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NAME¶
pmem2_map_from_existing() - creates a pmem2_map object from an existing mapping
SYNOPSIS¶
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#include <libpmem2.h> int pmem2_map_from_existing(struct pmem2_map **map, const struct pmem2_source *src,
void *addr, size_t len, enum pmem2_granularity gran);
DESCRIPTION¶
The pmem2_map_from_existing() returns a new *struct pmem2_map for mapping provided by the user. This function allows usage of libpmem2(7) API without pmem2_map_new(3) for mapping file. Mapping is defined by addr and len. You have to specify underlying file as a src, and define granularity of this mapping. See pmem2_config_set_required_store_granularity(3) and libpmem2**(7) for more details.
For the pmem2_map object created by the pmem2_map_from_existing(3) function, the pmem2_map_delete(3) will only destroy the object, but it won’t unmap the mapping this object describes.
RETURN VALUE¶
The pmem2_map_from_existing() function returns 0 when it succeeds or a negative error code on failure.
ERRORS¶
The pmem2_map_from_existing() can fail with the following errors:
PMEM2_E_MAPPING_EXISTS - when contiguous region (addr, addr + len) is already registered by libpmem2
It can also return -ENOMEM from the underlying malloc(2) function.
SEE ALSO¶
malloc(2), pmem2_map_delete(3), pmem2_map_new(3), pmem2_source_from_fd(3), libpmem2(7) and <https://pmem.io>
2024-05-23 | PMDK - |