代码：
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
typedef struct{
char name[4];
int age;
}people;
int main(int argc, char *argv[])
{
int shm_id,i;
key_t key;
char temp;
people *p_map;
char *path = "/home/program/mmapfile.cc";
key = ftok(path,0);
if(key == -1)
{
perror("ftok error \n");
return -1;
}
shm_id = shmget(key,4096,IPC_CREAT);
if(shm_id == -1)
{
perror("shmget error \n");
return -1;
}
p_map = (people*)shmat(shm_id,NULL,0);
temp = 'a';
for(i = 0; i < 10; i++)
{
temp +=1;
memcpy((*(p_map+i)).name,&temp,1);
(*(p_map+i)).age = 20+i;
}
system("ipcs -m");
if(shmdt(p_map) == -1)
{
perror("detach error");
}
system("ipcs -m");
}
GDB调试：
GNU gdb (GDB) 7.0-ubuntu
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
