Merged revisions 290576 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r290576 | tilghman | 2010-10-06 08:49:19 -0500 (Wed, 06 Oct 2010) | 15 lines
  
  Merged revisions 290575 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
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    r290575 | tilghman | 2010-10-06 08:48:27 -0500 (Wed, 06 Oct 2010) | 8 lines
    
    Allow streaming audio from a pipe.
    
    (closes issue #18001)
     Reported by: jamicque
     Patches: 
           20100926__issue18001.diff.txt uploaded by tilghman (license 14)
     Tested by: jamicque
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@290577 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/file.c

@@ -961,10 +961,12 @@ int ast_streamfile(struct ast_channel *chan, const char *filename, const char *p
 	 * done this way because there is no where for ast_openstream_full to
 	 * return the file had no data. */
 	seekattempt = fseek(fs->f, -1, SEEK_END);
-	if (!seekattempt)
-		ast_seekstream(fs, 0, SEEK_SET);
-	else
+	if (seekattempt && errno == EINVAL) {
+		/* Zero-length file, as opposed to a pipe */
 		return 0;
+	} else {
+		ast_seekstream(fs, 0, SEEK_SET);
+	}
 
 	vfs = ast_openvstream(chan, filename, preflang);
 	if (vfs) {