1 files changed, 100 insertions, 0 deletions
diff --git a/libio/bug-fopena+.c b/libio/bug-fopena+.c
new file mode 100644
index 0000000..5446de1
--- /dev/null
+++ b/libio/bug-fopena+.c
@@ -0,0 +1,100 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+static int fd;
+static char *fname;
+
+
+static void prepare (void);
+#define PREPARE(argc, argv) prepare ()
+
+
+#define TEST_FUNCTION do_test ()
+static int do_test (void);
+#include "../test-skeleton.c"
+
+
+static void
+prepare (void)
+{
+  fd = create_temp_file ("wrewind.", &fname);
+  if (fd == -1)
+    exit (3);
+}
+
+
+static int
+do_test (void)
+{
+  char buf[100];
+  FILE *fp;
+  int result = 0;
+
+  fp = fdopen (fd, "w");
+  if (fp == NULL)
+    {
+      puts ("cannot create file");
+      exit (1);
+    }
+
+  if (fputs ("one\n", fp) == EOF || fputs ("two\n", fp) == EOF)
+    {
+      puts ("cannot create filec content");
+      exit (1);
+    }
+
+  fclose (fp);
+
+  fp = fopen (fname, "a+");
+  if (fp == NULL)
+    {
+      puts ("cannot fopen a+");
+      exit (1);
+    }
+
+  if (fgets (buf, sizeof (buf), fp) == NULL)
+    {
+      puts ("cannot read after fopen a+");
+      exit (1);
+    }
+
+  if (strcmp (buf, "one\n") != 0)
+    {
+      puts ("read after fopen a+ produced wrong result");
+      result = 1;
+    }
+
+  fclose (fp);
+
+  fd = open (fname, O_RDWR);
+  if (fd == -1)
+    {
+      puts ("open failed");
+      exit (1);
+    }
+
+  fp = fdopen (fd, "a+");
+  if (fp == NULL)
+    {
+      puts ("fopen after open failed");
+      exit (1);
+    }
+
+  if (fgets (buf, sizeof (buf), fp) == NULL)
+    {
+      puts ("cannot read after fdopen a+");
+      exit (1);
+    }
+
+  if (strcmp (buf, "one\n") != 0)
+    {
+      puts ("read after fdopen a+ produced wrong result");
+      result = 1;
+    }
+
+  fclose (fp);
+
+  return result;
+}