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, 78 insertions, 0 deletions

diff --git a/REORG.TODO/misc/pselect.c b/REORG.TODO/misc/pselect.c
new file mode 100644
index 0000000000..2292219d3d
--- /dev/null
+++ b/REORG.TODO/misc/pselect.c
@@ -0,0 +1,78 @@
+/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+   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 <errno.h>
+#include <signal.h>
+#include <stddef.h>	/* For NULL.  */
+#include <sys/time.h>
+#include <sys/select.h>
+#include <sysdep-cancel.h>
+
+
+/* Check the first NFDS descriptors each in READFDS (if not NULL) for read
+   readiness, in WRITEFDS (if not NULL) for write readiness, and in EXCEPTFDS
+   (if not NULL) for exceptional conditions.  If TIMEOUT is not NULL, time out
+   after waiting the interval specified therein.  Additionally set the sigmask
+   SIGMASK for this call.  Returns the number of ready descriptors, or -1 for
+   errors.  */
+int
+__pselect (int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
+	   const struct timespec *timeout, const sigset_t *sigmask)
+{
+  struct timeval tval;
+  int retval;
+  sigset_t savemask;
+
+  /* Change nanosecond number to microseconds.  This might mean losing
+     precision and therefore the `pselect` should be available.  But
+     for now it is hardly found.  */
+  if (timeout != NULL)
+    {
+      /* Catch bugs which would be hidden by the TIMESPEC_TO_TIMEVAL
+	 computations.  The division by 1000 truncates values.  */
+      if (__glibc_unlikely (timeout->tv_nsec < 0))
+	{
+	  __set_errno (EINVAL);
+	  return -1;
+	}
+
+      TIMESPEC_TO_TIMEVAL (&tval, timeout);
+    }
+
+  /* The setting and restoring of the signal mask and the select call
+     should be an atomic operation.  This can't be done without kernel
+     help.  */
+  if (sigmask != NULL)
+    __sigprocmask (SIG_SETMASK, sigmask, &savemask);
+
+  /* Note the pselect() is a cancellation point.  But since we call
+     select() which itself is a cancellation point we do not have
+     to do anything here.  */
+  retval = __select (nfds, readfds, writefds, exceptfds,
+		     timeout != NULL ? &tval : NULL);
+
+  if (sigmask != NULL)
+    __sigprocmask (SIG_SETMASK, &savemask, NULL);
+
+  return retval;
+}
+#ifndef __pselect
+weak_alias (__pselect, pselect)
+/* __select handles cancellation.  */
+LIBC_CANCEL_HANDLED ();
+#endif