-/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1991-2003, 2004, 2007, 2009 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 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
-Library General Public License for more details.
+ 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 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. */
+ 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/>. */
/*
- * ANSI Standard: 4.7 SIGNAL HANDLING <signal.h>
+ * ISO C99 Standard: 7.14 Signal handling <signal.h>
*/
-#ifndef _SIGNAL_H
-#define _SIGNAL_H
+#ifndef _SIGNAL_H
+
+#if !defined __need_sig_atomic_t && !defined __need_sigset_t
+# define _SIGNAL_H
+#endif
#include <features.h>
-#include <sys/types.h>
-#include <linux/signal.h>
-#ifndef SIGCLD
-#define SIGCLD SIGCHLD
-#endif
+__BEGIN_DECLS
-/* SVR4 */
-#ifndef SA_RESETHAND
-#define SA_RESETHAND SA_ONESHOT
+#include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
+
+/* An integral type that can be modified atomically, without the
+ possibility of a signal arriving in the middle of the operation. */
+#if defined __need_sig_atomic_t || defined _SIGNAL_H
+# ifndef __sig_atomic_t_defined
+# define __sig_atomic_t_defined
+__BEGIN_NAMESPACE_STD
+typedef __sig_atomic_t sig_atomic_t;
+__END_NAMESPACE_STD
+# endif
+# undef __need_sig_atomic_t
#endif
-/* SVR4 */
-#ifndef SA_NODEFER
-#define SA_NODEFER SA_NOMASK
+#if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
+# ifndef __sigset_t_defined
+# define __sigset_t_defined
+typedef __sigset_t sigset_t;
+# endif
+# undef __need_sigset_t
#endif
-typedef int sig_atomic_t;
+#ifdef _SIGNAL_H
-typedef __sighandler_t SignalHandler;
+#include <bits/types.h>
+#include <bits/signum.h>
-#ifndef BADSIG
-#define BADSIG SIG_ERR
+/* Fake signal functions. */
+#define SIG_ERR ((__sighandler_t) -1) /* Error return. */
+#define SIG_DFL ((__sighandler_t) 0) /* Default action. */
+#define SIG_IGN ((__sighandler_t) 1) /* Ignore signal. */
+#ifdef __USE_UNIX98
+# define SIG_HOLD ((__sighandler_t) 2) /* Add signal to hold mask. */
+#endif
+/* Biggest signal number + 1 (including real-time signals). */
+#ifndef _NSIG /* if arch has not defined it in bits/signum.h... */
+# define _NSIG 65
#endif
+#ifdef __USE_MISC
+# define NSIG _NSIG
+#endif
+/* Real-time signal range */
+#define SIGRTMIN (__libc_current_sigrtmin())
+#define SIGRTMAX (__libc_current_sigrtmax())
+/* These are the hard limits of the kernel. These values should not be
+ used directly at user level. */
+#ifndef __SIGRTMIN /* if arch has not defined it in bits/signum.h... */
+# define __SIGRTMIN 32
+#endif
+#define __SIGRTMAX (_NSIG - 1)
-/* The Interviews version also has these ... */
-#define SignalBad ((SignalHandler)-1)
-#define SignalDefault ((SignalHandler)0)
-#define SignalIgnore ((SignalHandler)1)
+#if defined __USE_XOPEN || defined __USE_XOPEN2K
+# ifndef __pid_t_defined
+typedef __pid_t pid_t;
+# define __pid_t_defined
+# endif
+#endif
+#ifdef __USE_XOPEN
+# ifndef __uid_t_defined
+typedef __uid_t uid_t;
+# define __uid_t_defined
+# endif
+#endif /* Unix98 */
+
+#if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
+/* We need `struct timespec' later on. */
+# define __need_timespec
+# include <time.h>
+#endif
-__BEGIN_DECLS
+#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
+/* Get the `siginfo_t' type plus the needed symbols. */
+# include <bits/siginfo.h>
+#endif
-extern __const char * __const sys_siglist[];
-extern __const char * __const _sys_siglist[];
-
-extern __sighandler_t
- signal __P ((int __sig, __sighandler_t));
-extern __sighandler_t
- __signal __P ((int __sig, __sighandler_t, int flags));
