/* * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * Copyright (c) 1982, 1986, 1989, 1991, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)signal.h 8.2 (Berkeley) 1/21/94 */ #ifndef _SYS_SIGNAL_H_ #define _SYS_SIGNAL_H_ #include <sys/cdefs.h> #include <sys/appleapiopts.h> #define __DARWIN_NSIG 32 /* counting 0; could be 33 (mask is 1-32) */ #if !defined(_ANSI_SOURCE) && (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)) #define NSIG __DARWIN_NSIG #endif #include <machine/signal.h> /* sigcontext; codes for SIGILL, SIGFPE */ #define SIGHUP 1 /* hangup */ #define SIGINT 2 /* interrupt */ #define SIGQUIT 3 /* quit */ #define SIGILL 4 /* illegal instruction (not reset when caught) */ #define SIGTRAP 5 /* trace trap (not reset when caught) */ #define SIGABRT 6 /* abort() */ #if (defined(_POSIX_C_SOURCE) && !defined(_DARWIN_C_SOURCE)) #define SIGPOLL 7 /* pollable event ([XSR] generated, not supported) */ #else /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ #define SIGIOT SIGABRT /* compatibility */ #define SIGEMT 7 /* EMT instruction */ #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ #define SIGFPE 8 /* floating point exception */ #define SIGKILL 9 /* kill (cannot be caught or ignored) */ #define SIGBUS 10 /* bus error */ #define SIGSEGV 11 /* segmentation violation */ #define SIGSYS 12 /* bad argument to system call */ #define SIGPIPE 13 /* write on a pipe with no one to read it */ #define SIGALRM 14 /* alarm clock */ #define SIGTERM 15 /* software termination signal from kill */ #define SIGURG 16 /* urgent condition on IO channel */ #define SIGSTOP 17 /* sendable stop signal not from tty */ #define SIGTSTP 18 /* stop signal from tty */ #define SIGCONT 19 /* continue a stopped process */ #define SIGCHLD 20 /* to parent on child stop or exit */ #define SIGTTIN 21 /* to readers pgrp upon background tty read */ #define SIGTTOU 22 /* like TTIN for output if (tp->t_local<OSTOP) */ #if (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)) #define SIGIO 23 /* input/output possible signal */ #endif #define SIGXCPU 24 /* exceeded CPU time limit */ #define SIGXFSZ 25 /* exceeded file size limit */ #define SIGVTALRM 26 /* virtual time alarm */ #define SIGPROF 27 /* profiling time alarm */ #if (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)) #define SIGWINCH 28 /* window size changes */ #define SIGINFO 29 /* information request */ #endif #define SIGUSR1 30 /* user defined signal 1 */ #define SIGUSR2 31 /* user defined signal 2 */ #if defined(_ANSI_SOURCE) || __DARWIN_UNIX03 || defined(__cplusplus) /* * Language spec sez we must list exactly one parameter, even though we * actually supply three. Ugh! * SIG_HOLD is chosen to avoid KERN_SIG_* values in <sys/signalvar.h> */ #define SIG_DFL (void (*)(int))0 #define SIG_IGN (void (*)(int))1 #define SIG_HOLD (void (*)(int))5 #define SIG_ERR ((void (*)(int))-1) #else /* DO NOT REMOVE THE COMMENTED OUT int: fixincludes needs to see them */ #define SIG_DFL (void (*)(/*int*/))0 #define SIG_IGN (void (*)(/*int*/))1 #define SIG_HOLD (void (*)(/*int*/))5 #define SIG_ERR ((void (*)(/*int*/))-1) #endif #ifndef _ANSI_SOURCE #include <sys/_types.h> #define __need_mcontext_t #define __need_stack_t #define __need_ucontext_t #include <sys/_structs.h> #ifndef _PID_T #define _PID_T typedef __darwin_pid_t pid_t; #endif #ifndef _PTHREAD_ATTR_T #define _PTHREAD_ATTR_T typedef __darwin_pthread_attr_t pthread_attr_t; #endif #ifndef _SIGSET_T #define _SIGSET_T typedef __darwin_sigset_t sigset_t; #endif #ifndef _SIZE_T #define _SIZE_T typedef __darwin_size_t size_t; #endif #ifndef _UID_T #define _UID_T typedef __darwin_uid_t uid_t; #endif union sigval { /* Members as suggested by Annex C of POSIX 1003.1b. */ int sival_int; void *sival_ptr; }; #define SIGEV_NONE 0 /* No async notification */ #define SIGEV_SIGNAL 1 /* aio - completion notification */ #define SIGEV_THREAD 3 /* [NOTIMP] [RTS] call notification function */ struct sigevent { int sigev_notify; /* Notification type */ int sigev_signo; /* Signal number */ union sigval sigev_value; /* Signal value */ void (*sigev_notify_function)(union sigval); /* Notification function */ pthread_attr_t *sigev_notify_attributes; /* Notification attributes */ }; #ifdef BSD_KERNEL_PRIVATE union user64_sigval { struct { uint32_t pad; /* assumes Motorola byte order */ int32_t sival_int; } size_equivalent; user64_addr_t sival_ptr; }; union user32_sigval { /* Members as suggested by Annex C of POSIX 1003.1b. */ int32_t sival_int; user32_addr_t sival_ptr; }; union user_sigval { struct { uint32_t pad; /* assumes Motorola byte order */ int32_t sival_int; } size_equivalent; user_addr_t sival_ptr; }; struct user64_sigevent { int sigev_notify; /* Notification type */ int sigev_signo; /* Signal number */ union user64_sigval sigev_value; /* Signal value */ user64_addr_t sigev_notify_function; /* Notify function */ user64_addr_t sigev_notify_attributes; /* Notify attributes */ }; struct user32_sigevent { int sigev_notify; /* Notification type */ int sigev_signo; /* Signal number */ union user32_sigval sigev_value; /* Signal value */ user32_addr_t sigev_notify_function; /* Notify function */ user32_addr_t sigev_notify_attributes; /* Notify attributes */ }; struct user_sigevent { int sigev_notify; /* Notification type */ int sigev_signo; /* Signal number */ union user_sigval sigev_value; /* Signal value */ user_addr_t sigev_notify_function; /* Notify function */ user_addr_t sigev_notify_attributes; /* Notify attributes */ }; #endif /* BSD_KERNEL_PRIVATE */ typedef struct __siginfo { int si_signo; /* signal number */ int si_errno; /* errno association */ int si_code; /* signal code */ pid_t si_pid; /* sending process */ uid_t si_uid; /* sender's ruid */ int si_status; /* exit value */ void *si_addr; /* faulting instruction */ union sigval si_value; /* signal value */ long si_band; /* band event for SIGPOLL */ unsigned long __pad[7]; /* Reserved for Future Use */ } siginfo_t; #ifdef BSD_KERNEL_PRIVATE typedef struct user_siginfo { int si_signo; /* signal number */ int si_errno; /* errno association */ int si_code; /* signal code */ pid_t si_pid; /* sending process */ uid_t si_uid; /* sender's ruid */ int si_status; /* exit value */ user_addr_t si_addr; /* faulting instruction (see below) */ union user_sigval si_value; /* signal value */ user_long_t si_band; /* band event for SIGPOLL */ user_ulong_t pad[7]; /* Reserved for Future Use */ } user_siginfo_t; typedef struct user64_siginfo { int si_signo; /* signal number */ int si_errno; /* errno association */ int si_code; /* signal code */ pid_t si_pid; /* sending process */ uid_t si_uid; /* sender's ruid */ int si_status; /* exit value */ user64_addr_t si_addr; /* faulting instruction (see below) */ union user64_sigval si_value; /* signal value */ user64_long_t si_band; /* band event for SIGPOLL */ user64_ulong_t __pad[7]; /* Reserved for