory
<li> <strong >FIFO</strong>: the object represents a named pipe (a queue)
<li> <strong >REGULAR_FILE</strong>: the object represents a regular file
<li> <strong >SOCKET</strong>: the object represents a socket
<li> <strong >SYMBOLIC_LINK</strong>: the object represents a symbolic link
<li> <strong >ANY</strong>: any of the above types
</ul>
<p>
<h2 >CONSTRUCTORS</h2>
<ul>
<li> <strong >Stat()</strong>:<br/>
The default constructor, creating an empty <strong >Stat</strong> object.
<li> <strong >Stat(std::string const &fname)</strong>:<br/>
Initializes a <strong >Stat</strong> with a given object name.
<li> <strong >Stat(std::string const &fname, std::string const &searchPath)</strong>:<br/>
Initializes a <strong >Stat</strong> with a given object name, where the object is
searched in the <em >searchPath</em> directories, which is a colon-separated
string of directory names. The filenames are constructed by appending
<em >fname</em> to each of the elements of <em >searchPath</em> until an existing
object is found. This object is then used. If <em >fname</em> is an absolute
path, <em >searchPath</em> is ignored.
</ul>
The copy constructor is available.
<p>
<h2 >OVERLOADED OPERATORS</h2>
<ul>
<li> <strong >operator bool() const</strong>:<br/>
This operator returns <em >true</em> if the <em >Stat</em> object holds information
about an existing object. Otherwise <em >false</em> is returned.
</ul>
<p>
The default assignment operator is available.
<p>
<h2 >MEMBER FUNCTIONS</h2>
<ul>
<li> <strong >bool access(FBB::User const &user, size_t spec, bool useEffective =
true) const</strong>:<br/>
Returns <em >true</em> if <em >user</em> has the permissions as specified at
<em >spec</em> (of which only the defined <em >Mode</em> bits are interpreted). If
a combination of read, write and/or execute permissions are specified,
then at least one of the read permissions, one of the write
permissions and one of the execute permissions must be granted or the
function returns <em >false</em>. E.g, when specifying <em >access(user, UW |
UR | GR)</em> then the user <em >must</em> have write permissions, but either
the user or the user's group must have read permissions. If multiple
read, multiple write or multiple execute permissions are specified
(like <em >UR | GR</em>) then this member returns <em >true</em> if at least one
of the requested read, write, or execute permissions are granted for
<em >user</em>.
<li> <strong >size_t blockSize() const</strong>:<br/>
Returns the blocksize (<em >st_blksize</em>) for filesystem I/O
<li> <strong >size_t device() const</strong>:<br/>
Returns the device id (<em >st_dev</em>).
<li> <strong >size_t deviceType() const</strong>:<br/>
Returns the device type number, but only if the object type is
<strong >DEVICE</strong> (<em >st_rdev</em>).
<li> <strong >size_t error() const</strong>:<br/>
Returns the error number associated with an error, in cases where
<strong >operator bool()</strong> returns <strong >false</strong>. A returned value of 0 indicates
`no errors'.
<li> <strong >bool isType(Stat::Type probe)</strong>:<br/>
Returns <em >true</em> if the object has the probed type otherwise <em >false</em>
is returned.
<li> <strong >size_t inode() const</strong>:<br/>
Returns the inode number (<em >st_ino</em>).
<li> <strong >size_t gid() const</strong>:<br/>
Returns the group ID of the object's owner (<em >st_gid</em>).
<li> <strong >FBB::DateTime lastAccess() const</strong>:<br/>
Returns a <strong >FBB::DateTime</strong> object holding information about the
object's time of last access (<em >st_atime</em>) (using UTC).
<li> <strong >FBB::DateTime lastChange() const</strong>:<br/>
Returns a <strong >FBB::DateTime</strong> object holding information about the
object's time of last status change (<em >st_ctime</em>) (using UTC).
<li> <strong >FBB::DateTime lastModification() const</strong>:<br/>
Returns a <strong >FBB::DateTime</strong> object holding information about the
object's last modification time (<em >st_mtime</em>) (using UTC).
<li> <strong >size_t mode() const</strong>:<br/>
Returns the object's raw, uninterpreted mode (<em >st_mode & RWX</em>). Note
that this value is usually displayed (and is processed most easily) as
an octal value.
<li> <strong >bool mode(size_t mode, Combine combine = ALL)</strong>:<br/>
Returns true if the object has the indicated mode. Multiple modes may
be set, which can be combined by the logical <strong >bitor</strong> operator. By
default, if multiple modes are specified, the resulting pattern must
exactly represent the object's mode for the member function to return
<strong >true</strong>. An optional argument <em >ANY</em> may be specified if the
function should return true if at least one specified mode matches the
object's actual mode. An <em >Exception</em> exception is thrown if the
specified <em >mode</em> contains other values than the defined <strong >Mode</strong>
or <strong >SpecialMode</strong> values.
