## TrackerMinerFS

TrackerMinerFS — Abstract base class for filesystem miners

## Functions

GQuark | tracker_miner_fs_error_quark ()
TrackerIndexingTree * | tracker_miner_fs_get_indexing_tree ()
TrackerDataProvider * | tracker_miner_fs_get_data_provider ()
gdouble | tracker_miner_fs_get_throttle ()
gboolean | tracker_miner_fs_get_mtime_checking ()
gboolean | tracker_miner_fs_get_initial_crawling ()
void | tracker_miner_fs_set_throttle ()
void | tracker_miner_fs_set_mtime_checking ()
void | tracker_miner_fs_set_initial_crawling ()
void | tracker_miner_fs_add_directory_without_parent ()
void | tracker_miner_fs_directory_add ()
gboolean | tracker_miner_fs_directory_remove ()
gboolean | tracker_miner_fs_directory_remove_full ()
void | tracker_miner_fs_force_mtime_checking ()
void | tracker_miner_fs_check_file ()
void | tracker_miner_fs_check_file_with_priority ()
void | tracker_miner_fs_check_directory ()
void | tracker_miner_fs_check_directory_with_priority ()
void | tracker_miner_fs_force_recheck ()
void | tracker_miner_fs_writeback_file ()
void | tracker_miner_fs_writeback_notify ()
void | tracker_miner_fs_file_notify ()
const gchar * | tracker_miner_fs_get_urn ()
const gchar * | tracker_miner_fs_get_parent_urn ()
gchar * | tracker_miner_fs_query_urn ()
gboolean | tracker_miner_fs_has_items_to_process ()

## Properties

TrackerDataProvider * | data-provider | Read / Write / Construct Only
gboolean | initial-crawling | Read / Write
gboolean | mtime-checking | Read / Write / Construct
guint | processing-pool-ready-limit | Read / Write / Construct
guint | processing-pool-wait-limit | Read / Write / Construct
GFile * | root | Read / Write / Construct Only
gdouble | throttle | Read / Write

## Signals

void | finished | Run Last
void | finished-root | Run Last
gboolean | ignore-next-update-file | Run Last
gboolean | process-file | Run Last
gboolean | process-file-attributes | Run Last
gboolean | writeback-file | Run Last

## Types and Values

struct | TrackerMinerFS
| TrackerMinerFSClass
enum | TrackerMinerFSError

## Object Hierarchy

        GObject
        ╰── TrackerMiner
            ╰── TrackerMinerFS

## Implemented Interfaces

TrackerMinerFS implements GInitable.

## Includes

    #include <libtracker-miner/tracker-miner.h>

## Description

TrackerMinerFS is an abstract base class for miners that collect data from a filesystem where parent/child relationships need to be inserted into the database correctly with queue management.

All the filesystem crawling and monitoring is abstracted away, leaving to implementations the decisions of what directories/files should it process, and the actual data extraction.

Example creating a TrackerMinerFS with our own file system root and data provider.

First create our class and base it on TrackerMinerFS:

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    G_DEFINE_TYPE_WITH_CODE (MyMinerFiles, my_miner_files, TRACKER_TYPE_MINER_FS,
                             G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
                                                    my_miner_files_initable_iface_init))

Later in our class creation function, we are supplying the arguments we want. In this case, the 'root' is a GFile pointing to a root URI location (for example 'file:///') and 'data_provider' is a TrackerDataProvider used to enumerate 'root' and return children it finds. If 'data_provider' is `NULL` (the default), then a TrackerFileDataProvider is created automatically.

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    // Note that only 'name' is mandatory
    miner = g_initable_new (MY_TYPE_MINER_FILES,
                            NULL,
                            error,
                            "name", "MyMinerFiles",
                            "root", root,
                            "data-provider", data_provider,
                            "processing-pool-wait-limit", 10,
                            "processing-pool-ready-limit", 100,
                            NULL);

## Functions

### tracker_miner_fs_error_quark ()

    GQuark
    tracker_miner_fs_error_quark (void);

Gives the caller the GQuark used to identify TrackerMinerFS errors in GError structures. The GQuark is used as the domain for the error.

#### Returns

the GQuark used for the domain of a GError.

Since: 1.2.

