Provided by: libbobcat-dev_6.03.02-2_amd64 
NAME
FBB::Stat - Determines File Characteristics
SYNOPSIS
#include <bobcat/stat>
Linking option: -lbobcat
DESCRIPTION
Stat is a wrapper around the stat(2) and lstat(2) system functions. In particular, it
offers features to test directly for object characteristics offered by these two
functions. To determine whether an object could properly be constructed use the Stat bool
conversion operator. If this operator returns false then no other member except for error
should be used.
NAMESPACE
FBB
All constructors, members, operators and manipulators, mentioned in this man-page, are
defined in the namespace FBB.
INHERITS FROM
-
ENUMERATIONS
Stat::Combine:
This enumeration defines the following values:
o ALL: require all of the specified Mode or SpecialMode values to match;
o ANY: require any match of the specified Mode or SpecialMode values (one match
suffices);
Stat::Mode:
This enumeration defines the following values:
o UR: the owner of the object has read permissions
o UW: the owner of the object has write permissions
o UX: the owner of the object has execute permissions
o GR: the group to which the object belongs has read permissions
o GW: the group to which the object belongs has write permissions
o GX: the group to which the object belongs has execute permissions
o OR: others have read permissions
o OW: others have write permissions
o OX: others have execute permissions
o READ: equal to UR | GR | OR
o WRITE: equal to UW | GW | OW
o EXEC: equal to UX | GX | OX
o RWX: all of the above.
Stat::SpecialMode:
This enumeration defines the following values:
o SUID: set UID bit is up
o SGID: set GID bit is up
o SB: sticky bit is up
Stat::Type:
This enumeration, which is identical to the glob(3bobcat) Type enumeration, defines the
following values:
o BLOCK_DEVICE (0060000): the object is a block device;
o CHARACTER_DEVICE (0020000): the object is a character device;
o DIRECTORY (0040000): the object is a directory;
o FIFO (0010000): the object is a named pipe (a queue);
o REGULAR_FILE (0100000): the object is a regular file;
o SOCKET (0140000): the object is a socket;
o SYMBOLIC_LINK (0120000): the object is a symbolic link;
o ANY: any of the above types.
Stat::Lstat:
This enumeration has one value: LStat, which can be specified by construtors and some
members when the Stat object should distinguish regular files and symbolic links (calling
lstat(2)) instead of considering symbolic links as regular files (using stat(2)).
Constructors and members that define Stat::Lstat parameters call lstat(2), thus
distinguishing symbolic links from regular files, while constructors and members that do
not define Stat::Lstat parameters use stat(2).
The return values of the members statStruct and type and typeStr (see below) only
distinguish symbolic links from regular files when the Stat::LStat argument has been used.
The constructors and member functions listed below for which [Stat::Lstat,] is specified
as first parameter may optionally specify the Stat::LStat argument.
CONSTRUCTORS
o Stat():
The default constructor, creating an empty Stat object. It’s mainly used as default
object when defining, e.g., vectors of Stat objects. As it doesn’t refer to an
existing file system entry its operator bool returns false;
o Stat([Stat::Lstat,] std::string const &fname):
Initializes a Stat with a given object name;
o Stat([Stat::Lstat,] std::string const &fname, std::string const &searchPath):
Initializes a Stat with a given object name, where the object is searched in the
searchPath directories, which is a colon-separated string of directory names. The
filenames are constructed by appending fname to each of the elements of searchPath
until an existing object is found. This object is then used. If fname is an
absolute path, searchPath is ignored.
Copy and move constructors (and assignment operators) are available.
OVERLOADED OPERATORS
o operator bool() const:
This operator returns true if the Stat object holds information about an existing
object. Otherwise false is returned. When false is returned other members, except
for the assignment operators, the error member, and the set members should not be
used.
MEMBER FUNCTIONS
o bool access(FBB::User const &user, size_t spec, bool useEffective = true) const:
Returns true if user has the permissions as specified at spec (of which only the
defined Mode 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 false. E.g, when specifying access(user, UW | UR | GR) then the
user must 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 UR | GR) then this member returns true if at least one of the
requested read, write, or execute permissions are granted for user.
o size_t blockSize() const:
Returns the blocksize (st_blksize) for filesystem I/O
o size_t device() const:
Returns the device id (st_dev).
o size_t deviceType() const:
Returns the device type number, but only if the object type is DEVICE (st_rdev).
o size_t error() const:
Returns the error number associated with an error, in cases where operator bool()
returns false. A returned value of 0 indicates `no errors’. To obtain a verbal
transcription of returned error numbers the Exception::errnodescr manipulator (cf.
exception(3bobcat)) can be used.
