dlerror - obtain error diagnostic for functions in the dlopen API
The dlerror() function returns a human-readable, null-terminated string describing the most recent error that occurred from a call to one of the functions in the dlopen API since the last call to dlerror(). The returned string does
not include a trailing newline.
dlerror() returns NULL if no errors have occurred since initialization or since it was last called.
For an explanation of the terms used in this section, see attributes(7).
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