Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_easy_recv.3 @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH curl_easy_recv 3 "29 April 2008" "libcurl 7.18.2" "libcurl Manual"
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24 .SH NAME
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25 curl_easy_recv - receives raw data on an "easy" connection
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26 .SH SYNOPSIS
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27 .B #include <curl/easy.h>
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28 .sp
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29 .BI "CURLcode curl_easy_recv( CURL *" curl ", void *" buffer ","
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30 .BI "size_t " buflen ", size_t *" n ");"
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31 .ad
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32 .SH DESCRIPTION
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33 This function receives raw data from the established connection. You may use
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34 it together with \fIcurl_easy_send(3)\fP to implement custom protocols using
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35 libcurl. This functionality can be particularly useful if you use proxies
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36 and/or SSL encryption: libcurl will take care of proxy negotiation and
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37 connection set-up.
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38
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39 \fBbuffer\fP is a pointer to your buffer that will get the received
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40 data. \fBbuflen\fP is the maximum amount of data you can get in that
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41 buffer. The variable \fBn\fP points to will receive the number of received
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42 bytes.
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43
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44 To establish the connection, set \fICURLOPT_CONNECT_ONLY(3)\fP option before
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45 calling \fIcurl_easy_perform(3)\fP or \fIcurl_multi_perform(3)\fP. Note that
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46 \fIcurl_easy_recv(3)\fP does not work on connections that were created without
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47 this option.
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48
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49 The call will return \fBCURLE_AGAIN\fP if there is no data to read - the
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50 socket is used in non-blocking mode internally. When \fBCURLE_AGAIN\fP is
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51 returned, use your operating system facilities like \fIselect(2)\fP to wait
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52 for data. The socket may be obtained using \fIcurl_easy_getinfo(3)\fP with
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53 \fICURLINFO_ACTIVESOCKET(3)\fP.
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55 Wait on the socket only if \fIcurl_easy_recv(3)\fP returns \fBCURLE_AGAIN\fP.
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56 The reason for this is libcurl or the SSL library may internally cache some
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57 data, therefore you should call \fIcurl_easy_recv(3)\fP until all data is
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58 read which would include any cached data.
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60 Furthermore if you wait on the socket and it tells you there is data to read,
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61 \fIcurl_easy_recv(3)\fP may return \fBCURLE_AGAIN\fP if the only data that was
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62 read was for internal SSL processing, and no other data is available.
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64 .SH AVAILABILITY
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65 Added in 7.18.2.
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66 .SH RETURN VALUE
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67 On success, returns \fBCURLE_OK\fP, stores the received data into
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68 \fBbuffer\fP, and the number of bytes it actually read into \fB*n\fP.
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69
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70 On failure, returns the appropriate error code.
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72 The function may return \fBCURLE_AGAIN\fP. In this case, use your operating
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73 system facilities to wait until data can be read, and retry.
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75 Reading exactly 0 bytes indicates a closed connection.
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76
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77 If there's no socket available to use from the previous transfer, this function
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78 returns \fBCURLE_UNSUPPORTED_PROTOCOL\fP.
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79 .SH EXAMPLE
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80 See \fBsendrecv.c\fP in \fBdocs/examples\fP directory for usage example.
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81 .SH "SEE ALSO"
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82 .BR curl_easy_setopt "(3), " curl_easy_perform "(3), "
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83 .BR curl_easy_getinfo "(3), "
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84 .BR curl_easy_send "(3) "