98 lines
4.2 KiB
Groff
98 lines
4.2 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) 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 https://curl.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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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.TH libcurl-env-dbg 3 "18 September 2023" "libcurl" "libcurl"
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.SH NAME
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libcurl-env-dbg \- environment variables libcurl DEBUGBUILD understands
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.SH DESCRIPTION
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This is a set of variables only recognized and used if libcurl was built
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"debug enabled", which should never be true for a library used in production.
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These variables are intended for internal use only, subject to change and have
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many effects on the behavior of libcurl. Refer to the source code to determine
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how exactly they are being used.
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.RS
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.IP "CURL_ALTSVC_HTTP"
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Bypass the AltSvc HTTPS protocol restriction if this variable exists.
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.IP "CURL_DBG_SOCK_RBLOCK"
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The percentage of recv() calls that should be answered with a EAGAIN at random.
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For TCP/UNIX sockets.
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.IP "CURL_DBG_SOCK_RMAX"
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The maximum data that shall be received from the network in one recv() call.
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For TCP/UNIX sockets. This is applied to every recv.
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Example: \fBCURL_DBG_SOCK_RMAX=400\fP means recv buffer size is limited to a
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maximum of 400 bytes.
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.IP "CURL_DBG_SOCK_WBLOCK"
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The percentage of send() calls that should be answered with a EAGAIN at random.
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For TCP/UNIX sockets.
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.IP "CURL_DBG_SOCK_WPARTIAL"
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The percentage of data that shall be written to the network. For TCP/UNIX
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sockets. This is applied to every send.
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Example: \fBCURL_DBG_SOCK_WPARTIAL=80\fP means a send with 1000 bytes would
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only send 800.
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.IP "CURL_DBG_QUIC_WBLOCK"
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The percentage of send() calls that should be answered with EAGAIN at random.
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QUIC only.
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.IP "CURL_DEBUG"
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Trace logging behavior as an alternative to calling \fIcurl_global_trace(3)\fP.
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Example: \fBCURL_DEBUG=http/2\fP means trace details about HTTP/2 handling.
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.IP "CURL_DEBUG_SIZE"
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Fake the size returned by CURLINFO_HEADER_SIZE and CURLINFO_REQUEST_SIZE.
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.IP "CURL_GETHOSTNAME"
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Fake the local machine's unqualified hostname for NTLM and SMTP.
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.IP "CURL_HSTS_HTTP"
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Bypass the HSTS HTTPS protocol restriction if this variable exists.
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.IP "CURL_FORCETIME"
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A time of 0 is used for AWS signatures and NTLM if this variable exists.
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.IP "CURL_ENTROPY"
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A fixed faked value to use instead of a proper random number so that functions
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in libcurl that are otherwise getting random outputs can be tested for what
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they generate.
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.IP "CURL_SMALLREQSEND"
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An alternative size of HTTP data to be sent at a time only if smaller than the
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current.
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.IP "CURL_SMALLSENDS"
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An alternative size of socket data to be sent at a time only if smaller than
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the current.
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.IP "CURL_TIME"
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Fake unix timestamp to use for AltSvc, HSTS and CURLINFO variables that are
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time related.
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This variable can also be used to fake the data returned by some CURLINFO
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variables that are not time-related (such as CURLINFO_LOCAL_PORT), and in that
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case the value is not a timestamp.
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.IP "CURL_TRACE"
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LDAP tracing is enabled if this variable exists and its value is 1 or greater.
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OpenLDAP tracing is separate. Refer to CURL_OPENLDAP_TRACE.
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.IP "CURL_NTLM_WB_FILE"
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Debug-version of the \fIntlm-wb\fP executable.
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.IP "CURL_OPENLDAP_TRACE"
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OpenLDAP tracing is enabled if this variable exists and its value is 1 or
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greater. There's a number of debug levels, refer to \fIopenldap.c\fP comments.
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.RE
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.SH "SEE ALSO"
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.BR libcurl-env (3)
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