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+.\" Automatically generated by Pod::Man version 1.15
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+.\" ======================================================================
+.\"
+.IX Title "BIO_F_BUFFER 1"
+.TH BIO_F_BUFFER 1 "perl v5.6.1" "2000-11-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+BIO_f_buffer \- buffering \s-1BIO\s0
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/bio.h>
+.Ve
+.Vb 1
+\& BIO_METHOD * BIO_f_buffer(void);
+.Ve
+.Vb 5
+\& #define BIO_get_buffer_num_lines(b) BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
+\& #define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
+\& #define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
+\& #define BIO_set_buffer_size(b,size) BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
+\& #define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
+.PP
+Data written to a buffering \s-1BIO\s0 is buffered and periodically written
+to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from
+an internal buffer which is filled from the next \s-1BIO\s0 in the chain.
+Both \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported.
+.PP
+Calling \fIBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data.
+.PP
+\&\fIBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered.
+.PP
+\&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
+set the read, write or both read and write buffer sizes to \fBsize\fR. The initial
+buffer size is \s-1DEFAULT_BUFFER_SIZE\s0, currently 1024. Any attempt to reduce the
+buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared
+when the buffer is resized.
+.PP
+\&\fIBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR
+bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer
+is expanded.
+.SH "NOTES"
+.IX Header "NOTES"
+Buffering BIOs implement \fIBIO_gets()\fR by using \fIBIO_read()\fR operations on the
+next \s-1BIO\s0 in the chain. By prepending a buffering \s-1BIO\s0 to a chain it is therefore
+possible to provide \fIBIO_gets()\fR functionality if the following BIOs do not
+support it (for example \s-1SSL\s0 BIOs).
+.PP
+Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills
+or when \fIBIO_flush()\fR is called. It is therefore important to call \fIBIO_flush()\fR
+whenever any pending data should be written such as when removing a buffering
+\&\s-1BIO\s0 using \fIBIO_pop()\fR. \fIBIO_flush()\fR may need to be retried if the ultimate
+source/sink \s-1BIO\s0 is non blocking.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
+.PP
+\&\fIBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0).
+.PP
+\&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
+return 1 if the buffer was successfully resized or 0 for failure.
+.PP
+\&\fIBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if
+there was an error.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\s-1TBA\s0
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