NAME¶

pmem2_source_from_fd(), pmem2_source_delete() - creates or deletes an instance of persistent memory data source

SYNOPSIS¶

#include <libpmem2.h>
int pmem2_source_from_fd(struct pmem2_source *src, int fd);
int pmem2_source_delete(struct pmem2_source **src);
    

DESCRIPTION¶

The pmem2_source_from_fd() function validates the file descriptor and instantiates a new *struct pmem2_source** object describing the data source.

fd must be opened with O_RDONLY or O_RDWR mode.

If fd is invalid, then the function fails.

The pmem2_source_delete() function frees *src returned by pmem2_source_from_fd() and sets *src to NULL. If *src is NULL, no operation is performed.

RETURN VALUE¶

The pmem2_source_from_fd() function return 0 on success or a negative error code on failure.

The pmem2_source_delete() function always returns 0.

ERRORS¶

The pmem2_source_from_fd() function can fail with the following errors:

•

PMEM2_E_INVALID_FILE_HANDLE - fd is not an open and valid file descriptor.

•

PMEM2_E_INVALID_FILE_HANDLE - fd is opened in O_WRONLY mode.

•

PMEM2_E_INVALID_FILE_TYPE - fd points to a directory, block device, pipe, or socket.

•

PMEM2_E_INVALID_FILE_TYPE - fd points to a character device other than Device DAX.

The pmem2_source_from_fd() function can also return -ENOMEM in case of insufficient memory to allocate an instance of struct pmem2_source.

SEE ALSO¶

errno(3), pmem2_map_new(3), libpmem2(7) and <https://pmem.io>