239 lines
7.8 KiB
Groff
239 lines
7.8 KiB
Groff
.\" Automatically generated by Pod::Man version 1.15
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.\" Mon Jan 13 19:27:11 2003
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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 "0.9.7" "2003-01-13" "OpenSSL"
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.UC
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.SH "NAME"
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BIO_set_callback, BIO_get_callback, BIO_set_callback_arg, BIO_get_callback_arg,
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BIO_debug_callback \- \s-1BIO\s0 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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.Ve
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.Vb 4
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\& #define BIO_set_callback(b,cb) ((b)->callback=(cb))
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\& #define BIO_get_callback(b) ((b)->callback)
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\& #define BIO_set_callback_arg(b,arg) ((b)->cb_arg=(char *)(arg))
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\& #define BIO_get_callback_arg(b) ((b)->cb_arg)
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.Ve
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.Vb 2
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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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.Vb 2
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\& typedef long callback(BIO *b, int oper, const char *argp,
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\& int argi, long argl, long retvalue);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBIO_set_callback()\fR and \fIBIO_get_callback()\fR set and retrieve the \s-1BIO\s0 callback,
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they are both macros. The callback is called during most high level \s-1BIO\s0
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operations. It can be used for debugging purposes to trace operations on
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a \s-1BIO\s0 or to modify its operation.
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.PP
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\&\fIBIO_set_callback_arg()\fR and \fIBIO_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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\&\fIBIO_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 if 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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\&\fIcallback()\fR is the callback function itself. The meaning of each
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argument is described below.
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.PP
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The \s-1BIO\s0 the callback is attached to is passed in \fBb\fR.
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.PP
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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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.PP
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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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.PP
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\&\fBretvalue\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 retvalue, 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 \fBretvalue\fR when it has
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finished processing, unless if 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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.Ip "\fB\f(BIBIO_free\fB\|(b)\fR" 4
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.IX Item "BIO_free"
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callback(b, \s-1BIO_CB_FREE\s0, \s-1NULL\s0, 0L, 0L, 1L) is called before the
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free operation.
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.Ip "\fBBIO_read(b, out, outl)\fR" 4
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.IX Item "BIO_read(b, out, outl)"
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callback(b, \s-1BIO_CB_READ\s0, out, outl, 0L, 1L) is called before
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the read and callback(b, BIO_CB_READ|BIO_CB_RETURN, out, outl, 0L, retvalue)
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after.
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.Ip "\fBBIO_write(b, in, inl)\fR" 4
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.IX Item "BIO_write(b, in, inl)"
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callback(b, \s-1BIO_CB_WRITE\s0, in, inl, 0L, 1L) is called before
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the write and callback(b, BIO_CB_WRITE|BIO_CB_RETURN, in, inl, 0L, retvalue)
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after.
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.Ip "\fBBIO_gets(b, out, outl)\fR" 4
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.IX Item "BIO_gets(b, out, outl)"
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callback(b, \s-1BIO_CB_GETS\s0, out, outl, 0L, 1L) is called before
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the operation and callback(b, BIO_CB_GETS|BIO_CB_RETURN, out, outl, 0L, retvalue)
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after.
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.Ip "\fBBIO_puts(b, in)\fR" 4
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.IX Item "BIO_puts(b, in)"
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callback(b, \s-1BIO_CB_WRITE\s0, in, 0, 0L, 1L) is called before
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the operation and callback(b, BIO_CB_WRITE|BIO_CB_RETURN, in, 0, 0L, retvalue)
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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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callback(b,BIO_CB_CTRL,parg,cmd,larg,1L) is called before the call and
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callback(b,BIO_CB_CTRL|BIO_CB_RETURN,parg,cmd, larg,ret) after.
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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The \fIBIO_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 "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\s-1TBA\s0
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