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  1. #include <sys/mman.h>
  2. #include <fcntl.h> 
  3. #include <unistd.h>
  4. #include <string.h>
  5.  
  6. int main(int argc, char **argv) { 
  7.     int sfd, dfd;
  8.     char *src, *dest; 
  9.     size_t filesize;
  10.  
  11.     /* ORIGEN */
  12.     sfd = open(argv[1], O_RDONLY);
  13.     filesize = lseek(sfd, 0, SEEK_END);
  14.     src = mmap(NULL, filesize, PROT_READ, MAP_PRIVATE, sfd, 0);
  15.  
  16.     /* DESTINO */
  17.     dfd = open(argv[2], O_RDWR | O_CREAT, 0666);
  18.     ftruncate(dfd, filesize);
  19.     dest = mmap(NULL, filesize, PROT_READ|PROT_WRITE, MAP_SHARED, dfd, 0);
  20.  
  21.     /* COPIA */
  22.     memcpy(dest, src, filesize);
  23.     munmap(src, filesize);
  24.     munmap(dest, filesize);
  25.     close(sfd);
  26.     close(dfd);
  27.  
  28.     return 0;
  29. }
Success #stdin #stdout 0s 5296KB
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https://ideone.com/nJ0wzo
language:
C (gcc 8.3)
created:
32 days ago
visibility:
public

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