#include <sys/fsext.h> void *__FSEXT_get_data(int _fd);
This function is part of the section File System Extensions. It is used
to retrieve a descriptor-specific pointer that was previously stored
by __FSEXT_set_data
(see section __FSEXT_set_data). The pointer is not
otherwise used.
See section __FSEXT_set_data, for an example of how this may be used.
Returns the stored pointer, or NULL if there was an error (or no pointer had been stored).
not ANSI, not POSIX
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