1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 #include "tool_setup.h"
25
26 #ifdef HAVE_SYS_SELECT_H
27 #include <sys/select.h>
28 #endif
29
30 #define ENABLE_CURLX_PRINTF
31 /* use our own printf() functions */
32 #include "curlx.h"
33
34 #include "tool_cfgable.h"
35 #include "tool_cb_rea.h"
36 #include "tool_operate.h"
37 #include "tool_util.h"
38 #include "tool_msgs.h"
39 #include "tool_sleep.h"
40
41 #include "memdebug.h" /* keep this as LAST include */
42
43 /*
44 ** callback for CURLOPT_READFUNCTION
45 */
46
tool_read_cb(char * buffer,size_t sz,size_t nmemb,void * userdata)47 size_t tool_read_cb(char *buffer, size_t sz, size_t nmemb, void *userdata)
48 {
49 ssize_t rc = 0;
50 struct per_transfer *per = userdata;
51 struct OperationConfig *config = per->config;
52
53 if((per->uploadfilesize != -1) &&
54 (per->uploadedsofar == per->uploadfilesize)) {
55 /* done */
56 return 0;
57 }
58
59 if(config->timeout_ms) {
60 struct timeval now = tvnow();
61 long msdelta = tvdiff(now, per->start);
62
63 if(msdelta > config->timeout_ms)
64 /* timeout */
65 return 0;
66 #ifndef _WIN32
67 /* this logic waits on read activity on a file descriptor that is not a
68 socket which makes it not work with select() on Windows */
69 else {
70 fd_set bits;
71 struct timeval timeout;
72 long wait = config->timeout_ms - msdelta;
73
74 /* wait this long at the most */
75 timeout.tv_sec = wait/1000;
76 timeout.tv_usec = (int)((wait%1000)*1000);
77
78 FD_ZERO(&bits);
79 FD_SET(per->infd, &bits);
80 if(!select(per->infd + 1, &bits, NULL, NULL, &timeout))
81 return 0; /* timeout */
82 }
83 #endif
84 }
85
86 rc = read(per->infd, buffer, sz*nmemb);
87 if(rc < 0) {
88 if(errno == EAGAIN) {
89 errno = 0;
90 config->readbusy = TRUE;
91 return CURL_READFUNC_PAUSE;
92 }
93 /* since size_t is unsigned we can't return negative values fine */
94 rc = 0;
95 }
96 if((per->uploadfilesize != -1) &&
97 (per->uploadedsofar + rc > per->uploadfilesize)) {
98 /* do not allow uploading more than originally set out to do */
99 curl_off_t delta = per->uploadedsofar + rc - per->uploadfilesize;
100 warnf(per->config->global, "File size larger in the end than when "
101 "started. Dropping at least %" CURL_FORMAT_CURL_OFF_T " bytes",
102 delta);
103 rc = (ssize_t)(per->uploadfilesize - per->uploadedsofar);
104 }
105 config->readbusy = FALSE;
106
107 /* when select() returned zero here, it timed out */
108 return (size_t)rc;
109 }
110
111 /*
112 ** callback for CURLOPT_XFERINFOFUNCTION used to unpause busy reads
113 */
114
tool_readbusy_cb(void * clientp,curl_off_t dltotal,curl_off_t dlnow,curl_off_t ultotal,curl_off_t ulnow)115 int tool_readbusy_cb(void *clientp,
116 curl_off_t dltotal, curl_off_t dlnow,
117 curl_off_t ultotal, curl_off_t ulnow)
118 {
119 struct per_transfer *per = clientp;
120 struct OperationConfig *config = per->config;
121
122 (void)dltotal; /* unused */
123 (void)dlnow; /* unused */
124 (void)ultotal; /* unused */
125 (void)ulnow; /* unused */
126
127 if(config->readbusy) {
128 /* lame code to keep the rate down because the input might not deliver
129 anything, get paused again and come back here immediately */
130 static long rate = 500;
131 static struct timeval prev;
132 static curl_off_t ulprev;
133
134 if(ulprev == ulnow) {
135 /* it did not upload anything since last call */
136 struct timeval now = tvnow();
137 if(prev.tv_sec)
138 /* get a rolling average rate */
139 /* rate = rate - rate/4 + tvdiff(now, prev)/4; */
140 rate -= rate/4 - tvdiff(now, prev)/4;
141 prev = now;
142 }
143 else {
144 rate = 50;
145 ulprev = ulnow;
146 }
147 if(rate >= 50) {
148 /* keeps the looping down to 20 times per second in the crazy case */
149 config->readbusy = FALSE;
150 curl_easy_pause(per->curl, CURLPAUSE_CONT);
151 }
152 else
153 /* sleep half a period */
154 tool_go_sleep(25);
155 }
156
157 return per->noprogress? 0 : CURL_PROGRESSFUNC_CONTINUE;
158 }
159
