1=pod 2 3=head1 NAME 4
| 1=pod 2 3=head1 NAME 4
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5SSL_get_error - obtain result code for SSL I/O operation
| 5SSL_get_error - obtain result code for TLS/SSL I/O operation
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6 7=head1 SYNOPSIS 8 9 #include <openssl/ssl.h> 10 11 int SSL_get_error(SSL *ssl, int ret); 12 13=head1 DESCRIPTION 14 15SSL_get_error() returns a result code (suitable for the C "switch" 16statement) for a preceding call to SSL_connect(), SSL_accept(), 17SSL_read(), or SSL_write() on B<ssl>. The value returned by that
| 6 7=head1 SYNOPSIS 8 9 #include <openssl/ssl.h> 10 11 int SSL_get_error(SSL *ssl, int ret); 12 13=head1 DESCRIPTION 14 15SSL_get_error() returns a result code (suitable for the C "switch" 16statement) for a preceding call to SSL_connect(), SSL_accept(), 17SSL_read(), or SSL_write() on B<ssl>. The value returned by that
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18SSL I/O function must be passed to SSL_get_error() in parameter
| 18TLS/SSL I/O function must be passed to SSL_get_error() in parameter
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19B<ret>. 20 21In addition to B<ssl> and B<ret>, SSL_get_error() inspects the 22current thread's OpenSSL error queue. Thus, SSL_get_error() must be
| 19B<ret>. 20 21In addition to B<ssl> and B<ret>, SSL_get_error() inspects the 22current thread's OpenSSL error queue. Thus, SSL_get_error() must be
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23used in the same thread that performed the SSL I/O operation, and no
| 23used in the same thread that performed the TLS/SSL I/O operation, and no
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24other OpenSSL function calls should appear in between. The current
| 24other OpenSSL function calls should appear in between. The current
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25thread's error queue must be empty before the SSL I/O operation is
| 25thread's error queue must be empty before the TLS/SSL I/O operation is
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26attempted, or SSL_get_error() will not work reliably. 27 28=head1 RETURN VALUES 29 30The following return values can currently occur: 31 32=over 4 33 34=item SSL_ERROR_NONE 35
| 26attempted, or SSL_get_error() will not work reliably. 27 28=head1 RETURN VALUES 29 30The following return values can currently occur: 31 32=over 4 33 34=item SSL_ERROR_NONE 35
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36The SSL I/O operation completed. This result code is returned
| 36The TLS/SSL I/O operation completed. This result code is returned
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37if and only if B<ret E<gt> 0>. 38 39=item SSL_ERROR_ZERO_RETURN 40
| 37if and only if B<ret E<gt> 0>. 38 39=item SSL_ERROR_ZERO_RETURN 40
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41The SSL connection has been closed. If the protocol version is SSL 3.0
| 41The TLS/SSL connection has been closed. If the protocol version is SSL 3.0
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42or TLS 1.0, this result code is returned only if a closure
| 42or TLS 1.0, this result code is returned only if a closure
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43alerts has occurred in the protocol, i.e. if the connection has been 44closed cleanly.
| 43alert has occurred in the protocol, i.e. if the connection has been 44closed cleanly. Note that in this case B<SSL_ERROR_ZERO_RETURN> 45does not necessarily indicate that the underlying transport 46has been closed.
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45 46=item SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE 47
| 47 48=item SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE 49
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48The operation did not complete; the same SSL I/O function should be
| 50The operation did not complete; the same TLS/SSL I/O function should be
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49called again later. There will be protocol progress if, by then, the 50underlying B<BIO> has data available for reading (if the result code is 51B<SSL_ERROR_WANT_READ>) or allows writing data (B<SSL_ERROR_WANT_WRITE>). 52For socket B<BIO>s (e.g. when SSL_set_fd() was used) this means that 53select() or poll() on the underlying socket can be used to find out
| 51called again later. There will be protocol progress if, by then, the 52underlying B<BIO> has data available for reading (if the result code is 53B<SSL_ERROR_WANT_READ>) or allows writing data (B<SSL_ERROR_WANT_WRITE>). 54For socket B<BIO>s (e.g. when SSL_set_fd() was used) this means that 55select() or poll() on the underlying socket can be used to find out
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54when the SSL I/O function should be retried.
| 56when the TLS/SSL I/O function should be retried.
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55
| 57
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56Caveat: Any SSL I/O function can lead to either of
| 58Caveat: Any TLS/SSL I/O function can lead to either of
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57B<SSL_ERROR_WANT_READ> and B<SSL_ERROR_WANT_WRITE>, i.e. SSL_read() 58may want to write data and SSL_write() may want to read data. 59 60=item SSL_ERROR_WANT_X509_LOOKUP 61 62The operation did not complete because an application callback set by 63SSL_CTX_set_client_cert_cb() has asked to be called again.
| 59B<SSL_ERROR_WANT_READ> and B<SSL_ERROR_WANT_WRITE>, i.e. SSL_read() 60may want to write data and SSL_write() may want to read data. 61 62=item SSL_ERROR_WANT_X509_LOOKUP 63 64The operation did not complete because an application callback set by 65SSL_CTX_set_client_cert_cb() has asked to be called again.
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64The SSL I/O function should be called again later.
| 66The TLS/SSL I/O function should be called again later.
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65Details depend on the application. 66 67=item SSL_ERROR_SYSCALL 68 69Some I/O error occurred. The OpenSSL error queue may contain more 70information on the error. If the error queue is empty 71(i.e. ERR_get_error() returns 0), B<ret> can be used to find out more 72about the error: If B<ret == 0>, an EOF was observed that violates 73the protocol. If B<ret == -1>, the underlying B<BIO> reported an 74I/O error (for socket I/O on Unix systems, consult B<errno> for details). 75 76=item SSL_ERROR_SSL 77 78A failure in the SSL library occurred, usually a protocol error. The 79OpenSSL error queue contains more information on the error. 80 81=back 82 83=head1 SEE ALSO 84 85L<ssl(3)|ssl(3)>, L<err(3)|err(3)> 86 87=head1 HISTORY 88 89SSL_get_error() was added in SSLeay 0.8. 90 91=cut
| 67Details depend on the application. 68 69=item SSL_ERROR_SYSCALL 70 71Some I/O error occurred. The OpenSSL error queue may contain more 72information on the error. If the error queue is empty 73(i.e. ERR_get_error() returns 0), B<ret> can be used to find out more 74about the error: If B<ret == 0>, an EOF was observed that violates 75the protocol. If B<ret == -1>, the underlying B<BIO> reported an 76I/O error (for socket I/O on Unix systems, consult B<errno> for details). 77 78=item SSL_ERROR_SSL 79 80A failure in the SSL library occurred, usually a protocol error. The 81OpenSSL error queue contains more information on the error. 82 83=back 84 85=head1 SEE ALSO 86 87L<ssl(3)|ssl(3)>, L<err(3)|err(3)> 88 89=head1 HISTORY 90 91SSL_get_error() was added in SSLeay 0.8. 92 93=cut
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