curlopt_errorbuffer(3) [mojave man page]

CURLOPT_ERRORBUFFER(3)					     curl_easy_setopt options					    CURLOPT_ERRORBUFFER(3)

NAME

       CURLOPT_ERRORBUFFER - set error buffer for error messages

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_ERRORBUFFER, char *buf);

DESCRIPTION

       Pass  a	char  *  to a buffer that the libcurl may store human readable error messages in on failures or problems. This may be more helpful
       than just the return code from curl_easy_perform(3) and related functions. The buffer must be at least CURL_ERROR_SIZE bytes big.

       You must keep the associated buffer available until libcurl no longer needs it. Failing to do so will  cause  very  odd	behavior  or  even
       crashes. libcurl will need it until you call curl_easy_cleanup(3) or you set the same option again to use a different pointer.

       Consider CURLOPT_VERBOSE(3) and CURLOPT_DEBUGFUNCTION(3) to better debug and trace why errors happen.

       If the library does not return an error, the buffer may not have been touched. Do not rely on the contents in those cases.

DEFAULT

       NULL

PROTOCOLS

       All

EXAMPLE

       curl = curl_easy_init();
       if(curl) {
	 CURLcode res;
	 char errbuf[CURL_ERROR_SIZE];

	 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

	 /* provide a buffer to store errors in */
	 curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);

	 /* set the error buffer as empty before performing a request */
	 errbuf[0] = 0;

	 /* perform the request */
	 res = curl_easy_perform(curl);

	 /* if the request did not complete correctly, show the error
	 information. if no detailed error information was written to errbuf
	 show the more generic information from curl_easy_strerror instead.
	 */
	 if(res != CURLE_OK) {
	   size_t len = strlen(errbuf);
	   fprintf(stderr, "
libcurl: (%d) ", res);
	   if(len)
	     fprintf(stderr, "%s%s", errbuf,
		     ((errbuf[len - 1] != '
') ? "
" : ""));
	   else
	     fprintf(stderr, "%s
", curl_easy_strerror(res));
	 }
       }

AVAILABILITY

       Always

RETURN VALUE

       Returns CURLE_OK

SEE ALSO

       CURLOPT_DEBUGFUNCTION(3), CURLOPT_VERBOSE(3), curl_easy_strerror(3), curl_multi_strerror(3), curl_share_strerror(3)

libcurl 7.54.0							 February 03, 2016					    CURLOPT_ERRORBUFFER(3)

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CURLOPT_UPLOAD(3)					     curl_easy_setopt options						 CURLOPT_UPLOAD(3)

NAME

       CURLOPT_UPLOAD - enable data upload

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD, long upload);

DESCRIPTION

       The  long  parameter  upload  set  to 1 tells the library to prepare for and perform an upload. The CURLOPT_READDATA(3) and CURLOPT_INFILE-
       SIZE(3) or CURLOPT_INFILESIZE_LARGE(3) options are also interesting for uploads. If the protocol is HTTP, uploading  means  using  the  PUT
       request unless you tell libcurl otherwise.

       Using  PUT  with  HTTP  1.1  implies the use of a "Expect: 100-continue" header.  You can disable this header with CURLOPT_HTTPHEADER(3) as
       usual.

       If you use PUT to a HTTP 1.1 server, you can upload data without knowing the size before starting the transfer if you use chunked encoding.
       You enable this by adding a header like "Transfer-Encoding: chunked" with CURLOPT_HTTPHEADER(3). With HTTP 1.0 or without chunked transfer,
       you must specify the size.

DEFAULT

       0, default is download

PROTOCOLS

       Most

EXAMPLE

       CURL *curl = curl_easy_init();
       if(curl) {
	 /* we want to use our own read function */
	 curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);

	 /* enable uploading */
	 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);

	 /* specify target */
	 curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/to/newfile");

	 /* now specify which pointer to pass to our callback */
	 curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);

	 /* Set the size of the file to upload */
	 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)fsize);

	 /* Now run off and do what you've been told! */
	 curl_easy_perform(curl);
       }

AVAILABILITY

       Always

RETURN VALUE

       Returns CURLE_OK

SEE ALSO

       CURLOPT_PUT(3), CURLOPT_READFUNCTION(3), CURLOPT_INFILESIZE_LARGE(3),

libcurl 7.54.0							 February 03, 2016						 CURLOPT_UPLOAD(3)

Linux and UNIX Man Pages

curlopt_errorbuffer(3) [mojave man page]

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