-/* Copyright (C) 1991-2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2019 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
/*
* ISO C99 Standard: 7.14 Signal handling <signal.h>
*/
#ifndef _SIGNAL_H
-
-#if !defined __need_sig_atomic_t && !defined __need_sigset_t
-# define _SIGNAL_H
-#endif
+#define _SIGNAL_H
#include <features.h>
__BEGIN_DECLS
-#include <bits/sigset.h> /* __sigset_t, __sig_atomic_t. */
+#include <bits/types.h>
+#include <bits/signum.h>
-/* 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
+#include <bits/types/sig_atomic_t.h>
-#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
+#if defined __USE_POSIX
+#include <bits/types/sigset_t.h>
#endif
-#ifdef _SIGNAL_H
-
-#include <bits/types.h>
-#include <bits/signum.h>
-
-#ifdef __USE_XOPEN
+#if defined __USE_XOPEN || defined __USE_XOPEN2K
# ifndef __pid_t_defined
typedef __pid_t pid_t;
# define __pid_t_defined
+#endif
+#ifdef __USE_XOPEN
# endif
# ifndef __uid_t_defined
typedef __uid_t uid_t;
# endif
#endif /* Unix98 */
+#ifdef __USE_POSIX199309
+/* We need `struct timespec' later on. */
+# include <bits/types/struct_timespec.h>
+#endif
+
+#if defined __USE_POSIX199309 || defined __USE_XOPEN_EXTENDED
+# include <bits/types/siginfo_t.h>
+# include <bits/siginfo-consts.h>
+#endif
+
+#ifdef __USE_MISC
+# include <bits/types/sigval_t.h>
+#endif
+
+#ifdef __USE_POSIX199309
+# include <bits/types/sigevent_t.h>
+# include <bits/sigevent-consts.h>
+#endif
+
/* Type of a signal handler. */
typedef void (*__sighandler_t) (int);
/* 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
-#ifdef __USE_BSD
-extern __sighandler_t signal (int __sig, __sighandler_t __handler) __THROW;
+#ifdef __USE_MISC
+extern __sighandler_t signal (int __sig, __sighandler_t __handler)
+ __THROW;
#else
/* Make sure the used `signal' implementation is the SVID version. */
-# ifdef __REDIRECT
-extern __sighandler_t __REDIRECT (signal,
- (int __sig,
- __sighandler_t __handler) __THROW,
- __sysv_signal);
+# 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
-#ifdef __USE_XOPEN
+#if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8
/* 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;
+extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
+ __THROW;
#endif
/* Send signal SIG to process number PID. If PID is zero,
extern int kill (__pid_t __pid, int __sig) __THROW;
#endif /* Use POSIX. */
-#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
+#if defined __USE_MISC || 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 /* Use BSD || X/Open Unix. */
+#endif /* Use misc || X/Open Unix. */
-__BEGIN_NAMESPACE_STD
/* Raise signal SIG, i.e., send SIG to yourself. */
extern int raise (int __sig) __THROW;
-__END_NAMESPACE_STD
-#ifdef __USE_SVID
+#ifdef __USE_MISC
/* SVID names for the same things. */
-extern __sighandler_t ssignal (int __sig, __sighandler_t __handler) __THROW;
+extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
+ __THROW;
extern int gsignal (int __sig) __THROW;
-#endif /* Use SVID. */
+#endif /* Use misc. */
-#ifdef __USE_MISC
+#ifdef __USE_XOPEN2K8
/* Print a message describing the meaning of the given signal number. */
-extern void psignal (int __sig, __const char *__s);
-#endif /* Use misc. */
+extern void psignal (int __sig, const char *__s);
+/* Print a message describing the meaning of the given signal information. */
+extern void psiginfo (const siginfo_t *__pinfo, const char *__s);
+#endif /* POSIX 2008. */
-/* 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.
+
+
+/* The `sigpause' function in X/Open defines the argument as the
+ signal number. This requires redirecting to another function
+ because the default version in glibc uses an old BSD interface.