### tracker_miner_fs_get_indexing_tree ()

    TrackerIndexingTree *
    tracker_miner_fs_get_indexing_tree (TrackerMinerFS *fs);

Returns the TrackerIndexingTree which determines what files/directories are indexed by `fs`

#### Parameters

fs | a TrackerMinerFS |

#### Returns

The TrackerIndexingTree holding the indexing configuration.

[transfer none]

### tracker_miner_fs_get_data_provider ()

    TrackerDataProvider *
    tracker_miner_fs_get_data_provider (TrackerMinerFS *fs);

Returns the TrackerDataProvider implementation, which is being used to supply GFile and GFileInfo content to Tracker.

#### Parameters

fs | a TrackerMinerFS |

#### Returns

The TrackerDataProvider supplying content.

[transfer none]

Since: 1.2

### tracker_miner_fs_get_throttle ()

    gdouble
    tracker_miner_fs_get_throttle (TrackerMinerFS *fs);

Gets the current throttle value, see `tracker_miner_fs_set_throttle()` for more details.

#### Parameters

fs | a TrackerMinerFS |

#### Returns

a double representing a value between 0.0 and 1.0.

Since: 0.8

### tracker_miner_fs_get_mtime_checking ()

    gboolean
    tracker_miner_fs_get_mtime_checking (TrackerMinerFS *fs);

Returns a boolean used to identify if file modification time checks are performed when processing content. This may be set to `FALSE` if working prodominently with cloud data where you can't perform these checks. By default and for local file systems, this is enabled.

#### Parameters

fs | a TrackerMinerFS |

#### Returns

`TRUE` if mtime checks for directories against the database are done when `fs` crawls the file system, otherwise `FALSE`.

Since: 0.10

### tracker_miner_fs_get_initial_crawling ()

    gboolean
    tracker_miner_fs_get_initial_crawling (TrackerMinerFS *fs);

Returns a boolean which indicates if the indexing tree is crawled upon start up or not. This may be set to `FALSE` if working prodominently with cloud data where you can't perform these checks. By default and for local file systems, this is enabled.

#### Parameters

fs | a TrackerMinerFS |

#### Returns

`TRUE` if a file system structure is crawled for new updates on start up, otherwise `FALSE`.

Since: 0.10

### tracker_miner_fs_set_throttle ()

    void
    tracker_miner_fs_set_throttle (TrackerMinerFS *fs,
                                   gdouble throttle);

Tells the filesystem miner to throttle its operations. A value of 0.0 means no throttling at all, so the miner will perform operations at full speed, 1.0 is the slowest value. With a value of 1.0, the `fs` is typically waiting one full second before handling the next batch of queued items to be processed.

#### Parameters

fs | a TrackerMinerFS |
throttle | a double between 0.0 and 1.0 |

Since: 0.8

### tracker_miner_fs_set_mtime_checking ()

    void
    tracker_miner_fs_set_mtime_checking (TrackerMinerFS *fs,
                                         gboolean mtime_checking);

Tells the miner-fs that during the crawling phase, directory mtime checks should or shouldn't be performed against the database to make sure we have the most up to date version of the file being checked at the time. Setting this to FALSE can dramatically improve the start up the crawling of the `fs` .

The down side is that using this consistently means that some files on the disk may be out of date with files in the database.

The main purpose of this function is for systems where a `fs` is running the entire time and where it is very unlikely that a file could be changed outside between startup and shutdown of the process using this API.

The default if not set directly is that `mtime_checking` is `TRUE`.

#### Parameters

fs | a TrackerMinerFS |
mtime_checking | a gboolean |

Since: 0.10

### tracker_miner_fs_set_initial_crawling ()

    void
    tracker_miner_fs_set_initial_crawling (TrackerMinerFS *fs,
                                           gboolean do_initial_crawling);

Tells the `fs` that crawling the TrackerIndexingTree should happen initially. This is actually required to set up file system monitor using technologies like inotify, etc.

Setting this to FALSE can dramatically improve the start up the crawling of the `fs` .

The down side is that using this consistently means that some files on the disk may be out of date with files in the database.

The main purpose of this function is for systems where a `fs` is running the entire time and where it is very unlikely that a file could be changed outside between startup and shutdown of the process using this API.

