795884dbf1
the definition of MSG_NOERROR and IPC_NOWAIT should not be aligned
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MSGOP(2)
NAME
msgrcv, msgsnd - System V message queue operations
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EXAMPLE
The program below demonstrates the use of msgsnd() and msgrcv().
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if (msgrcv(qid, (void *) &msg, sizeof(msg.mtext), msgtype,
MSG_NOERROR | IPC_NOWAIT) == -1) {
...
Signed-off-by: chao.an <anchao@xiaomi.com>
99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/****************************************************************************
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* include/sys/ipc.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_SYS_IPC_H
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#define __INCLUDE_SYS_IPC_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Mode bits: The lower order 9-bit bits are the standard mode bits */
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#define IPC_MODE 0x01ff /* Mode bit mask */
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#define IPC_CREAT 0x0200 /* Create key if key does not exist. */
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#define IPC_EXCL 0x0400 /* Fail if key exists. */
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#define IPC_NOWAIT 0x0800 /* Return error on wait. */
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/* Keys: */
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#define IPC_PRIVATE 0 /* Private key */
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/* Control commands: */
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#define IPC_RMID 0 /* Remove identifier */
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#define IPC_SET 1 /* Set options */
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#define IPC_STAT 2 /* Get options */
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/* The ipc_perm structure is used by three mechanisms for XSI interprocess
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* communication (IPC): messages, semaphores, and shared memory. All use a
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* common structure type, ipc_perm, to pass information used in determining
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* permission to perform an IPC operation.
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*/
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struct ipc_perm
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{
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#if 0 /* User and group IDs not yet supported by NuttX */
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uid_t uid; /* Owner's user ID */
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gid_t gid; /* Owner's group ID */
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uid_t cuid; /* Creator's user ID */
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gid_t cgid; /* Creator's group ID */
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#endif
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mode_t mode; /* Read/write permission */
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};
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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key_t ftok(FAR const char *path, int id);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __INCLUDE_SYS_IPC_H */
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