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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)
downloadglibc-fc77d66abf6ed97a50e30b619b1647759d43f593.tar.gz
* 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;
+}