=pod =head1 NAME BIO_get_new_index, BIO_meth_new, BIO_meth_free, BIO_meth_get_read_ex, BIO_meth_set_read_ex, BIO_meth_get_write_ex, BIO_meth_set_write_ex, BIO_meth_get_write, BIO_meth_set_write, BIO_meth_get_read, BIO_meth_set_read, BIO_meth_get_puts, BIO_meth_set_puts, BIO_meth_get_gets, BIO_meth_set_gets, BIO_meth_get_ctrl, BIO_meth_set_ctrl, BIO_meth_get_create, BIO_meth_set_create, BIO_meth_get_destroy, BIO_meth_set_destroy, BIO_meth_get_callback_ctrl, BIO_meth_set_callback_ctrl - Routines to build up BIO methods =head1 SYNOPSIS #include int BIO_get_new_index(void); BIO_METHOD *BIO_meth_new(int type, const char *name); void BIO_meth_free(BIO_METHOD *biom); int (*BIO_meth_get_write_ex(BIO_METHOD *biom))(BIO *, const char *, size_t, size_t *); int (*BIO_meth_get_write(BIO_METHOD *biom))(BIO *, const char *, int); int BIO_meth_set_write_ex(BIO_METHOD *biom, int (*bwrite)(BIO *, const char *, size_t, size_t *)); int BIO_meth_set_write(BIO_METHOD *biom, int (*write)(BIO *, const char *, int)); int (*BIO_meth_get_read_ex(BIO_METHOD *biom))(BIO *, char *, size_t, size_t *); int (*BIO_meth_get_read(BIO_METHOD *biom))(BIO *, char *, int); int BIO_meth_set_read_ex(BIO_METHOD *biom, int (*bread)(BIO *, char *, size_t, size_t *)); int BIO_meth_set_read(BIO_METHOD *biom, int (*read)(BIO *, char *, int)); int (*BIO_meth_get_puts(BIO_METHOD *biom))(BIO *, const char *); int BIO_meth_set_puts(BIO_METHOD *biom, int (*puts)(BIO *, const char *)); int (*BIO_meth_get_gets(BIO_METHOD *biom))(BIO *, char *, int); int BIO_meth_set_gets(BIO_METHOD *biom, int (*gets)(BIO *, char *, int)); long (*BIO_meth_get_ctrl(BIO_METHOD *biom))(BIO *, int, long, void *); int BIO_meth_set_ctrl(BIO_METHOD *biom, long (*ctrl)(BIO *, int, long, void *)); int (*BIO_meth_get_create(BIO_METHOD *bion))(BIO *); int BIO_meth_set_create(BIO_METHOD *biom, int (*create)(BIO *)); int (*BIO_meth_get_destroy(BIO_METHOD *biom))(BIO *); int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy)(BIO *)); long (*BIO_meth_get_callback_ctrl(BIO_METHOD *biom))(BIO *, int, bio_info_cb *); int BIO_meth_set_callback_ctrl(BIO_METHOD *biom, long (*callback_ctrl)(BIO *, int, bio_info_cb *)); =head1 DESCRIPTION The B type is a structure used for the implementation of new BIO types. It provides a set of functions used by OpenSSL for the implementation of the various BIO capabilities. See the L page for more information. BIO_meth_new() creates a new B structure. It should be given a unique integer B and a string that represents its B. Use BIO_get_new_index() to get the value for B. The set of standard OpenSSL provided BIO types is provided in B. Some examples include B and B. Filter BIOs should have a type which have the "filter" bit set (B). Source/sink BIOs should have the "source/sink" bit set (B). File descriptor based BIOs (e.g. socket, fd, connect, accept etc) should additionally have the "descriptor" bit set (B). See the L page for more information. BIO_meth_free() destroys a B structure and frees up any memory associated with it. BIO_meth_get_write_ex() and BIO_meth_set_write_ex() get and set the function used for writing arbitrary length data to the BIO respectively. This function will be called in response to the application calling BIO_write_ex() or BIO_write(). The parameters for the function have the same meaning as for BIO_write_ex(). Older code may call BIO_meth_get_write() and BIO_meth_set_write() instead. Applications should not call both BIO_meth_set_write_ex() and BIO_meth_set_write() or call BIO_meth_get_write() when the function was set with BIO_meth_set_write_ex(). BIO_meth_get_read_ex() and BIO_meth_set_read_ex() get and set the function used for reading arbitrary length data from the BIO respectively. This function will be called in response to the application calling BIO_read_ex() or BIO_read(). The parameters for the function have the same meaning as for BIO_read_ex(). Older code may call BIO_meth_get_read() and BIO_meth_set_read() instead. Applications should not call both BIO_meth_set_read_ex() and BIO_meth_set_read() or call BIO_meth_get_read() when the function was set with BIO_meth_set_read_ex(). BIO_meth_get_puts() and BIO_meth_set_puts() get and set the function used for writing a NULL terminated string to the BIO respectively. This function will be called in response to the application calling BIO_puts(). The parameters for the function have the same meaning as for BIO_puts(). BIO_meth_get_gets() and BIO_meth_set_gets() get and set the function typically used for reading a line of data from the BIO respectively (see the L page for more information). This function will be called in response to the application calling BIO_gets(). The parameters for the function have the same meaning as for BIO_gets(). BIO_meth_get_ctrl() and BIO_meth_set_ctrl() get and set the function used for processing ctrl messages in the BIO respectively. See the L page for more information. This function will be called in response to the application calling BIO_ctrl(). The parameters for the function have the same meaning as for BIO_ctrl(). BIO_meth_get_create() and BIO_meth_set_create() get and set the function used for creating a new instance of the BIO respectively. This function will be called in response to the application calling BIO_new() and passing in a pointer to the current BIO_METHOD. The BIO_new() function will allocate the memory for the new BIO, and a pointer to this newly allocated structure will be passed as a parameter to the function. BIO_meth_get_destroy() and BIO_meth_set_destroy() get and set the function used for destroying an instance of a BIO respectively. This function will be called in response to the application calling BIO_free(). A pointer to the BIO to be destroyed is passed as a parameter. The destroy function should be used for BIO specific clean up. The memory for the BIO itself should not be freed by this function. BIO_meth_get_callback_ctrl() and BIO_meth_set_callback_ctrl() get and set the function used for processing callback ctrl messages in the BIO respectively. See the L page for more information. This function will be called in response to the application calling BIO_callback_ctrl(). The parameters for the function have the same meaning as for BIO_callback_ctrl(). =head1 SEE ALSO L, L, L, L, L =head1 HISTORY The functions described here were added in OpenSSL 1.1.0. =head1 COPYRIGHT Copyright 2016-2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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 L. =cut