1PMEM2_SOURCE_SIZE(3)       PMDK Programmer's Manual       PMEM2_SOURCE_SIZE(3)
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NAME

6       pmem2_source_size() - returns the size of the data source
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SYNOPSIS

9              #include <libpmem2.h>
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11              struct pmem2_source;
12              int pmem2_source_size(const struct pmem2_source *source, size_t *size);
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DESCRIPTION

15       The  pmem2_source_size()  function  retrieves  the  size of the file in
16       bytes pointed by file descriptor or handle stored  in  the  source  and
17       puts it in *size.
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19       This  function is a portable replacement for OS-specific APIs.  On Lin‐
20       ux, it hides the quirkiness of Device DAX size detection.
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RETURN VALUE

23       The pmem2_source_size() function returns 0 on success.  If the function
24       fails,  the *size variable is left unmodified and a negative error code
25       is returned.
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ERRORS

28       The pmem2_source_size() can fail with the following errors:
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30       On all systems:
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32       • PMEM2_E_INVALID_FILE_HANDLE - source contains an invalid file handle.
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34       On Windows:
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36       • PMEM2_E_INVALID_FILE_TYPE - handle points to a resource that is not a
37         regular file.
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39       On Linux:
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41       • PMEM2_E_INVALID_FILE_TYPE  -  file  descriptor points to a directory,
42         block device, pipe, or socket.
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44       • PMEM2_E_INVALID_FILE_TYPE - file descriptor points to a character de‐
45         vice other than Device DAX.
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47       • PMEM2_E_INVALID_SIZE_FORMAT  -  kernel  query for Device DAX size re‐
48         turned data in invalid format.
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50       • -errno set by failing fstat(2), while trying to validate the file de‐
51         scriptor.
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53       • -errno  set by failing realpath(3), while trying to determine whether
54         fd points to a Device DAX.
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56       • -errno set by failing open(2), while trying to determine Device DAX's
57         size.
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59       • -errno set by failing read(2), while trying to determine Device DAX's
60         size.
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62       • -errno set by failing strtoull(3), while trying to  determine  Device
63         DAX's size.
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65       On FreeBSD:
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67       • PMEM2_E_INVALID_FILE_TYPE  -  file  descriptor points to a directory,
68         block device, pipe, socket, or character device.
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70       • -errno set by failing fstat(2), while trying to validate the file de‐
71         scriptor.
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SEE ALSO

74       errno(3),   fstat(2),   realpath(3),   open(2),  read(2),  strtoull(3),
75       pmem2_config_new(3), libpmem2(7) and <https://pmem.io>
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79PMDK - pmem2 API version 1.0      2022-08-25              PMEM2_SOURCE_SIZE(3)
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