o bool isType(Stat::Type probe):
Returns true if the object has the probed type otherwise false is returned.
o size_t inode() const:
Returns the inode number (st_ino).
o size_t gid() const:
Returns the group ID of the object’s owner (st_gid).
o FBB::DateTime lastAccess() const:
Returns an FBB::DateTime object holding information about the object’s time of last
access (st_atime) (using UTC).
o FBB::DateTime lastChange() const:
Returns an FBB::DateTime object holding information about the object’s time of last
status change (st_ctime) (using UTC).
o FBB::DateTime lastModification() const:
Returns an FBB::DateTime object holding information about the object’s last
modification time (st_mtime) (using UTC).
o size_t mode() const:
Returns the object’s raw, uninterpreted mode (st_mode & RWX). Note that this value
is usually displayed (and is processed most easily) as an octal value.
o bool mode(size_t mode, Combine combine = ALL):
Returns true if the object has the indicated mode. Multiple modes may be set, which
can be combined by the logical bitor operator. By default, if multiple modes are
specified, the resulting pattern must exactly represent the object’s mode for the
member function to return true. An optional argument ANY may be specified if the
function should return true if at least one specified mode matches the object’s
actual mode. An Exception exception is thrown if the specified mode contains other
values than the defined Mode or SpecialMode values.
o std::string modeStr() const:
Returns the standard string-representation of the object’s mode (e.g., rw-r--r--).
Special modes (e.g., suid) are indicated by s instead of x when the object is user
and/or group executable and by S if the object has the special mode bit(s) set, but
is not executable. For the `other’ executable mode flag t is used (`sticky’ bit)
and T if the object is not `other’ executable.
o std::string const &name() const:
Returns the object’s name as specified in the constructor or set() member function.
o size_t nBlocks() const:
Returns the object’s number of allocated blocks (st_blocks).
o size_t nLinks() const:
Returns the object’s number of hard links (st_nlink).
o std::string path() const:
Returns the object’s full pathname. If the full pathname could not be determined,
an empty string is returned.
o bool set([Stat::Lstat,] std::string const &name):
Redefine the Stat object to represent the information about the indicated object
name.
o bool set([Stat::Lstat,] std::string const &name, std::string const &pathlist):
Redefine the Stat object to represent the information about the indicated object
name, where the object is searched in the pathlist directories, which is a
colon-separated string of directory names. The object names are constructed by
appending fname to each of the elements of searchPath until an existing object is
found. This object is then used. If fname is an absolute path, searchPath is
ignored.
o off_t size() const:
Returns the object’s size in number of bytes (st_size).
o bool specialMode(size_t special, Combine combine = ALL):
Returns true if the object has the indicated special modes. Multiple special modes
may be specified, which can be combined by the logical bitor operator. By default,
if multiple modes are specified, the resulting pattern must exactly represent the
object’s mode for the member function to return true. An optional argument ANY 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 Exception
exception is thrown if special contains other values than those defined by the
SpecialMode enum.
o Stat::stat const &statStruct() const:
Returns a reference to the object’s stat struct.
o Stat::Type type() const:
Returns the Stat::Type value of the object.
o std::string typeStr() const:
Returns a textual representation of the object’s type as returned by the
Stat::type() member function.
o size_t uid() const:
Returns the user ID of the object’s owner (st_uid).
EXAMPLE
/*
driver.cc
*/
#include <iostream>
#include <string>
#include "../stat"
#include <bobcat/datetime>
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
{
if (argc == 1)
{
cout << "Usage: driver [-l] object [colon-separated searchpath]\n";
return 1;
}
bool lstat = "-l"s == argv[1];
if (lstat)
{
++argv;
--argc;
}
Stat st;
if (argc == 2)
{
if (lstat)
st.set(Stat::LStat, argv[1]);
else
st.set(argv[1]);
}
else if (argc == 3)
{
if (lstat)
st.set(Stat::LStat, argv[1], argv[2]);
else
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;
}
FILES
bobcat/stat - defines the class interface
SEE ALSO
bobcat(7), glob(3bobcat), stat(2), lstat(2)
BUGS
None Reported.
BOBCAT PROJECT FILES
o https://fbb-git.gitlab.io/bobcat/: gitlab project page;
o bobcat_6.03.02-x.dsc: detached signature;
o bobcat_6.03.02-x.tar.gz: source archive;
o bobcat_6.03.02-x_i386.changes: change log;
o libbobcat1_6.03.02-x_*.deb: debian package containing the libraries;
o libbobcat1-dev_6.03.02-x_*.deb: debian package containing the libraries, headers
and manual pages;
BOBCAT
Bobcat is an acronym of `Brokken’s Own Base Classes And Templates’.
COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License
(GPL).
AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl).