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BIO_meth_get_ctrl.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bio.h> \& \& 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(const BIO_METHOD *biom))(BIO *, const char *, size_t, \& size_t *); \& int (*BIO_meth_get_write(const 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(const BIO_METHOD *biom))(BIO *, char *, size_t, size_t *); \& int (*BIO_meth_get_read(const 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(const BIO_METHOD *biom))(BIO *, const char *); \& int BIO_meth_set_puts(BIO_METHOD *biom, int (*puts)(BIO *, const char *)); \& \& int (*BIO_meth_get_gets(const BIO_METHOD *biom))(BIO *, char *, int); \& int BIO_meth_set_gets(BIO_METHOD *biom, \& int (*gets)(BIO *, char *, int)); \& \& long (*BIO_meth_get_ctrl(const 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(const BIO_METHOD *bion))(BIO *); \& int BIO_meth_set_create(BIO_METHOD *biom, int (*create)(BIO *)); \& \& int (*BIO_meth_get_destroy(const BIO_METHOD *biom))(BIO *); \& int BIO_meth_set_destroy(BIO_METHOD *biom, int (*destroy)(BIO *)); \& \& long (*BIO_meth_get_callback_ctrl(const 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 *)); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fB\s-1BIO_METHOD\s0\fR type is a structure used for the implementation of new \s-1BIO\s0 types. It provides a set of functions used by OpenSSL for the implementation of the various \s-1BIO\s0 capabilities. See the bio page for more information. .PP \&\fBBIO_meth_new()\fR creates a new \fB\s-1BIO_METHOD\s0\fR structure. It should be given a unique integer \fBtype\fR and a string that represents its \fBname\fR. Use \fBBIO_get_new_index()\fR to get the value for \fBtype\fR. .PP The set of standard OpenSSL provided \s-1BIO\s0 types is provided in \fBbio.h\fR. Some examples include \fB\s-1BIO_TYPE_BUFFER\s0\fR and \fB\s-1BIO_TYPE_CIPHER\s0\fR. Filter BIOs should have a type which have the \*(L"filter\*(R" bit set (\fB\s-1BIO_TYPE_FILTER\s0\fR). Source/sink BIOs should have the \*(L"source/sink\*(R" bit set (\fB\s-1BIO_TYPE_SOURCE_SINK\s0\fR). File descriptor based BIOs (e.g. socket, fd, connect, accept etc) should additionally have the \&\*(L"descriptor\*(R" bit set (\fB\s-1BIO_TYPE_DESCRIPTOR\s0\fR). See the BIO_find_type page for more information. .PP \&\fBBIO_meth_free()\fR destroys a \fB\s-1BIO_METHOD\s0\fR structure and frees up any memory associated with it. .PP \&\fBBIO_meth_get_write_ex()\fR and \fBBIO_meth_set_write_ex()\fR get and set the function used for writing arbitrary length data to the \s-1BIO\s0 respectively. This function will be called in response to the application calling \fBBIO_write_ex()\fR or \&\fBBIO_write()\fR. The parameters for the function have the same meaning as for \&\fBBIO_write_ex()\fR. Older code may call \fBBIO_meth_get_write()\fR and \&\fBBIO_meth_set_write()\fR instead. Applications should not call both \&\fBBIO_meth_set_write_ex()\fR and \fBBIO_meth_set_write()\fR or call \fBBIO_meth_get_write()\fR when the function was set with \fBBIO_meth_set_write_ex()\fR. .PP \&\fBBIO_meth_get_read_ex()\fR and \fBBIO_meth_set_read_ex()\fR get and set the function used for reading arbitrary length data from the \s-1BIO\s0 respectively. This function will be called in response to the application calling \fBBIO_read_ex()\fR or \fBBIO_read()\fR. The parameters for the function have the same meaning as for \fBBIO_read_ex()\fR. Older code may call \fBBIO_meth_get_read()\fR and \fBBIO_meth_set_read()\fR instead. Applications should not call both \fBBIO_meth_set_read_ex()\fR and \fBBIO_meth_set_read()\fR or call \fBBIO_meth_get_read()\fR when the function was set with \&\fBBIO_meth_set_read_ex()\fR. .PP \&\fBBIO_meth_get_puts()\fR and \fBBIO_meth_set_puts()\fR get and set the function used for writing a \s-1NULL\s0 terminated string to the \s-1BIO\s0 respectively. This function will be called in response to the application calling \fBBIO_puts()\fR. The parameters for the function have the same meaning as for \fBBIO_puts()\fR. .PP \&\fBBIO_meth_get_gets()\fR and \fBBIO_meth_set_gets()\fR get and set the function typically used for reading a line of data from the \s-1BIO\s0 respectively (see the \fBBIO_gets\fR\|(3) page for more information). This function will be called in response to the application calling \fBBIO_gets()\fR. The parameters for the function have the same meaning as for \fBBIO_gets()\fR. .PP \&\fBBIO_meth_get_ctrl()\fR and \fBBIO_meth_set_ctrl()\fR get and set the function used for processing ctrl messages in the \s-1BIO\s0 respectively. See the BIO_ctrl page for more information. This function will be called in response to the application calling \fBBIO_ctrl()\fR. The parameters for the function have the same meaning as for \&\fBBIO_ctrl()\fR. .PP \&\fBBIO_meth_get_create()\fR and \fBBIO_meth_set_create()\fR get and set the function used for creating a new instance of the \s-1BIO\s0 respectively. This function will be called in response to the application calling \fBBIO_new()\fR and passing in a pointer to the current \s-1BIO_METHOD.\s0 The \fBBIO_new()\fR function will allocate the memory for the new \s-1BIO,\s0 and a pointer to this newly allocated structure will be passed as a parameter to the function. .PP \&\fBBIO_meth_get_destroy()\fR and \fBBIO_meth_set_destroy()\fR get and set the function used for destroying an instance of a \s-1BIO\s0 respectively. This function will be called in response to the application calling \fBBIO_free()\fR. A pointer to the \s-1BIO\s0 to be destroyed is passed as a parameter. The destroy function should be used for \s-1BIO\s0 specific clean up. The memory for the \s-1BIO\s0 itself should not be freed by this function. .PP \&\fBBIO_meth_get_callback_ctrl()\fR and \fBBIO_meth_set_callback_ctrl()\fR get and set the function used for processing callback ctrl messages in the \s-1BIO\s0 respectively. See the \fBBIO_callback_ctrl\fR\|(3) page for more information. This function will be called in response to the application calling \fBBIO_callback_ctrl()\fR. The parameters for the function have the same meaning as for \fBBIO_callback_ctrl()\fR. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBIO_get_new_index()\fR returns the new \s-1BIO\s0 type value or \-1 if an error occurred. .PP BIO_meth_new(int type, const char *name) returns a valid \fB\s-1BIO_METHOD\s0\fR or \s-1NULL\s0 if an error occurred. .PP The \fBBIO_meth_set\fR functions return 1 on success or 0 on error. .PP The \fBBIO_meth_get\fR functions return the corresponding function pointers. .SH "SEE ALSO" .IX Header "SEE ALSO" bio, BIO_find_type, BIO_ctrl, BIO_read_ex, BIO_new .SH "HISTORY" .IX Header "HISTORY" The functions described here were added in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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