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-rw-r--r--docs/libcurl/curl_mime_data_cb.311
1 files changed, 9 insertions, 2 deletions
diff --git a/docs/libcurl/curl_mime_data_cb.3 b/docs/libcurl/curl_mime_data_cb.3
index f8421d5da..105968a0e 100644
--- a/docs/libcurl/curl_mime_data_cb.3
+++ b/docs/libcurl/curl_mime_data_cb.3
@@ -5,7 +5,7 @@
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
-.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+.\" * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
@@ -91,6 +91,12 @@ The callback function must return \fICURL_SEEKFUNC_OK\fP on success,
is free to work around the problem if possible. The latter can sometimes be
done by instead reading from the input or similar.
+Care must be taken if the part is bound to a curl easy handle that is later
+duplicated: the \fIarg\fP pointer argument is also duplicated, resulting in
+the pointed item to be shared between the original and the copied handle.
+In particular, special attention should be given to the \fIfreefunc\fP
+procedure code since it will be called twice with the same argument.
+
.SH AVAILABILITY
As long as at least one of HTTP, SMTP or IMAP is enabled. Added in 7.56.0.
.SH RETURN VALUE
@@ -157,4 +163,5 @@ int seek_callback(void *arg, curl_off_t offset, int origin)
.SH "SEE ALSO"
.BR curl_mime_addpart "(3),"
.BR curl_mime_data "(3),"
-.BR curl_mime_name "(3)"
+.BR curl_mime_name "(3),"
+.BR curl_easy_duphandle "(3)"