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-rw-r--r--libc/libio/tst-mmap2-eofsync.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/libc/libio/tst-mmap2-eofsync.c b/libc/libio/tst-mmap2-eofsync.c
new file mode 100644
index 000000000..f3699656a
--- /dev/null
+++ b/libc/libio/tst-mmap2-eofsync.c
@@ -0,0 +1,137 @@
+/* Test program for synchronization of stdio state with file after EOF. */
+
+#include <stdio.h>
+#include <error.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.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 int temp_fd;
+
+static char *pages;
+
+static void
+do_prepare (void)
+{
+ pages = malloc (getpagesize () * 2);
+ memset (pages, 'a', getpagesize ());
+ memset (pages + getpagesize (), 'b', getpagesize ());
+
+ temp_fd = create_temp_file ("tst-mmap2-eofsync.", &temp_file);
+ if (temp_fd == -1)
+ error (1, errno, "cannot create temporary file");
+ else
+ {
+ ssize_t cc = write (temp_fd, pages, getpagesize ());
+ if (cc != getpagesize ())
+ error (1, errno, "cannot write to temporary file");
+ }
+}
+
+static int
+do_test (void)
+{
+ const size_t pagesize = getpagesize ();
+ FILE *f;
+ char buf[pagesize];
+ int result = 0;
+ int c;
+
+ f = fopen (temp_file, "rm");
+ if (f == NULL)
+ {
+ perror (temp_file);
+ return 1;
+ }
+
+ if (fread (buf, pagesize, 1, f) != 1)
+ {
+ perror ("fread");
+ return 1;
+ }
+
+ if (memcmp (buf, pages, pagesize))
+ {
+ puts ("data mismatch in page 1");
+ result = 1;
+ }
+
+ printf ("feof = %d, ferror = %d immediately after fread\n",
+ feof (f), ferror (f));
+
+ c = fgetc (f);
+ if (c == EOF)
+ printf ("fgetc -> EOF (feof = %d, ferror = %d)\n",
+ feof (f), ferror (f));
+ else
+ {
+ printf ("fgetc returned %o (feof = %d, ferror = %d)\n",
+ c, feof (f), ferror (f));
+ result = 1;
+ }
+
+ c = write (temp_fd, pages + pagesize, pagesize);
+ if (c == (ssize_t) pagesize)
+ printf ("wrote more to file\n");
+ else
+ {
+ printf ("wrote %d != %zd (%m)\n", c, pagesize);
+ result = 1;
+ }
+
+ if (fread (buf, pagesize, 1, f) != 1)
+ {
+ printf ("second fread fails: feof = %d, ferror = %d (%m)\n",
+ feof (f), ferror (f));
+ clearerr (f);
+ if (fread (buf, pagesize, 1, f) != 1)
+ {
+ printf ("retry fread fails: feof = %d, ferror = %d (%m)\n",
+ feof (f), ferror (f));
+ result = 1;
+ }
+ }
+ if (result == 0 && memcmp (buf, pages + pagesize, pagesize))
+ {
+ puts ("data mismatch in page 2");
+ result = 1;
+ }
+
+ fseek (f, pagesize - 1, SEEK_SET);
+ c = fgetc (f);
+ if (c != 'a')
+ {
+ printf ("fgetc at end of page 1 read '%c' (%m)\n", c);
+ result = 1;
+ }
+
+ if (ftruncate (temp_fd, pagesize) < 0)
+ {
+ printf ("ftruncate failed: %m\n");
+ result = 1;
+ }
+
+ fflush (f);
+
+ c = fgetc (f);
+ if (c == EOF)
+ printf ("after truncate fgetc -> EOF (feof = %d, ferror = %d)\n",
+ feof (f), ferror (f));
+ else
+ {
+ printf ("after truncate fgetc returned '%c' (feof = %d, ferror = %d)\n",
+ c, feof (f), ferror (f));
+ result = 1;
+ }
+
+ fclose (f);
+
+ return result;
+}