1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22 #include "tool_setup.h"
23
24 #define ENABLE_CURLX_PRINTF
25 /* use our own printf() functions */
26 #include "curlx.h"
27
28 #include "tool_cfgable.h"
29 #include "tool_cb_rea.h"
30 #include "tool_operate.h"
31
32 #include "memdebug.h" /* keep this as LAST include */
33
34 /*
35 ** callback for CURLOPT_READFUNCTION
36 */
37
tool_read_cb(char * buffer,size_t sz,size_t nmemb,void * userdata)38 size_t tool_read_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
39 {
40 ssize_t rc;
41 struct InStruct *in = userdata;
42
43 rc = read(in->fd, buffer, sz*nmemb);
44 if(rc < 0) {
45 if(errno == EAGAIN) {
46 errno = 0;
47 in->config->readbusy = TRUE;
48 return CURL_READFUNC_PAUSE;
49 }
50 /* since size_t is unsigned we can't return negative values fine */
51 rc = 0;
52 }
53 in->config->readbusy = FALSE;
54 return (size_t)rc;
55 }
56
57 /*
58 ** callback for CURLOPT_XFERINFOFUNCTION used to unpause busy reads
59 */
60
tool_readbusy_cb(void * clientp,curl_off_t dltotal,curl_off_t dlnow,curl_off_t ultotal,curl_off_t ulnow)61 int tool_readbusy_cb(void *clientp,
62 curl_off_t dltotal, curl_off_t dlnow,
63 curl_off_t ultotal, curl_off_t ulnow)
64 {
65 struct per_transfer *per = clientp;
66 struct OperationConfig *config = per->config;
67
68 (void)dltotal; /* unused */
69 (void)dlnow; /* unused */
70 (void)ultotal; /* unused */
71 (void)ulnow; /* unused */
72
73 if(config->readbusy) {
74 config->readbusy = FALSE;
75 curl_easy_pause(per->curl, CURLPAUSE_CONT);
76 }
77
78 return per->noprogress? 0 : CURL_PROGRESSFUNC_CONTINUE;
79 }
80