#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdlib.h>
#include <string.h>
int main()
{
key_t key = ftok("./", 1);
if (key < 0)
{
perror("ftok");
return -1;
}
printf("key = %#x\n", key);
//创建共享内存
int shmid = shmget(key, 64, IPC_CREAT | 0664);
if (shmid == -1)
{
perror("shmget");
return -1;
}
printf("shmid = %d\n", shmid);
//将共享内存映射到用户空间；
void *arg = shmat(shmid, NULL, 0);
if ((void *)-1 == arg)
{
perror("shmat");
return -1;
}
printf("arg = %p\n",arg);
int *pa = (int *)arg;
*pa = 0;
char *pb = (char *)(pa + 1);
strcpy(pb,"123456");
//打印
while (1)
{
if (0 == *pa)
{
printf("%s\n", pb);
}
*pa = 1;
}
return 0;
}
*///
#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <string.h>
int main()
{
key_t key = ftok("./", 1);
if (key < 0)
{
perror("ftok");
return -1;
}
printf("key = %#x\n", key);
//创建共享内存
int shmid = shmget(key, 64, IPC_CREAT | 0664);
if (shmid == -1)
{
perror("shmget");
return -1;
}
//将共享内存映射到用户空间；
void *arg = shmat(shmid, NULL, 0);
int *pa = (int *)arg;
char *pb = (char *)(pa + 1);
char *start, *end, temp;
//打印
while (1)
{
start = pb;
end = start + strlen(start) - 1;
if (1 == *pa)
{
while (start < end)
{
temp = *start;
*start = *end;
*end = temp;
start++;
end--;
}
}
*pa = 0;
}
return 0;
}