File indexing completed on 2025-08-03 08:20:46
0001
0002 #include <msgqueue.h>
0003
0004 msgqueue::msgqueue ( char * token, const int id,
0005 int &status, const int inew )
0006 {
0007
0008 int ishmflg;
0009
0010 tokenid = ftok ( token, id);
0011 wasnew = inew;
0012 if (inew)
0013 {
0014 ishmflg = 0666 | IPC_CREAT;
0015 }
0016 else
0017 {
0018 ishmflg = 0666;
0019 }
0020 msgid = msgget(tokenid,ishmflg);
0021
0022 if (msgid < 0)
0023 {
0024 status = msgid;
0025 return;
0026 }
0027
0028 status = 0;
0029 }
0030
0031 msgqueue::~msgqueue()
0032 {
0033 if (wasnew)
0034 {
0035
0036 #if defined(SunOS) || defined(Linux)
0037 struct msqid_ds msgb;
0038 msgctl (msgid, IPC_RMID,&msgb);
0039
0040 #else
0041 msgctl (msgid, IPC_RMID);
0042
0043 #endif
0044
0045 }
0046 }
0047
0048 int msgqueue::receive( struct msgbuf *structure, int size)
0049 {
0050 return msgrcv(msgid, structure, size, 0, 0);
0051 }
0052
0053 int msgqueue::receive_nowait( struct msgbuf* structure, int size)
0054 {
0055 return msgrcv(msgid, structure, size, 0, IPC_NOWAIT);
0056 }
0057
0058 int msgqueue::send( struct msgbuf * structure, int size)
0059 {
0060 return msgsnd(msgid, structure, size, 0);
0061 }
0062
0063 int msgqueue::wait_for_ping()
0064 {
0065 int i[2];
0066 return msgrcv(msgid, (struct msgbuf *) i, 8, 0, 0);
0067 }
0068
0069 int msgqueue::send_ping()
0070 {
0071 int i[2];
0072 i[0]= 1;
0073 i[1]= 0;
0074
0075 return msgsnd(msgid, (struct msgbuf *) i , 8, 0);
0076 }
0077
0078
0079
0080
0081
0082
