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-rw-r--r--libio/iofopncook.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libio/iofopncook.c b/libio/iofopncook.c
index b845d29..978a7fa 100644
--- a/libio/iofopncook.c
+++ b/libio/iofopncook.c
@@ -189,6 +189,7 @@ _IO_fopencookie (cookie, mode, io_functions)
read_write = _IO_NO_READS|_IO_IS_APPENDING;
break;
default:
+ __set_errno (EINVAL);
return NULL;
}
if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))