/usr/include/x86_64-linux-gnu/sys/sem.h is in libc6-dev 2.23-0ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | /* Copyright (C) 1995-2016 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
<http://www.gnu.org/licenses/>. */
#ifndef _SYS_SEM_H
#define _SYS_SEM_H 1
#include <features.h>
#define __need_size_t
#include <stddef.h>
/* Get common definition of System V style IPC. */
#include <sys/ipc.h>
/* Get system dependent definition of `struct semid_ds' and more. */
#include <bits/sem.h>
#ifdef __USE_GNU
# define __need_timespec
# include <time.h>
#endif
/* The following System V style IPC functions implement a semaphore
handling. The definition is found in XPG2. */
/* Structure used for argument to `semop' to describe operations. */
struct sembuf
{
unsigned short int sem_num; /* semaphore number */
short int sem_op; /* semaphore operation */
short int sem_flg; /* operation flag */
};
__BEGIN_DECLS
/* Semaphore control operation. */
extern int semctl (int __semid, int __semnum, int __cmd, ...) __THROW;
/* Get semaphore. */
extern int semget (key_t __key, int __nsems, int __semflg) __THROW;
/* Operate on semaphore. */
extern int semop (int __semid, struct sembuf *__sops, size_t __nsops) __THROW;
#ifdef __USE_GNU
/* Operate on semaphore with timeout. */
extern int semtimedop (int __semid, struct sembuf *__sops, size_t __nsops,
const struct timespec *__timeout) __THROW;
#endif
__END_DECLS
#endif /* sys/sem.h */
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