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() | PMDK Programmer's Manual | () |
NAME¶
pmem2_source_device_id() - returns the unique identifier of a device
SYNOPSIS¶
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#include <libpmem2.h> struct pmem2_source; int pmem2_source_device_id(const struct pmem2_source *source, char *id, size_t *len);
DESCRIPTION¶
The pmem2_source_device_id() function retrieves a unique identifier of all NVDIMMs backing the data source. This function has two operating modes:
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- if *id is NULL the function calculates a buffer length required for storing the identifier of the *source device and puts this length in *len The more hardware devices back the data source, the longer the length is.
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- if *id is not NULL it must point to a buffer of length *len provided by the previous call to this function. On success, pmem2_source_device_id() will store a unique identifier of all hardware devices backing the data source.
For details on how to use the unique identifier for detecting the unsafe shutdown please refer to libpmem2_unsafe_shutdown(7) manual page.
RETURN VALUE¶
The pmem2_source_device_id() function returns 0 on success. If the function fails, the *id and *len variables contents are left unmodified and a negative error code is returned.
ERRORS¶
The pmem2_source_device_id() can fail with the following errors:
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- PMEM2_E_BUFFER_TOO_SMALL - the provided buffer of length *len is too small to store the full identifier of the backing devices.
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- PMEM2_E_NOSUPP - the underlying platform does not expose hardware identification.
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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 ndctl_new(), while trying to initiate a new NDCTL library context.
SEE ALSO¶
fstat(2), errno(3), malloc(3), libpmem2_unsafe_shutdown(7), and <https://pmem.io>
2024-05-23 | PMDK - |