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0f147887b0
Introducing a number of options to the multi interface that allows for multiple pipelines to the same host, in order to optimize the balance between the penalty for opening new connections and the potential pipelining latency. Two new options for limiting the number of connections: CURLMOPT_MAX_HOST_CONNECTIONS - Limits the number of running connections to the same host. When adding a handle that exceeds this limit, that handle will be put in a pending state until another handle is finished, so we can reuse the connection. CURLMOPT_MAX_TOTAL_CONNECTIONS - Limits the number of connections in total. When adding a handle that exceeds this limit, that handle will be put in a pending state until another handle is finished. The free connection will then be reused, if possible, or closed if the pending handle can't reuse it. Several new options for pipelining: CURLMOPT_MAX_PIPELINE_LENGTH - Limits the pipeling length. If a pipeline is "full" when a connection is to be reused, a new connection will be opened if the CURLMOPT_MAX_xxx_CONNECTIONS limits allow it. If not, the handle will be put in a pending state until a connection is ready (either free or a pipe got shorter). CURLMOPT_CONTENT_LENGTH_PENALTY_SIZE - A pipelined connection will not be reused if it is currently processing a transfer with a content length that is larger than this. CURLMOPT_CHUNK_LENGTH_PENALTY_SIZE - A pipelined connection will not be reused if it is currently processing a chunk larger than this. CURLMOPT_PIPELINING_SITE_BL - A blacklist of hosts that don't allow pipelining. CURLMOPT_PIPELINING_SERVER_BL - A blacklist of server types that don't allow pipelining. See the curl_multi_setopt() man page for details.
293 lines
13 KiB
Groff
293 lines
13 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at http://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH libcurl-errors 3 "1 Jan 2010" "libcurl 7.20.0" "libcurl errors"
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.SH NAME
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libcurl-errors \- error codes in libcurl
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.SH DESCRIPTION
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This man page includes most, if not all, available error codes in libcurl.
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Why they occur and possibly what you can do to fix the problem are also included.
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.SH "CURLcode"
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Almost all "easy" interface functions return a CURLcode error code. No matter
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what, using the \fIcurl_easy_setopt(3)\fP option \fICURLOPT_ERRORBUFFER\fP is
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a good idea as it will give you a human readable error string that may offer
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more details about the cause of the error than just the error code.
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\fIcurl_easy_strerror(3)\fP can be called to get an error string from a
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given CURLcode number.
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CURLcode is one of the following:
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.IP "CURLE_OK (0)"
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All fine. Proceed as usual.
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.IP "CURLE_UNSUPPORTED_PROTOCOL (1)"
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The URL you passed to libcurl used a protocol that this libcurl does not
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support. The support might be a compile-time option that you didn't use, it
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can be a misspelled protocol string or just a protocol libcurl has no code
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for.
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.IP "CURLE_FAILED_INIT (2)"
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Very early initialization code failed. This is likely to be an internal error
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or problem, or a resource problem where something fundamental couldn't get
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done at init time.
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.IP "CURLE_URL_MALFORMAT (3)"
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The URL was not properly formatted.
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.IP "CURLE_NOT_BUILT_IN (4)"
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A requested feature, protocol or option was not found built-in in this libcurl
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due to a build-time decision. This means that a feature or option was not
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enabled or explicitly disabled when libcurl was built and in order to get it
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to function you have to get a rebuilt libcurl.
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.IP "CURLE_COULDNT_RESOLVE_PROXY (5)"
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Couldn't resolve proxy. The given proxy host could not be resolved.
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.IP "CURLE_COULDNT_RESOLVE_HOST (6)"
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Couldn't resolve host. The given remote host was not resolved.
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.IP "CURLE_COULDNT_CONNECT (7)"
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Failed to connect() to host or proxy.
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.IP "CURLE_FTP_WEIRD_SERVER_REPLY (8)"
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After connecting to a FTP server, libcurl expects to get a certain reply
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back. This error code implies that it got a strange or bad reply. The given
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remote server is probably not an OK FTP server.
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.IP "CURLE_REMOTE_ACCESS_DENIED (9)"
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We were denied access to the resource given in the URL. For FTP, this occurs
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while trying to change to the remote directory.
