#include <errno.h>#include <string.h>#include <sys/ipc.h>#include <sys/sem.h>#include <sys/stat.h>#include <sys/types.h>#include "log.h"#include "rl.h"#include "sem.h"
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Macros | |
| #define | _GNU_SOURCE |
Functions | |
| int | sem_create (key_t key, int count) |
| int | sem_remove (int id) |
| int | sem_open (key_t key, int count) |
| int | sem_wait (int id, int index, int timeout) |
| int | sem_set (int id, int index, int value) |
| int | sem_get (int id, int index) |
Macro Definition Documentation
◆ _GNU_SOURCE
| #define _GNU_SOURCE |
Copyright (c) 2016-2020, ETH Zurich, Computer Engineering Group 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.
Function Documentation
◆ sem_create()
| int sem_create | ( | key_t | key, |
| int | count | ||
| ) |
Create RocketLogger semaphore set.
- Parameters
-
key The key identifying the semaphore set to create count The number of semaphores in the set to create
- Returns
- ID of created set on success, negative on failure with errno set accordingly
Definition at line 49 of file sem.c.
References rl_log(), and RL_LOG_ERROR.
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◆ sem_get()
| int sem_get | ( | int | id, |
| int | index | ||
| ) |
Get value of a semaphore.
- Parameters
-
id ID of semaphore set index Index of semaphore in set
- Returns
- The semaphore count, or negative on failure with errno set accordingly
Definition at line 129 of file sem.c.
References rl_log(), and RL_LOG_ERROR.
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◆ sem_open()
| int sem_open | ( | key_t | key, |
| int | count | ||
| ) |
Open existing RocketLogger semaphore set.
- Parameters
-
key The key identifying the semaphore set count The number of semaphores in the set
- Returns
- ID of opened set, negative on failure with errno set accordingly
Definition at line 68 of file sem.c.
References rl_log(), and RL_LOG_ERROR.
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◆ sem_remove()
| int sem_remove | ( | int | id | ) |
Remove semaphore set.
- Parameters
-
id ID of set to remove
- Returns
- Returns 0 on success, negative on failure with errno set accordingly
Definition at line 58 of file sem.c.
References rl_log(), RL_LOG_ERROR, and SUCCESS.
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◆ sem_set()
| int sem_set | ( | int | id, |
| int | index, | ||
| int | value | ||
| ) |
Set value to semaphore.
- Parameters
-
id ID of semaphore set index Index of semaphore in set value Value to be set to semaphore
- Returns
- Returns 0 on success, negative on failure with errno set accordingly
Definition at line 108 of file sem.c.
References rl_log(), RL_LOG_ERROR, SEM_OPT_NO_FLAG, SEM_TIMEOUT_WRITE, and SUCCESS.
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◆ sem_wait()
| int sem_wait | ( | int | id, |
| int | index, | ||
| int | timeout | ||
| ) |
Wait on a semaphore until access granted.
- Parameters
-
id ID of semaphore set index Index of semaphore in set timeout Maximum waiting time before failing in seconds
- Returns
- Returns 0 on success, negative on failure with errno set accordingly
Definition at line 78 of file sem.c.
References rl_log(), RL_LOG_ERROR, SEM_OPT_NO_FLAG, and SUCCESS.
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