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[dragonfly.git] / secure / lib / libcrypto / man / BIO_push.3
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2''' $RCSfile$$Revision$$Date$
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34'''
35'''
36''' Set up \*(-- to give an unbreakable dash;
37''' string Tr holds user defined translation string.
38''' Bell System Logo is used as a dummy character.
39'''
984263bc 40.tr \(*W-|\(bv\*(Tr
984263bc 41.ie n \{\
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42.ds -- \(*W-
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44.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
45.if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
46.ds L" ""
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48''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
49''' \*(L" and \*(R", except that they are used on ".xx" lines,
50''' such as .IP and .SH, which do another additional levels of
51''' double-quote interpretation
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64.ds -- \(em\|
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80.\" If the F register is turned on, we'll generate
81.\" index entries out stderr for the following things:
82.\" TH Title
83.\" SH Header
84.\" Sh Subsection
85.\" Ip Item
86.\" X<> Xref (embedded
87.\" Of course, you have to process the output yourself
88.\" in some meaninful fashion.
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984263bc 95.\}
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96.TH BIO_push 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
984263bc 99.if n .na
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100.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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110.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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984263bc 114.if n \{\
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115. ds #H 0
116. ds #V .8m
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118. ds #[ \f1
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120.\}
121.if t \{\
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122. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
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139.\}
140.if t \{\
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141. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
142. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
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149. ds q o\h'-\w'o'u*8/10'\s-4\v'.4m'\z\(*i\v'-.4m'\s+4\h'\w'o'u*8/10'
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172\{\
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188.\}
189.rm #[ #] #H #V #F C
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190.SH "NAME"
191BIO_push, BIO_pop \- add and remove BIOs from a chain.
192.SH "SYNOPSIS"
74dab6c2 193.PP
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194.Vb 1
195\& #include <openssl/bio.h>
196.Ve
197.Vb 2
198\& BIO * BIO_push(BIO *b,BIO *append);
199\& BIO * BIO_pop(BIO *b);
200.Ve
201.SH "DESCRIPTION"
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202The \fIBIO_push()\fR function appends the BIO \fBappend\fR to \fBb\fR, it returns
203\fBb\fR.
984263bc 204.PP
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205\fIBIO_pop()\fR removes the BIO \fBb\fR from a chain and returns the next BIO
206in the chain, or NULL if there is no next BIO. The removed BIO then
207becomes a single BIO with no association with the original chain,
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208it can thus be freed or attached to a different chain.
209.SH "NOTES"
984263bc 210The names of these functions are perhaps a little misleading. \fIBIO_push()\fR
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211joins two BIO chains whereas \fIBIO_pop()\fR deletes a single BIO from a chain,
212the deleted BIO does not need to be at the end of a chain.
984263bc 213.PP
74dab6c2 214The process of calling \fIBIO_push()\fR and \fIBIO_pop()\fR on a BIO may have additional
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215consequences (a control call is made to the affected BIOs) any effects will
216be noted in the descriptions of individual BIOs.
217.SH "EXAMPLES"
984263bc 218For these examples suppose \fBmd1\fR and \fBmd2\fR are digest BIOs, \fBb64\fR is
74dab6c2 219a base64 BIO and \fBf\fR is a file BIO.
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220.PP
221If the call:
222.PP
223.Vb 1
224\& BIO_push(b64, f);
225.Ve
74dab6c2 226is made then the new chain will be \fBb64-chain\fR. After making the calls
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227.PP
228.Vb 2
229\& BIO_push(md2, b64);
230\& BIO_push(md1, md2);
231.Ve
74dab6c2 232the new chain is \fBmd1-md2-b64-f\fR. Data written to \fBmd1\fR will be digested
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233by \fBmd1\fR and \fBmd2\fR, \fBbase64\fR encoded and written to \fBf\fR.
234.PP
235It should be noted that reading causes data to pass in the reverse
236direction, that is data is read from \fBf\fR, base64 \fBdecoded\fR and digested
237by \fBmd1\fR and \fBmd2\fR. If the call:
238.PP
239.Vb 1
240\& BIO_pop(md2);
241.Ve
74dab6c2 242The call will return \fBb64\fR and the new chain will be \fBmd1-b64-f\fR data can
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243be written to \fBmd1\fR as before.
244.SH "RETURN VALUES"
74dab6c2 245\fIBIO_push()\fR returns the end of the chain, \fBb\fR.
984263bc 246.PP
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247\fIBIO_pop()\fR returns the next BIO in the chain, or NULL if there is no next
248BIO.
984263bc 249.SH "SEE ALSO"
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250TBA
251
252.rn }` ''
253.IX Title "BIO_push 3"
254.IX Name "BIO_push, BIO_pop - add and remove BIOs from a chain."
255
256.IX Header "NAME"
257
258.IX Header "SYNOPSIS"
259
260.IX Header "DESCRIPTION"
261
262.IX Header "NOTES"
263
264.IX Header "EXAMPLES"
265
266.IX Header "RETURN VALUES"
267
984263bc 268.IX Header "SEE ALSO"
74dab6c2 269