-extern int raise __P ((int __sig));
-extern int __kill __P ((pid_t __pid, int __sig));
-extern int kill __P ((pid_t __pid, int __sig));
-extern int killpg __P ((int __pgrp, int __sig));
-extern int sigaddset __P ((sigset_t *__mask, int __sig));
-extern int sigdelset __P ((sigset_t *__mask, int __sig));
-extern int sigemptyset __P ((sigset_t *__mask));
-extern int sigfillset __P ((sigset_t *__mask));
-extern int sigismember __P ((__const sigset_t *__mask, int __sig));
-extern int sigpending __P ((sigset_t *__set));
-
-extern int __sigprocmask __P ((int __how, __const sigset_t *__set,
- sigset_t *__oldset));
-extern int sigprocmask __P ((int __how, __const sigset_t *__set,
- sigset_t *__oldset));
-
-extern int sigsuspend __P ((__const sigset_t *sigmask));
-
-extern int __sigaction __P ((int __sig, struct sigaction *__act,
- struct sigaction *__oldact));
-extern int sigaction __P ((int __sig, struct sigaction *__act,
- struct sigaction *__oldact));
-
-#define __sigemptyset(set) ((*(set) = 0L), 0)
-#define __sigfillset(set) ((*(set) = -1L), 0)
-#define __sigaddset(set, sig) ((*(set) |= __sigmask (sig)), 0)
-#define __sigdelset(set, sig) ((*(set) &= ~__sigmask (sig)), 0)
-#define __sigismember(set, sig) ((*(set) & __sigmask (sig)) ? 1 : 0)
-
-
-#if 1
-#define sigemptyset __sigemptyset
-#define sigfillset __sigfillset
-
-/* We don't do that any more since it causes problems due to
- * "sig" > _NSIG and "sig" < 1. It isn't worth the touble to make
- * them inline and static. Use __sigxxxxx if you want speed with
- * correct "sig".
- */
-#if 1
-#define sigaddset __sigaddset
-#define sigdelset __sigdelset
-#define sigismember __sigismember
+
+/* Type of a signal handler. */
+typedef void (*__sighandler_t) (int);
+
+#if defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
+/* The X/Open definition of `signal' specifies the SVID semantic. Use
+ the additional function `sysv_signal' when X/Open compatibility is
+ requested. */
+extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
+ __THROW;
+# ifdef __USE_GNU
+extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
+ __THROW;
+# endif
+#endif /* __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__ */
+
+/* Set the handler for the signal SIG to HANDLER, returning the old
+ handler, or SIG_ERR on error.
+ By default `signal' has the BSD semantic. */
+__BEGIN_NAMESPACE_STD
+#if defined __USE_BSD || !defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
+extern __sighandler_t signal (int __sig, __sighandler_t __handler)
+ __THROW;
+libc_hidden_proto(signal)
+#else
+/* Make sure the used `signal' implementation is the SVID version. */
+# ifdef __REDIRECT_NTH
+extern __sighandler_t __REDIRECT_NTH (signal,
+ (int __sig, __sighandler_t __handler),
+ __sysv_signal);
+# else
+# define signal __sysv_signal
+# endif
#endif
+__END_NAMESPACE_STD
+#if defined __USE_XOPEN && defined __UCLIBC_SUSV3_LEGACY__
+/* The X/Open definition of `signal' conflicts with the BSD version.
+ So they defined another function `bsd_signal'. */
+extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
+ __THROW;
#endif
+/* Send signal SIG to process number PID. If PID is zero,
+ send SIG to all processes in the current process's process group.
+ If PID is < -1, send SIG to all processes in process group - PID. */
+#ifdef __USE_POSIX
+extern int kill (__pid_t __pid, int __sig) __THROW;
+libc_hidden_proto(kill)
+#endif
-/* Return a mask that includes SIG only. */
-#define __sigmask(sig) (1 << ((sig) - 1))
+#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
+/* Send SIG to all processes in process group PGRP.
