forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
393 lines
12 KiB
Groff
393 lines
12 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BIO_SET_CALLBACK 3"
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.TH BIO_SET_CALLBACK 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BIO_set_callback_ex, BIO_get_callback_ex, BIO_set_callback, BIO_get_callback, BIO_set_callback_arg, BIO_get_callback_arg, BIO_debug_callback, BIO_callback_fn_ex, BIO_callback_fn \&\- BIO callback functions
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bio.h>
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\&
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\& typedef long (*BIO_callback_fn_ex)(BIO *b, int oper, const char *argp,
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\& size_t len, int argi,
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\& long argl, int ret, size_t *processed);
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\& typedef long (*BIO_callback_fn)(BIO *b, int oper, const char *argp, int argi,
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\& long argl, long ret);
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\&
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\& void BIO_set_callback_ex(BIO *b, BIO_callback_fn_ex callback);
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\& BIO_callback_fn_ex BIO_get_callback_ex(const BIO *b);
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\&
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\& void BIO_set_callback(BIO *b, BIO_callback_fn cb);
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\& BIO_callback_fn BIO_get_callback(BIO *b);
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\& void BIO_set_callback_arg(BIO *b, char *arg);
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\& char *BIO_get_callback_arg(const BIO *b);
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\&
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\& long BIO_debug_callback(BIO *bio, int cmd, const char *argp, int argi,
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\& long argl, long ret);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBBIO_set_callback_ex()\fR and \fBBIO_get_callback_ex()\fR set and retrieve the \s-1BIO\s0
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callback. The callback is called during most high level \s-1BIO\s0 operations. It can
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be used for debugging purposes to trace operations on a \s-1BIO\s0 or to modify its
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operation.
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.PP
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\&\fBBIO_set_callback()\fR and \fBBIO_get_callback()\fR set and retrieve the old format \s-1BIO\s0
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callback. New code should not use these functions, but they are retained for
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backwards compatibility. Any callback set via \fBBIO_set_callback_ex()\fR will get
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called in preference to any set by \fBBIO_set_callback()\fR.
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.PP
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\&\fBBIO_set_callback_arg()\fR and \fBBIO_get_callback_arg()\fR are macros which can be
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used to set and retrieve an argument for use in the callback.
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.PP
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\&\fBBIO_debug_callback()\fR is a standard debugging callback which prints
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out information relating to each \s-1BIO\s0 operation. If the callback
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argument is set it is interpreted as a \s-1BIO\s0 to send the information
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to, otherwise stderr is used.
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.PP
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\&\fBBIO_callback_fn_ex()\fR is the type of the callback function and \fBBIO_callback_fn()\fR
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is the type of the old format callback function. The meaning of each argument
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is described below:
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.IP "\fBb\fR" 4
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.IX Item "b"
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The \s-1BIO\s0 the callback is attached to is passed in \fBb\fR.
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.IP "\fBoper\fR" 4
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.IX Item "oper"
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\&\fBoper\fR is set to the operation being performed. For some operations
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the callback is called twice, once before and once after the actual
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operation, the latter case has \fBoper\fR or'ed with \s-1BIO_CB_RETURN.\s0
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.IP "\fBlen\fR" 4
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.IX Item "len"
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The length of the data requested to be read or written. This is only useful if
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\&\fBoper\fR is \s-1BIO_CB_READ, BIO_CB_WRITE\s0 or \s-1BIO_CB_GETS.\s0
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.IP "\fBargp\fR \fBargi\fR \fBargl\fR" 4
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.IX Item "argp argi argl"
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The meaning of the arguments \fBargp\fR, \fBargi\fR and \fBargl\fR depends on
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the value of \fBoper\fR, that is the operation being performed.
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.IP "\fBprocessed\fR" 4
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.IX Item "processed"
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\&\fBprocessed\fR is a pointer to a location which will be updated with the amount of
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data that was actually read or written. Only used for \s-1BIO_CB_READ, BIO_CB_WRITE,
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BIO_CB_GETS\s0 and \s-1BIO_CB_PUTS.\s0
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.IP "\fBret\fR" 4
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.IX Item "ret"
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\&\fBret\fR is the return value that would be returned to the
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application if no callback were present. The actual value returned
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is the return value of the callback itself. In the case of callbacks
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called before the actual \s-1BIO\s0 operation 1 is placed in \fBret\fR, if
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the return value is not positive it will be immediately returned to
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the application and the \s-1BIO\s0 operation will not be performed.
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.PP
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The callback should normally simply return \fBret\fR when it has
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finished processing, unless it specifically wishes to modify the
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value returned to the application.
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.SH "CALLBACK OPERATIONS"
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.IX Header "CALLBACK OPERATIONS"
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In the notes below, \fBcallback\fR defers to the actual callback
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function that is called.
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.IP "\fBBIO_free(b)\fR" 4
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.IX Item "BIO_free(b)"
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.Vb 1
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\& callback_ex(b, BIO_CB_FREE, NULL, 0, 0, 0L, 1L, NULL)
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.Ve
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.Sp
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or
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.Sp
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.Vb 1
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\& callback(b, BIO_CB_FREE, NULL, 0L, 0L, 1L)
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.Ve
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.Sp
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is called before the free operation.
