Merged revisions 304097 via svnmerge from

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

................
  r304097 | seanbright | 2011-01-25 20:26:26 -0500 (Tue, 25 Jan 2011) | 19 lines
  
  Merged revisions 304096 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
  ........
    r304096 | seanbright | 2011-01-25 20:24:58 -0500 (Tue, 25 Jan 2011) | 12 lines
    
    Per the man page, setvbuf() must be called before any other operation on an open file.
    
    We use setvbuf() to associate a buffer with a stream, but we have already written
    to the open file.  This works (by chance) on Linux, but fails on other platforms,
    such as OpenSolaris.
    
    (closes issue #16610)
    Reported by: bklang
    Patches:
          setvbuf.patch uploaded by crjw (license 963)
    Tested by: bklang, asgaroth, efutch
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@304098 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/file.c

@@ -1113,6 +1113,11 @@ struct ast_filestream *ast_writefile(const char *filename, const char *type, con
 		if (fd > -1) {
 			errno = 0;
 			fs = get_filestream(f, bfile);
+			if (fs) {
+				if ((fs->write_buffer = ast_malloc(32768))) {
+					setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
+				}
+			}
 			if (!fs || rewrite_wrapper(fs, comment)) {
 				ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
 				close(fd);
@@ -1139,11 +1144,6 @@ struct ast_filestream *ast_writefile(const char *filename, const char *type, con
 			}
 			fs->vfs = NULL;
 			/* If truncated, we'll be at the beginning; if not truncated, then append */
-
-			if ((fs->write_buffer = ast_malloc(32768))){
-				setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
-			}
-
 			f->seek(fs, 0, SEEK_END);
 		} else if (errno != EEXIST) {
 			ast_log(LOG_WARNING, "Unable to open file %s: %s\n", fn, strerror(errno));