Linux下共享内存通信演示（C程序）

#include <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/ipc.h> #include <sys/shm.h> #include <sys/msg.h> #define BUFSIZE 2048 #define SHMFLG 0777 #define MSGKEY 4152 struct msgform { int mtype; int mtext; }msg1; int main() { int shmid,msgid1; char *shmadd; struct shmid_ds buff; msgid1 = msgget(MSGKEY,0666|IPC_CREAT); /*Creat a shared-memory*/ if((shmid = shmget(IPC_PRIVATE,BUFSIZE,SHMFLG|IPC_CREAT)) < 0) { perror("shmget"); exit(1); } while(1) { msg1.mtype = 1; msg1.mtext = shmid; // msgsnd(msgid1,&msg1,128,0); /*Attached shared-memory*/ if((shmadd = shmat(shmid,0,0)) < (char *)0){ perror("shmat"); exit(1); } shmctl(shmid,IPC_STAT,&buff); printf("Please input your message: "); fgets(shmadd,256,stdin); printf("\n"); msgsnd(msgid1,&msg1,128,0); if(!strncasecmp(shmadd,"quit",4)) break; } /*Deleted shared-momory*/ if((shmdt(shmadd)) < 0){ perror("shmdt"); exit(1); } shmctl(shmid,IPC_RMID,0); msgctl(msgid1,IPC_RMID,0); exit(0); }