1.\" Automatically generated by Pod::Man version 1.15
| 1.\" Automatically generated by Pod::Man version 1.15
|
2.\" Mon Jan 13 19:27:12 2003
| 2.\" Mon Feb 3 10:01:41 2003
|
3.\"
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37.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used
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138.\" ======================================================================
139.\"
140.IX Title "BIO_should_retry 3"
| 3.\"
4.\" Standard preamble:
5.\" ======================================================================
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7.br
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10.PP
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37.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used
38.\" to do unbreakable dashes and therefore won't be available. \*(C` and
39.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<>
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59.\" If the F register is turned on, we'll generate index entries on stderr
60.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
61.\" index entries marked with X<> in POD. Of course, you'll have to process
62.\" the output yourself in some meaningful fashion.
63.if \nF \{\
64. de IX
65. tm Index:\\$1\t\\n%\t"\\$2"
66..
67. nr % 0
68. rr F
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70.\"
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72.\" makes way too many mistakes in technical documents.
73.hy 0
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76.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
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138.\" ======================================================================
139.\"
140.IX Title "BIO_should_retry 3"
|
141.TH BIO_should_retry 3 "0.9.7" "2003-01-13" "OpenSSL"
| 141.TH BIO_should_retry 3 "0.9.7" "2003-02-03" "OpenSSL"
|
142.UC
143.SH "NAME"
144BIO_should_retry, BIO_should_read, BIO_should_write,
145BIO_should_io_special, BIO_retry_type, BIO_should_retry,
146BIO_get_retry_BIO, BIO_get_retry_reason \- \s-1BIO\s0 retry functions
147.SH "SYNOPSIS"
148.IX Header "SYNOPSIS"
149.Vb 1
150\& #include <openssl/bio.h>
151.Ve
152.Vb 5
153\& #define BIO_should_read(a) ((a)->flags & BIO_FLAGS_READ)
154\& #define BIO_should_write(a) ((a)->flags & BIO_FLAGS_WRITE)
155\& #define BIO_should_io_special(a) ((a)->flags & BIO_FLAGS_IO_SPECIAL)
156\& #define BIO_retry_type(a) ((a)->flags & BIO_FLAGS_RWS)
157\& #define BIO_should_retry(a) ((a)->flags & BIO_FLAGS_SHOULD_RETRY)
158.Ve
159.Vb 5
160\& #define BIO_FLAGS_READ 0x01
161\& #define BIO_FLAGS_WRITE 0x02
162\& #define BIO_FLAGS_IO_SPECIAL 0x04
163\& #define BIO_FLAGS_RWS (BIO_FLAGS_READ|BIO_FLAGS_WRITE|BIO_FLAGS_IO_SPECIAL)
164\& #define BIO_FLAGS_SHOULD_RETRY 0x08
165.Ve
166.Vb 2
167\& BIO * BIO_get_retry_BIO(BIO *bio, int *reason);
168\& int BIO_get_retry_reason(BIO *bio);
169.Ve
170.SH "DESCRIPTION"
171.IX Header "DESCRIPTION"
172These functions determine why a \s-1BIO\s0 is not able to read or write data.
173They will typically be called after a failed \fIBIO_read()\fR or \fIBIO_write()\fR
174call.
175.PP
176\&\fIBIO_should_retry()\fR is true if the call that produced this condition
177should then be retried at a later time.
178.PP
179If \fIBIO_should_retry()\fR is false then the cause is an error condition.
180.PP
181\&\fIBIO_should_read()\fR is true if the cause of the condition is that a \s-1BIO\s0
182needs to read data.
183.PP
184\&\fIBIO_should_write()\fR is true if the cause of the condition is that a \s-1BIO\s0
185needs to read data.
186.PP
187\&\fIBIO_should_io_special()\fR is true if some \*(L"special\*(R" condition, that is a
188reason other than reading or writing is the cause of the condition.
189.PP
190\&\fIBIO_get_retry_reason()\fR returns a mask of the cause of a retry condition
191consisting of the values \fB\s-1BIO_FLAGS_READ\s0\fR, \fB\s-1BIO_FLAGS_WRITE\s0\fR,
192\&\fB\s-1BIO_FLAGS_IO_SPECIAL\s0\fR though current \s-1BIO\s0 types will only set one of
193these.
194.PP
195\&\fIBIO_get_retry_BIO()\fR determines the precise reason for the special
196condition, it returns the \s-1BIO\s0 that caused this condition and if
197\&\fBreason\fR is not \s-1NULL\s0 it contains the reason code. The meaning of
198the reason code and the action that should be taken depends on
199the type of \s-1BIO\s0 that resulted in this condition.
