BIO_ctrl_get_read_request man page on DigitalUNIX

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BIO_ctrl_get_read_request(3)			  BIO_ctrl_get_read_request(3)

NAME
       BIO_ctrl_get_read_request - Find out how many bytes were requested from
       the BIO

SYNOPSIS
       #include <openssl/bio.h>

       size_t BIO_ctrl_get_read_request(
	       BIO *bio );

DESCRIPTION
       The BIO_ctrl_get_read_request() function returns the  number  of	 bytes
       that  were  last	 requested from bio by a BIO_read() operation. This is
       useful for BIO pairs, for example, so that the  application  knows  how
       many bytes to supply to bio.

NOTES
       When bio is NULL, the OpenSSL library calls assert().

RETURN VALUES
       The following return values can occur: The number of bytes requested.

SEE ALSO
       Functions: bio(3), BIO_s_mem(3), BIO_new_bio_pair(3)

						  BIO_ctrl_get_read_request(3)
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