C语言如何实现一个进程将字符串写入某地址，另一个进程读取该地址获取字符串？

Question

如题，最好提供函数或代码，感谢！

Answer 1

#include <stdio.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#define POS ((void*)0x7ffff7dff000)
int main()
{
    int fd ,ret ,*pos;
    if( -1 == (fd = shm_open("/test",O_RDWR|O_CREAT,0777)))
    {
        return 0;
    }
    if(-1 == ftruncate(fd,1024))
        return 0;

    if(MAP_FAILED == (pos = mmap(POS,1024,PROT_READ|PROT_WRITE,MAP_SHARED|MAP_FIXED,fd,0)))
    {
        return 0;
    }
    printf("%d\n",*pos);
    *pos = 4;
    printf("%d\n",*pos);
    while(1);
    return 0;
}

编译 gcc file.c -lrt