Merge from vendor branch LIBEVENT:
[dragonfly.git] / secure / lib / libcrypto / man / BIO_f_buffer.3
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124.\" ========================================================================
125.\"
126.IX Title "BIO_f_buffer 3"
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127.TH BIO_f_buffer 3 "2007-10-24" "0.9.8g" "OpenSSL"
128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
130.if n .ad l
131.nh
984263bc 132.SH "NAME"
74dab6c2 133BIO_f_buffer \- buffering BIO
984263bc 134.SH "SYNOPSIS"
8b0cefbb 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/bio.h>
2eaa1526 138\&
984263bc 139\& BIO_METHOD * BIO_f_buffer(void);
2eaa1526 140\&
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141\& #define BIO_get_buffer_num_lines(b) BIO_ctrl(b,BIO_C_GET_BUFF_NUM_LINES,0,NULL)
142\& #define BIO_set_read_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,0)
143\& #define BIO_set_write_buffer_size(b,size) BIO_int_ctrl(b,BIO_C_SET_BUFF_SIZE,size,1)
144\& #define BIO_set_buffer_size(b,size) BIO_ctrl(b,BIO_C_SET_BUFF_SIZE,size,NULL)
145\& #define BIO_set_buffer_read_data(b,buf,num) BIO_ctrl(b,BIO_C_SET_BUFF_READ_DATA,num,buf)
146.Ve
147.SH "DESCRIPTION"
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148.IX Header "DESCRIPTION"
149\&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
984263bc 150.PP
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151Data written to a buffering \s-1BIO\s0 is buffered and periodically written
152to the next \s-1BIO\s0 in the chain. Data read from a buffering \s-1BIO\s0 comes from
153an internal buffer which is filled from the next \s-1BIO\s0 in the chain.
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154Both \fIBIO_gets()\fR and \fIBIO_puts()\fR are supported.
155.PP
8b0cefbb 156Calling \fIBIO_reset()\fR on a buffering \s-1BIO\s0 clears any buffered data.
984263bc 157.PP
8b0cefbb 158\&\fIBIO_get_buffer_num_lines()\fR returns the number of lines currently buffered.
984263bc 159.PP
8b0cefbb 160\&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
984263bc 161set the read, write or both read and write buffer sizes to \fBsize\fR. The initial
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162buffer size is \s-1DEFAULT_BUFFER_SIZE\s0, currently 1024. Any attempt to reduce the
163buffer size below \s-1DEFAULT_BUFFER_SIZE\s0 is ignored. Any buffered data is cleared
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164when the buffer is resized.
165.PP
8b0cefbb 166\&\fIBIO_set_buffer_read_data()\fR clears the read buffer and fills it with \fBnum\fR
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167bytes of \fBbuf\fR. If \fBnum\fR is larger than the current buffer size the buffer
168is expanded.
169.SH "NOTES"
8b0cefbb 170.IX Header "NOTES"
984263bc 171Buffering BIOs implement \fIBIO_gets()\fR by using \fIBIO_read()\fR operations on the
8b0cefbb 172next \s-1BIO\s0 in the chain. By prepending a buffering \s-1BIO\s0 to a chain it is therefore
984263bc 173possible to provide \fIBIO_gets()\fR functionality if the following BIOs do not
8b0cefbb 174support it (for example \s-1SSL\s0 BIOs).
984263bc 175.PP
8b0cefbb 176Data is only written to the next \s-1BIO\s0 in the chain when the write buffer fills
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177or when \fIBIO_flush()\fR is called. It is therefore important to call \fIBIO_flush()\fR
178whenever any pending data should be written such as when removing a buffering
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179\&\s-1BIO\s0 using \fIBIO_pop()\fR. \fIBIO_flush()\fR may need to be retried if the ultimate
180source/sink \s-1BIO\s0 is non blocking.
984263bc 181.SH "RETURN VALUES"
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182.IX Header "RETURN VALUES"
183\&\fIBIO_f_buffer()\fR returns the buffering \s-1BIO\s0 method.
984263bc 184.PP
8b0cefbb 185\&\fIBIO_get_buffer_num_lines()\fR returns the number of lines buffered (may be 0).
984263bc 186.PP
8b0cefbb 187\&\fIBIO_set_read_buffer_size()\fR, \fIBIO_set_write_buffer_size()\fR and \fIBIO_set_buffer_size()\fR
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188return 1 if the buffer was successfully resized or 0 for failure.
189.PP
8b0cefbb 190\&\fIBIO_set_buffer_read_data()\fR returns 1 if the data was set correctly or 0 if
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191there was an error.
192.SH "SEE ALSO"
193.IX Header "SEE ALSO"
8b0cefbb 194\&\s-1TBA\s0