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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_INFILESIZE
+Section: 3
+Source: libcurl
+See-also:
+  - CURLINFO_CONTENT_LENGTH_UPLOAD_T (3)
+  - CURLOPT_INFILESIZE_LARGE (3)
+  - CURLOPT_UPLOAD (3)
+---
+
+# NAME
+
+CURLOPT_INFILESIZE - size of the input file to send off
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INFILESIZE, long filesize);
+~~~
+
+# DESCRIPTION
+
+When uploading a file to a remote site, *filesize* should be used to tell
+libcurl what the expected size of the input file is. This value must be passed
+as a long. See also CURLOPT_INFILESIZE_LARGE(3) for sending files larger
+than 2GB.
+
+For uploading using SCP, this option or CURLOPT_INFILESIZE_LARGE(3) is
+mandatory.
+
+To unset this value again, set it to -1.
+
+Using CURLOPT_UPLOAD(3) to an HTTP/1.1 server and this value set to -1, makes
+libcurl do a chunked transfer-encoded upload.
+
+When sending emails using SMTP, this command can be used to specify the
+optional SIZE parameter for the MAIL FROM command.
+
+This option does not limit how much data libcurl actually sends, as that is
+controlled entirely by what the read callback returns, but telling one value
+and sending a different amount may lead to errors.
+
+# DEFAULT
+
+Unset
+
+# PROTOCOLS
+
+Many
+
+# EXAMPLE
+
+~~~c
+
+#define FILE_SIZE 12345L
+
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    long uploadsize = FILE_SIZE;
+
+    curl_easy_setopt(curl, CURLOPT_URL,
+                     "ftp://example.com/destination.tar.gz");
+
+    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+    curl_easy_setopt(curl, CURLOPT_INFILESIZE, uploadsize);
+
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+SMTP support added in 7.23.0
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.