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diff --git a/sysdeps/unix/sysv/linux/bits/sigaction.h b/sysdeps/unix/sysv/linux/bits/sigaction.h
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+/* The proper definitions for Linux's sigaction.
+ Copyright (C) 1993, 1994, 1995, 1996 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. */
+ int 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. */