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#include<stdio.h> #include<stdlib.h> #include<sys/ipc.h> #include<sys/msg.h> #include<sys/types.h> #define SIZE 40 void main() { int mfd, mfd2, mfd3; struct { long mtype; char mtext[6]; } s1, s2, s3; if ((mfd = msgget(1000, 0)) == -1) { perror("msg_get"); exit(1); } if (msgrcv(mfd, &s1, SIZE, 0, IPC_NOWAIT | MSG_NOERROR) == -1) { perror("msg_rcv"); exit(1); } printf("Message from client is :%s\n", s1.mtext); if ((mfd2 = msgget(1000, 0)) == -1) { perror("msg_get"); exit(1); } if (msgrcv(mfd2, &s2, SIZE, 0, IPC_NOWAIT | MSG_NOERROR) == -1) { perror("msg_rcv"); exit(1); } printf("Message from client is :%s\n", s2.mtext); if ((mfd3 = msgget(1000, 0)) == -1) { perror("msgget"); exit(1); } if (msgrcv(mfd3, &s3, SIZE, 0, IPC_NOWAIT | MSG_NOERROR) == -1) { perror("msg_rcv"); exit(1); } printf("Message from sender is :%s\n", s3.mtext); return; }
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