The default if not set directly is that `do_initial_crawling` is `TRUE`.

#### Parameters

fs | a TrackerMinerFS |
do_initial_crawling | a gboolean |

Since: 0.10

### tracker_miner_fs_add_directory_without_parent ()

    void
    tracker_miner_fs_add_directory_without_parent
                                   (TrackerMinerFS *fs,
                                    GFile *file);

`tracker_miner_fs_add_directory_without_parent` is deprecated and should not be used in newly-written code.

Tells the miner-fs that the given GFile corresponds to a directory which was created in the store without a specific parent object. In this case, when regenerating internal caches, an extra query will be done so that these elements are taken into account.

#### Parameters

fs | a TrackerMinerFS |
file | a GFile |

Since: 0.10

### tracker_miner_fs_directory_add ()

    void
    tracker_miner_fs_directory_add (TrackerMinerFS *fs,
                                    GFile *file,
                                    gboolean recurse);

Tells the filesystem miner to inspect a directory.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the directory to inspect |
recurse | whether the directory should be inspected recursively |

Since: 0.8

### tracker_miner_fs_directory_remove ()

    gboolean
    tracker_miner_fs_directory_remove (TrackerMinerFS *fs,
                                       GFile *file);

Removes a directory from being inspected by `fs` . Note that only directory watches are removed.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the directory to be removed |

#### Returns

`TRUE` if the directory was successfully removed.

Since: 0.8

### tracker_miner_fs_directory_remove_full ()

    gboolean
    tracker_miner_fs_directory_remove_full
                                   (TrackerMinerFS *fs,
                                    GFile *file);

Removes a directory from being inspected by `fs` , and removes all associated metadata of the directory (and its contents) from the store.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the directory to be removed |

#### Returns

`TRUE` if the directory was successfully removed.

Since: 0.10

### tracker_miner_fs_force_mtime_checking ()

    void
    tracker_miner_fs_force_mtime_checking (TrackerMinerFS *fs,
                                           GFile *directory);

Tells `fs` to force mtime checking (regardless of the global mtime check configuration) on the given `directory` .

#### Parameters

fs | a TrackerMinerFS |
directory | a GFile representing the directory |

Since: 0.12

### tracker_miner_fs_check_file ()

    void
    tracker_miner_fs_check_file (TrackerMinerFS *fs,
                                 GFile *file,
                                 gboolean check_parents);

Tells the filesystem miner to check and index a file, this file must be part of the usual crawling directories of TrackerMinerFS. See `tracker_miner_fs_directory_add()`.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the file to check |
check_parents | whether to check parents and eligibility or not |

Since: 0.10

### tracker_miner_fs_check_file_with_priority ()

    void
    tracker_miner_fs_check_file_with_priority
                                   (TrackerMinerFS *fs,
                                    GFile *file,
                                    gint priority,
                                    gboolean check_parents);

Tells the filesystem miner to check and index a file at a given priority, this file must be part of the usual crawling directories of TrackerMinerFS. See `tracker_miner_fs_directory_add()`.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the file to check |
priority | the priority of the check task |
check_parents | whether to check parents and eligibility or not |

Since: 0.10

### tracker_miner_fs_check_directory ()

    void
    tracker_miner_fs_check_directory (TrackerMinerFS *fs,
                                      GFile *file,
                                      gboolean check_parents);

Tells the filesystem miner to check and index a directory, this file must be part of the usual crawling directories of TrackerMinerFS. See `tracker_miner_fs_directory_add()`.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the directory to check |
check_parents | whether to check parents and eligibility or not |

Since: 0.10

### tracker_miner_fs_check_directory_with_priority ()

    void
    tracker_miner_fs_check_directory_with_priority
                                   (TrackerMinerFS *fs,
                                    GFile *file,
                                    gint priority,
                                    gboolean check_parents);

Tells the filesystem miner to check and index a directory at a given priority, this file must be part of the usual crawling directories of TrackerMinerFS. See `tracker_miner_fs_directory_add()`.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the directory to check |
priority | the priority of the check task |
check_parents | whether to check parents and eligibility or not |

Since: 0.10

### tracker_miner_fs_force_recheck ()

    void
    tracker_miner_fs_force_recheck (TrackerMinerFS *fs);

### tracker_miner_fs_writeback_file ()

    void
    tracker_miner_fs_writeback_file (TrackerMinerFS *fs,
                                     GFile *file,
                                     GStrv rdf_types,
                                     GPtrArray *results);

Tells the filesystem miner to writeback a file.

