From d4522b8e9854178473adcea0fbb84f23f6e744bd Mon Sep 17 00:00:00 2001
From: Felipe Boeira <felipe.boeira@liu.se>
Date: Tue, 8 Jan 2019 18:39:03 +0100
Subject: Initial commit

---
 src/examples/mcp.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 src/examples/mcp.c

(limited to 'src/examples/mcp.c')

diff --git a/src/examples/mcp.c b/src/examples/mcp.c
new file mode 100644
index 0000000..6091dc8
--- /dev/null
+++ b/src/examples/mcp.c
@@ -0,0 +1,68 @@
+/* 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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