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+.\" ======================================================================
+.\"
+.IX Title "BIO_PUSH 1"
+.TH BIO_PUSH 1 "perl v5.6.1" "2000-11-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+BIO_push, BIO_pop \- add and remove BIOs from a chain.
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/bio.h>
+.Ve
+.Vb 2
+\& BIO *  BIO_push(BIO *b,BIO *append);
+\& BIO *  BIO_pop(BIO *b);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The \fIBIO_push()\fR function appends the \s-1BIO\s0 \fBappend\fR to \fBb\fR, it returns
+\&\fBb\fR.
+.PP
+\&\fIBIO_pop()\fR removes the \s-1BIO\s0 \fBb\fR from a chain and returns the next \s-1BIO\s0
+in the chain, or \s-1NULL\s0 if there is no next \s-1BIO\s0. The removed \s-1BIO\s0 then
+becomes a single \s-1BIO\s0 with no association with the original chain,
+it can thus be freed or attached to a different chain.
+.SH "NOTES"
+.IX Header "NOTES"
+The names of these functions are perhaps a little misleading. \fIBIO_push()\fR
+joins two \s-1BIO\s0 chains whereas \fIBIO_pop()\fR deletes a single \s-1BIO\s0 from a chain,
+the deleted \s-1BIO\s0 does not need to be at the end of a chain.
+.PP
+The process of calling \fIBIO_push()\fR and \fIBIO_pop()\fR on a \s-1BIO\s0 may have additional
+consequences (a control call is made to the affected BIOs) any effects will
+be noted in the descriptions of individual BIOs.
+.SH "EXAMPLES"
+.IX Header "EXAMPLES"
+For these examples suppose \fBmd1\fR and \fBmd2\fR are digest BIOs, \fBb64\fR is
+a base64 \s-1BIO\s0 and \fBf\fR is a file \s-1BIO\s0.
+.PP
+If the call:
+.PP
+.Vb 1
+\& BIO_push(b64, f);
+.Ve
+is made then the new chain will be \fBb64\-chain\fR. After making the calls
+.PP
+.Vb 2
+\& BIO_push(md2, b64);
+\& BIO_push(md1, md2);
+.Ve
+the new chain is \fBmd1\-md2\-b64\-f\fR. Data written to \fBmd1\fR will be digested
+by \fBmd1\fR and \fBmd2\fR, \fBbase64\fR encoded and written to \fBf\fR.
+.PP
+It should be noted that reading causes data to pass in the reverse
+direction, that is data is read from \fBf\fR, base64 \fBdecoded\fR and digested
+by \fBmd1\fR and \fBmd2\fR. If the call:
+.PP
+.Vb 1
+\& BIO_pop(md2);
+.Ve
+The call will return \fBb64\fR and the new chain will be \fBmd1\-b64\-f\fR data can
+be written to \fBmd1\fR as before.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIBIO_push()\fR returns the end of the chain, \fBb\fR.
+.PP
+\&\fIBIO_pop()\fR returns the next \s-1BIO\s0 in the chain, or \s-1NULL\s0 if there is no next
+\&\s-1BIO\s0.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\s-1TBA\s0