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Revision 1.5, Sun Apr 24 19:48:29 2016 UTC (2 years, 10 months ago) by dholland
Branch: MAIN
CVS Tags: prg-localcount2-base3, prg-localcount2-base2, prg-localcount2-base1, prg-localcount2-base, prg-localcount2, phil-wifi-base, phil-wifi, pgoyette-localcount-base, pgoyette-localcount-20170426, pgoyette-localcount-20170320, pgoyette-localcount-20170107, pgoyette-localcount-20161104, pgoyette-localcount-20160806, pgoyette-localcount-20160726, pgoyette-localcount, pgoyette-compat-merge-20190127, pgoyette-compat-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, pgoyette-compat-0521, pgoyette-compat-0502, pgoyette-compat-0422, pgoyette-compat-0415, pgoyette-compat-0407, pgoyette-compat-0330, pgoyette-compat-0322, pgoyette-compat-0315, pgoyette-compat, perseant-stdc-iso10646-base, perseant-stdc-iso10646, netbsd-8-base, netbsd-8-0-RELEASE, netbsd-8-0-RC2, netbsd-8-0-RC1, netbsd-8, matt-nb8-mediatek-base, matt-nb8-mediatek, localcount-20160914, bouyer-socketcan-base1, bouyer-socketcan-base, bouyer-socketcan, HEAD
Changes since 1.4: +2 -2 lines

Define SEM_VALUE_MAX in only one place.

Adding a whole extra header file just for this is not the optimal
solution... but stuffing it in with anything else exposes things that
otherwise wouldn't be.

Nothing in userland should use <sys/semaphore.h> directly, and if some
foolish third-party software should decide to do so anyway in spite of
the instructions to the contrary I will ruthlessly break it later when
the big kernel includes cleanup finally happens.

Reported by Kamil Rytarowski, and, as it turns out, also by Klaus
Heinz in 2008.

/* $NetBSD: semaphore.h,v 1.5 2016/04/24 19:48:29 dholland Exp $ */

/*-
 * Copyright (c) 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _SEMAPHORE_H_
#define _SEMAPHORE_H_

/* POSIX 1003.1b semaphores */

struct _sem_st;
typedef	struct _sem_st *sem_t;

#define	SEM_FAILED	((sem_t *)0)

#include <sys/semaphore.h> /* some kernel-only bits */
#include <sys/time.h>

__BEGIN_DECLS
int	 sem_close(sem_t *);
int	 sem_destroy(sem_t *);
int	 sem_getvalue(sem_t * __restrict, int * __restrict);
int	 sem_init(sem_t *, int, unsigned int);
int	 sem_post(sem_t *);
int	 sem_timedwait(sem_t *, const struct timespec * __restrict);
int	 sem_trywait(sem_t *);
int	 sem_unlink(const char *);
int	 sem_wait(sem_t *);
sem_t	*sem_open(const char *, int, ...);
__END_DECLS

#endif /* !_SEMAPHORE_H_ */