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diff --git a/sysdeps/unix/sysv/linux/sigaction.h b/sysdeps/unix/sysv/linux/sigaction.h
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+/* The proper definitions for Linux's sigaction.
+Copyright (C) 1993, 1994, 1995 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 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* 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.  */
+    unsigned long sa_flags;
+
+    /* Restore handler.  */
+    void (*sa_restorer) __P ((void));
+  };
+
+/* Bits in `sa_flags'.  */
+#define	SA_NOCLDSTOP 1		/* Don't send SIGCHLD when children stop.  */
+#ifdef __USE_MISC
+#define SA_STACK     0x08000000	/* Use signal stack by using `sa_restorer'.  */
+#define SA_RESTART   0x10000000	/* Don't restart syscall on signal return.  */
+#define SA_INTERRUPT 0x20000000	/* Historical no-op.  */
+#define SA_NODEFER   0x40000000	/* Don't automatically block the signal when
+				   its handler is being executed.  */
+#define SA_RESETHAND 0x80000000	/* Reset to SIG_DFL on entry to handler.  */
+
+/* Some aliases for the SA_ constants.  */
+#define SA_NOMASK	SA_NODEFER
+#define SA_ONESHOT	SA_RESETHAND
+#endif
+
+/* Values for the HOW argument to `sigprocmask'.  */
+#define	SIG_BLOCK	0	/* Block signals.  */
+#define	SIG_UNBLOCK	1	/* Unblock signals.  */
+#define	SIG_SETMASK	2	/* Set the set of blocked signals.  */