Future Use */ } user64_siginfo_t; typedef struct user32_siginfo { int si_signo; /* signal number */ int si_errno; /* errno association */ int si_code; /* signal code */ pid_t si_pid; /* sending process */ uid_t si_uid; /* sender's ruid */ int si_status; /* exit value */ user32_addr_t si_addr; /* faulting instruction (see below) */ union user32_sigval si_value; /* signal value */ user32_long_t si_band; /* band event for SIGPOLL */ user32_ulong_t __pad[7]; /* Reserved for Future Use */ } user32_siginfo_t; void siginfo_user_to_user32(user_siginfo_t *, user32_siginfo_t *); void siginfo_user_to_user64(user_siginfo_t *, user64_siginfo_t *); #endif /* BSD_KERNEL_PRIVATE */ /* * When the signal is SIGILL or SIGFPE, si_addr contains the address of * the faulting instruction. * When the signal is SIGSEGV or SIGBUS, si_addr contains the address of * the faulting memory reference. Although for x86 there are cases of SIGSEGV * for which si_addr cannot be determined and is NULL. * If the signal is SIGCHLD, the si_pid field will contain the child process ID, * si_status contains the exit value or signal and * si_uid contains the real user ID of the process that sent the signal. */ /* Values for si_code */ /* Codes for SIGILL */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) #define ILL_NOOP 0 /* if only I knew... */ #endif #define ILL_ILLOPC 1 /* [XSI] illegal opcode */ #define ILL_ILLTRP 2 /* [XSI] illegal trap */ #define ILL_PRVOPC 3 /* [XSI] privileged opcode */ #define ILL_ILLOPN 4 /* [XSI] illegal operand -NOTIMP */ #define ILL_ILLADR 5 /* [XSI] illegal addressing mode -NOTIMP */ #define ILL_PRVREG 6 /* [XSI] privileged register -NOTIMP */ #define ILL_COPROC 7 /* [XSI] coprocessor error -NOTIMP */ #define ILL_BADSTK 8 /* [XSI] internal stack error -NOTIMP */ /* Codes for SIGFPE */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) #define FPE_NOOP 0 /* if only I knew... */ #endif #define FPE_FLTDIV 1 /* [XSI] floating point divide by zero */ #define FPE_FLTOVF 2 /* [XSI] floating point overflow */ #define FPE_FLTUND 3 /* [XSI] floating point underflow */ #define FPE_FLTRES 4 /* [XSI] floating point inexact result */ #define FPE_FLTINV 5 /* [XSI] invalid floating point operation */ #define FPE_FLTSUB 6 /* [XSI] subscript out of range -NOTIMP */ #define FPE_INTDIV 7 /* [XSI] integer divide by zero */ #define FPE_INTOVF 8 /* [XSI] integer overflow */ /* Codes for SIGSEGV */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) #define SEGV_NOOP 0 /* if only I knew... */ #endif #define SEGV_MAPERR 1 /* [XSI] address not mapped to object */ #define SEGV_ACCERR 2 /* [XSI] invalid permission for mapped object */ /* Codes for SIGBUS */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) #define BUS_NOOP 0 /* if only I knew... */ #endif #define BUS_ADRALN 1 /* [XSI] Invalid address alignment */ #define BUS_ADRERR 2 /* [XSI] Nonexistent physical address -NOTIMP */ #define BUS_OBJERR 3 /* [XSI] Object-specific HW error - NOTIMP */ /* Codes for SIGTRAP */ #define TRAP_BRKPT 1 /* [XSI] Process breakpoint -NOTIMP */ #define TRAP_TRACE 2 /* [XSI] Process trace trap -NOTIMP */ /* Codes for SIGCHLD */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) #define CLD_NOOP 0 /* if only I knew... */ #endif #define CLD_EXITED 1 /* [XSI] child has exited */ #define CLD_KILLED 2 /* [XSI] terminated abnormally, no core file */ #define CLD_DUMPED 3 /* [XSI] terminated abnormally, core file */ #define