#### Parameters

fs | a TrackerMinerFS |
file | GFile for the file to check |
rdf_types | A GStrv with rdf types |
results | A array of results from the preparation query. | [element-type GStrv]

Since: 0.10.20

### tracker_miner_fs_writeback_notify ()

    void
    tracker_miner_fs_writeback_notify (TrackerMinerFS *fs,
                                       GFile *file,
                                       const GError *error);

Notifies `fs` that all writing back on `file` has been finished, if any error happened during file data processing, it should be passed in `error` , else that parameter will contain `NULL` to reflect success.

#### Parameters

fs | a TrackerMinerFS |
file | a GFile |
error | a GError with the error that happened during processing, or `NULL`. |

Since: 0.10.20

### tracker_miner_fs_file_notify ()

    void
    tracker_miner_fs_file_notify (TrackerMinerFS *fs,
                                  GFile *file,
                                  const GError *error);

Notifies `fs` that all processing on `file` has been finished, if any error happened during file data processing, it should be passed in `error` , else that parameter will contain `NULL` to reflect success.

#### Parameters

fs | a TrackerMinerFS |
file | a GFile |
error | a GError with the error that happened during processing, or `NULL`. |

Since: 0.8

### tracker_miner_fs_get_urn ()

    const gchar *
    tracker_miner_fs_get_urn (TrackerMinerFS *fs,
                              GFile *file);

If the item exists in the store, this function retrieves the URN for a GFile being currently processed.

If `file` is not being currently processed by `fs` , or doesn't exist in the store yet, `NULL` will be returned.

#### Parameters

fs | a TrackerMinerFS |
file | a GFile obtained in “process-file” |

#### Returns

The URN containing the data associated to `file` , or `NULL`.

[transfer none][nullable]

Since: 0.8

### tracker_miner_fs_get_parent_urn ()

    const gchar *
    tracker_miner_fs_get_parent_urn (TrackerMinerFS *fs,
                                     GFile *file);

If `file` is currently being processed by `fs` , this function will return the parent folder URN if any. This function is useful to set the nie:belongsToContainer relationship. The processing order of TrackerMinerFS guarantees that a folder has been already fully processed for indexing before any children is processed, so most usually this function should return non-`NULL`.

#### Parameters

fs | a TrackerMinerFS |
file | a GFile obtained in “process-file” |

#### Returns

The parent folder URN, or `NULL`.

[transfer none][nullable]

Since: 0.8

### tracker_miner_fs_query_urn ()

    gchar *
    tracker_miner_fs_query_urn (TrackerMinerFS *fs,
                                GFile *file);

If the item exists in the store, this function retrieves the URN of the given GFile

If `file` doesn't exist in the store yet, `NULL` will be returned.

#### Parameters

fs | a TrackerMinerFS |
file | a GFile |

#### Returns

A newly allocated string with the URN containing the data associated to `file` , or `NULL`.

[transfer full]

Since: 0.10

### tracker_miner_fs_has_items_to_process ()

    gboolean
    tracker_miner_fs_has_items_to_process (TrackerMinerFS *fs);

The `fs` keeps many priority queus for content it is processing. This function returns `TRUE` if the sum of all (or any) priority queues is more than 0. This includes items deleted, created, updated, moved or being written back.

#### Parameters

fs | a TrackerMinerFS |

#### Returns

`TRUE` if there are items to process in the internal queues, otherwise `FALSE`.

Since: 0.10

## Types and Values

### struct TrackerMinerFS

    struct TrackerMinerFS;

Abstract miner implementation to get data from the filesystem.

