sem.c File Reference

#include <fcntl.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/types.h>
#include "sem.h"

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Macros
#define	_GNU_SOURCE

Functions
int	create_sem (key_t key, int num_sems)
int	remove_sem (int sem_id)
int	open_sem (key_t key, int num_sems)
int	wait_sem (int sem_id, int sem_num, int time_out)
int	set_sem (int sem_id, int sem_num, int val)

Macro Definition Documentation

#define _GNU_SOURCE

Copyright (c) 2016-2018, Swiss Federal Institute of Technology (ETH Zurich) All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• 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.
• Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.

Definition at line 32 of file sem.c.

Function Documentation

int create_sem	(	key_t	key,
		int	num_sems
	)

Create RocketLogger semaphore set

Returns

ID of created set

Definition at line 46 of file sem.c.

References ERROR, rl_log(), and sem_id.

Referenced by pru_sample().

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int open_sem	(	key_t	key,
		int	num_sems
	)

Open existing RocketLogger semaphore set

Returns

ID of opened set

Definition at line 72 of file sem.c.

References ERROR, rl_log(), and sem_id.

Referenced by main().

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int remove_sem

(

int

sem_id

)

Remove semaphore set

Parameters

sem_id

ID of set to remove

Returns

SUCCESS on success, FAILURE otherwise

Definition at line 59 of file sem.c.

References ERROR, FAILURE, rl_log(), and SUCCESS.

Referenced by pru_sample().

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int set_sem	(	int	sem_id,
		int	sem_num,
		int	val
	)

Set value to semaphore

Parameters

sem_id	ID of semaphore set
sem_num	Number of semaphore in set
val	Value to be set to semaphore

Returns

SUCCESS on success (access granted), TIME_OUT on time out, FAILURE otherwise

Definition at line 124 of file sem.c.

References ERROR, FAILURE, NO_FLAG, rl_log(), SEM_SET_TIME_OUT, SUCCESS, and TIME_OUT.

Referenced by main(), print_data(), pru_sample(), and web_handle_data().

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int wait_sem	(	int	sem_id,
		int	sem_num,
		int	time_out
	)

Wait on a semaphore until access granted

Parameters

sem_id	ID of semaphore set
sem_num	Number of semaphore in set
time_out	Maximum waiting time

Returns

SUCCESS on success (access granted), TIME_OUT on time out, FAILURE otherwise

Definition at line 88 of file sem.c.

References ERROR, FAILURE, INFO, NO_FLAG, rl_log(), SUCCESS, TIME_OUT, and WARNING.

Referenced by main(), print_data(), and web_handle_data().

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