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authormarkm <markm@FreeBSD.org>2002-05-14 16:06:50 +0000
committermarkm <markm@FreeBSD.org>2002-05-14 16:06:50 +0000
commitaeefd5b3e2766cf2adf46ab0d391c6290c566150 (patch)
tree1b2346a595f785988975c71a5f29de7e01b24cc4 /secure/lib/libcrypto/man/SSL_write.3
parentfa71779225949e4336753dba62bf930087152e61 (diff)
downloadFreeBSD-src-aeefd5b3e2766cf2adf46ab0d391c6290c566150.zip
FreeBSD-src-aeefd5b3e2766cf2adf46ab0d391c6290c566150.tar.gz
As the perl-generated assembler files have been committed, add the
perl-generated (.pod) manual pages too. This is another nail in the perl5 coffin (for base perl, not the port or the language in general).
Diffstat (limited to 'secure/lib/libcrypto/man/SSL_write.3')
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+.\" ======================================================================
+.\"
+.IX Title "SSL_WRITE 1"
+.TH SSL_WRITE 1 "perl v5.6.1" "2002-01-27" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+SSL_write \- write bytes to a \s-1TLS/SSL\s0 connection.
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+.Ve
+.Vb 1
+\& int SSL_write(SSL *ssl, const void *buf, int num);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_write()\fR writes \fBnum\fR bytes from the buffer \fBbuf\fR into the specified
+\&\fBssl\fR connection.
+.SH "NOTES"
+.IX Header "NOTES"
+If necessary, \fISSL_write()\fR will negotiate a \s-1TLS/SSL\s0 session, if
+not already explicitly performed by SSL_connect(3) or
+SSL_accept(3). If the
+peer requests a re-negotiation, it will be performed transparently during
+the \fISSL_write()\fR operation. The behaviour of \fISSL_write()\fR depends on the
+underlying \s-1BIO\s0.
+.PP
+For the transparent negotiation to succeed, the \fBssl\fR must have been
+initialized to client or server mode. This is being done by calling
+SSL_set_connect_state(3) or \fISSL_set_accept_state()\fR
+before the first call to an SSL_read(3) or \fISSL_write()\fR function.
+.PP
+If the underlying \s-1BIO\s0 is \fBblocking\fR, \fISSL_write()\fR will only return, once the
+write operation has been finished or an error occurred, except when a
+renegotiation take place, in which case a \s-1SSL_ERROR_WANT_READ\s0 may occur.
+This behaviour can be controlled with the \s-1SSL_MODE_AUTO_RETRY\s0 flag of the
+SSL_CTX_set_mode(3) call.
+.PP
+If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fISSL_write()\fR will also return,
+when the underlying \s-1BIO\s0 could not satisfy the needs of \fISSL_write()\fR
+to continue the operation. In this case a call to
+SSL_get_error(3) with the
+return value of \fISSL_write()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
+\&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. As at any time a re-negotiation is possible, a
+call to \fISSL_write()\fR can also cause read operations! The calling process
+then must repeat the call after taking appropriate action to satisfy the
+needs of \fISSL_write()\fR. The action depends on the underlying \s-1BIO\s0. When using a
+non-blocking socket, nothing is to be done, but \fIselect()\fR can be used to check
+for the required condition. When using a buffering \s-1BIO\s0, like a \s-1BIO\s0 pair, data
+must be written into or retrieved out of the \s-1BIO\s0 before being able to continue.
+.PP
+\&\fISSL_write()\fR will only return with success, when the complete contents
+of \fBbuf\fR of length \fBnum\fR has been written. This default behaviour
+can be changed with the \s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0 option of
+SSL_CTX_set_mode(3). When this flag is set,
+\&\fISSL_write()\fR will also return with success, when a partial write has been
+successfully completed. In this case the \fISSL_write()\fR operation is considered
+completed. The bytes are sent and a new \fISSL_write()\fR operation with a new
+buffer (with the already sent bytes removed) must be started.
+A partial write is performed with the size of a message block, which is
+16kB for SSLv3/TLSv1.
+.SH "WARNING"
+.IX Header "WARNING"
+When an \fISSL_write()\fR operation has to be repeated because of
+\&\fB\s-1SSL_ERROR_WANT_READ\s0\fR or \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR, it must be repeated
+with the same arguments.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+The following return values can occur:
+.Ip ">0" 4
+.IX Item ">0"
+The write operation was successful, the return value is the number of
+bytes actually written to the \s-1TLS/SSL\s0 connection.
+.Ip "0" 4
+The write operation was not successful. Probably the underlying connection
+was closed. Call \fISSL_get_error()\fR with the return value \fBret\fR to find out,
+whether an error occurred or the connection was shut down cleanly
+(\s-1SSL_ERROR_ZERO_RETURN\s0).
+.Sp
+SSLv2 (deprecated) does not support a shutdown alert protocol, so it can
+only be detected, whether the underlying connection was closed. It cannot
+be checked, why the closure happened.
+.Ip "<0" 4
+.IX Item "<0"
+The write operation was not successful, because either an error occurred
+or action must be taken by the calling process. Call \fISSL_get_error()\fR with the
+return value \fBret\fR to find out the reason.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+SSL_get_error(3), SSL_read(3),
+SSL_CTX_set_mode(3), SSL_CTX_new(3),
+SSL_connect(3), SSL_accept(3)
+SSL_set_connect_state(3),
+ssl(3), bio(3)
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