From 139202bb68dcccd01eab031db5b331db1f999d3b Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Fri, 3 May 2019 15:44:49 +0200
Subject: [PATCH] CURLMOPT_TIMERFUNCTION.3: warn about the recursive risk [ci
 skip]

Reported-by: Ricardo Gomes

Bug: #3537
Closes #3836
---
 docs/libcurl/opts/CURLMOPT_TIMERFUNCTION.3 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/docs/libcurl/opts/CURLMOPT_TIMERFUNCTION.3 b/docs/libcurl/opts/CURLMOPT_TIMERFUNCTION.3
index d926d811d..344813fe8 100644
--- a/docs/libcurl/opts/CURLMOPT_TIMERFUNCTION.3
+++ b/docs/libcurl/opts/CURLMOPT_TIMERFUNCTION.3
@@ -54,6 +54,11 @@ The \fBuserp\fP pointer is set with \fICURLMOPT_TIMERDATA(3)\fP.
 
 The timer callback should return 0 on success, and -1 on error. This callback
 can be used instead of, or in addition to, \fIcurl_multi_timeout(3)\fP.
+
+\fBWARNING:\fP even if it feels tempting, avoid calling libcurl directly from
+within the callback itself when the \fBtimeout_ms\fP value is zero, since it
+risks triggering an unpleasant recursive behavior that immediately calls
+another call to the callback with a zero timeout...
 .SH DEFAULT
 NULL
 .SH PROTOCOLS
-- 
2.40.0