smart memcpy

[Michael Trimarchi <trimarchi at gandalf dot sssup dot it>]

Hi all,
is it the only solution for a smart memcpy?


#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/mman.h>
#include <unistd.h>
#include <malloc.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>           /* For O_* constants */


int main (int argc, char **argv)
{
        char *s,*x;
        int i;
        int fd;
    int addr;
    int size=40960;
       
   
//s=mmap(NULL,size,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS,-1,0);
        fd=shm_open("memcpy",O_RDWR|O_CREAT,0600);
        ftruncate(fd,size);
        printf("s = %p\n",s);
        s = mmap(0,size,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
        memset(s, 'X', size);
       
        x = mmap(0,size,PROT_READ|PROT_WRITE,MAP_PRIVATE,fd,0);
    
    if ((int)(x)!=-1) {
           printf("x = %p\n",x);
       *x='P';
           for (i=0;i<40; i++)
       printf("sval=%c;xval=%c;",*(x+i),*(s+i));     
    } else {
        printf("%s %d %x\n",strerror(errno),errno,x);


    }
    
        return 0;

}