+ If PGRP is zero, send SIG to all processes in
+ the current process's process group. */
+extern int killpg (__pid_t __pgrp, int __sig) __THROW;
+#endif
-extern int __sigsetmask __P ((int __mask));
-extern int __siggetmask __P ((void));
-extern int __sigblock __P ((int __mask));
-extern int __sigpause __P ((int __mask));
+__BEGIN_NAMESPACE_STD
+/* Raise signal SIG, i.e., send SIG to yourself. */
+extern int raise (int __sig) __THROW;
+libc_hidden_proto(raise)
+__END_NAMESPACE_STD
-#ifdef __USE_SVID
+#if 0 /*def __USE_SVID*/
/* SVID names for the same things. */
-extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler));
-extern int gsignal __P ((int __sig));
-
+extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
+ __THROW;
+extern int gsignal (int __sig) __THROW;
#endif /* Use SVID. */
-
-/* BSD */
+
+/* glibc guards the next two wrong with __USE_XOPEN2K */
+#if defined __USE_MISC || defined __USE_XOPEN2K8
+/* Print a message describing the meaning of the given signal number. */
+extern void psignal (int __sig, const char *__s);
+#endif /* Use misc or POSIX 2008. */
+
+#if 0 /*def __USE_XOPEN2K8*/
+/* Print a message describing the meaning of the given signal information. */
+extern void psiginfo (const siginfo_t *__pinfo, const char *__s);
+#endif /* POSIX 2008. */
+
+#ifdef __UCLIBC_SUSV4_LEGACY__
+/* The `sigpause' function has two different interfaces. The original
+ BSD definition defines the argument as a mask of the signal, while
+ the more modern interface in X/Open defines it as the signal
+ number. We go with the BSD version unless the user explicitly
+ selects the X/Open version.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+/*extern int __sigpause (int __sig_or_mask, int __is_sig);*/
+
+#ifdef __FAVOR_BSD
+/* Set the mask of blocked signals to MASK,
+ wait for a signal to arrive, and then restore the mask. */
+/*extern int sigpause (int __mask) __THROW __attribute_deprecated__;
+# define sigpause(mask) __sigpause ((mask), 0)*/
+/* uClibc note: BSD sigpause is available as __bsd_sigpause.
+ * It is intentionally not prototyped */
+#else
+# ifdef __USE_XOPEN
+/* Remove a signal from the signal mask and suspend the process. */
+extern int sigpause(int __sig);
+/*# define sigpause(sig) __sigpause ((sig), 1)*/
+# endif
+#endif
+#endif /* __UCLIBC_SUSV4_LEGACY__ */
+
+#if 0 /*def __USE_BSD*/
+/* None of the following functions should be used anymore. They are here
+ only for compatibility. A single word (`int') is not guaranteed to be
+ enough to hold a complete signal mask and therefore these functions
+ simply do not work in many situations. Use `sigprocmask' instead. */
+
+/* Compute mask for signal SIG. */
+# define sigmask(sig) __sigmask(sig)
+
+/* Block signals in MASK, returning the old mask. */
+extern int sigblock (int __mask) __THROW __attribute_deprecated__;
+
+/* Set the mask of blocked signals to MASK, returning the old mask. */
+extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
+
+/* Return currently selected signal mask. */
+extern int siggetmask (void) __THROW __attribute_deprecated__;
+#endif /* Use BSD. */
+
+
+#ifdef __USE_GNU
+typedef __sighandler_t sighandler_t;
+#endif
+
+/* 4.4 BSD uses the name `sig_t' for this. */
#ifdef __USE_BSD
-#define sigmask __sigmask
+typedef __sighandler_t sig_t;
+#endif
-extern int sigblock __P ((int __mask));
-extern int sigpause __P ((int __mask));
-extern int sigsetmask __P ((int __mask));
-extern int siggetmask __P ((void));
-extern void psignal __P ((int __sig, __const char *__str));
+#ifdef __USE_POSIX
-extern int siginterrupt __P ((int __sig, int __flag));
+/* Clear all signals from SET. */
+extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
-/* The `sig' bit is set if the interrupt on it
- * is enabled via siginterrupt (). */
-extern sigset_t _sigintr;
+/* Set all signals in SET. */
+extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
-#endif /* Use BSD. */
+/* Add SIGNO to SET. */
+extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
+libc_hidden_proto(sigaddset)
-#ifdef __USE_BSD_SIGNAL
+/* Remove SIGNO from SET. */
+extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
+libc_hidden_proto(sigdelset)
-extern __sighandler_t
- __bsd_signal __P ((int __sig, __sighandler_t));
-#define signal __bsd_signal
+/* Return 1 if SIGNO is in SET, 0 if not. */
+extern int sigismember (const sigset_t *__set, int __signo)
+ __THROW __nonnull ((1));
-#endif /* __USE_BSD_SIGNAL */
+# ifdef __USE_GNU
+/* Return non-empty value is SET is not empty. */
+extern int sigisemptyset (const sigset_t *__set) __THROW __nonnull ((1));
+
+/* Build new signal set by combining the two inputs set using logical AND. */
+extern int sigandset (sigset_t *__set, const sigset_t *__left,
+ const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
+
+/* Build new signal set by combining the two inputs set using logical OR. */
+extern int sigorset (sigset_t *__set, const sigset_t *__left,
+ const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
+# endif /* GNU */
+
+/* Get the system-specific definitions of `struct sigaction'
+ and the `SA_*' and `SIG_*'. constants. */
+# include <bits/sigaction.h>
+
+/* Get and/or change the set of blocked signals. */
+extern int sigprocmask (int __how, const sigset_t *__restrict __set,
+ sigset_t *__restrict __oset) __THROW;
+libc_hidden_proto(sigprocmask)
+
+/* Change the set of blocked signals to SET,
+ wait until a signal arrives, and restore the set of blocked signals.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern int sigsuspend (const sigset_t *__set) __nonnull ((1));
+#ifdef _LIBC
+extern __typeof(sigsuspend) __sigsuspend_nocancel attribute_hidden;
+libc_hidden_proto(sigsuspend)
+#endif
+
+/* Get and/or set the action for signal SIG. */
+extern int sigaction (int __sig, const struct sigaction *__restrict __act,
+ struct sigaction *__restrict __oact) __THROW;
+#ifdef _LIBC
+# if 0 /* this is in headers */
+/* In uclibc, userspace struct sigaction is identical to
+ * "new" struct kernel_sigaction (one from the Linux 2.1.68 kernel).
