page_cache_prev_hole(9) [centos man page]

PAGE_CACHE_PREV_HOLE(9) 				    Memory Management in Linux					   PAGE_CACHE_PREV_HOLE(9)

NAME

       page_cache_prev_hole - find the prev hole (not-present entry)

SYNOPSIS

       pgoff_t page_cache_prev_hole(struct address_space * mapping, pgoff_t index, unsigned long max_scan);

ARGUMENTS

       mapping
	   mapping

       index
	   index

       max_scan
	   maximum range to search

DESCRIPTION

       Search backwards in the range [max(index-max_scan+1, 0), index] for the first hole.

RETURNS

       the index of the hole if found, otherwise returns an index outside of the set specified (in which case 'index - return >= max_scan' will be
       true). In rare cases of wrap-around, ULONG_MAX will be returned.

       page_cache_prev_hole may be called under rcu_read_lock. However, like radix_tree_gang_lookup, this will not atomically search a snapshot of
       the tree at a single point in time. For example, if a hole is created at index 10, then subsequently a hole is created at index 5,
       page_cache_prev_hole covering both indexes may return 5 if called under rcu_read_lock.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   PAGE_CACHE_PREV_HOLE(9)

xpc_array_create(3)					   BSD Library Functions Manual 				       xpc_array_create(3)

NAME

     xpc_array_create -- creation and management of XPC arrays

SYNOPSIS

     #include <xpc/xpc.h>

     xpc_object_t
     xpc_array_create(const xpc_object_t *objects, size_t count);

     void
     xpc_array_set_value(xpc_object_t array, size_t index, xpc_object_t value);

     void
     xpc_array_append_value(xpc_object_t array, xpc_object_t value);

     xpc_object_t
     xpc_array_get_value(xpc_object_t array, size_t index);

     size_t
     xpc_array_get_count(xpc_object_t array);

     bool
     xpc_array_apply(xpc_object_t array, xpc_array_applier_t applier);

     void
     xpc_array_set_bool(xpc_object_t array, size_t index, bool value);

     void
     xpc_array_set_int64(xpc_object_t array, size_t index, int64_t value);

     void
     xpc_array_set_uint64(xpc_object_t array, size_t index, uint64_t value);

     void
     xpc_array_set_double(xpc_object_t array, size_t index, double value);

     void
     xpc_array_set_date(xpc_object_t array, size_t index, int64_t value);

     void
     xpc_array_set_data(xpc_object_t array, size_t index, const void *bytes, size_t length);

     void
     xpc_array_set_string(xpc_object_t array, size_t index, const char *value);

     void
     xpc_array_set_uuid(xpc_object_t array, size_t index, const uuid_t value);

     void
     xpc_array_set_fd(xpc_object_t array, size_t index, int value);

     void
     xpc_array_set_connection(xpc_object_t array, size_t index, xpc_connection_t value);

     bool
     xpc_array_get_bool(xpc_object_t array, size_t index);

     int64_t
     xpc_array_get_int64(xpc_object_t array, size_t index);

     uint64_t
     xpc_array_get_uint64(xpc_object_t array, size_t index);

     double
     xpc_array_get_double(xpc_object_t array, size_t index);

     int64_t
     xpc_array_get_date(xpc_object_t array, size_t index);

     const void *
     xpc_array_get_data(xpc_object_t array, size_t index, size_t *length);

     const uint8_t *
     xpc_array_get_uuid(xpc_object_t array, size_t index);

     const char *
     xpc_array_get_string(xpc_object_t array, size_t index);

     int
     xpc_array_get_fd(xpc_object_t array, size_t index);

     xpc_connection_t
     xpc_array_get_connection(xpc_object_t array, size_t index);

ARRAYS

     XPC arrays are collections of XPC objects ordered by index. The index is zero-based. XPC arrays are contiguous, and values must exist at all
     indexes between zero and the greatest index of the array. A hole in the array can be simulated by using a null object as returned by
     xpc_null_create(3).

CREATION

     The xpc_array_create() function returns a newly created array. The caller may optionally provide objects, a C array of XPC object references,
     to initialize the array. The count is used to specify the size of the C array.  If objects is NULL, then count must be zero. If count speci-
     fies more elements than are actually present in values or if values is NULL and count is non-zero, the behavior is undefined.

GETTING AND SETTING VALUES

     The xpc_array_append_value() function may be used to append a value to the end of an array.  This operation increases the count of the values
     in the array by one.

     The value of a specific index in the array may be set using the xpc_array_set_value() function.  The value must be non-NULL, and the index
     must already exist (i.e. less than the count provided at creation or extended through previous append operations).

     The value at a specific index of an array may be retrieved using the xpc_array_get_value() function.  The result of getting a non-existing
     index (i.e. one that was not specified at creation or through a previous append operation) in undefined.

PRIMITIVE GET AND SET FUNCTIONS

     Various functions exist for retrieving primitive C and operating system types directly from an array without the need for an intermediate
     boxed object. See xpc_object(3) for more information.

     The special XPC_ARRAY_APPEND constant may be used to append a value to the end of the array instead of operating on a specific index.

SEE ALSO

     xpc_object(3), xpc_objects(3), xpc_dictionary_create(3)

Darwin								   1 July, 2011 							    Darwin