200.PP
201\&\fIBIO_get_retry_reason()\fR returns the reason for a special condition if
202passed the relevant \s-1BIO\s0, for example as returned by \fIBIO_get_retry_BIO()\fR.
203.SH "NOTES"
204.IX Header "NOTES"
205If \fIBIO_should_retry()\fR returns false then the precise \*(L"error condition\*(R"
206depends on the \s-1BIO\s0 type that caused it and the return code of the \s-1BIO\s0
207operation. For example if a call to \fIBIO_read()\fR on a socket \s-1BIO\s0 returns
2080 and \fIBIO_should_retry()\fR is false then the cause will be that the
209connection closed. A similar condition on a file \s-1BIO\s0 will mean that it
210has reached \s-1EOF\s0. Some \s-1BIO\s0 types may place additional information on
211the error queue. For more details see the individual \s-1BIO\s0 type manual
212pages.
213.PP
214If the underlying I/O structure is in a blocking mode almost all current
215\&\s-1BIO\s0 types will not request a retry, because the underlying I/O
216calls will not. If the application knows that the \s-1BIO\s0 type will never
217signal a retry then it need not call \fIBIO_should_retry()\fR after a failed
218\&\s-1BIO\s0 I/O call. This is typically done with file BIOs.
219.PP
220\&\s-1SSL\s0 BIOs are the only current exception to this rule: they can request a
221retry even if the underlying I/O structure is blocking, if a handshake
222occurs during a call to \fIBIO_read()\fR. An application can retry the failed
223call immediately or avoid this situation by setting \s-1SSL_MODE_AUTO_RETRY\s0
224on the underlying \s-1SSL\s0 structure.
225.PP
226While an application may retry a failed non blocking call immediately
227this is likely to be very inefficient because the call will fail
228repeatedly until data can be processed or is available. An application
229will normally wait until the necessary condition is satisfied. How
230this is done depends on the underlying I/O structure.
231.PP
232For example if the cause is ultimately a socket and \fIBIO_should_read()\fR
233is true then a call to \fIselect()\fR may be made to wait until data is
234available and then retry the \s-1BIO\s0 operation. By combining the retry
235conditions of several non blocking BIOs in a single \fIselect()\fR call
236it is possible to service several BIOs in a single thread, though
237the performance may be poor if \s-1SSL\s0 BIOs are present because long delays
238can occur during the initial handshake process.
239.PP
240It is possible for a \s-1BIO\s0 to block indefinitely if the underlying I/O
241structure cannot process or return any data. This depends on the behaviour of
242the platforms I/O functions. This is often not desirable: one solution
243is to use non blocking I/O and use a timeout on the \fIselect()\fR (or
244equivalent) call.
245.SH "BUGS"
246.IX Header "BUGS"
247The OpenSSL \s-1ASN1\s0 functions cannot gracefully deal with non blocking I/O:
248that is they cannot retry after a partial read or write. This is usually
249worked around by only passing the relevant data to \s-1ASN1\s0 functions when
250the entire structure can be read or written.
251.SH "SEE ALSO"
252.IX Header "SEE ALSO"
253\&\s-1TBA\s0
| 142.UC
143.SH "NAME"
144BIO_should_retry, BIO_should_read, BIO_should_write,
145BIO_should_io_special, BIO_retry_type, BIO_should_retry,
146BIO_get_retry_BIO, BIO_get_retry_reason \- \s-1BIO\s0 retry functions
147.SH "SYNOPSIS"
148.IX Header "SYNOPSIS"
149.Vb 1
150\& #include <openssl/bio.h>
151.Ve
152.Vb 5
153\& #define BIO_should_read(a) ((a)->flags & BIO_FLAGS_READ)
154\& #define BIO_should_write(a) ((a)->flags & BIO_FLAGS_WRITE)
155\& #define BIO_should_io_special(a) ((a)->flags & BIO_FLAGS_IO_SPECIAL)
156\& #define BIO_retry_type(a) ((a)->flags & BIO_FLAGS_RWS)
157\& #define BIO_should_retry(a) ((a)->flags & BIO_FLAGS_SHOULD_RETRY)
158.Ve
159.Vb 5
160\& #define BIO_FLAGS_READ 0x01
161\& #define BIO_FLAGS_WRITE 0x02
162\& #define BIO_FLAGS_IO_SPECIAL 0x04
163\& #define BIO_FLAGS_RWS (BIO_FLAGS_READ|BIO_FLAGS_WRITE|BIO_FLAGS_IO_SPECIAL)
164\& #define BIO_FLAGS_SHOULD_RETRY 0x08
165.Ve
166.Vb 2
167\& BIO * BIO_get_retry_BIO(BIO *bio, int *reason);
168\& int BIO_get_retry_reason(BIO *bio);
169.Ve
170.SH "DESCRIPTION"
171.IX Header "DESCRIPTION"
172These functions determine why a \s-1BIO\s0 is not able to read or write data.
