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=pod
=head1 NAME
CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific data functions
=head1 SYNOPSIS
#include
int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
=head1 DESCRIPTION
Several OpenSSL structures can have application specific data attached to them.
These functions are used internally by OpenSSL to manipulate application
specific data attached to a specific structure.
These functions should only be used by applications to manipulate
B structures passed to the B, B and
B callbacks: as passed to B for example.
B is used to set application specific data, the data is
supplied in the B parameter and its precise meaning is up to the
application.
B is used to retrieve application specific data. The data
is returned to the application, this will be the same value as supplied to
a previous B call.
=head1 RETURN VALUES
B returns 1 on success or 0 on failure.
B returns the application data or 0 on failure. 0 may also
be valid application data but currently it can only fail if given an invalid B
parameter.
On failure an error code can be obtained from L.
=head1 SEE ALSO
L,
L,
L
=head1 HISTORY
CRYPTO_set_ex_data() and CRYPTO_get_ex_data() have been available since SSLeay 0.9.0.
=cut