+ * See sigaction.h
+ */
+struct old_kernel_sigaction;
+extern int __syscall_sigaction(int, const struct old_kernel_sigaction *,
+ struct old_kernel_sigaction *) attribute_hidden;
+# else /* this is how the function is built */
+extern __typeof(sigaction) __syscall_sigaction attribute_hidden;
+# endif
+# define __need_size_t
+# include <stddef.h>
+/* candidate for attribute_hidden, if NPTL would behave */
+extern int __syscall_rt_sigaction(int, const struct sigaction *,
+ struct sigaction *, size_t)
+# ifndef __UCLIBC_HAS_THREADS_NATIVE__
+ attribute_hidden
+# endif
+ ;
+extern __typeof(sigaction) __libc_sigaction;
+libc_hidden_proto(sigaction)
+
+# ifdef __mips__
+# define _KERNEL_NSIG_WORDS (_NSIG / _MIPS_SZLONG)
+typedef struct {
+ unsigned long sig[_KERNEL_NSIG_WORDS];
+} kernel_sigset_t;
+# define __SYSCALL_SIGSET_T_SIZE (sizeof(kernel_sigset_t))
+# else
+# define __SYSCALL_SIGSET_T_SIZE (_NSIG / 8)
+# endif
+#endif
+
+/* Put in SET all signals that are blocked and waiting to be delivered. */
+extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
-__END_DECLS
-#if _MIT_POSIX_THREADS
-#define __SIGFILLSET 0xffffffff
-#define __SIGEMPTYSET 0
-#define __SIGADDSET(s,n) ((*s) |= (1 << ((n) - 1)))
-#define __SIGDELSET(s,n) ((*s) &= ~(1 << ((n) - 1)))
-#define __SIGISMEMBER(s,n) ((*s) & (1 << ((n) - 1)))
+/* Select any of pending signals from SET or wait for any to arrive.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern int sigwait (const sigset_t *__restrict __set, int *__restrict __sig)
+ __nonnull ((1, 2));
+
+# if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
+/* Select any of pending signals from SET and place information in INFO.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern int sigwaitinfo (const sigset_t *__restrict __set,
+ siginfo_t *__restrict __info) __nonnull ((1));
+#ifdef _LIBC
+extern __typeof(sigwaitinfo) __sigwaitinfo attribute_hidden;
+#endif
+
+/* Select any of pending signals from SET and place information in INFO.
+ Wait the time specified by TIMEOUT if no signal is pending.
+
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
+extern int sigtimedwait (const sigset_t *__restrict __set,
+ siginfo_t *__restrict __info,
+ const struct timespec *__restrict __timeout)
+ __nonnull ((1));
+#ifdef _LIBC
+extern __typeof(sigtimedwait) __sigtimedwait_nocancel attribute_hidden;
+libc_hidden_proto(sigtimedwait)
+#endif
+
+/* Send signal SIG to the process PID. Associate data in VAL with the
+ signal. */
+extern int sigqueue (__pid_t __pid, int __sig, const union sigval __val)
+ __THROW;
+# endif /* Use POSIX 199306. */
+
+#endif /* Use POSIX. */
+
+#ifdef __USE_BSD
+
+# ifdef __UCLIBC_HAS_SYS_SIGLIST__
+/* Names of the signals. This variable exists only for compatibility.
