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NAME¶
pmem2_source_alignment() - returns data source alignment
SYNOPSIS¶
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#include <libpmem2.h> struct pmem2_source; int pmem2_source_alignment(const struct pmem2_source *source, size_t *alignment);
DESCRIPTION¶
The pmem2_source_alignment() function retrieves the alignment of offset and length needed for pmem2_map_new(3) to succeed. The alignment is stored in *alignment.
RETURN VALUE¶
The pmem2_source_alignment() function returns 0 on success. If the function fails, the *alignment variable is left unmodified and a negative error code is returned.
ERRORS¶
The pmem2_source_alignment() can fail with the following errors:
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- PMEM2_E_INVALID_ALIGNMENT_VALUE - operating system returned unexpected alignment value (eg. it is not a power of two).
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- PMEM2_E_INVALID_FILE_TYPE - file descriptor points to a character device other than Device DAX.
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- PMEM2_E_INVALID_ALIGNMENT_FORMAT - kernel query for Device DAX alignment returned data in invalid format.
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- -errno set by failing fstat(2), while trying to validate the file descriptor.
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- -errno set by failing realpath(3), while trying to determine whether fd points to a Device DAX.
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- -errno set by failing read(2), while trying to determine Device DAX’s alignment.
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- -errno set by failing strtoull(3), while trying to determine Device DAX’s alignment.
SEE ALSO¶
errno(3), fstat(2), realpath(3), read(2), strtoull(3), pmem2_config_new(3), pmem2_source_from_fd(3), libpmem2(7) and <https://pmem.io>
2024-05-23 | PMDK - |