-/* Copyright (C) 1991, 92, 93, 94, 95, 96 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
- 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.
+ 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.
+ 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 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, 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/>. */
/*
- * ISO C Standard: 4.7 SIGNAL HANDLING <signal.h>
+ * ISO C99 Standard: 7.14 Signal handling <signal.h>
*/
#ifndef _SIGNAL_H
+#define _SIGNAL_H
-#if !defined(__need_sig_atomic_t) && !defined(__need_sigset_t)
-#define _SIGNAL_H 1
#include <features.h>
-#endif
__BEGIN_DECLS
-#include <gnu/types.h>
-#include <sigset.h> /* __sigset_t, __sig_atomic_t. */
+#include <bits/types.h>
+#include <bits/signum.h>
+
+#include <bits/types/sig_atomic_t.h>
+
+#if defined __USE_POSIX
+#include <bits/types/sigset_t.h>
+#endif
+
+#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;
+# define __uid_t_defined
+# 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
-#if !defined(__sig_atomic_t_defined) && \
- (defined(_SIGNAL_H) || defined(__need_sig_atomic_t))
-/* An integral type that can be modified atomically, without the
- possibility of a signal arriving in the middle of the operation. */
-typedef __sig_atomic_t sig_atomic_t;
-#endif /* `sig_atomic_t' undefined and <signal.h> or need `sig_atomic_t'. */
-#undef __need_sig_atomic_t
+#ifdef __USE_MISC
+# include <bits/types/sigval_t.h>
+#endif
-#ifdef _SIGNAL_H
+#ifdef __USE_POSIX199309
+# include <bits/types/sigevent_t.h>
+# include <bits/sigevent-consts.h>
+#endif
-#include <signum.h>
/* Type of a signal handler. */
-typedef void (*__sighandler_t) __P ((int));
+typedef void (*__sighandler_t) (int);
+
+/* 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
+
+/* 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. */
+#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_NTH
+extern __sighandler_t __REDIRECT_NTH (signal,
+ (int __sig, __sighandler_t __handler),
+ __sysv_signal);
+# else
+# define signal __sysv_signal
+# endif
+#endif
-/* Set the handler for the signal SIG to HANDLER,
- returning the old handler, or SIG_ERR on error. */
-extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler));
+#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;
+#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. */
-extern int __kill __P ((__pid_t __pid, int __sig));
-#ifdef __USE_POSIX
-extern int kill __P ((__pid_t __pid, int __sig));
+#ifdef __USE_POSIX
+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 __P ((__pid_t __pgrp, int __sig));
-#endif /* Use BSD || X/Open Unix. */
+extern int killpg (__pid_t __pgrp, int __sig) __THROW;
+#endif /* Use misc || X/Open Unix. */
/* Raise signal SIG, i.e., send SIG to yourself. */
-extern int raise __P ((int __sig));
+extern int raise (int __sig) __THROW;
-#ifdef __USE_SVID
+#ifdef __USE_MISC
/* SVID names for the same things. */
-extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler));
-extern int gsignal __P ((int __sig));
-#endif /* Use SVID. */
+extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
+ __THROW;
+extern int gsignal (int __sig) __THROW;
+#endif /* Use misc. */
-#ifdef __USE_MISC
+#ifdef __USE_XOPEN2K8
/* Print a message describing the meaning of the given signal number. */
-extern void psignal __P ((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. */
-/* Block signals in MASK, returning the old mask. */
-extern int __sigblock __P ((int __mask));
-/* Set the mask of blocked signals to MASK, returning the old mask. */
-extern int __sigsetmask __P ((int __mask));
+/* 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.
-/* 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 more modern version unless the user
- explitcly selects the BSD version. */
-extern int __sigpause __P ((int __sig_or_mask, int __is_sig));
+ This function is a cancellation point and therefore not marked with
+ __THROW. */
-#if defined(__USE_BSD) && !defined(__USE_XOPEN)
-/* Set the mask of blocked signals to MASK,
- wait for a signal to arrive, and then restore the mask. */
-#define sigpause(mask) __sigpause ((mask), 0)
-#else
-#ifdef __USE_XOPEN
+#ifdef __USE_XOPEN_EXTENDED
+# ifdef __GNUC__
+extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");
+# 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
-#define sigmask(sig) __sigmask(sig)
+#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. */
-extern int sigblock __P ((int __mask));
-extern int sigsetmask __P ((int __mask));
+/* Compute mask for signal SIG. */
+# define sigmask(sig) ((int)(1u << ((sig) - 1)))
-/* This function is here only for compatibility.