### TrackerMinerFSClass

    typedef struct {
    	TrackerMinerClass parent;

    	gboolean (* process_file)             (TrackerMinerFS       *fs,
    	                                       GFile                *file,
    	                                       TrackerSparqlBuilder *builder,
    	                                       GCancellable         *cancellable);
    	gboolean (* ignore_next_update_file)  (TrackerMinerFS       *fs,
    	                                       GFile                *file,
    	                                       TrackerSparqlBuilder *builder,
    	                                       GCancellable         *cancellable);
    	void     (* finished)                 (TrackerMinerFS       *fs,
    	                                       gdouble               elapsed,
    	                                       gint                  directories_found,
    	                                       gint                  directories_ignored,
    	                                       gint                  files_found,
    	                                       gint                  files_ignored);
    	gboolean (* process_file_attributes)  (TrackerMinerFS       *fs,
    	                                       GFile                *file,
    	                                       TrackerSparqlBuilder *builder,
    	                                       GCancellable         *cancellable);
    	gboolean (* writeback_file)           (TrackerMinerFS       *fs,
    	                                       GFile                *file,
    	                                       GStrv                 rdf_types,
    	                                       GPtrArray            *results);
    	void     (* finished_root)            (TrackerMinerFS       *fs,
    	                                       GFile                *root,
    	                                       gint                  directories_found,
    	                                       gint                  directories_ignored,
    	                                       gint                  files_found,
    	                                       gint                  files_ignored);

    	/* <Private> */
    	gpointer padding[9];
    } TrackerMinerFSClass;

Prototype for the abstract class, `process_file` must be implemented in the deriving class in order to actually extract data.

#### Members

TrackerMinerClass `parent`; | parent object class |
`process_file` () | Called when the metadata associated to a file is requested. |
`ignore_next_update_file` () | Called after a writeback event happens on a file (deprecated since 0.12). |
`finished` () | Called when all processing has been performed. |
`process_file_attributes` () | Called when the metadata associated with a file's attributes changes, for example, the mtime. |
`writeback_file` () | Called when a file must be written back |
`finished_root` () | Called when all resources on a particular root URI have been processed. |
gpointer `padding`[9]; | Reserved for future API improvements. |

### enum TrackerMinerFSError

Possible errors returned when calling creating new objects based on the TrackerMinerFS type and other APIs available with this class.

#### Members

TRACKER_MINER_FS_ERROR_INIT | There was an error during initialization of the object. The specific details are in the message. |

Since: 1.2.

## Property Details

### The `“data-provider”` property

      “data-provider”            TrackerDataProvider *

Data provider populating data, e.g. like GFileEnumerator.

Flags: Read / Write / Construct Only

### The `“initial-crawling”` property

      “initial-crawling”         gboolean

Whether to perform initial crawling or not.

Flags: Read / Write

Default value: TRUE

### The `“mtime-checking”` property

      “mtime-checking”           gboolean

Whether to perform mtime checks during initial crawling or not.

Flags: Read / Write / Construct

Default value: TRUE

### The `“processing-pool-ready-limit”` property

      “processing-pool-ready-limit” guint

Maximum number of SPARQL updates that can be merged in a single connection to the store.

Flags: Read / Write / Construct

Allowed values: >= 1

Default value: 1

### The `“processing-pool-wait-limit”` property

      “processing-pool-wait-limit” guint

Maximum number of files that can be concurrently processed by the upper layer.

Flags: Read / Write / Construct

Allowed values: >= 1

Default value: 1

### The `“root”` property

      “root”                     GFile *

Top level URI for our indexing tree and file notify clases.

Flags: Read / Write / Construct Only

### The `“throttle”` property

      “throttle”                 gdouble

Modifier for the indexing speed, 0 is max speed.

Flags: Read / Write

Allowed values: [0,1]

Default value: 0

## Signal Details

### The `“finished”` signal

    void
    user_function (TrackerMinerFS *miner_fs,
                   gdouble         elapsed,
                   guint           directories_found,
                   guint           directories_ignored,
                   guint           files_found,
                   guint           files_ignored,
                   gpointer        user_data)

The ::finished signal is emitted when `miner_fs` has finished all pending processing.

#### Parameters

miner_fs | the TrackerMinerFS |
elapsed | elapsed time since mining was started |
directories_found | number of directories found |
directories_ignored | number of ignored directories |
files_found | number of files found |
files_ignored | number of ignored files |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since: 0.8

### The `“finished-root”` signal

    void
    user_function (TrackerMinerFS *miner_fs,
                   GFile          *file,
                   gpointer        user_data)

The ::finished-crawl signal is emitted when `miner_fs` has finished finding all resources that need to be indexed with the root location of `file` . At this point, it's likely many are still in the queue to be added to the database, but this gives some indication that a location is processed.