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.IP "\fBBIO_read_ex(b, data, dlen, readbytes)\fR" 4
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.IX Item "BIO_read_ex(b, data, dlen, readbytes)"
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.Vb 1
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\& callback_ex(b, BIO_CB_READ, data, dlen, 0, 0L, 1L, NULL)
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.Ve
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.Sp
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or
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.Sp
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.Vb 1
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\& callback(b, BIO_CB_READ, data, dlen, 0L, 1L)
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.Ve
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.Sp
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is called before the read and
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.Sp
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.Vb 2
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\& callback_ex(b, BIO_CB_READ | BIO_CB_RETURN, data, dlen, 0, 0L, retvalue,
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\& &readbytes)
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.Ve
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.Sp
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or
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.Sp
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.Vb 1
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\& callback(b, BIO_CB_READ|BIO_CB_RETURN, data, dlen, 0L, retvalue)
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.Ve
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.Sp
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after.
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.IP "\fBBIO_write(b, data, dlen, written)\fR" 4
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.IX Item "BIO_write(b, data, dlen, written)"
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.Vb 1
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\& callback_ex(b, BIO_CB_WRITE, data, dlen, 0, 0L, 1L, NULL)
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.Ve
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.Sp
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or
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.Sp
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.Vb 1
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\& callback(b, BIO_CB_WRITE, datat, dlen, 0L, 1L)
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.Ve
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.Sp
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is called before the write and
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.Sp
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.Vb 2
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\& callback_ex(b, BIO_CB_WRITE | BIO_CB_RETURN, data, dlen, 0, 0L, retvalue,
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\& &written)
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.Ve
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.Sp
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or
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.Vb 1
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\& callback(b, BIO_CB_WRITE|BIO_CB_RETURN, data, dlen, 0L, retvalue)
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.Ve
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after.
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.IP "\fBBIO_gets(b, buf, size)\fR" 4
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.IX Item "BIO_gets(b, buf, size)"
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.Vb 1
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\& callback_ex(b, BIO_CB_GETS, buf, size, 0, 0L, 1, NULL, NULL)
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.Ve
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or
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.Vb 1
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\& callback(b, BIO_CB_GETS, buf, size, 0L, 1L)
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.Ve
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.Sp
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is called before the operation and
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.Sp
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.Vb 2
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\& callback_ex(b, BIO_CB_GETS | BIO_CB_RETURN, buf, size, 0, 0L, retvalue,
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\& &readbytes)
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.Ve
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or
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.Vb 1
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\& callback(b, BIO_CB_GETS|BIO_CB_RETURN, buf, size, 0L, retvalue)
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.Ve
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.Sp
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after.
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.IP "\fBBIO_puts(b, buf)\fR" 4
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.IX Item "BIO_puts(b, buf)"
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.Vb 1
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\& callback_ex(b, BIO_CB_PUTS, buf, 0, 0, 0L, 1L, NULL);
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.Ve
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or
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.Vb 1
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\& callback(b, BIO_CB_PUTS, buf, 0, 0L, 1L)
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.Ve
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.Sp
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is called before the operation and
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.Sp
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.Vb 1
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\& callback_ex(b, BIO_CB_PUTS | BIO_CB_RETURN, buf, 0, 0, 0L, retvalue, &written)
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.Ve
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.Sp
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or
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.Sp
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.Vb 1
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\& callback(b, BIO_CB_PUTS|BIO_CB_RETURN, buf, 0, 0L, retvalue)
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.Ve
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.Sp
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after.
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.IP "\fBBIO_ctrl(\s-1BIO\s0 *b, int cmd, long larg, void *parg)\fR" 4
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.IX Item "BIO_ctrl(BIO *b, int cmd, long larg, void *parg)"
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.Vb 1
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\& callback_ex(b, BIO_CB_CTRL, parg, 0, cmd, larg, 1L, NULL)
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.Ve
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.Sp
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or
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.Sp
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.Vb 1
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\& callback(b, BIO_CB_CTRL, parg, cmd, larg, 1L)
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.Ve
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.Sp
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is called before the call and
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.Vb 1
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\& callback_ex(b, BIO_CB_CTRL | BIO_CB_RETURN, parg, 0, cmd, larg, ret, NULL)
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.Ve
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.Sp
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or
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.Sp
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.Vb 1
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\& callback(b, BIO_CB_CTRL|BIO_CB_RETURN, parg, cmd, larg, ret)
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.Ve
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.Sp
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after.
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Note: \fBcmd\fR == \fB\s-1BIO_CTRL_SET_CALLBACK\s0\fR is special, because \fBparg\fR is not the
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argument of type \fBBIO_info_cb\fR itself. In this case \fBparg\fR is a pointer to
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the actual call parameter, see \fBBIO_callback_ctrl\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBBIO_get_callback_ex()\fR and \fBBIO_get_callback()\fR return the callback function
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previously set by a call to \fBBIO_set_callback_ex()\fR and \fBBIO_set_callback()\fR
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respectively.
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.PP
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\&\fBBIO_get_callback_arg()\fR returns a \fBchar\fR pointer to the value previously set
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via a call to \fBBIO_set_callback_arg()\fR.
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.PP
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\&\fBBIO_debug_callback()\fR returns 1 or \fBret\fR if it's called after specific \s-1BIO\s0
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operations.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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The \fBBIO_debug_callback()\fR function is a good example, its source is
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in crypto/bio/bio_cb.c
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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