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