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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BIO_push, BIO_pop \- add and remove BIOs from a chain. .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bio.h> \& \& BIO * BIO_push(BIO *b,BIO *append); \& BIO * BIO_pop(BIO *b); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fBBIO_push()\fR function appends the \s-1BIO\s0 \fBappend\fR to \fBb\fR, it returns \&\fBb\fR. .PP \&\fBBIO_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. .\" Oracle has added the ARC stability level to this manual page .SH ATTRIBUTES See .BR attributes (7) for descriptions of the following attributes: .sp .TS box; cbp-1 | cbp-1 l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE = Availability library/security/openssl = Stability Pass-through uncommitted .TE .PP .SH "NOTES" .IX Header "NOTES" The names of these functions are perhaps a little misleading. \fBBIO_push()\fR joins two \s-1BIO\s0 chains whereas \fBBIO_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 \fBBIO_push()\fR and \fBBIO_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. .\" Oracle has added source availability information to this manual page Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source-code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://www.openssl.org/source/openssl-1.0.2zi.tar.gz. Further information about this software can be found on the open source community website at https://www.openssl.org/. .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 .PP is made then the new chain will be \fBb64\-f\fR. After making the calls .PP .Vb 2 \& BIO_push(md2, b64); \& BIO_push(md1, md2); .Ve .PP 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 .PP 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" \&\fBBIO_push()\fR returns the end of the chain, \fBb\fR. .PP \&\fBBIO_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