nobu	2018-03-05 15:56:09 +0900 (Mon, 05 Mar 2018)

  New Revision: 62661

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62661

  Log:
    Tiny Fix for ASYNC BUG error message copying
    
    The previous logic would overwrite the error message, replacing the message with the `fd` number.
    
    This tiny update will print the message in full.
    
    (I'm trying to debug an issue with the timer thread on my machine and the lack of error messages makes it really hard).
    
    [Fix GH-1829]
    
    From: Bo <bo@b...>

  Modified files:
    trunk/thread_pthread.c
Index: thread_pthread.c
===================================================================
--- thread_pthread.c	(revision 62660)
+++ thread_pthread.c	(revision 62661)
@@ -1212,7 +1212,7 @@ async_bug_fd(const char *mesg, int errno https://github.com/ruby/ruby/blob/trunk/thread_pthread.c#L1212
     char buff[64];
     size_t n = strlcpy(buff, mesg, sizeof(buff));
     if (n < sizeof(buff)-3) {
-	ruby_snprintf(buff, sizeof(buff)-n, "(%d)", fd);
+	ruby_snprintf(buff+n, sizeof(buff)-n, "(%d)", fd);
     }
     rb_async_bug_errno(buff, errno_arg);
 }

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