C program IPC message -


i using ipc 2 programs communication.

snippet of code sender:

int msgflg = ipc_creat | 0666;   key_t key_id;   struct msgbuf sbuf;   size_t buflen;   key_id = 1235;    sbuf.mtype = 1;    if (msgsnd(msqid, &sbuf, buflen, ipc_nowait) < 0)   {               die("msgsnd");    }   else {     mvprintw(8, 0, "%s", "                  ");     mvprintw(8, 0, "%s", sbuf.mtext);            }

receiving end:

if ((msqid = msgget(key_id, 0666)) < 0)      die("msgget()");         //break;  //receive answer of message type 1.    if (msgrcv(msqid, &rcvbuffer, maxsize, 1, 0) < 0)       die("msgrcv");   mvprintw(curr_row + 1, 0, "cleaning process monitor: %s", rcvbuffer.mtext);

the communication working perfect message received @ receiver's end not received.

if sending "hello" receives "h" buffer size 200

you can't declare struct msgbuf directly mtext size 1

struct msgbuf {     long mtype;       /* message type, must > 0 */     char mtext[1];    /* message data */  };

what need declare long char array in structure, , convert void*

for example,

struct msgbuf {     long type;     char mtext[200]; };  struct msgbuf mybuf; // set type, store data in mtext  msgsnd(msqid, (void*)&mybuf, sizeof(msgbuf)+1, ipc_nowait)

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