Move files to libpthread/ for inclusion along hurd

1 files changed, 72 insertions, 0 deletions

diff --git a/libpthread/signal/sigaction.c b/libpthread/signal/sigaction.c
new file mode 100644
index 00000000..0126c99d
--- /dev/null
+++ b/libpthread/signal/sigaction.c
@@ -0,0 +1,72 @@
+/* sigaction.c - Generic sigaction implementation.
+   Copyright (C) 2008 Free Software Foundation, Inc.
+   Written by Neal H. Walfield <neal@gnu.org>.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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 3 of
+   the License, or (at your option) any later version.
+
+   The GNU Hurd 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 this program.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include "sig-internal.h"
+#include "pt-internal.h"
+
+int
+sigaction (int sig, const struct sigaction *restrict sa,
+	   struct sigaction *restrict osa)
+{
+  if (sig <= 0 || sig >= NSIG)
+    {
+      errno = EINVAL;
+      return -1;
+    }
+
+  struct signal_state *ss = &_pthread_self ()->ss;
+
+  pthread_mutex_lock (&ss->lock);
+
+  if (osa)
+    *osa = ss->actions[sig - 1];
+
+  if (sa)
+    {
+      ss->actions[sig - 1] = *sa;
+
+      /* "The SIGKILL and SIGSTOP signals shall not be added to the
+	 signal mask using this mechanism; this restriction shall be
+	 enforced by the system without causing an error to be
+	 indicated" (sigaction).  */
+      sigdelset (&ss->blocked, SIGKILL);
+      sigdelset (&ss->blocked, SIGSTOP);
+
+      /* A "signal shall remain pending on the process until it is
+	 unblocked, it is accepted when ..., or the action associated
+	 with it is set to ignore the signal"  (2.4.1).
+
+         "Setting a signal action to SIG_DFL for a signal that is
+         pending, and whose default action is to ignore the signal,
+         ..., shall cause the pending signal to be discarded, whether
+         or not it is blocked" (2.4.3).  */
+      if (sa->sa_handler == SIG_IGN
+	  || (sa->sa_handler == SIG_DFL && default_action (sig) == sig_ignore))
+	{
+	  sigdelset (&ss->pending, sig);
+	  sigdelset (&process_pending, sig);
+	}
+    }
+
+  pthread_mutex_unlock (&ss->lock);
+
+  return 0;
+}
+