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3rd-party/curl-7.52.1/docs/libcurl/opts/CURLOPT_WRITEFUNCTION.3

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+.\" * This software is licensed as described in the file COPYING, which
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+.\"
+.TH CURLOPT_WRITEFUNCTION 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
+.SH NAME
+CURLOPT_WRITEFUNCTION \- set callback for writing received data
+.SH SYNOPSIS
+.nf
+#include <curl/curl.h>
+
+size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata);
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEFUNCTION, write_callback);
+.SH DESCRIPTION
+Pass a pointer to your callback function, which should match the prototype
+shown above.
+
+This callback function gets called by libcurl as soon as there is data
+received that needs to be saved.  \fIptr\fP points to the delivered data, and
+the size of that data is \fIsize\fP multiplied with \fInmemb\fP.
+
+The callback function will be passed as much data as possible in all invokes,
+but you must not make any assumptions. It may be one byte, it may be
+thousands. The maximum amount of body data that will be passed to the write
+callback is defined in the curl.h header file: \fICURL_MAX_WRITE_SIZE\fP (the
+usual default is 16K). If \fICURLOPT_HEADER(3)\fP is enabled, which makes
+header data get passed to the write callback, you can get up to
+\fICURL_MAX_HTTP_HEADER\fP bytes of header data passed into it. This usually
+means 100K.
+
+This function may be called with zero bytes data if the transferred file is
+empty.
+
+The data passed to this function will not be zero terminated!
+
+Set the \fIuserdata\fP argument with the \fICURLOPT_WRITEDATA(3)\fP option.
+
+Your callback should return the number of bytes actually taken care of. If
+that amount differs from the amount passed to your callback function, it'll
+signal an error condition to the library. This will cause the transfer to get
+aborted and the libcurl function used will return \fICURLE_WRITE_ERROR\fP.
+
+If your callback function returns CURL_WRITEFUNC_PAUSE it will cause this
+transfer to become paused.  See \fIcurl_easy_pause(3)\fP for further details.
+
+Set this option to NULL to get the internal default function used instead of
+your callback. The internal default function will write the data to the FILE *
+given with \fICURLOPT_WRITEDATA(3)\fP.
+.SH DEFAULT
+libcurl will use 'fwrite' as a callback by default.
+.SH PROTOCOLS
+For all protocols
+.SH AVAILABILITY
+Support for the CURL_WRITEFUNC_PAUSE return code was added in version 7.18.0.
+.SH RETURN VALUE
+This will return CURLE_OK.
+.SH EXAMPLE
+A common technique is to use this callback to store the incoming data into a
+dynamically growing allocated buffer. Like in the getinmemory example:
+https://curl.haxx.se/libcurl/c/getinmemory.html
+.SH "SEE ALSO"
+.BR CURLOPT_WRITEDATA "(3), " CURLOPT_READFUNCTION "(3), "