permissions Class Reference

Static Public Member Functions
static bool	setFilePermissions (const char *filename, mode_t perms)
static bool	setFilePermissions (int32_t fd, mode_t perms)
static mode_t	parsePermString (const char *permstring)
static char *	parsePermOctal (mode_t mode)
static mode_t	getEveryoneReadWrite ()
static mode_t	getEveryoneReadWriteExecute ()
static mode_t	getOwnerRead ()
static mode_t	getOwnerWrite ()
static mode_t	getOwnerExecute ()
static mode_t	getOwnerReadWrite ()
static mode_t	getOwnerReadExecute ()
static mode_t	getOwnerReadWriteExecute ()
static mode_t	getGroupRead ()
static mode_t	getGroupWrite ()
static mode_t	getGroupExecute ()
static mode_t	getGroupReadWrite ()
static mode_t	getGroupReadExecute ()
static mode_t	getGroupReadWriteExecute ()
static mode_t	getOthersRead ()
static mode_t	getOthersWrite ()
static mode_t	getOthersExecute ()
static mode_t	getOthersReadWrite ()
static mode_t	getOthersReadExecute ()
static mode_t	getOthersReadWriteExecute ()
static mode_t	getSaveInSwapSpace ()
static mode_t	getSetUserId ()
static mode_t	getSetGroupId ()

Detailed Description

Permissions are access priveleges. Files, directories, semaphores and shared memory segments all have permissions associated with them.

There are 3 types of permissions: read, write and execute.

These permissions can be granted to:

1. The user that owns the object.
2. Other users in the group of the user that owns the object.
3. All other users.

The execute permission has 2 modifications which can be applied to it:

1. Set user id - the program will run as the user that owns it instead of as the user that ran it

1. Set group id - the program will run as the group that owns it instead of as the group of the user that ran it

The "sticky bit" may also be set on platforms that support it. When set, the file is saved in the system's swap space. As a side-effect, it cannot be deleted by a user other than the one that created it.

Member Function Documentation

getEveryoneReadWrite()

static mode_t permissions::getEveryoneReadWrite ( )

static

Returns rw-rw-rw- (666) permissions.

May be or'ed together with the result of another method to define a permission.

getEveryoneReadWriteExecute()

static mode_t permissions::getEveryoneReadWriteExecute ( )

static

Returns rwxrwxrwx (777) permissions.

May be or'ed together with the result of another method to define a permission.

getGroupExecute()

static mode_t permissions::getGroupExecute ( )

static

Returns --—x— (010) permissions.

May be or'ed together with the result of another method to define a permission.

getGroupRead()

static mode_t permissions::getGroupRead ( )

static

Returns —r--— (040) permissions.

May be or'ed together with the result of another method to define a permission.

getGroupReadExecute()

static mode_t permissions::getGroupReadExecute ( )

static

Returns —r-x— (050) permissions.

May be or'ed together with the result of another method to define a permission.

getGroupReadWrite()

static mode_t permissions::getGroupReadWrite ( )

static

Returns —rw-— (060) permissions.

May be or'ed together with the result of another method to define a permission.

getGroupReadWriteExecute()

static mode_t permissions::getGroupReadWriteExecute ( )

static

Returns —rwx— (070) permissions.

May be or'ed together with the result of another method to define a permission.

getGroupWrite()

static mode_t permissions::getGroupWrite ( )

static

Returns -—w-— (020) permissions.

May be or'ed together with the result of another method to define a permission.

getOthersExecute()

static mode_t permissions::getOthersExecute ( )

static

Returns -----—x (001) permissions.

May be or'ed together with the result of another method to define a permission.

getOthersRead()

static mode_t permissions::getOthersRead ( )

static

Returns ---—r– (004) permissions.

May be or'ed together with the result of another method to define a permission.

getOthersReadExecute()

static mode_t permissions::getOthersReadExecute ( )

static

Returns ---—r-x (005) permissions.

May be or'ed together with the result of another method to define a permission.

getOthersReadWrite()

static mode_t permissions::getOthersReadWrite ( )

static

Returns ---—rw- (006) permissions.

May be or'ed together with the result of another method to define a permission.

getOthersReadWriteExecute()

static mode_t permissions::getOthersReadWriteExecute ( )

static

Returns ---—rwx (007) permissions.

May be or'ed together with the result of another method to define a permission.

getOthersWrite()

static mode_t permissions::getOthersWrite ( )

static

Returns ----—w- (002) permissions.

May be or'ed together with the result of another method to define a permission.

getOwnerExecute()

static mode_t permissions::getOwnerExecute ( )

static

Returns –x---— (100) permissions.

May be or'ed together with the result of another method to define a permission.

getOwnerRead()

static mode_t permissions::getOwnerRead ( )

static

Returns r-----— (400) permissions.

May be or'ed together with the result of another method to define a permission.

getOwnerReadExecute()

static mode_t permissions::getOwnerReadExecute ( )

static

Returns r-x---— (500) permissions.

May be or'ed together with the result of another method to define a permission.

getOwnerReadWrite()

static mode_t permissions::getOwnerReadWrite ( )

static

Returns rw----— (600) permissions.

May be or'ed together with the result of another method to define a permission.

getOwnerReadWriteExecute()

static mode_t permissions::getOwnerReadWriteExecute ( )

static

Returns rwx---— (700) permissions.

May be or'ed together with the result of another method to define a permission.

getOwnerWrite()

static mode_t permissions::getOwnerWrite ( )

static

Returns -w----— (200) permissions.

May be or'ed together with the result of another method to define a permission.

getSaveInSwapSpace()

static mode_t permissions::getSaveInSwapSpace ( )

static

Returns -----—t permissions.

May be or'ed together with the result of another method to define a permission.

getSetGroupId()

static mode_t permissions::getSetGroupId ( )

static

Returns --—s— (g+s) permissions.

May be or'ed together with the result of another method to define a permission.

getSetUserId()

static mode_t permissions::getSetUserId ( )

static

Returns –s---— (u+s) permissions.

May be or'ed together with the result of another method to define a permission.

parsePermOctal()

static char* permissions::parsePermOctal ( mode_t  mode )

static

The inverse of parsePermString(). Evaluates "mode" and returns a string representing the permissions.

parsePermString()

static mode_t permissions::parsePermString ( const char *  permstring )

static

Returns the permission defined in "permstring".

"permstring" should be the same format as displayed by the "ls -l" command.

The first 3 characters set permissions for the owner. The next 3 characters set permissions for the group. The next 3 characters set permissions for all others.

For example: rwxr-xr-x : read/execute for everyone and write for the owner rw-rw-r– : read for everyone and write for the owner and owner's group rw-r–r– : read for everyone and write for the owner rwsr-sr-x : read/execute for everyone, write for the owner and run as the user/group that owns the file rw-rw-rwt : read/write for everyone, and save the file in swap space

setFilePermissions() [1/2]

static bool permissions::setFilePermissions ( const char *  filename, mode_t  perms  )

static

Set the permissions on "filename" to "perms".

Returns true on success and false on failure.

setFilePermissions() [2/2]

static bool permissions::setFilePermissions ( int32_t  fd, mode_t  perms  )

static

Set the permissions on the file associated with file descriptor "fd" to "perms".

Returns true on success and false on failure.