?? p11.2.c
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#include <stdio.h>#include <sys/types.h>#include <sys/ipc.h>#include <sys/msg.h>int main(void){ key_t key; int msqid; int proj_id; key=IPC_PRIVATE; msqid=msgget(key,0777); if(msqid==-1) perror("cannot create message queue"); else printf("1. key=IPC_PRIVATE, message queue msqid= %d\n",msqid); proj_id=1; key=ftok("/home/program",proj_id); if(key==-1) perror("cannot generate messge queue key"); msqid=msgget(key,IPC_CREAT|0777); if(msqid==-1) perror("cannot create message queue"); else printf("2. key=%d generated by ftok, message queue msqid= %d\n",key,msqid); msqid=msgget(key,IPC_CREAT |IPC_EXCL |0777); if(msqid==-1) perror("cannot create message queue"); msqid=msgget(key,IPC_CREAT |0777); if(msqid==-1) perror("cannot create message queue"); else printf("Access the existing message queue\n"); return 0;}
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