71 lines
1.1 KiB
C
71 lines
1.1 KiB
C
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <assert.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <sys/mman.h>
|
||
|
|
|
||
|
|
|
||
|
|
#define BUFSIZE 1024
|
||
|
|
|
||
|
|
|
||
|
|
static inline double tstamp(void)
|
||
|
|
{
|
||
|
|
struct timespec tv;
|
||
|
|
clock_gettime(CLOCK_REALTIME, &tv);
|
||
|
|
return tv.tv_sec + tv.tv_nsec * 1.0e-9;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
//char buf[BUFSIZE];
|
||
|
|
char * bufin = NULL,
|
||
|
|
* bufout = NULL;
|
||
|
|
|
||
|
|
|
||
|
|
int fin,
|
||
|
|
fout;
|
||
|
|
|
||
|
|
double start,
|
||
|
|
end;
|
||
|
|
|
||
|
|
size_t filesize = 0;
|
||
|
|
|
||
|
|
assert(argc == 3);
|
||
|
|
|
||
|
|
start = tstamp();
|
||
|
|
|
||
|
|
fin = open(argv[1],O_RDONLY);
|
||
|
|
assert(fin >=0);
|
||
|
|
|
||
|
|
fout = open(argv[2],O_RDWR|O_CREAT|O_TRUNC,0600);
|
||
|
|
assert(fout >=0);
|
||
|
|
|
||
|
|
filesize = lseek(fin,0,SEEK_END);
|
||
|
|
ftruncate (fout,filesize);
|
||
|
|
|
||
|
|
bufin = mmap(NULL,filesize,PROT_READ,MAP_PRIVATE,fin,0);
|
||
|
|
assert(bufin != (void*)-1);
|
||
|
|
|
||
|
|
bufout = mmap(NULL,filesize,PROT_WRITE,MAP_SHARED,fout,0);
|
||
|
|
|
||
|
|
assert(bufout != (void*)-1);
|
||
|
|
|
||
|
|
|
||
|
|
memcpy(bufout,bufin,filesize);
|
||
|
|
|
||
|
|
//munmap(bufin,filesize);
|
||
|
|
//munmap(bufout,filesize);
|
||
|
|
|
||
|
|
//ssize_t nb_read = read(fin,buf,sizeof(buf));
|
||
|
|
close(fin);
|
||
|
|
close(fout);
|
||
|
|
|
||
|
|
end = tstamp();
|
||
|
|
|
||
|
|
printf("time = %.3lf\n",end - start);
|
||
|
|
return 0;
|
||
|
|
}
|