CURLOPT_UPLOAD(3) Library Functions Manual CURLOPT_UPLOAD(3)
NAME
CURLOPT_UPLOAD - 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_INFILESIZE(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 an HTTP 1.1 server, you can upload data without
knowing the size before starting the transfer. The library enables this
by adding a header "Transfer-Encoding: chunked". With HTTP 1.0 or if
you prefer not to use chunked transfer, you must specify the size of
the data with CURLOPT_INFILESIZE(3) or CURLOPT_INFILESIZE_LARGE(3).
DEFAULT
0
PROTOCOLS
This functionality affects all supported protocols
EXAMPLE
static size_t read_cb(char *ptr, size_t size, size_t nmemb, void *userdata)
{
FILE *src = userdata;
/* copy as much data as possible into the 'ptr' buffer, but no more than
'size' * 'nmemb' bytes */
size_t retcode = fread(ptr, size, nmemb, src);
return retcode;
}
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
FILE *src = fopen("local-file", "r");
curl_off_t fsize; /* set this to the size of the input file */
/* we want to use our own read function */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_cb);
/* 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, 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 have been told! */
curl_easy_perform(curl);
}
}
AVAILABILITY
Added in curl 7.1
RETURN VALUE
Returns CURLE_OK
SEE ALSO
CURLOPT_INFILESIZE_LARGE(3), CURLOPT_PUT(3), CURLOPT_READFUNCTION(3)
libcurl 2024-08-05 CURLOPT_UPLOAD(3)
curl 8.9.1 - Generated Mon Aug 12 16:50:30 CDT 2024