<li> <strong >std::string modeStr() const</strong>:<br/>
Returns the standard string-representation of the object's mode (e.g.,
<em >rw-r--r--</em>). Special modes (e.g., suid) are indicated by <em >s</em>
instead of <em >x</em> when the object is user and/or group executable and
by <em >S</em> if the object has the special mode bit(s) set, but is not
executable. For the `other' executable mode flag <em >t</em> is used
(`sticky' bit) and <em >T</em> if the object is not `other' executable.
<li> <strong >std::string const &name() const</strong>:<br/>
Returns the object's name as specified in the constructor or <strong >set()</strong>
member function.
<li> <strong >size_t nBlocks() const</strong>:<br/>
Returns the object's number of allocated blocks (<em >st_blocks</em>).
<li> <strong >size_t nLinks() const</strong>:<br/>
Returns the object's number of hard links (<em >st_nlink</em>).
<li> <strong >std::string path() const</strong>:<br/>
Returns the object's full pathname. If the full pathname could not be
determined, an empty string is returned.
<li> <strong >bool set(std::string const &name)</strong>:<br/>
Redefine the <strong >Stat</strong> object to represent the information about
the indicated object name.
<li> <strong >bool set(std::string const &name, std::string const &pathlist)</strong>:<br/>
Redefine the <strong >Stat</strong> object to represent the information about the
indicated object name, where the object is searched in the
<em >pathlist</em> directories, which is a colon-separated string of
directory names. The object names are constructed by appending
<em >fname</em> to each of the elements of <em >searchPath</em> until an existing
object is found. This object is then used. If <em >fname</em> is an absolute
path, <em >searchPath</em> is ignored.
<li> <strong >off_t size() const</strong>:<br/>
Returns the object's size in number of bytes (<em >st_size</em>).
<li> <strong >bool specialMode(size_t special, Combine combine = ALL)</strong>:<br/>
Returns true if the object has the indicated special modes. Multiple
special modes may be specified, which can be combined by the logical
<strong >bitor</strong> operator. By default, if multiple modes are specified, the
resulting pattern must exactly represent the object's mode for the
member function to return <strong >true</strong>. An optional argument <em >ANY</em> may
be specified if the function should return true if at least one
specified mode matches the object's actual mode. The non-special modes
are ignored but a <em >Exception</em> exception is thrown if <em >special</em>
contains other values than those defined by the <strong >SpecialMode</strong> enum.
<li> <strong >Stat::stat const &statStruct() const</strong>:<br/>
Returns a reference to the object's <strong >stat struct</strong>.
<li> <strong >Stat::Type type() const</strong>:<br/>
Returns the <em >Stat::Type</em> value of the object.
<li> <strong >std::string typeStr() const</strong>:<br/>
Returns a textual representation of the object's type as returned by
the <em >Stat::type()</em> member function.
<li> <strong >size_t uid() const</strong>:<br/>
Returns the user ID of the object's owner (<em >st_uid</em>).
</ul>
<p>
<h2 >EXAMPLE</h2>
<pre >
/*
driver.cc
*/
#include <iostream>
#include <string>
#include <bobcat/stat>
#include <bobcat/datetime>
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
{
if (argc == 1)
{
cout << "Usage: driver object [colon-separated searchpath]\n";
return 1;
}
Stat st;
if (argc == 2)
st.set(argv[1]);
else if (argc == 3)
st.set(argv[1], argv[2]);
if (!st)
{
cout << "Can't stat " << argv[1] << ", errno = " << st.error() << endl;
return 1;
}
cout << st.name() << ": access: " << st.lastAccess() << "\n" <<
st.name() << ": change: " << st.lastChange() << "\n" <<
st.name() << ": modif: " << st.lastModification() << "\n"
"Mode: " << oct << st.mode() << " (" << st.modeStr() << ")\n"
"Type: " << st.type() << " (" << st.typeStr() << ")\n"
"Full path: " << st.path() << endl;
return 0;
}
</pre>
<p>
<h2 >FILES</h2>
<em >bobcat/stat</em> - defines the class interface
<p>
<h2 >SEE ALSO</h2>
<strong >bobcat</strong>(7), <strong >glob</strong>(3bobcat), <strong >stat</strong>(2)
<p>
<h2 >BUGS</h2>
None Reported.
<p>
<h2 >DISTRIBUTION FILES</h2>
<ul>
<li> <em >bobcat_4.04.00-x.dsc</em>: detached signature;
<li> <em >bobcat_4.04.00-x.tar.gz</em>: source archive;
<li> <em >bobcat_4.04.00-x_i386.changes</em>: change log;
<li> <em >libbobcat1_4.04.00-x_*.deb</em>: debian package holding the
libraries;
<li> <em >libbobcat1-dev_4.04.00-x_*.deb</em>: debian package holding the
libraries, headers and manual pages;
<li> <em >http://sourceforge.net/projects/bobcat</em>: public archive location;
</ul>
<p>
<h2 >BOBCAT</h2>
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
<p>
<h2 >COPYRIGHT</h2>
This is free software, distributed under the terms of the
GNU General Public License (GPL).
<p>
<h2 >AUTHOR</h2>
Frank B. Brokken (<strong >f.b.brokken@rug.nl</strong>).
<p>
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