1 /** |
|
2 * @file MsgQCreate.cpp |
|
3 * Description: Source file for MsgQLib's MsgQCreate API |
|
4 * Copyright (c) 2007 Nokia Corporation. |
|
5 * All rights reserved. |
|
6 * Redistribution and use in source and binary forms, with or without modification, |
|
7 * are permitted provided that the following conditions are met: |
|
8 * Redistributions of source code must retain the above copyright notice, this list |
|
9 * of conditions and the following disclaimer.Redistributions in binary form must |
|
10 * reproduce the above copyright notice, this list of conditions and the following |
|
11 * disclaimer in the documentation and/or other materials provided with the distribution. |
|
12 * Neither the name of the Nokia Corporation nor the names of its contributors may be used |
|
13 * to endorse or promote products derived from this software without specific prior written |
|
14 * permission. |
|
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY |
|
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
|
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
|
18 * SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
|
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
|
20 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
|
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
|
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
|
23 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
|
24 */ |
|
25 |
|
26 #include <errno.h> |
|
27 #include <sys/msg.h> |
|
28 #include <sys/sem.h> |
|
29 #include <MsgQInternal.h> |
|
30 |
|
31 |
|
32 /******************************************************************************** |
|
33 * MsgQCreate |
|
34 * Description: Creates a message queue |
|
35 * Inputs: |
|
36 * qName : ULONG that represents the queue name |
|
37 * maxMsgs : ULONG that represents maximum size of messages |
|
38 *********************************************************************************/ |
|
39 EXPORT_C int MsgQCreate(ULONG qName, ULONG maxMsgs, ULONG qOptions, int* err) { |
|
40 int qId; |
|
41 //int semId; |
|
42 //int semName ; |
|
43 struct msqid_ds qStatus ; |
|
44 //struct semid_ds sStatus ; |
|
45 |
|
46 //union semun { |
|
47 // int val; |
|
48 // struct semid_ds* buf; |
|
49 // ushort_t* array; |
|
50 //} arg ; |
|
51 |
|
52 int hashInstErr; |
|
53 |
|
54 //if (MsgQTableLookup(qName) != NULL) { |
|
55 // *err = OK; |
|
56 // return (OK); |
|
57 //} |
|
58 //else { |
|
59 if((qOptions == MSG_Q_FIFO) || (qOptions == MSG_Q_PRIORITY)) { |
|
60 // Set msg queue options to FIFO and create the message queue |
|
61 qOptions= MSG_Q_FIFO ; |
|
62 |
|
63 if((qId = msgget((key_t) qName ,IPC_CREAT | 0666 | IPC_EXCL )) >=0 ) { |
|
64 // set msg queue parameter max # bytes in queue |
|
65 |
|
66 if( msgctl(qId,IPC_STAT,&qStatus) == 0 ) |
|
67 |
|
68 if( qStatus.msg_qbytes > (maxMsgs * MAX_MSG_LEN) ) { |
|
69 qStatus.msg_qbytes = maxMsgs * MAX_MSG_LEN ; |
|
70 if( msgctl(qId,IPC_SET,&qStatus) < 0) { |
|
71 // delete message queue on error |
|
72 msgctl(qId,IPC_RMID,0); |
|
73 *err = errno; |
|
74 return(ERROR); |
|
75 } |
|
76 } |
|
77 *err = OK; |
|
78 return (OK); |
|
79 |
|
80 // create semaphore |
|
81 //semName= (key_t) qName; |
|
82 //if((semId = semget(semName, 1, IPC_CREAT | 0666 |IPC_EXCL )) >= 0 ) { |
|
83 // set the semaphore value |
|
84 // arg.buf = &sStatus; |
|
85 // arg.val = 1; |
|
86 // semctl(semId , 0, SETVAL, arg) ; |
|
87 |
|
88 //install queue data in hash table |
|
89 // if(InstallMsqQTable(qName, qId, semId, &hashInstErr) == OK) { |
|
90 // AddToMsgQTable(qName); |
|
91 // *err = OK; |
|
92 // return (OK); |
|
93 // } |
|
94 // else { |
|
95 //delete semaphore on error |
|
96 // semctl(semId,0,IPC_RMID,0) ; |
|
97 // *err = hashInstErr; |
|
98 // } |
|
99 //} |
|
100 //else { |
|
101 // delete message queue on error |
|
102 // msgctl(qId,IPC_RMID,0); |
|
103 // *err = errno; |
|
104 //} |
|
105 } |
|
106 else { |
|
107 *err = errno; |
|
108 } |
|
109 } |
|
110 else |
|
111 *err = KMsgQLibParamErr; |
|
112 |
|
113 return(ERROR); |
|
114 //} |
|
115 } |
|
116 |
|