- Use `sigprocmask' instead. */
-extern int siggetmask __P ((void));
-#endif /* Use BSD. */
+/* 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 misc. */
-#ifdef __USE_MISC
-#define NSIG _NSIG
+
+#ifdef __USE_MISC
+# define NSIG _NSIG
#endif
-#ifdef __USE_GNU
+#ifdef __USE_GNU
typedef __sighandler_t sighandler_t;
#endif
/* 4.4 BSD uses the name `sig_t' for this. */
-#ifdef __USE_BSD
+#ifdef __USE_MISC
typedef __sighandler_t sig_t;
#endif
-#endif /* <signal.h> included. */
-
-
-#ifdef __USE_POSIX
-
-#if !defined(__sigset_t_defined) && \
- (defined(_SIGNAL_H) || defined(__need_sigset_t))
-typedef __sigset_t sigset_t;
-#define __sigset_t_defined 1
-#endif /* `sigset_t' not defined and <signal.h> or need `sigset_t'. */
-#undef __need_sigset_t
-
-#ifdef _SIGNAL_H
+#ifdef __USE_POSIX
/* Clear all signals from SET. */
-extern int sigemptyset __P ((sigset_t *__set));
+extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
/* Set all signals in SET. */
-extern int sigfillset __P ((sigset_t *__set));
+extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
/* Add SIGNO to SET. */
-extern int sigaddset __P ((sigset_t *__set, int __signo));
+extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
/* Remove SIGNO from SET. */
-extern int sigdelset __P ((sigset_t *__set, int __signo));
+extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
/* Return 1 if SIGNO is in SET, 0 if not. */
-extern int sigismember __P ((__const sigset_t *__set, int __signo));
+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 __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 <sigaction.h>
+# include <bits/sigaction.h>
/* Get and/or change the set of blocked signals. */
-extern int __sigprocmask __P ((int __how,
- __const sigset_t *__set, sigset_t *__oset));
-extern int sigprocmask __P ((int __how,
- __const sigset_t *__set, sigset_t *__oset));
+extern int sigprocmask (int __how, const sigset_t *__restrict __set,
+ sigset_t *__restrict __oset) __THROW;
/* Change the set of blocked signals to SET,
- wait until a signal arrives, and restore the set of blocked signals. */
-extern int __sigsuspend __P ((__const sigset_t *__set));
-extern int sigsuspend __P ((__const sigset_t *__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));
/* Get and/or set the action for signal SIG. */
-extern int __sigaction __P ((int __sig, __const struct sigaction *__act,
- struct sigaction *__oact));
-extern int sigaction __P ((int __sig, __const struct sigaction *__act,
- struct sigaction *__oact));
+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 __P ((sigset_t *__set));
+extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
-/* Select any of pending signals from SET or wait for any to arrive. */
-extern int __sigwait __P ((__const sigset_t *__set, int *__sig));
-extern int sigwait __P ((__const sigset_t *__set, int *__sig));
+# ifdef __USE_POSIX199506
+/* Select any of pending signals from SET or wait for any to arrive.
-#endif /* <signal.h> included. */
+ 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));
+# endif /* Use POSIX 1995. */
-#endif /* Use POSIX. */
+# ifdef __USE_POSIX199309
+/* Select any of pending signals from SET and place information in INFO.
-#if defined(_SIGNAL_H) && defined(__USE_BSD)
+ 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));
-/* 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];
+/* Select any of pending signals from SET and place information in INFO.
+ Wait the time specified by TIMEOUT if no signal is pending.
-/* Structure passed to `sigvec'. */
-struct sigvec
- {
- __sighandler_t sv_handler; /* Signal handler. */
- int sv_mask; /* Mask of signals to be blocked. */
+ 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));
- int sv_flags; /* Flags (see below). */
-#define sv_onstack sv_flags /* 4.2 BSD compatibility. */
- };
+/* 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. */
-/* 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 /* Use POSIX. */
+#ifdef __USE_MISC
-/* 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 __P ((int __sig, __const struct sigvec *__vec,
- struct sigvec *__ovec));
-extern int sigvec __P ((int __sig, __const struct sigvec *__vec,
- struct sigvec *__ovec));
+/* 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];
/* Get machine-dependent `struct sigcontext' and signal subcodes. */
-#include <sigcontext.h>
+# include <bits/sigcontext.h>
/* Restore the state saved in SCP. */
-extern int __sigreturn __P ((struct sigcontext *__scp));
-extern int sigreturn __P ((struct sigcontext *__scp));
+extern int sigreturn (struct sigcontext *__scp) __THROW;
-#endif /* signal.h included and use BSD. */
+#endif /* Use misc. */
-#if defined(_SIGNAL_H) && (defined(__USE_BSD) || defined(__USE_XOPEN_EXTENDED))
+#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
+# define __need_size_t
+# include <stddef.h>
-#define __need_size_t
-#include <stddef.h>
+# 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 __P ((int __sig, int __interrupt));
+extern int siginterrupt (int __sig, int __interrupt) __THROW;
+# include <bits/sigstack.h>
+# include <bits/ss_flags.h>
-/* Structure describing a signal stack. */
-struct sigstack
- {
- __ptr_t ss_sp; /* Signal stack pointer. */
- int ss_onstack; /* Nonzero if executing on this stack. */
- };
+/* Alternate signal handler stack interface.
+ This interface should always be preferred over `sigstack'. */
+extern int sigaltstack (const stack_t *__restrict __ss,
+ stack_t *__restrict __oss) __THROW;
+#endif /* __USE_XOPEN_EXTENDED || __USE_MISC */
+
+#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. */
-extern int sigstack __P ((__const struct sigstack *__ss,
- struct sigstack *__oss));
+ 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. */
+
+/* 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 __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 /* use Unix98 */
+
+/* The following functions are used internally in the C library and in
+ other code which need deep insights. */
-/* Alternate interface. */
-struct sigaltstack
- {
- __ptr_t ss_sp;
- size_t ss_size;
- int ss_flags;
- };
+/* 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;
-extern int sigaltstack __P ((__const struct sigaltstack *__ss,
- struct sigaltstack *__oss));
+#define SIGRTMIN (__libc_current_sigrtmin ())
+#define SIGRTMAX (__libc_current_sigrtmax ())
-#endif /* signal.h included and use BSD or X/Open Unix. */
+/* System-specific extensions. */
+#include <bits/signal_ext.h>
__END_DECLS
-#endif /* signal.h */
+#endif /* not signal.h */
projects / thirdparty / glibc.git / blobdiff