Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/curl_easy_pause.3 @ 22:d77477b4e151

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Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 .TH curl_easy_pause 3 "17 Dec 2007" "libcurl 7.18.0" "libcurl Manual"
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23 .SH NAME
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24 curl_easy_pause - pause and unpause a connection
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25 .SH SYNOPSIS
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26 .B #include <curl/curl.h>
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28 .BI "CURLcode curl_easy_pause(CURL *"handle ", int "bitmask " );"
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29
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30 .SH DESCRIPTION
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31 Using this function, you can explicitly mark a running connection to get
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32 paused, and you can unpause a connection that was previously paused.
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33
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34 A connection can be paused by using this function or by letting the read or
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35 the write callbacks return the proper magic return code
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36 (\fICURL_READFUNC_PAUSE\fP and \fICURL_WRITEFUNC_PAUSE\fP). A write callback
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37 that returns pause signals to the library that it couldn't take care of any
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38 data at all, and that data will then be delivered again to the callback when
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39 the writing is later unpaused.
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40
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41 While it may feel tempting, take care and notice that you cannot call this
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42 function from another thread. To unpause, you may for example call it from the
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43 progress callback (\fICURLOPT_PROGRESSFUNCTION(3)\fP), which gets called at
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44 least once per second, even if the connection is paused.
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45
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46 When this function is called to unpause reading, the chance is high that you
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47 will get your write callback called before this function returns.
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48
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49 The \fBhandle\fP argument is of course identifying the handle that operates on
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50 the connection you want to pause or unpause.
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51
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52 The \fBbitmask\fP argument is a set of bits that sets the new state of the
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53 connection. The following bits can be used:
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54 .IP CURLPAUSE_RECV
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55 Pause receiving data. There will be no data received on this connection until
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56 this function is called again without this bit set. Thus, the write callback
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57 (\fICURLOPT_WRITEFUNCTION(3)\fP) won't be called.
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58 .IP CURLPAUSE_SEND
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59 Pause sending data. There will be no data sent on this connection until this
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60 function is called again without this bit set. Thus, the read callback
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61 (\fICURLOPT_READFUNCTION(3)\fP) won't be called.
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62 .IP CURLPAUSE_ALL
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63 Convenience define that pauses both directions.
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64 .IP CURLPAUSE_CONT
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65 Convenience define that unpauses both directions.
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66 .SH RETURN VALUE
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67 CURLE_OK (zero) means that the option was set properly, and a non-zero return
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68 code means something wrong occurred after the new state was set. See the
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69 \fIlibcurl-errors(3)\fP man page for the full list with descriptions.
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70 .SH LIMITATIONS
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71 The pausing of transfers does not work with protocols that work without
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72 network connectivity, like FILE://. Trying to pause such a transfer, in any
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73 direction, will cause problems in the worst case or an error in the best case.
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74 .SH AVAILABILITY
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75 This function was added in libcurl 7.18.0. Before this version, there was no
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76 explicit support for pausing transfers.
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77 .SH "USAGE WITH THE MULTI-SOCKET INTERFACE"
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78 Before libcurl 7.32.0, when a specific handle was unpaused with this function,
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79 there was no particular forced rechecking or similar of the socket's state,
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80 which made the continuation of the transfer get delayed until next
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81 multi-socket call invoke or even longer. Alternatively, the user could
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82 forcibly call for example \fIcurl_multi_socket_all(3)\fP - with a rather hefty
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83 performance penalty.
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84
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85 Starting in libcurl 7.32.0, unpausing a transfer will schedule a timeout
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86 trigger for that handle 1 millisecond into the future, so that a
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87 curl_multi_socket_action( ... CURL_SOCKET_TIMEOUT) can be used immediately
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88 afterwards to get the transfer going again as desired.
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89 .SH "MEMORY USE"
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90 When pausing a read by returning the magic return code from a write callback,
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91 the read data is already in libcurl's internal buffers so it'll have to keep
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92 it in an allocated buffer until the reading is again unpaused using this
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93 function.
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94
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95 If the downloaded data is compressed and is asked to get uncompressed
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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96 automatically on download, libcurl will continue to uncompress the entire
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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97 downloaded chunk and it will cache the data uncompressed. This has the side-
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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98 effect that if you download something that is compressed a lot, it can result
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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99 in a very large data amount needing to be allocated to save the data during
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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100 the pause. This said, you should probably consider not using paused reading if
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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101 you allow libcurl to uncompress data automatically.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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102 .SH "SEE ALSO"
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parents:
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103 .BR curl_easy_cleanup "(3), " curl_easy_reset "(3)"