OSSL_ERR_STATE_new, OSSL_ERR_STATE_save, OSSL_ERR_STATE_save_to_mark, OSSL_ERR_STATE_restore, OSSL_ERR_STATE_free - saving and restoring error state
#include <openssl/err.h>
ERR_STATE *OSSL_ERR_STATE_new(void); void OSSL_ERR_STATE_save(ERR_STATE *es); void OSSL_ERR_STATE_save_to_mark(ERR_STATE *es); void OSSL_ERR_STATE_restore(const ERR_STATE *es); void OSSL_ERR_STATE_free(ERR_STATE *es);
These functions save and restore the error state from the thread local error state to a preallocated error state structure.
OSSL_ERR_STATE_new()
allocates an empty error state structure to
be used when saving and restoring thread error state.
OSSL_ERR_STATE_save()
saves the thread error state to es. It
subsequently clears the thread error state. Any previously saved
state in es is cleared prior to saving the new state.
OSSL_ERR_STATE_save_to_mark()
is similar to OSSL_ERR_STATE_save()
but only saves
ERR entries up to the most recent mark on the ERR stack. These entries are moved
to es and removed from the thread error state. However, the most recent
marked ERR and any ERR state before it remains part of the thread error state
and is not moved to the ERR_STATE. The mark is not cleared and must be cleared
explicitly after a call to this function using ERR_pop_to_mark(3) or
ERR_clear_last_mark(3). (Since a call to OSSL_ERR_STATE_save_to_mark()
leaves
the marked ERR as the top error, either of these functions will have the same
effect.) If there is no marked ERR in the thread local error state, all ERR
entries are copied and the effect is the same as for a call to
OSSL_ERR_STATE_save()
.
OSSL_ERR_STATE_restore()
adds all the error entries from the
saved state es to the thread error state. Existing entries in
the thread error state are not affected if there is enough space
for all the added entries. Any allocated data in the saved error
entries is duplicated on adding to the thread state.
OSSL_ERR_STATE_free()
frees the saved error state es.
If the argument is NULL, nothing is done.
OSSL_ERR_STATE_new()
returns a pointer to the allocated ERR_STATE
structure or NULL on error.
OSSL_ERR_STATE_save()
, OSSL_ERR_STATE_save_to_mark()
, OSSL_ERR_STATE_restore()
,
OSSL_ERR_STATE_free()
do not return any values.
OSSL_ERR_STATE_save()
and OSSL_ERR_STATE_save_to_mark()
cannot fail as it takes
over any allocated data from the thread error state.
OSSL_ERR_STATE_restore()
is a best effort function. The only failure
that can happen during its operation is when memory allocation fails.
Because it manipulates the thread error state it avoids raising memory
errors on such failure. At worst the restored error entries will be
missing the auxiliary error data.
ERR_raise(3), ERR_get_error(3), ERR_clear_error(3)
All of these functions were added in OpenSSL 3.2.
Copyright 2023-2024 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.