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.IP "CURLE_FTP_ACCEPT_FAILED (10)"
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While waiting for the server to connect back when an active FTP session is
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used, an error code was sent over the control connection or similar.
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.IP "CURLE_FTP_WEIRD_PASS_REPLY (11)"
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After having sent the FTP password to the server, libcurl expects a proper
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reply. This error code indicates that an unexpected code was returned.
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.IP "CURLE_FTP_ACCEPT_TIMEOUT (12)"
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During an active FTP session while waiting for the server to connect, the
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\fICURLOPT_ACCEPTTIMOUT_MS\fP (or the internal default) timeout expired.
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.IP "CURLE_FTP_WEIRD_PASV_REPLY (13)"
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libcurl failed to get a sensible result back from the server as a response to
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either a PASV or a EPSV command. The server is flawed.
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.IP "CURLE_FTP_WEIRD_227_FORMAT (14)"
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FTP servers return a 227-line as a response to a PASV command. If libcurl
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fails to parse that line, this return code is passed back.
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.IP "CURLE_FTP_CANT_GET_HOST (15)"
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An internal failure to lookup the host used for the new connection.
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.IP "CURLE_FTP_COULDNT_SET_TYPE (17)"
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Received an error when trying to set the transfer mode to binary or ASCII.
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.IP "CURLE_PARTIAL_FILE (18)"
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A file transfer was shorter or larger than expected. This happens when the
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server first reports an expected transfer size, and then delivers data that
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doesn't match the previously given size.
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.IP "CURLE_FTP_COULDNT_RETR_FILE (19)"
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This was either a weird reply to a 'RETR' command or a zero byte transfer
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complete.
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.IP "CURLE_QUOTE_ERROR (21)"
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When sending custom "QUOTE" commands to the remote server, one of the commands
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returned an error code that was 400 or higher (for FTP) or otherwise
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indicated unsuccessful completion of the command.
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.IP "CURLE_HTTP_RETURNED_ERROR (22)"
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This is returned if CURLOPT_FAILONERROR is set TRUE and the HTTP server
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returns an error code that is >= 400.
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.IP "CURLE_WRITE_ERROR (23)"
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An error occurred when writing received data to a local file, or an error was
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returned to libcurl from a write callback.
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.IP "CURLE_UPLOAD_FAILED (25)"
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Failed starting the upload. For FTP, the server typically denied the STOR
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command. The error buffer usually contains the server's explanation for this.
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.IP "CURLE_READ_ERROR (26)"
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There was a problem reading a local file or an error returned by the read
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callback.
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.IP "CURLE_OUT_OF_MEMORY (27)"
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A memory allocation request failed. This is serious badness and
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things are severely screwed up if this ever occurs.
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.IP "CURLE_OPERATION_TIMEDOUT (28)"
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Operation timeout. The specified time-out period was reached according to the
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conditions.
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.IP "CURLE_FTP_PORT_FAILED (30)"
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The FTP PORT command returned error. This mostly happens when you haven't
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specified a good enough address for libcurl to use. See \fICURLOPT_FTPPORT\fP.
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.IP "CURLE_FTP_COULDNT_USE_REST (31)"
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The FTP REST command returned error. This should never happen if the server is
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sane.
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.IP "CURLE_RANGE_ERROR (33)"
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The server does not support or accept range requests.
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.IP "CURLE_HTTP_POST_ERROR (34)"
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This is an odd error that mainly occurs due to internal confusion.
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.IP "CURLE_SSL_CONNECT_ERROR (35)"
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A problem occurred somewhere in the SSL/TLS handshake. You really want the
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error buffer and read the message there as it pinpoints the problem slightly
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more. Could be certificates (file formats, paths, permissions), passwords, and
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others.
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.IP "CURLE_BAD_DOWNLOAD_RESUME (36)"
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The download could not be resumed because the specified offset was out of the
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file boundary.
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.IP "CURLE_FILE_COULDNT_READ_FILE (37)"
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A file given with FILE:// couldn't be opened. Most likely because the file
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path doesn't identify an existing file. Did you check file permissions?
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.IP "CURLE_LDAP_CANNOT_BIND (38)"
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LDAP cannot bind. LDAP bind operation failed.