CLD_TRAPPED 4 /* [XSI] traced child has trapped */ #define CLD_STOPPED 5 /* [XSI] child has stopped */ #define CLD_CONTINUED 6 /* [XSI] stopped child has continued */ /* Codes for SIGPOLL */ #define POLL_IN 1 /* [XSR] Data input available */ #define POLL_OUT 2 /* [XSR] Output buffers available */ #define POLL_MSG 3 /* [XSR] Input message available */ #define POLL_ERR 4 /* [XSR] I/O error */ #define POLL_PRI 5 /* [XSR] High priority input available */ #define POLL_HUP 6 /* [XSR] Device disconnected */ /* union for signal handlers */ union __sigaction_u { void (*__sa_handler)(int); void (*__sa_sigaction)(int, struct __siginfo *, void *); }; /* Signal vector template for Kernel user boundary */ struct __sigaction { union __sigaction_u __sigaction_u; /* signal handler */ void (*sa_tramp)(void *, int, int, siginfo_t *, void *); sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; /* * Signal vector "template" used in sigaction call. */ struct sigaction { union __sigaction_u __sigaction_u; /* signal handler */ sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; #ifdef BSD_KERNEL_PRIVATE #include <machine/types.h> union __user32_sigaction_u { user32_addr_t __sa_handler; user32_addr_t __sa_sigaction; }; struct user32_sigaction { union __user32_sigaction_u __sigaction_u; /* signal handler */ sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; struct __user32_sigaction { union __user32_sigaction_u __sigaction_u; /* signal handler */ user32_addr_t sa_tramp; sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; union __user64_sigaction_u { user64_addr_t __sa_handler; user64_addr_t __sa_sigaction; }; struct user64_sigaction { union __user64_sigaction_u __sigaction_u; /* signal handler */ sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; struct __user64_sigaction { union __user64_sigaction_u __sigaction_u; /* signal handler */ user64_addr_t sa_tramp; /* signal mask to apply */ sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; union __kern_sigaction_u { user_addr_t __sa_handler; user_addr_t __sa_sigaction; }; struct kern_sigaction { union __kern_sigaction_u __sigaction_u; /* signal handler */ sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; struct __kern_sigaction { union __kern_sigaction_u __sigaction_u; /* signal handler */ user_addr_t sa_tramp; /* signal mask to apply */ sigset_t sa_mask; /* signal mask to apply */ int sa_flags; /* see signal options below */ }; #undef SIG_DFL #undef SIG_IGN #undef SIG_ERR #define SIG_DFL ((user_addr_t)0LL) #define SIG_IGN ((user_addr_t)1LL) #define SIG_ERR ((user_addr_t)-1LL) #endif /* BSD_KERNEL_PRIVATE */ /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ #define sa_handler __sigaction_u.__sa_handler #define sa_sigaction __sigaction_u.__sa_sigaction #define SA_ONSTACK 0x0001 /* take signal on signal stack */ #define SA_RESTART 0x0002 /* restart system on signal return */ #ifdef BSD_KERNEL_PRIVATE #define SA_DISABLE 0x0004 /* disable taking signals on alternate stack - for user_sigaltstack.ss_flags only */ #endif /* BSD_KERNEL_PRIVATE */ #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ /* This will provide 64bit register set in a 32bit user address space */ #define SA_64REGSET 0x0200 /* signal handler with SA_SIGINFO args with 64bit regs information */ #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ /* the following are the only bits we support from user space, the * rest are for kernel use only. */ #define