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Diffstat (limited to 'secure/lib/libcrypto/man/BIO_set_callback.3')
| -rw-r--r-- | secure/lib/libcrypto/man/BIO_set_callback.3 | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/BIO_set_callback.3 b/secure/lib/libcrypto/man/BIO_set_callback.3 new file mode 100644 index 0000000..467314e --- /dev/null +++ b/secure/lib/libcrypto/man/BIO_set_callback.3 @@ -0,0 +1,238 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Thu May 9 13:16:09 2002 +.\" +.\" Standard preamble: +.\" ====================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R + +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used +.\" to do unbreakable dashes and therefore won't be available. \*(C` and +.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<> +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr +.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and +.\" index entries marked with X<> in POD. Of course, you'll have to process +.\" the output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. Always turn off hyphenation; it +.\" makes way too many mistakes in technical documents. +.hy 0 +.if n .na +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. 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The callback is called during most high level \s-1BIO\s0 +operations. It can be used for debugging purposes to trace operations on +a \s-1BIO\s0 or to modify its operation. +.PP +\&\fIBIO_set_callback_arg()\fR and \fIBIO_get_callback_arg()\fR are macros which can be +used to set and retrieve an argument for use in the callback. +.PP +\&\fIBIO_debug_callback()\fR is a standard debugging callback which prints +out information relating to each \s-1BIO\s0 operation. If the callback +argument is set if is interpreted as a \s-1BIO\s0 to send the information +to, otherwise stderr is used. +.PP +\&\fIcallback()\fR is the callback function itself. The meaning of each +argument is described below. +.PP +The \s-1BIO\s0 the callback is attached to is passed in \fBb\fR. +.PP +\&\fBoper\fR is set to the operation being performed. For some operations +the callback is called twice, once before and once after the actual +operation, the latter case has \fBoper\fR or'ed with \s-1BIO_CB_RETURN\s0. +.PP +The meaning of the arguments \fBargp\fR, \fBargi\fR and \fBargl\fR depends on +the value of \fBoper\fR, that is the operation being performed. +.PP +\&\fBretvalue\fR is the return value that would be returned to the +application if no callback were present. The actual value returned +is the return value of the callback itself. In the case of callbacks +called before the actual \s-1BIO\s0 operation 1 is placed in retvalue, if +the return value is not positive it will be immediately returned to +the application and the \s-1BIO\s0 operation will not be performed. +.PP +The callback should normally simply return \fBretvalue\fR when it has +finished processing, unless if specifically wishes to modify the +value returned to the application. +.SH "CALLBACK OPERATIONS" +.IX Header "CALLBACK OPERATIONS" +.Ip "\fB\f(BIBIO_free\fB\|(b)\fR" 4 +.IX Item "BIO_free" +callback(b, \s-1BIO_CB_FREE\s0, \s-1NULL\s0, 0L, 0L, 1L) is called before the +free operation. +.Ip "\fBBIO_read(b, out, outl)\fR" 4 +.IX Item "BIO_read(b, out, outl)" +callback(b, \s-1BIO_CB_READ\s0, out, outl, 0L, 1L) is called before +the read and callback(b, BIO_CB_READ|BIO_CB_RETURN, out, outl, 0L, retvalue) +after. +.Ip "\fBBIO_write(b, in, inl)\fR" 4 +.IX Item "BIO_write(b, in, inl)" +callback(b, \s-1BIO_CB_WRITE\s0, in, inl, 0L, 1L) is called before +the write and callback(b, BIO_CB_WRITE|BIO_CB_RETURN, in, inl, 0L, retvalue) +after. +.Ip "\fBBIO_gets(b, out, outl)\fR" 4 +.IX Item "BIO_gets(b, out, outl)" +callback(b, \s-1BIO_CB_GETS\s0, out, outl, 0L, 1L) is called before +the operation and callback(b, BIO_CB_GETS|BIO_CB_RETURN, out, outl, 0L, retvalue) +after. +.Ip "\fBBIO_puts(b, in)\fR" 4 +.IX Item "BIO_puts(b, in)" +callback(b, \s-1BIO_CB_WRITE\s0, in, 0, 0L, 1L) is called before +the operation and callback(b, BIO_CB_WRITE|BIO_CB_RETURN, in, 0, 0L, retvalue) +after. +.Ip "\fBBIO_ctrl(\s-1BIO\s0 *b, int cmd, long larg, void *parg)\fR" 4 +.IX Item "BIO_ctrl(BIO *b, int cmd, long larg, void *parg)" +callback(b,BIO_CB_CTRL,parg,cmd,larg,1L) is called before the call and +callback(b,BIO_CB_CTRL|BIO_CB_RETURN,parg,cmd, larg,ret) after. +.SH "EXAMPLE" +.IX Header "EXAMPLE" +The \fIBIO_debug_callback()\fR function is a good example, its source is +in crypto/bio/bio_cb.c +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\s-1TBA\s0 |
