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Command: ASN1_NULL_new | Section: 3 | Source: OpenBSD | File: ASN1_NULL_new.3
ASN1_NULL_NEW(3) FreeBSD Library Functions Manual ASN1_NULL_NEW(3)
NAME
ASN1_NULL_new, ASN1_NULL_free - ASN.1 NULL value
SYNOPSIS
#include <openssl/asn1.h>
ASN1_NULL *
ASN1_NULL_new(void);
void
ASN1_NULL_free(ASN1_NULL *val_in);
DESCRIPTION
ASN1_NULL_new() returns a specific invalid pointer that represents the
ASN.1 NULL value, which is the only possible value of the ASN.1 NULL
type. That pointer is different from a NULL pointer. Dereferencing it
almost certainly results in a segmentation fault. This function does not
allocate memory and cannot fail.
ASN1_NULL_free() has no effect whatsoever. In particular, it ignores the
val_in argument and does not free any memory. In normal use, application
programs only pass the invalid pointer obtained from ASN1_NULL_new() to
this function. But even if a valid pointer is passed, that pointer does
not become invalid.
The ASN.1 NULL type is also represented by the V_ASN1_NULL type
identifier constant.
SEE ALSO
ASN1_item_new(3), d2i_ASN1_NULL(3)
STANDARDS
ITU-T Recommendation X.208, also known as ISO/IEC 8824-1: Specification
of Abstract Syntax Notation One (ASN.1), section 19: Notation for the
null type
HISTORY
ASN1_NULL_new() and ASN1_NULL_free() first appeared in OpenSSL 0.9.5 and
have been available since OpenBSD 2.7.
FreeBSD 14.1-RELEASE-p8 December 9, 2021 FreeBSD 14.1-RELEASE-p8