diff options
Diffstat (limited to 'libio/ioungetc.c')
| -rw-r--r-- | libio/ioungetc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libio/ioungetc.c b/libio/ioungetc.c index 951064fa12..917cad8abb 100644 --- a/libio/ioungetc.c +++ b/libio/ioungetc.c @@ -33,6 +33,8 @@ _IO_ungetc (int c, _IO_FILE *fp) CHECK_FILE (fp, EOF); if (c == EOF) return EOF; + if (!_IO_need_lock (fp)) + return _IO_sputbackc (fp, (unsigned char) c); _IO_acquire_lock (fp); result = _IO_sputbackc (fp, (unsigned char) c); _IO_release_lock (fp); |