diff options
Diffstat (limited to 'include/signal.h')
| -rw-r--r-- | include/signal.h | 426 |
1 files changed, 309 insertions, 117 deletions
diff --git a/include/signal.h b/include/signal.h index 9daf0c07c..03a4e096e 100644 --- a/include/signal.h +++ b/include/signal.h @@ -1,166 +1,358 @@ -/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc. -This file is part of the GNU C Library. +/* Copyright (C) 1991-1999, 2000 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 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. + 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, 1992 Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ + 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. */ /* - * ANSI Standard: 4.7 SIGNAL HANDLING <signal.h> + * ISO C Standard: 4.7 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 +__BEGIN_DECLS + +//#include <asm/signal.h> +#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. */ +typedef __sig_atomic_t sig_atomic_t; + +typedef __sigset_t sigset_t; + +#ifdef _SIGNAL_H + +//#include <bits/types.h> +#include <bits/signum.h> + +#ifdef __USE_XOPEN +# ifndef pid_t +typedef __pid_t pid_t; +# define pid_t pid_t +# endif +# ifndef uid_t +typedef __uid_t uid_t; +# define uid_t uid_t +# endif +#endif /* Unix98 */ + + +/* Type of a signal handler. */ +typedef void (*__sighandler_t) __P ((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 __P ((int __sig, + __sighandler_t __handler)); +#ifdef __USE_GNU +extern __sighandler_t sysv_signal __P ((int __sig, __sighandler_t __handler)); #endif -/* SVR4 */ -#ifndef SA_RESETHAND -#define SA_RESETHAND SA_ONESHOT +/* 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_BSD +extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler)); +#else +/* Make sure the used `signal' implementation is the SVID version. */ +# ifdef __REDIRECT +extern __sighandler_t __REDIRECT (signal, + __P ((int __sig, __sighandler_t __handler)), + __sysv_signal); +# else +# define signal __sysv_signal +# endif #endif -/* SVR4 */ -#ifndef SA_NODEFER -#define SA_NODEFER SA_NOMASK +#ifdef __USE_XOPEN +/* The X/Open definition of `signal' conflicts with the BSD version. + So they defined another function `bsd_signal'. */ +extern __sighandler_t bsd_signal __P ((int __sig, __sighandler_t __handler)); #endif -typedef int sig_atomic_t; +/* 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 __P ((__pid_t __pid, int __sig)); +#endif /* Use POSIX. */ -typedef __sighandler_t SignalHandler; +#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 __P ((__pid_t __pgrp, int __sig)); +#endif /* Use BSD || X/Open Unix. */ -#ifndef BADSIG -#define BADSIG SIG_ERR -#endif +/* Raise signal SIG, i.e., send SIG to yourself. */ +extern int raise __P ((int __sig)); -/* The Interviews version also has these ... */ +#ifdef __USE_SVID +/* 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. */ -#define SignalBad ((SignalHandler)-1) -#define SignalDefault ((SignalHandler)0) -#define SignalIgnore ((SignalHandler)1) +#ifdef __USE_MISC +/* Print a message describing the meaning of the given signal number. */ +extern void psignal __P ((int __sig, __const char *__s)); +#endif /* Use misc. */ -__BEGIN_DECLS -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)); +/* 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. */ +extern int __sigpause __P ((int __sig_or_mask, int __is_sig)); -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)); +#ifdef __USE_BSD +/* Set the mask of blocked signals to MASK, + wait for a signal to arrive, and then restore the mask. */ +extern int sigpause __P ((int __mask)); +# define sigpause(mask) __sigpause ((mask), 0) +#else +# ifdef __USE_XOPEN +/* Remove a signal from the signal mask and suspend the process. */ +# define sigpause(sig) __sigpause ((sig), 1) +# endif +#endif -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)); +#ifdef __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. */ -#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) +/* Compute mask for signal SIG. */ +# define sigmask(sig) __sigmask(sig) +/* Block signals in MASK, returning the old mask. */ +extern int sigblock __P ((int __mask)); -#if 1 -#define sigemptyset __sigemptyset -#define sigfillset __sigfillset +/* Set the mask of blocked signals to MASK, returning the old mask. */ +extern int sigsetmask __P ((int __mask)); -/* 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 +/* Return currently selected signal mask. */ +extern int siggetmask __P ((void)); +#endif /* Use BSD. */ + + +#ifdef __USE_MISC +# define NSIG _NSIG +#endif + +#ifdef __USE_GNU +typedef __sighandler_t sighandler_t; #endif +/* 4.4 BSD uses the name `sig_t' for this. */ +#ifdef __USE_BSD +typedef __sighandler_t sig_t; #endif +#ifdef __USE_POSIX -/* Return a mask that includes SIG only. */ -#define __sigmask(sig) (1 << ((sig) - 1)) +# ifdef __USE_POSIX199309 +/* We need `struct timespec' later on. */ +# define __need_timespec +# include <time.h> -extern int __sigsetmask __P ((int __mask)); -extern int __siggetmask __P ((void)); -extern int __sigblock __P ((int __mask)); -extern int __sigpause __P ((int __mask)); +/* Get the `siginfo_t' type plus the needed