内存共享基本演示

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/shm.h>

#define BUFSIZ 102400
int main()
{
int shmid=-1;
char * viraddr;
char buffer[BUFSIZ];
key_t shmkey =ftok("/home/cip/test/", 0);
shmid = shmget(shmkey,BUFSIZ, IPC_CREAT|0666); //申请共享区域
viraddr=(char*)shmat(shmid,0,0); //附件共享地址到将本进程
while(1)
{
puts("enter some text:");
fgets(buffer, BUFSIZ, stdin);
strcat(viraddr,buffer);添加数据到共享内存中
if(strncmp(buffer,"end",3)==0)
{
break;
}
}
shmdt(viraddr); //撤销地址映射

return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/shm.h>

#define BUFSIZ 102400
int main()
{
int shmid=-1;
char * viraddr;
char buffer[BUFSIZ];
key_t shmkey = ftok("/home/cip/test/", 0);

shmid = shmget(shmkey,BUFSIZ, IPC_CREAT|0666); //获取共享区域
viraddr=(char*)shmat(shmid,0,0);
printf("Your message is:\n%s", viraddr);
shmdt(viraddr);
shmctl(shmid, IPC_RMID,0);

return 0;
}