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verify-examples.pl invokes 'gcc', which on macOS is clang. With -Wall -Wextra... -Werror -pedantic, clang rejects two patterns that GNU gcc accepts: - passing a char * to %p without a cast (-Wformat-pedantic): the C standard says %p expects void *, so cast explicitly in the CURLOPT_PROGRESSDATA, CURLOPT_PROGRESSFUNCTION, CURLOPT_XFERINFODATA and CURLOPT_XFERINFOFUNCTION examples - returning CURLcode result from main() when curl_easy_init() returned NULL leaves it uninitialized (-Wsometimes-uninitialized) in the CURLINFO_TLS_SSL_PTR example: initialize it to CURLE_OK like other man pages already do Closes #22638
82 lines
1.6 KiB
Markdown
82 lines
1.6 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_XFERINFODATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_NOPROGRESS (3)
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- CURLOPT_VERBOSE (3)
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- CURLOPT_XFERINFOFUNCTION (3)
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Protocol:
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- All
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Added-in: 7.32.0
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---
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# NAME
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CURLOPT_XFERINFODATA - pointer passed to the progress callback
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_XFERINFODATA, void *pointer);
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~~~
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# DESCRIPTION
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Pass a *pointer* that is untouched by libcurl and passed as the first
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argument in the progress callback set with CURLOPT_XFERINFOFUNCTION(3).
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This is an alias for CURLOPT_PROGRESSDATA(3).
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# DEFAULT
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NULL
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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struct progress {
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char *private;
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size_t size;
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};
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static int progress_cb(void *clientp,
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curl_off_t dltotal,
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curl_off_t dlnow,
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curl_off_t ultotal,
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curl_off_t ulnow)
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{
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struct progress *memory = clientp;
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printf("private ptr: %p\n", (void *)memory->private);
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/* use the values */
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return 0; /* all is good */
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}
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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struct progress data;
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/* pass struct to callback */
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curl_easy_setopt(curl, CURLOPT_XFERINFODATA, &data);
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curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, progress_cb);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_setopt(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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