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-rw-r--r--libio/fileops.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libio/fileops.c b/libio/fileops.c
index 58c9e985e4..1c1113e339 100644
--- a/libio/fileops.c
+++ b/libio/fileops.c
@@ -247,6 +247,7 @@ _IO_new_file_fopen (FILE *fp, const char *filename, const char *mode,
       switch (*++mode)
 	{
 	case '\0':
+	case ',':
 	  break;
 	case '+':
 	  omode = O_RDWR;