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-rw-r--r--sysdeps/pthread/sem_routines.h27
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diff --git a/sysdeps/pthread/sem_routines.h b/sysdeps/pthread/sem_routines.h
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+/* Helper code for POSIX semaphore implementation.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SEM_ROUTINES_H
+#define _SEM_ROUTINES_H
+
+sem_t * __sem_check_add_mapping (const char *name, int fd, sem_t *existing)
+  attribute_hidden;
+
+bool __sem_remove_mapping (sem_t *sem) attribute_hidden;
+
+#endif