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-rw-r--r--winsup/cygwin/include/sys/stdio.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/winsup/cygwin/include/sys/stdio.h b/winsup/cygwin/include/sys/stdio.h
index 04d8ffcaf..686ad534f 100644
--- a/winsup/cygwin/include/sys/stdio.h
+++ b/winsup/cygwin/include/sys/stdio.h
@@ -17,6 +17,9 @@ details. */
# if !defined(_flockfile)
# define _flockfile(fp) __cygwin_lock_lock ((_LOCK_T *)&(fp)->_lock)
# endif
+# if !defined(_ftrylockfile)
+# define _ftrylockfile(fp) __cygwin_lock_trylock ((_LOCK_T *)&(fp)->_lock)
+# endif
# if !defined(_funlockfile)
# define _funlockfile(fp) __cygwin_lock_unlock ((_LOCK_T *)&(fp)->_lock)
# endif