+ Use `strsignal' instead (see <string.h>). */
+# define _sys_siglist sys_siglist
+extern const char *const sys_siglist[_NSIG];
+# endif
+
+#ifndef __UCLIBC_STRICT_HEADERS__
+/* Structure passed to `sigvec'. */
+struct sigvec
+ {
+ __sighandler_t sv_handler; /* Signal handler. */
+ int sv_mask; /* Mask of signals to be blocked. */
+
+ int sv_flags; /* Flags (see below). */
+# define sv_onstack sv_flags /* 4.2 BSD compatibility. */
+ };
+
+/* Bits in `sv_flags'. */
+# define SV_ONSTACK (1 << 0)/* Take the signal on the signal stack. */
+# define SV_INTERRUPT (1 << 1)/* Do not restart system calls. */
+# define SV_RESETHAND (1 << 2)/* Reset handler to SIG_DFL on receipt. */
+#endif
+
+
+#if 0
+/* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
+ of VEC. The signals in `sv_mask' will be blocked while the handler runs.
+ If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
+ reset to SIG_DFL before `sv_handler' is entered. If OVEC is non-NULL,
+ it is filled in with the old information for SIG. */
+extern int sigvec (int __sig, const struct sigvec *__vec,
+ struct sigvec *__ovec) __THROW;
+#endif
+
+
+/* Get machine-dependent `struct sigcontext' and signal subcodes. */
+# include <bits/sigcontext.h>
+
+#if 0
+/* Restore the state saved in SCP. */
+extern int sigreturn (struct sigcontext *__scp) __THROW;
+#endif
+
+#endif /* use BSD. */
+
+
+#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
+# define __need_size_t
+# include <stddef.h>
+
+# ifdef __UCLIBC_SUSV4_LEGACY__
+/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
+ (causing them to fail with EINTR); if INTERRUPT is zero, make system
+ calls be restarted after signal SIG. */
+extern int siginterrupt (int __sig, int __interrupt) __THROW;
+# endif
+
+# include <bits/sigstack.h>
+# ifdef __USE_XOPEN
+/* This will define `ucontext_t' and `mcontext_t'. */
+/* SuSv4 obsoleted include/ucontext.h */
+# include <sys/ucontext.h>
+# endif
+
+# if 0
+/* Run signals handlers on the stack specified by SS (if not NULL).
+ If OSS is not NULL, it is filled in with the old signal stack status.
+ This interface is obsolete and on many platform not implemented. */
+extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
+ __THROW __attribute_deprecated__;
+# endif
+
+/* Alternate signal handler stack interface.
+ This interface should always be preferred over `sigstack'. */
+extern int sigaltstack (const struct sigaltstack *__restrict __ss,
+ struct sigaltstack *__restrict __oss) __THROW;
+
+#endif /* use BSD or X/Open Unix. */
+
+#if defined __USE_XOPEN_EXTENDED && defined __UCLIBC_HAS_OBSOLETE_BSD_SIGNAL__
+/* Simplified interface for signal management. */
+
+/* Add SIG to the calling process' signal mask. */
+extern int sighold (int __sig) __THROW;
+
+/* Remove SIG from the calling process' signal mask. */
+extern int sigrelse (int __sig) __THROW;
+
+/* Set the disposition of SIG to SIG_IGN. */
+extern int sigignore (int __sig) __THROW;
+
+/* Set the disposition of SIG. */
+extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
+#endif
+
+#if defined __UCLIBC_HAS_THREADS__ && (defined __USE_POSIX199506 || defined __USE_UNIX98)
+/* Some of the functions for handling signals in threaded programs must
+ be defined here. */
+# include <bits/pthreadtypes.h>
+# include <bits/sigthread.h>
+#endif
+
+/* The following functions are used internally in the C library and in
+ other code which need deep insights. */
+
+/* Return number of available real-time signal with highest priority. */
+extern int __libc_current_sigrtmin (void) __THROW;
+/* Return number of available real-time signal with lowest priority. */
+extern int __libc_current_sigrtmax (void) __THROW;
+
+#ifdef _LIBC
+extern sigset_t _sigintr attribute_hidden;
+/* simplified version without parameter checking */
+# include <string.h>
+# undef __sigemptyset
+# define __sigemptyset(ss) (memset(ss, '\0', sizeof(sigset_t)), 0)
#endif
+#endif /* signal.h */
+
+__END_DECLS
-#endif /* _SIGNAL_H */
+#endif /* not signal.h */
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