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authorRoland McGrath <roland@gnu.org>2002-08-15 23:57:00 +0000
committerRoland McGrath <roland@gnu.org>2002-08-15 23:57:00 +0000
commitfc77d66abf6ed97a50e30b619b1647759d43f593 (patch)
tree4eacd4d04abb104c54fe9ef2d05a65da6bafa315 /libio/tst-mmap-offend.c
parent8f83366e132bd7e273ea97c571e2d44c20a8ccbf (diff)
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* libio/fileops.c (_IO_file_seekoff_mmap): Leave read pointers at EOF
	if seek would go past it.
	(mmap_remap_check): If file position is at or past EOF after check,
	leave read pointers at EOF and don't seek.

	* libio/tst-mmap-offend.c: New file.
	* libio/Makefile (tests): Add it.
Diffstat (limited to 'libio/tst-mmap-offend.c')
-rw-r--r--libio/tst-mmap-offend.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/libio/tst-mmap-offend.c b/libio/tst-mmap-offend.c
new file mode 100644
index 0000000000..2025f1d2a8
--- /dev/null
+++ b/libio/tst-mmap-offend.c
@@ -0,0 +1,86 @@
+/* Test case for bug with mmap stdio read past end of file.  */
+
+#include <stdio.h>
+#include <error.h>
+#include <errno.h>
+
+static void do_prepare (void);
+#define PREPARE(argc, argv) do_prepare ()
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include <test-skeleton.c>
+
+static char *temp_file;
+
+static const char text1[] = "hello\n";
+
+static void
+do_prepare (void)
+{
+  int temp_fd = create_temp_file ("tst-mmap-offend.", &temp_file);
+  if (temp_fd == -1)
+    error (1, errno, "cannot create temporary file");
+  else
+    {
+      ssize_t cc = write (temp_fd, text1, sizeof text1 - 1);
+      if (cc != sizeof text1 - 1)
+	error (1, errno, "cannot write to temporary file");
+    }
+  close (temp_fd);
+}
+
+static int
+do_test (void)
+{
+  unsigned char buffer[8192];
+  int result = 0;
+  FILE *f = fopen (temp_file, "r");
+  size_t cc;
+
+  if (f == NULL)
+    {
+      perror (temp_file);
+      return 1;
+    }
+
+  cc = fread (buffer, 1, sizeof (buffer), f);
+  printf ("fread %zu: \"%.*s\"\n", cc, (int) cc, buffer);
+  if (cc != sizeof text1 - 1)
+    {
+      perror ("fread");
+      result = 1;
+    }
+
+  if (fseek (f, 2048, SEEK_SET) != 0)
+    {
+      perror ("fseek off end");
+      result = 1;
+    }
+
+  if (fread (buffer, 1, sizeof (buffer), f) != 0
+      || ferror (f) || !feof (f))
+    {
+      printf ("after fread error %d eof %d\n",
+	      ferror (f), feof (f));
+      result = 1;
+    }
+
+  printf ("ftell %ld\n", ftell (f));
+
+  if (fseek (f, 0, SEEK_SET) != 0)
+    {
+      perror ("fseek rewind");
+      result = 1;
+    }
+
+  cc = fread (buffer, 1, sizeof (buffer), f);
+  printf ("fread after rewind %zu: \"%.*s\"\n", cc, (int) cc, buffer);
+  if (cc != sizeof text1 - 1)
+    {
+      perror ("fread after rewind");
+      result = 1;
+    }
+
+  fclose (f);
+  return result;
+}