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-rw-r--r--libio/fileno.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/libio/fileno.c b/libio/fileno.c
index 7ff93e6..92334f1 100644
--- a/libio/fileno.c
+++ b/libio/fileno.c
@@ -32,8 +32,11 @@ fileno (fp)
{
CHECK_FILE (fp, EOF);
- if (!(fp->_flags & _IO_IS_FILEBUF))
- return EOF;
+ if (!(fp->_flags & _IO_IS_FILEBUF) || _IO_fileno (fp) < 0)
+ {
+ __set_errno (EBADF);
+ return -1;
+ }
return _IO_fileno (fp);
}