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/* mcp.c
Copies one file to another, using mmap. */
#include <stdio.h>
#include <string.h>
#include <syscall.h>
int
main (int argc, char *argv[])
{
int in_fd, out_fd;
mapid_t in_map, out_map;
void *in_data = (void *) 0x10000000;
void *out_data = (void *) 0x20000000;
int size;
if (argc != 3)
{
printf ("usage: cp OLD NEW\n");
return EXIT_FAILURE;
}
/* Open input file. */
in_fd = open (argv[1]);
if (in_fd < 0)
{
printf ("%s: open failed\n", argv[1]);
return EXIT_FAILURE;
}
size = filesize (in_fd);
/* Create and open output file. */
if (!create (argv[2], size))
{
printf ("%s: create failed\n", argv[2]);
return EXIT_FAILURE;
}
out_fd = open (argv[2]);
if (out_fd < 0)
{
printf ("%s: open failed\n", argv[2]);
return EXIT_FAILURE;
}
/* Map files. */
in_map = mmap (in_fd, in_data);
if (in_map == MAP_FAILED)
{
printf ("%s: mmap failed\n", argv[1]);
return EXIT_FAILURE;
}
out_map = mmap (out_fd, out_data);
if (out_map == MAP_FAILED)
{
printf ("%s: mmap failed\n", argv[2]);
return EXIT_FAILURE;
}
/* Copy files. */
memcpy (out_data, in_data, size);
/* Unmap files (optional). */
munmap (in_map);
munmap (out_map);
return EXIT_SUCCESS;
}
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