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.IP "CURLE_LDAP_SEARCH_FAILED (39)"
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LDAP search failed.
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.IP "CURLE_FUNCTION_NOT_FOUND (41)"
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Function not found. A required zlib function was not found.
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.IP "CURLE_ABORTED_BY_CALLBACK (42)"
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Aborted by callback. A callback returned "abort" to libcurl.
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.IP "CURLE_BAD_FUNCTION_ARGUMENT (43)"
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Internal error. A function was called with a bad parameter.
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.IP "CURLE_INTERFACE_FAILED (45)"
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Interface error. A specified outgoing interface could not be used. Set which
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interface to use for outgoing connections' source IP address with
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CURLOPT_INTERFACE.
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.IP "CURLE_TOO_MANY_REDIRECTS (47)"
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Too many redirects. When following redirects, libcurl hit the maximum amount.
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Set your limit with CURLOPT_MAXREDIRS.
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.IP "CURLE_UNKNOWN_OPTION (48)"
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An option passed to libcurl is not recognized/known. Refer to the appropriate
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documentation. This is most likely a problem in the program that uses
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libcurl. The error buffer might contain more specific information about which
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exact option it concerns.
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.IP "CURLE_TELNET_OPTION_SYNTAX (49)"
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A telnet option string was Illegally formatted.
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.IP "CURLE_PEER_FAILED_VERIFICATION (51)"
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The remote server's SSL certificate or SSH md5 fingerprint was deemed not OK.
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.IP "CURLE_GOT_NOTHING (52)"
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Nothing was returned from the server, and under the circumstances, getting
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nothing is considered an error.
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.IP "CURLE_SSL_ENGINE_NOTFOUND (53)"
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The specified crypto engine wasn't found.
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.IP "CURLE_SSL_ENGINE_SETFAILED (54)"
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Failed setting the selected SSL crypto engine as default!
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.IP "CURLE_SEND_ERROR (55)"
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Failed sending network data.
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.IP "CURLE_RECV_ERROR (56)"
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Failure with receiving network data.
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.IP "CURLE_SSL_CERTPROBLEM (58)"
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problem with the local client certificate.
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.IP "CURLE_SSL_CIPHER (59)"
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Couldn't use specified cipher.
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.IP "CURLE_SSL_CACERT (60)"
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Peer certificate cannot be authenticated with known CA certificates.
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.IP "CURLE_BAD_CONTENT_ENCODING (61)"
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Unrecognized transfer encoding.
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.IP "CURLE_LDAP_INVALID_URL (62)"
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Invalid LDAP URL.
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.IP "CURLE_FILESIZE_EXCEEDED (63)"
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Maximum file size exceeded.
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.IP "CURLE_USE_SSL_FAILED (64)"
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Requested FTP SSL level failed.
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.IP "CURLE_SEND_FAIL_REWIND (65)"
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When doing a send operation curl had to rewind the data to retransmit, but the
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rewinding operation failed.
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.IP "CURLE_SSL_ENGINE_INITFAILED (66)"
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Initiating the SSL Engine failed.
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.IP "CURLE_LOGIN_DENIED (67)"
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The remote server denied curl to login (Added in 7.13.1)
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.IP "CURLE_TFTP_NOTFOUND (68)"
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File not found on TFTP server.
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.IP "CURLE_TFTP_PERM (69)"
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Permission problem on TFTP server.
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.IP "CURLE_REMOTE_DISK_FULL (70)"
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Out of disk space on the server.
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.IP "CURLE_TFTP_ILLEGAL (71)"
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Illegal TFTP operation.
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.IP "CURLE_TFTP_UNKNOWNID (72)"
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Unknown TFTP transfer ID.
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.IP "CURLE_REMOTE_FILE_EXISTS (73)"
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File already exists and will not be overwritten.
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.IP "CURLE_TFTP_NOSUCHUSER (74)"
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This error should never be returned by a properly functioning TFTP server.
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.IP "CURLE_CONV_FAILED (75)"
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Character conversion failed.
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.IP "CURLE_CONV_REQD (76)"
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Caller must register conversion callbacks.
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.IP "CURLE_SSL_CACERT_BADFILE (77)"
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Problem with reading the SSL CA cert (path? access rights?)
