Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 117 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/wordsize-64/tst-writev.c b/REORG.TODO/sysdeps/wordsize-64/tst-writev.c
new file mode 100644
index 0000000000..bda2b3fe74
--- /dev/null
+++ b/REORG.TODO/sysdeps/wordsize-64/tst-writev.c
@@ -0,0 +1,117 @@
+/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ryan S. Arnold <rsa@us.ibm.com>, 2011.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fcntl.h>
+#include <limits.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/uio.h>
+
+
+/* The purpose of this test is to verify that the INTERNAL_[V]SYSCALL_NCS
+   macros on 64-bit platforms don't cast the return type to (int) which would
+   erroneously sign extend the return value should the high bit of the bottom
+   half of the word be '1'.  */
+
+#if 0
+/* Used to test the non power-of-2 code path.  */
+#undef IOV_MAX
+#define IOV_MAX 1000
+#endif
+
+/* writev() should report that it has written EXPECTED number of bytes.  */
+#define EXPECTED ((size_t) INT32_MAX + 1)
+
+static int
+do_test (void)
+{
+  struct iovec iv[IOV_MAX];
+  /* POSIX doesn't guarantee that IOV_MAX is pow of 2 but we're optimistic.  */
+  size_t bufsz = EXPECTED / IOV_MAX;
+  size_t bufrem = EXPECTED % IOV_MAX;
+
+  /* If there's a remainder then IOV_MAX probably isn't a power of 2 and we
+     need to make bufsz bigger so that the last iovec, iv[IOV_MAX-1], is free
+     for the remainder.  */
+  if (bufrem)
+    {
+      bufsz = bufsz + 1;
+      bufrem = EXPECTED - (bufsz * (IOV_MAX - 1));
+    }
+
+  /* We writev to /dev/null since we're just testing writev's return value.  */
+  int fd = open (_PATH_DEVNULL, O_WRONLY);
+  if (fd == -1)
+    {
+      printf ("Unable to open /dev/null for writing.\n");
+      return -1;
+    }
+
+  iv[0].iov_base = malloc (bufsz);
+  if (iv[0].iov_base == NULL)
+    {
+      printf ("malloc (%zu) failed.\n", bufsz);
+      close (fd);
+      return -1;
+    }
+  iv[0].iov_len = bufsz;
+
+  /* We optimistically presume that there isn't a remainder and set all iovec
+     instances to the same base and len as the first instance.  */
+  for (int i = 1; i < IOV_MAX; i++)
+    {
+      /* We don't care what the data is so reuse the allocation from iv[0];  */
+      iv[i].iov_base = iv[0].iov_base;
+      iv[i].iov_len = iv[0].iov_len;
+    }
+
+  /* If there is a remainder then we correct the last iov_len.  */
+  if (bufrem)
+    iv[IOV_MAX - 1].iov_len = bufrem;
+
+  /* Write junk to /dev/null with the writev syscall in order to get a return
+     of INT32_MAX+1 bytes to verify that the INTERNAL_SYSCALL wrappers aren't
+     mangling the result if the signbit of a 32-bit number is set.  */
+  ssize_t ret = writev (fd, iv, IOV_MAX);
+
+  free (iv[0].iov_base);
+  close (fd);
+
+  if (ret != (ssize_t) EXPECTED)
+    {
+#ifdef ARTIFICIAL_LIMIT
+      if (ret != (ssize_t) ARTIFICIAL_LIMIT)
+#endif
+	{
+	  printf ("writev() return value: %zd != EXPECTED: %zd\n",
+		  ret, EXPECTED);
+	  return 1;
+	}
+    }
+
+  return 0;
+}
+
+/* Time enough for a large writev syscall to complete.  */
+#define TIMEOUT 20
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"