1 files changed, 96 insertions, 0 deletions
diff --git a/winsup/testsuite/winsup.api/mmaptest04.c b/winsup/testsuite/winsup.api/mmaptest04.c
new file mode 100644
index 000000000..e8cc0a61f
--- /dev/null
+++ b/winsup/testsuite/winsup.api/mmaptest04.c
@@ -0,0 +1,96 @@
+#include <sys/types.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <errno.h>
+
+int
+main ()
+{
+  char *data, *data2, *data3;
+  int i, pagesize;
+  int fd;
+
+  pagesize = 65536;		//getpagesize();
+
+  /*
+   * First, make a file with some known garbage in it.
+   */
+  data = (char *) malloc (pagesize);
+  if (!data)
+    exit (1);
+  for (i = 0; i < pagesize; ++i)
+    *(data + i) = rand ();
+  umask (0);
+  fd = creat ("conftestmmap", 0600);
+  if (fd < 0)
+    {
+      printf ("creat: %d\n", errno);
+      exit (1);
+    }
+  if (write (fd, data, pagesize) != pagesize)
+    {
+      printf ("write: %d\n", errno);
+      exit (1);
+    }
+  close (fd);
+
+  /*
+   * Next, try to mmap the file.
+   */
+  fd = open ("conftestmmap", O_RDWR);
+  if (fd < 0)
+    {
+      printf ("write: %d\n", errno);
+      exit (1);
+    }
+  if ((data2 = mmap (data2, pagesize, PROT_READ | PROT_WRITE,
+		     MAP_PRIVATE, fd, 0L)) == MAP_FAILED)
+    {
+      printf ("mmap: %d\n", errno);
+      exit (1);
+    }
+  for (i = 0; i < pagesize; ++i)
+    if (*(data + i) != *(data2 + i))
+      {
+	printf ("check-if: %d\n", errno);
+	exit (1);
+      }
+
+  /*
+   * Finally, make sure that changes to the mapped area
+   * do not percolate back to the file as seen by read().
+   * (This is a bug on some variants of i386 svr4.0.)
+   */
+  for (i = 0; i < pagesize; ++i)
+    *(data2 + i) = *(data2 + i) + 1;
+  data3 = (char *) malloc (pagesize);
+  if (!data3)
+    {
+      printf ("malloc2: %d\n", errno);
+      exit (1);
+    }
+  if (read (fd, data3, pagesize) != pagesize)
+    {
+      printf ("read: %d\n", errno);
+      exit (1);
+    }
+  for (i = 0; i < pagesize; ++i)
+    if (*(data + i) != *(data3 + i))
+      {
+	printf ("check-if2: %d\n", errno);
+	exit (1);
+      }
+  if (msync (data2, pagesize, MS_SYNC))
+    {
+      printf ("msync: %d\n", errno);
+      exit (1);
+    }
+  if (munmap (data2, pagesize))
+    {
+      printf ("munmap: %d\n", errno);
+      exit (1);
+    }
+  close (fd);
+  unlink ("conftestmmap");
+  exit (0);
+}