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;
-# define sigpause(mask) __sigpause ((mask), 0)
-#else
-# ifdef __USE_XOPEN
-# ifdef __GNUC__
+#ifdef __USE_XOPEN_EXTENDED
+# ifdef __GNUC__
extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");
-# else
+# else
+extern int __sigpause (int __sig_or_mask, int __is_sig);
/* Remove a signal from the signal mask and suspend the process. */
-# define sigpause(sig) __sigpause ((sig), 1)
-# endif
+# define sigpause(sig) __sigpause ((sig), 1)
# endif
#endif
-#ifdef __USE_BSD
+#ifdef __USE_MISC
/* 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)
+# define sigmask(sig) ((int)(1u << ((sig) - 1)))
/* Block signals in MASK, returning the old mask. */
-extern int sigblock (int __mask) __THROW;
+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;
+extern int sigsetmask (int __mask) __THROW __attribute_deprecated__;
/* Return currently selected signal mask. */
-extern int siggetmask (void) __THROW;
-#endif /* Use BSD. */
+extern int siggetmask (void) __THROW __attribute_deprecated__;
+#endif /* Use misc. */
#ifdef __USE_MISC
#endif
/* 4.4 BSD uses the name `sig_t' for this. */
-#ifdef __USE_BSD
+#ifdef __USE_MISC
typedef __sighandler_t sig_t;
#endif
#ifdef __USE_POSIX
-# ifdef __USE_POSIX199309
-/* We need `struct timespec' later on. */
-# define __need_timespec
-# include <time.h>
-
-/* Get the `siginfo_t' type plus the needed symbols. */
-# include <bits/siginfo.h>
-# endif
-
/* Clear all signals from SET. */
-extern int sigemptyset (sigset_t *__set) __THROW;
+extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
/* Set all signals in SET. */
-extern int sigfillset (sigset_t *__set) __THROW;
+extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
/* Add SIGNO to SET. */
-extern int sigaddset (sigset_t *__set, int __signo) __THROW;
+extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
/* Remove SIGNO from SET. */
-extern int sigdelset (sigset_t *__set, int __signo) __THROW;
+extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
/* Return 1 if SIGNO is in SET, 0 if not. */
-extern int sigismember (__const sigset_t *__set, int __signo) __THROW;
+extern int sigismember (const sigset_t *__set, int __signo)
+ __THROW __nonnull ((1));
# ifdef __USE_GNU
/* Return non-empty value is SET is not empty. */
-extern int sigisemptyset (__const sigset_t *__set) __THROW;
+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;
+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;
+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'
# include <bits/sigaction.h>
/* Get and/or change the set of blocked signals. */
-extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
+extern int sigprocmask (int __how, const sigset_t *__restrict __set,
sigset_t *__restrict __oset) __THROW;
/* Change the set of blocked signals to SET,
This function is a cancellation point and therefore not marked with
__THROW. */
-extern int sigsuspend (__const sigset_t *__set);
+extern int sigsuspend (const sigset_t *__set) __nonnull ((1));
/* Get and/or set the action for signal SIG. */
-extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
+extern int sigaction (int __sig, const struct sigaction *__restrict __act,
struct sigaction *__restrict __oact) __THROW;
/* Put in SET all signals that are blocked and waiting to be delivered. */
-extern int sigpending (sigset_t *__set) __THROW;
+extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
+# ifdef __USE_POSIX199506
/* 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);
+extern int sigwait (const sigset_t *__restrict __set, int *__restrict __sig)
+ __nonnull ((1, 2));
+# endif /* Use POSIX 1995. */
# ifdef __USE_POSIX199309
/* 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);
+extern int sigwaitinfo (const sigset_t *__restrict __set,
+ siginfo_t *__restrict __info) __nonnull ((1));
/* 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,
+extern int sigtimedwait (const sigset_t *__restrict __set,
siginfo_t *__restrict __info,
- __const struct timespec *__restrict __timeout);
+ const struct timespec *__restrict __timeout)
+ __nonnull ((1));
/* 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)
+extern int sigqueue (__pid_t __pid, int __sig, const union sigval __val)
__THROW;
# endif /* Use POSIX 199306. */
#endif /* Use POSIX. */
-#ifdef __USE_BSD
+#ifdef __USE_MISC
/* Names of the signals. This variable exists only for compatibility.
Use `strsignal' instead (see <string.h>). */
-extern __const char *__const _sys_siglist[_NSIG];
-extern __const char *__const sys_siglist[_NSIG];
-
-/* 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. */
-
-
-/* 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;
+extern const char *const _sys_siglist[_NSIG];
+extern const char *const sys_siglist[_NSIG];
/* Get machine-dependent `struct sigcontext' and signal subcodes. */
/* Restore the state saved in SCP. */
extern int sigreturn (struct sigcontext *__scp) __THROW;
-#endif /* use BSD. */
+#endif /* Use misc. */
+
+#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
+# define __need_size_t
+# include <stddef.h>
-#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
+# include <bits/types/stack_t.h>
+# if defined __USE_XOPEN || defined __USE_XOPEN2K8
+/* This will define `ucontext_t' and `mcontext_t'. */
+# include <sys/ucontext.h>
+# endif
+#endif /* Use POSIX.1-2008 or X/Open Unix. */
+#if defined __USE_XOPEN_EXTENDED || defined __USE_MISC
/* 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;
# include <bits/sigstack.h>
-# ifdef __USE_XOPEN
-/* This will define `ucontext_t' and `mcontext_t'. */
-# include <sys/ucontext.h>
-# endif
-
-/* 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;
+# include <bits/ss_flags.h>
/* 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;
+extern int sigaltstack (const stack_t *__restrict __ss,
+ stack_t *__restrict __oss) __THROW;
+#endif /* __USE_XOPEN_EXTENDED || __USE_MISC */
-#endif /* use BSD or X/Open Unix. */
+#if ((defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
+ || defined __USE_MISC)
+# include <bits/types/struct_sigstack.h>
+#endif
+
+#if ((defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \
+ || defined __USE_MISC)
+/* 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
#ifdef __USE_XOPEN_EXTENDED
/* Simplified interface for signal management. */
/* Return number of available real-time signal with lowest priority. */
extern int __libc_current_sigrtmax (void) __THROW;
-#endif /* signal.h */
+#define SIGRTMIN (__libc_current_sigrtmin ())
+#define SIGRTMAX (__libc_current_sigrtmax ())
+
+/* System-specific extensions. */
+#include <bits/signal_ext.h>
__END_DECLS
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