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diff --git a/sysdeps/unix/sysv/sysv4/sigaction.h b/sysdeps/unix/sysv/sysv4/sigaction.h
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+/* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the, 1992 Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+/* The proper definitions for SVR4's sigaction.
+   If the operating system has a `sigaction' system call that correctly
+   implements the POSIX.1 behavior, there should be a system-dependent
+   version of this file that defines `struct sigaction' and the `SA_*'
+   constants appropriately.  */
+
+/* Structure describing the action to be taken when a signal arrives.  */
+struct sigaction
+  {
+    /* Signal handler.  */
+    __sighandler_t sa_handler;
+
+    /* Additional set of signals to be blocked.  */
+    __sigset_t sa_mask;
+
+    /* Special flags.  */
+    int sa_flags;
+
+    /* Padding.  */
+    int sa_resv[2];
+  };
+
+/* Bits in `sa_flags'.  */
+#define        SA_ONSTACK      0x1     /* Take signal on signal stack.  */
+#define SA_RESETHAND   0x2     /* Reset to SIG_DFL on entry to handler.  */
+#define        SA_RESTART      0x4     /* Don't restart syscall on signal return.  */
+#define SA_SIGINFO     0x8     /* Provide additional info to the handler.  */
+#define SA_NODEFER     0x10    /* Don't automatically block the signal when
+                                  its handler is being executed.  */
+#define SA_NOSCLDWAIT  0x10000 /* Don't create zombie processes.  */
+#define        SA_NOCLDSTOP    0x20000 /* Don't send SIGCHLD when children stop.  */
+
+/* Values for the HOW argument to `sigprocmask'.  */
+#define        SIG_BLOCK       1       /* Block signals.  */
+#define        SIG_UNBLOCK     2       /* Unblock signals.  */
+#define        SIG_SETMASK     3       /* Set the set of blocked signals.  */