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.IP "CURLE_REMOTE_FILE_NOT_FOUND (78)"
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The resource referenced in the URL does not exist.
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.IP "CURLE_SSH (79)"
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An unspecified error occurred during the SSH session.
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.IP "CURLE_SSL_SHUTDOWN_FAILED (80)"
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Failed to shut down the SSL connection.
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.IP "CURLE_AGAIN (81)"
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Socket is not ready for send/recv wait till it's ready and try again. This
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return code is only returned from \fIcurl_easy_recv(3)\fP and
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\fIcurl_easy_send(3)\fP (Added in 7.18.2)
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.IP "CURLE_SSL_CRL_BADFILE (82)"
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Failed to load CRL file (Added in 7.19.0)
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.IP "CURLE_SSL_ISSUER_ERROR (83)"
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Issuer check failed (Added in 7.19.0)
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.IP "CURLE_FTP_PRET_FAILED (84)"
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The FTP server does not understand the PRET command at all or does not support
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the given argument. Be careful when using \fICURLOPT_CUSTOMREQUEST\fP, a
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custom LIST command will be sent with PRET CMD before PASV as well. (Added in
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7.20.0)
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.IP "CURLE_RTSP_CSEQ_ERROR (85)"
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Mismatch of RTSP CSeq numbers.
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.IP "CURLE_RTSP_SESSION_ERROR (86)"
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Mismatch of RTSP Session Identifiers.
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.IP "CURLE_FTP_BAD_FILE_LIST (87)"
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Unable to parse FTP file list (during FTP wildcard downloading).
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.IP "CURLE_CHUNK_FAILED (88)"
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Chunk callback reported error.
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.IP "CURLE_NO_CONNECTION_AVAILABLE (89)"
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(For internal use only, will never be returned by libcurl) No connection
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available, the session will be queued. (added in 7.30.0)
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.IP "CURLE_OBSOLETE*"
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These error codes will never be returned. They were used in an old libcurl
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version and are currently unused.
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.SH "CURLMcode"
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This is the generic return code used by functions in the libcurl multi
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interface. Also consider \fIcurl_multi_strerror(3)\fP.
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.IP "CURLM_CALL_MULTI_PERFORM (-1)"
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This is not really an error. It means you should call
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\fIcurl_multi_perform(3)\fP again without doing select() or similar in
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between. Before version 7.20.0 this could be returned by
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\fIcurl_multi_perform(3)\fP, but in later versions this return code is never
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used.
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.IP "CURLM_OK (0)"
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Things are fine.
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.IP "CURLM_BAD_HANDLE (1)"
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The passed-in handle is not a valid CURLM handle.
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.IP "CURLM_BAD_EASY_HANDLE (2)"
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An easy handle was not good/valid. It could mean that it isn't an easy handle
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at all, or possibly that the handle already is in used by this or another
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multi handle.
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.IP "CURLM_OUT_OF_MEMORY (3)"
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You are doomed.
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.IP "CURLM_INTERNAL_ERROR (4)"
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This can only be returned if libcurl bugs. Please report it to us!
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.IP "CURLM_BAD_SOCKET (5)"
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The passed-in socket is not a valid one that libcurl already knows about.
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(Added in 7.15.4)
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.IP "CURLM_UNKNOWN_OPTION (6)"
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curl_multi_setopt() with unsupported option
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(Added in 7.15.4)
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.SH "CURLSHcode"
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The "share" interface will return a CURLSHcode to indicate when an error has
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occurred. Also consider \fIcurl_share_strerror(3)\fP.
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.IP "CURLSHE_OK (0)"
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All fine. Proceed as usual.
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.IP "CURLSHE_BAD_OPTION (1)"
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An invalid option was passed to the function.
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.IP "CURLSHE_IN_USE (2)"
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The share object is currently in use.
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.IP "CURLSHE_INVALID (3)"
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An invalid share object was passed to the function.
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.IP "CURLSHE_NOMEM (4)"
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Not enough memory was available.
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(Added in 7.12.0)
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.IP "CURLSHE_NOT_BUILT_IN (5)"
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The requested sharing could not be done because the library you use don't have
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that particular feature enabled. (Added in 7.23.0)
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