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If an ELF library function fails,
a program can call elf_errno() to retrieve the library's internal error number. As a side effect, this function resets the internal error number to 0, which indicates no error.
The elf_errmsg() function takes an error number, err, and returns a null-terminated error message (with no trailing new-line) that describes the problem. A zero err retrieves a message for the most recent error. If no error
has occurred, the return value is a null pointer (not a pointer to the null string). Using err of -1 also retrieves the most recent error, except it guarantees a non-null return value, even when no error has occurred. If no message is available for the
given number, elf_errmsg() returns a pointer to an appropriate message. This function does not have the side effect of clearing the internal error number.
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