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A library that provides a single interface for error handling.
Specifically this is intended for cases where some errors are
errno errors or other libc errors and there are library-specific,
maybe for multiple libraries, errors.
The errors are thread-local, support error description, error
source string (which function failed), and error code with
error code group (e.g. "errno", "addrinfo" or a library name),
as well as cause chains, extended details, and if linked
together with liberror-backtrace, backtraces.
The important functions are:
liberror_get_error
Get error for the calling thread
liberror_set_error
Set error for the calling thread
liberror_set_error_errno
Wrapper for liberror_set_error for errno errors
liberror_reset_error
Remove error for the calling thread, needed
because `liberror_set_error` otherwise stores
the error as the cause of the new error
liberror_print_error
Print the error for the calling thread, include
its backtrace if liberror-backtrace is also
linked, the errors cause, and optionally remove
the error for the calling thread.
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