symbols. */ +# include <bits/siginfo.h> +# endif -#ifdef __USE_SVID -/* SVID names for the same things. */ -extern __sighandler_t ssignal __P ((int __sig, __sighandler_t __handler)); -extern int gsignal __P ((int __sig)); +/* Clear all signals from SET. */ +extern int sigemptyset __P ((sigset_t *__set)); + +/* Set all signals in SET. */ +extern int sigfillset __P ((sigset_t *__set)); + +/* Add SIGNO to SET. */ +extern int sigaddset __P ((sigset_t *__set, int __signo)); + +/* Remove SIGNO from SET. */ +extern int sigdelset __P ((sigset_t *__set, int __signo)); + +/* Return 1 if SIGNO is in SET, 0 if not. */ +extern int sigismember __P ((__const sigset_t *__set, int __signo)); + +# ifdef __USE_GNU +/* Return non-empty value is SET is not empty. */ +extern int sigisemptyset __P ((__const sigset_t *__set)); + +/* Build new signal set by combining the two inputs set using logical AND. */ +extern int sigandset __P ((sigset_t *__set, __const sigset_t *__left, + __const sigset_t *__right)); + +/* Build new signal set by combining the two inputs set using logical OR. */ +extern int sigorset __P ((sigset_t *__set, __const sigset_t *__left, + __const sigset_t *__right)); +# 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 __P ((int __how, + __const sigset_t *__set, sigset_t *__oset)); + +/* 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)); + +/* 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)); + +/* Put in SET all signals that are blocked and waiting to be delivered. */ +extern int sigpending __P ((sigset_t *__set)); + + +/* Select any of pending signals from SET or wait for any to arrive. */ +extern int sigwait __P ((__const sigset_t *__set, int *__sig)); + +# ifdef __USE_POSIX199309 +/* Select any of pending signals from SET and place information in INFO. */ +extern int sigwaitinfo __P ((__const sigset_t *__set, siginfo_t *__info)); + +/* Select any of pending signals from SET and place information in INFO. + Wait the imte specified by TIMEOUT if no signal is pending. */ +extern int sigtimedwait __P ((__const sigset_t *__set, siginfo_t *__info, + __const struct timespec *__timeout)); + +/* Send signal SIG to the process PID. Associate data in VAL with the + signal. */ +extern int sigqueue __P ((__pid_t __pid, int __sig, + __const union sigval __val)); +# endif /* Use POSIX 199306. */ + +#endif /* Use POSIX. */ -#endif /* Use SVID. */ - -/* BSD */ #ifdef __USE_BSD -#define sigmask __sigmask -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)); +/* 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]; -extern int siginterrupt __P ((int __sig, int __flag)); +/* Structure passed to `sigvec'. */ +struct sigvec + { + __sighandler_t sv_handler; /* Signal handler. */ + int sv_mask; /* Mask of signals to be blocked. */ -/* The `sig' bit is set if the interrupt on it - * is enabled via siginterrupt (). */ -extern sigset_t _sigintr; + int sv_flags; /* Flags (see below). */ +# define sv_onstack sv_flags /* 4.2 BSD compatibility. */ + }; -#endif /* Use BSD. */ +/* 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. */ -#ifdef __USE_BSD_SIGNAL -extern __sighandler_t - __bsd_signal __P ((int __sig, __sighandler_t)); -#define signal __bsd_signal +/* 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)); -#endif /* __USE_BSD_SIGNAL */ -__END_DECLS +/* Get machine-dependent `struct sigcontext' and signal subcodes. */ +# include <bits/sigcontext.h> -#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))) -#endif +/* Restore the state saved in SCP. */ +extern int sigreturn __P ((struct sigcontext *__scp)); + +#endif /* use BSD. */ + + +#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED + +/* 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)); + +# include <bits/sigstack.h> +# ifdef __USE_GNU +# include <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 __P ((struct sigstack *__ss, struct sigstack *__oss)); + +/* Alternate signal handler stack interface. + This interface should always be preferred over `sigstack'. */ +extern int sigaltstack __P ((__const struct sigaltstack *__ss, + struct sigaltstack *__oss)); + +#endif /* use BSD or X/Open Unix. */ + +#ifdef __USE_UNIX98 +/* Simplified interface for signal management. */ + +/* Add SIG to the calling process' signal mask. */ +extern int sighold __P ((int __sig)); + +/* Remove SIG from the calling process' signal mask. */ +extern int sigrelse __P ((int __sig)); + +/* Set the disposition of SIG to SIG_IGN. */ +extern int sigignore __P ((int __sig)); + +/* Set the disposition of SIG. */ +extern __sighandler_t sigset __P ((int __sig, __sighandler_t __disp)); + +/* Some of the functions for handling signals in threaded programs must + be defined here. */ +# 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. */ + +/* Return number of available real-time signal with highest priority. */ +extern int __libc_current_sigrtmin __P ((void)); +/* Return number of available real-time signal with lowest priority. */ +extern int __libc_current_sigrtmax __P ((void)); + +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)); +#endif /* signal.h */ + +__END_DECLS -#endif /* _SIGNAL_H */ +#endif /* not signal.h */ |