283 lines
7.6 KiB
Groff
283 lines
7.6 KiB
Groff
.rn '' }`
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'''
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'''
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.de Sh
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.br
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.if t .Sp
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.ne 5
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.PP
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\fB\\$1\fR
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.PP
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..
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.de Sp
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.if t .sp .5v
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.if n .sp
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..
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.de Ip
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.br
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.ie \\n(.$>=3 .ne \\$3
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.el .ne 3
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.IP "\\$1" \\$2
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..
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.de Vb
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.ft CW
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.nf
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.ne \\$1
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.de Ve
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.ft R
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.fi
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..
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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.if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
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.ds L" ""
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.ds R" ""
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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''' double-quote interpretation
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.ds M" """
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'br\}
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.el\{\
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.ds -- \(em\|
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.tr \*(Tr
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.ds L" ``
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.ds R" ''
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.ds T' '
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.ds PI \(*p
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'br\}
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.de IX
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.tm Index:\\$1\t\\n%\t"\\$2"
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..
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.nr % 0
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.rr F
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.\}
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.TH SSL_get_error 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.de CQ \" put $1 in typewriter font
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.ft CW
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'if n "\c
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'if t \\&\\$1\c
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'if n \\&\\$1\c
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'if n \&"
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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'.ft R
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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.bd B 3
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.\}
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. ds #] \&
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.\}
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. \" simple accents for nroff and troff
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.if n \{\
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. ds ' \&
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.ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u'
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.ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u'
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.ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#]
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.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
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.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
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.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
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.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
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.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
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.ds ae a\h'-(\w'a'u*4/10)'e
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.ds Ae A\h'-(\w'A'u*4/10)'E
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.ds oe o\h'-(\w'o'u*4/10)'e
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.ds Oe O\h'-(\w'O'u*4/10)'E
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. \" corrections for vroff
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
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. \" for low resolution devices (crt and lpr)
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.if \n(.H>23 .if \n(.V>19 \
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\{\
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. ds : e
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. ds 8 ss
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. ds v \h'-1'\o'\(aa\(ga'
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. ds _ \h'-1'^
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. ds . \h'-1'.
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. ds 3 3
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. ds o a
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. ds d- d\h'-1'\(ga
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. ds D- D\h'-1'\(hy
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. ds th \o'bp'
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. ds Th \o'LP'
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. ds ae ae
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. ds Ae AE
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. ds oe oe
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. ds Oe OE
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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SSL_get_error \- obtain result code for SSL I/O operation
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/ssl.h>
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.Ve
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.Vb 1
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\& int SSL_get_error(SSL *ssl, int ret);
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.Ve
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.SH "DESCRIPTION"
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\fISSL_get_error()\fR returns a result code (suitable for the C \*(L"switch\*(R"
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statement) for a preceding call to \fISSL_connect()\fR, \fISSL_accept()\fR,
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\fISSL_read()\fR, or \fISSL_write()\fR on \fBssl\fR. The value returned by that
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SSL I/O function must be passed to \fISSL_get_error()\fR in parameter
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\fBret\fR.
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.PP
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In addition to \fBssl\fR and \fBret\fR, \fISSL_get_error()\fR inspects the
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current thread's OpenSSL error queue. Thus, \fISSL_get_error()\fR must be
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used in the same thread that performed the SSL I/O operation, and no
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other OpenSSL function calls should appear in between. The current
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thread's error queue must be empty before the SSL I/O operation is
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attempted, or \fISSL_get_error()\fR will not work reliably.
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.SH "RETURN VALUES"
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The following return values can currently occur:
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.Ip "\s-1SSL_ERROR_NONE\s0" 4
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The \s-1SSL\s0 I/O operation completed. This result code is returned
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if and only if \fBret > 0\fR.
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.Ip "\s-1SSL_ERROR_ZERO_RETURN\s0" 4
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The \s-1SSL\s0 connection has been closed. If the protocol version is \s-1SSL\s0 3.0
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or \s-1TLS\s0 1.0, this result code is returned only if a closure
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alerts has occurred in the protocol, i.e. if the connection has been
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closed cleanly.
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.Ip "\s-1SSL_ERROR_WANT_READ\s0, \s-1SSL_ERROR_WANT_WRITE\s0" 4
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The operation did not complete; the same \s-1SSL\s0 I/O function should be
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called again later. There will be protocol progress if, by then, the
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underlying \fB\s-1BIO\s0\fR has data available for reading (if the result code is
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\fB\s-1SSL_ERROR_WANT_READ\s0\fR) or allows writing data (\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR).
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For socket \fB\s-1BIO\s0\fRs (e.g. when \fISSL_set_fd()\fR was used) this means that
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\fIselect()\fR or \fIpoll()\fR on the underlying socket can be used to find out
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when the \s-1SSL\s0 I/O function should be retried.
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.Sp
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Caveat: Any \s-1SSL\s0 I/O function can lead to either of
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\fB\s-1SSL_ERROR_WANT_READ\s0\fR and \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR, i.e. \fISSL_read()\fR
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may want to write data and \fISSL_write()\fR may want to read data.
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.Ip "\s-1SSL_ERROR_WANT_X509_LOOKUP\s0" 4
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The operation did not complete because an application callback set by
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\fISSL_CTX_set_client_cert_cb()\fR has asked to be called again.
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The \s-1SSL\s0 I/O function should be called again later.
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Details depend on the application.
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.Ip "\s-1SSL_ERROR_SYSCALL\s0" 4
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Some I/O error occurred. The OpenSSL error queue may contain more
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information on the error. If the error queue is empty
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(i.e. \fIERR_get_error()\fR returns 0), \fBret\fR can be used to find out more
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about the error: If \fBret == 0\fR, an \s-1EOF\s0 was observed that violates
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the protocol. If \fBret == \-1\fR, the underlying \fB\s-1BIO\s0\fR reported an
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I/O error (for socket I/O on Unix systems, consult \fBerrno\fR for details).
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.Ip "\s-1SSL_ERROR_SSL\s0" 4
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A failure in the \s-1SSL\s0 library occurred, usually a protocol error. The
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OpenSSL error queue contains more information on the error.
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.SH "SEE ALSO"
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the \fIssl(3)|ssl(3)\fR manpage, the \fIerr(3)|err(3)\fR manpage
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.SH "HISTORY"
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\fISSL_get_error()\fR was added in SSLeay 0.8.
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.rn }` ''
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.IX Title "SSL_get_error 3"
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.IX Name "SSL_get_error - obtain result code for SSL I/O operation"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "RETURN VALUES"
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.IX Item "\s-1SSL_ERROR_NONE\s0"
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.IX Item "\s-1SSL_ERROR_ZERO_RETURN\s0"
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.IX Item "\s-1SSL_ERROR_WANT_READ\s0, \s-1SSL_ERROR_WANT_WRITE\s0"
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.IX Item "\s-1SSL_ERROR_WANT_X509_LOOKUP\s0"
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.IX Item "\s-1SSL_ERROR_SYSCALL\s0"
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.IX Item "\s-1SSL_ERROR_SSL\s0"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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