SA_USERSPACE_MASK (SA_ONSTACK | SA_RESTART | SA_RESETHAND | SA_NOCLDSTOP | SA_NODEFER | SA_NOCLDWAIT | SA_SIGINFO) /* * Flags for sigprocmask: */ #define SIG_BLOCK 1 /* block specified signal set */ #define SIG_UNBLOCK 2 /* unblock specified signal set */ #define SIG_SETMASK 3 /* set specified signal set */ /* POSIX 1003.1b required values. */ #define SI_USER 0x10001 /* [CX] signal from kill() */ #define SI_QUEUE 0x10002 /* [CX] signal from sigqueue() */ #define SI_TIMER 0x10003 /* [CX] timer expiration */ #define SI_ASYNCIO 0x10004 /* [CX] aio request completion */ #define SI_MESGQ 0x10005 /* [CX] from message arrival on empty queue */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) typedef void (*sig_t)(int); /* type of signal function */ #endif /* * Structure used in sigaltstack call. */ #ifdef BSD_KERNEL_PRIVATE struct user32_sigaltstack { user32_addr_t ss_sp; /* signal stack base */ user32_size_t ss_size; /* signal stack length */ int ss_flags; /* SA_DISABLE and/or SA_ONSTACK */ }; struct user64_sigaltstack { user64_addr_t ss_sp; /* signal stack base */ user64_size_t ss_size; /* signal stack length */ int ss_flags; /* SA_DISABLE and/or SA_ONSTACK */ }; struct kern_sigaltstack { user_addr_t ss_sp; /* signal stack base */ user_size_t ss_size; /* signal stack length */ int ss_flags; /* SA_DISABLE and/or SA_ONSTACK */ }; #endif /* BSD_KERNEL_PRIVATE */ #define SS_ONSTACK 0x0001 /* take signal on signal stack */ #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ #define MINSIGSTKSZ 32768 /* (32K)minimum allowable stack */ #define SIGSTKSZ 131072 /* (128K)recommended stack size */ #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) /* * 4.3 compatibility: * Signal vector "template" used in sigvec call. */ struct sigvec { void (*sv_handler)(int); /* signal handler */ int sv_mask; /* signal mask to apply */ int sv_flags; /* see signal options below */ }; #define SV_ONSTACK SA_ONSTACK #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ #define SV_RESETHAND SA_RESETHAND #define SV_NODEFER SA_NODEFER #define SV_NOCLDSTOP SA_NOCLDSTOP #define SV_SIGINFO SA_SIGINFO #define sv_onstack sv_flags /* isn't compatibility wonderful! */ #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ /* * Structure used in sigstack call. */ struct sigstack { char *ss_sp; /* signal stack pointer */ int ss_onstack; /* current status */ }; #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) /* * Macro for converting signal number to a mask suitable for * sigblock(). */ #define sigmask(m) (1 << ((m)-1)) #ifdef BSD_KERNEL_PRIVATE /* * signals delivered on a per-thread basis. */ #define threadmask (sigmask(SIGILL)|sigmask(SIGTRAP)|\ sigmask(SIGIOT)|sigmask(SIGEMT)|\ sigmask(SIGFPE)|sigmask(SIGBUS)|\ sigmask(SIGSEGV)|sigmask(SIGSYS)|\ sigmask(SIGPIPE)) #define workq_threadmask (threadmask | sigcantmask) /* * Signals carried across exec. */ #define execmask (sigmask(SIGHUP)|sigmask(SIGINT)|\ sigmask(SIGQUIT)|sigmask(SIGKILL)|\ sigmask(SIGTERM)|sigmask(SIGSTOP)|\ sigmask(SIGTSTP)|sigmask(SIGCONT)|\ sigmask(SIGTTIN)|sigmask(SIGTTOU)|\ sigmask(SIGUSR1)|sigmask(SIGUSR2)) #endif /* BSD_KERNEL_PRIVATE */ #define BADSIG SIG_ERR #endif /* (!_POSIX_C_SOURCE || _DARWIN_C_SOURCE) */ #endif /* !_ANSI_SOURCE */ /* * For historical reasons; programs expect signal's return value to be * defined by <sys/signal.h>. */ __BEGIN_DECLS void (*signal(int, void (*)(int)))(int); __END_DECLS #endif /* !_SYS_SIGNAL_H_ */