дополнительные сопоставления ошибок sd-dbus (additional sd-dbus error mappings)
Имя (Name)
sd_bus_error_add_map, sd_bus_error_map, SD_BUS_ERROR_MAP,
SD_BUS_ERROR_END - Additional sd-dbus error mappings
Синопсис (Synopsis)
#include <systemd/sd-bus.h>
typedef struct {
const char *name;
int code;
...
} sd_bus_error_map;
SD_BUS_ERROR_MAP(name, code)
SD_BUS_ERROR_MAP_END
int sd_bus_error_add_map(const sd_bus_map *map);
Описание (Description)
The sd_bus_error_add_map() call may be used to register
additional mappings for converting D-Bus errors to Linux
errno-style errors. The mappings defined with this call are
consulted by calls such as sd_bus_error_set(3) or
sd_bus_error_get_errno(3). By default, a number of generic,
standardized mappings are known, as documented in
sd-bus-errors(3). Use this call to add further,
application-specific mappings.
The function takes a pointer to an array of sd_bus_error_map
structures. A reference to the specified array is added to the
lookup tables for error mappings. Note that the structure is not
copied, and that it is hence essential that the array stays
available and constant during the entire remaining runtime of the
process.
The mapping array should be put together with a series of
SD_BUS_ERROR_MAP() macro invocations that take a literal name
string and a (positive) errno-style error number. The last entry
of the array should be an invocation of the SD_BUS_ERROR_MAP_END
macro. The array should not be put together without use of these
two macros.
Note that the call is idempotent: it is safe to invoke it
multiple times with the parameter, which will only add the passed
mapping array once.
Note that the memory allocated by this call is not intended to be
freed during the lifetime of the process. It should not be freed
explicitly.
Возвращаемое значение (Return value)
sd_bus_error_add_map() returns a positive value when the new
array was added to the lookup tables. It returns zero when the
same array was already added before. On error, a negative
errno-style error code is returned. See below for known error
codes.
Errors
Returned errors may indicate the following problems:
-EINVAL
The specified mapping array is invalid.
-ENOMEM
Memory allocation failed.
Примечание (Note)
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
Смотри также (See also)
systemd(1), sd-bus(3), sd_bus_error(3), sd-bus-errors(3),
errno(3), strerror_r(3)