#### Parameters

miner_fs | the TrackerMinerFS |
file | a GFile |
user_data | user data set when the signal handler was connected. |

Flags: Run Last

Since: 1.2

### The `“ignore-next-update-file”` signal

    gboolean
    user_function (TrackerMinerFS       *miner_fs,
                   GFile                *file,
                   TrackerSparqlBuilder *builder,
                   GCancellable         *cancellable,
                   gpointer              user_data)

The ::ignore-next-update-file signal is emitted whenever a file should be marked as to ignore on next update, and it's metadata prepared for that.

`builder` is the TrackerSparqlBuilder where all sparql updates to be performed for `file` will be appended.

`TrackerMinerFS::ignore-next-update-file` has been deprecated since version 0.12 and should not be used in newly-written code.

#### Parameters

miner_fs | the TrackerMinerFS |
file | a GFile |
builder | a TrackerSparqlBuilder |
cancellable | a GCancellable |
user_data | user data set when the signal handler was connected. |

#### Returns

`TRUE` on success `FALSE` on failure

Flags: Run Last

Since: 0.8

### The `“process-file”` signal

    gboolean
    user_function (TrackerMinerFS       *miner_fs,
                   GFile                *file,
                   TrackerSparqlBuilder *builder,
                   GCancellable         *cancellable,
                   gpointer              user_data)

The ::process-file signal is emitted whenever a file should be processed, and it's metadata extracted.

`builder` is the TrackerSparqlBuilder where all sparql updates to be performed for `file` will be appended.

This signal allows both synchronous and asynchronous extraction, in the synchronous case `cancellable` can be safely ignored. In either case, on successful metadata extraction, implementations must call `tracker_miner_fs_file_notify()` to indicate that processing has finished on `file` , so the miner can execute the SPARQL updates and continue processing other files.

#### Parameters

miner_fs | the TrackerMinerFS |
file | a GFile |
builder | a TrackerSparqlBuilder |
cancellable | a GCancellable |
user_data | user data set when the signal handler was connected. |

#### Returns

`TRUE` if the file is accepted for processing, `FALSE` if the file should be ignored.

Flags: Run Last

Since: 0.8

### The `“process-file-attributes”` signal

    gboolean
    user_function (TrackerMinerFS       *miner_fs,
                   GFile                *file,
                   TrackerSparqlBuilder *builder,
                   GCancellable         *cancellable,
                   gpointer              user_data)

The ::process-file-attributes signal is emitted whenever a file should be processed, but only the attribute-related metadata extracted.

`builder` is the TrackerSparqlBuilder where all sparql updates to be performed for `file` will be appended. For the properties being updated, the DELETE statements should be included as well.

This signal allows both synchronous and asynchronous extraction, in the synchronous case `cancellable` can be safely ignored. In either case, on successful metadata extraction, implementations must call `tracker_miner_fs_file_notify()` to indicate that processing has finished on `file` , so the miner can execute the SPARQL updates and continue processing other files.

#### Parameters

miner_fs | the TrackerMinerFS |
file | a GFile |
builder | a TrackerSparqlBuilder |
cancellable | a GCancellable |
user_data | user data set when the signal handler was connected. |

#### Returns

`TRUE` if the file is accepted for processing, `FALSE` if the file should be ignored.

Flags: Run Last

Since: 0.10

### The `“writeback-file”` signal

    gboolean
    user_function (TrackerMinerFS *miner_fs,
                   GFile          *file,
                   GStrv           rdf_types,
                   GPtrArray      *results,
                   GCancellable   *cancellable,
                   gpointer        user_data)

The ::writeback-file signal is emitted whenever a file must be written back

#### Parameters

miner_fs | the TrackerMinerFS |
file | a GFile |
rdf_types | the set of RDF types |
results | a set of results prepared by the preparation query. | [element-type GStrv]
cancellable | a GCancellable |
user_data | user data set when the signal handler was connected. |

#### Returns

`TRUE` on success, `FALSE` otherwise

Flags: Run Last

Since: 0.10.20