?? p11.9.c
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#include <stdio.h>#include <sys/ipc.h>#include <sys/shm.h>int main(void){ key_t key; int shmid; int proj_id; key=IPC_PRIVATE; shmid=shmget(key,1024,0660); if(shmid==-1) perror("cannot create a shared memory segment"); else printf("1. key=IPC_PRIVATE, shared memory segment shmid= %d\n",shmid); proj_id=1; key=ftok("/home/program",proj_id); if(key==-1) perror("cannot generate IPC key"); shmid=shmget(key,1024,IPC_CREAT|0660); if(shmid==-1) perror("cannot create a shared memory segment"); else printf("2. key=%d generated by ftok, shared memory shmid= %d\n",key,shmid); shmid=shmget(key,1024,IPC_CREAT |IPC_EXCL |0660); if(shmid==-1) perror("cannot create a shared memory segment"); shmid=shmget(key,1024,IPC_CREAT |0660); if(shmid==-1) perror("cannot create a shared memory segment"); else printf("Access the existing shared memory segment\n"); return 0;}
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