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？

问题描述：

如题，最好提供函数或代码，感谢！

答

#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

答

共享内存实现

https://blog.csdn.net/adgentleman/article/details/106792009

答

server.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
char buf[10];
char *ptr;
int main()
{
int fd;
fd = shm_open( "region" , O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
if (fd<0) {
printf ( "error open region\n" );
return 0;
}
ftruncate(fd, 90);
char *ptr = mmap(NULL, 10, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
printf ( "error map\n" );
return 0;
}
ptr = "dcba";
return 0;
}

client.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/stat.h>
char buf[10];
char *ptr;
int main()
{
int fd;
fd = shm_open( "region" , O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
if (fd<0) {
printf ( "error open region\n" );
return 0;
}
ftruncate(fd, 90);
char* ptr = mmap(NULL, 10, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (ptr == MAP_FAILED) {
printf ( "error map\n" );
return 0;
}
printf ("ptr : %s\n" , ptr);
return 0;
}

请问我的code问题在哪

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？

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