173They will typically be called after a failed \fIBIO_read()\fR or \fIBIO_write()\fR
174call.
175.PP
176\&\fIBIO_should_retry()\fR is true if the call that produced this condition
177should then be retried at a later time.
178.PP
179If \fIBIO_should_retry()\fR is false then the cause is an error condition.
180.PP
181\&\fIBIO_should_read()\fR is true if the cause of the condition is that a \s-1BIO\s0
182needs to read data.
183.PP
184\&\fIBIO_should_write()\fR is true if the cause of the condition is that a \s-1BIO\s0
185needs to read data.
186.PP
187\&\fIBIO_should_io_special()\fR is true if some \*(L"special\*(R" condition, that is a
188reason other than reading or writing is the cause of the condition.
189.PP
190\&\fIBIO_get_retry_reason()\fR returns a mask of the cause of a retry condition
191consisting of the values \fB\s-1BIO_FLAGS_READ\s0\fR, \fB\s-1BIO_FLAGS_WRITE\s0\fR,
192\&\fB\s-1BIO_FLAGS_IO_SPECIAL\s0\fR though current \s-1BIO\s0 types will only set one of
193these.
194.PP
195\&\fIBIO_get_retry_BIO()\fR determines the precise reason for the special
196condition, it returns the \s-1BIO\s0 that caused this condition and if
197\&\fBreason\fR is not \s-1NULL\s0 it contains the reason code. The meaning of
198the reason code and the action that should be taken depends on
199the type of \s-1BIO\s0 that resulted in this condition.
200.PP
201\&\fIBIO_get_retry_reason()\fR returns the reason for a special condition if
202passed the relevant \s-1BIO\s0, for example as returned by \fIBIO_get_retry_BIO()\fR.
203.SH "NOTES"
204.IX Header "NOTES"
205If \fIBIO_should_retry()\fR returns false then the precise \*(L"error condition\*(R"
206depends on the \s-1BIO\s0 type that caused it and the return code of the \s-1BIO\s0
207operation. For example if a call to \fIBIO_read()\fR on a socket \s-1BIO\s0 returns
2080 and \fIBIO_should_retry()\fR is false then the cause will be that the
209connection closed. A similar condition on a file \s-1BIO\s0 will mean that it
210has reached \s-1EOF\s0. Some \s-1BIO\s0 types may place additional information on
211the error queue. For more details see the individual \s-1BIO\s0 type manual
212pages.
213.PP
214If the underlying I/O structure is in a blocking mode almost all current
215\&\s-1BIO\s0 types will not request a retry, because the underlying I/O
216calls will not. If the application knows that the \s-1BIO\s0 type will never
217signal a retry then it need not call \fIBIO_should_retry()\fR after a failed
218\&\s-1BIO\s0 I/O call. This is typically done with file BIOs.
219.PP
220\&\s-1SSL\s0 BIOs are the only current exception to this rule: they can request a
221retry even if the underlying I/O structure is blocking, if a handshake
222occurs during a call to \fIBIO_read()\fR. An application can retry the failed
223call immediately or avoid this situation by setting \s-1SSL_MODE_AUTO_RETRY\s0
224on the underlying \s-1SSL\s0 structure.
225.PP
226While an application may retry a failed non blocking call immediately
227this is likely to be very inefficient because the call will fail
228repeatedly until data can be processed or is available. An application
229will normally wait until the necessary condition is satisfied. How
230this is done depends on the underlying I/O structure.
231.PP
232For example if the cause is ultimately a socket and \fIBIO_should_read()\fR
233is true then a call to \fIselect()\fR may be made to wait until data is
234available and then retry the \s-1BIO\s0 operation. By combining the retry
235conditions of several non blocking BIOs in a single \fIselect()\fR call
236it is possible to service several BIOs in a single thread, though
237the performance may be poor if \s-1SSL\s0 BIOs are present because long delays
238can occur during the initial handshake process.
239.PP
240It is possible for a \s-1BIO\s0 to block indefinitely if the underlying I/O
241structure cannot process or return any data. This depends on the behaviour of
242the platforms I/O functions. This is often not desirable: one solution
243is to use non blocking I/O and use a timeout on the \fIselect()\fR (or
244equivalent) call.
245.SH "BUGS"
246.IX Header "BUGS"
247The OpenSSL \s-1ASN1\s0 functions cannot gracefully deal with non blocking I/O:
248that is they cannot retry after a partial read or write. This is usually
249worked around by only passing the relevant data to \s-1ASN1\s0 functions when
250the entire structure can be read or written.
251.SH "SEE ALSO"
252.IX Header "SEE ALSO"
253\&\s-1TBA\s0
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