/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 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. */ /* * ISO C Standard: 4.7 SIGNAL HANDLING */ #ifndef _SIGNAL_H #if !defined __need_sig_atomic_t && !defined __need_sigset_t #define _SIGNAL_H 1 #include #endif __BEGIN_DECLS #include #include /* __sigset_t, __sig_atomic_t. */ #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 or need `sig_atomic_t'. */ #undef __need_sig_atomic_t #ifdef _SIGNAL_H #include /* Type of a signal handler. */ typedef void (*__sighandler_t) __P ((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. */ extern __sighandler_t signal __P ((int __sig, __sighandler_t __handler)); /* 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)); #if defined __USE_XOPEN && !defined __USE_GNU extern __sighandler_t sysv_signal __P ((int __sig, __sighandler_t __handler)); /* Make sure the used `signal' implementation is the SVID version. */ #define signal(sig, handler) __sysv_signal ((sig), (handler)) #endif #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)); extern __sighandler_t bsd_signal __P ((int __sig, __sighandler_t __handler)); #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)); #endif /* Use POSIX. */ #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. */ /* Raise signal SIG, i.e., send SIG to yourself. */ extern int raise __P ((int __sig)); #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. */ #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. */ /* 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 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)); #if defined __USE_BSD || defined __USE_GNU /* 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 #ifdef __USE_BSD #define sigmask(sig) __sigmask(sig) extern int sigblock __P ((int __mask)); extern int sigsetmask __P ((int __mask)); /* This function is here only for compatibility. Use `sigprocmask' instead. */ 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 #endif /* 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 or need `sigset_t'. */ #undef __need_sigset_t #ifdef _SIGNAL_H /* 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)); /* Get the system-specific definitions of `struct sigaction' and the `SA_*' and `SIG_*'. constants. */ #include /* 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)); /* 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)); /* 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)); extern int sigwait __P ((__const sigset_t *__set, int *__sig)); #endif /* included. */ #endif /* Use POSIX. */ #if defined _SIGNAL_H && defined __USE_BSD /* Names of the signals. This variable exists only for compatibility. Use `strsignal' instead (see ). */ 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 __P ((int __sig, __const struct sigvec *__vec, struct sigvec *__ovec)); extern int sigvec __P ((int __sig, __const struct sigvec *__vec, struct sigvec *__ovec)); /* Get machine-dependent `struct sigcontext' and signal subcodes. */ #include /* Restore the state saved in SCP. */ extern int __sigreturn __P ((struct sigcontext *__scp)); extern int sigreturn __P ((struct sigcontext *__scp)); #endif /* signal.h included and use BSD. */ #if defined _SIGNAL_H && (defined __USE_BSD || defined __USE_XOPEN_EXTENDED) #define __need_size_t #include /* 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)); /* Structure describing a signal stack. */ struct sigstack { __ptr_t ss_sp; /* Signal stack pointer. */ int ss_onstack; /* Nonzero if executing on this stack. */ }; /* 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)); /* Alternate interface. */ struct sigaltstack { __ptr_t ss_sp; size_t ss_size; int ss_flags; }; extern int sigaltstack __P ((__const struct sigaltstack *__ss, struct sigaltstack *__oss)); #endif /* signal.h included and use BSD or X/Open Unix. */ __END_DECLS #endif /* signal.h */