FreeBSD/Linux Kernel Cross Reference
sys/bsd/sys/signal.h

     /*
      * 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&LTOSTOP) */
   #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_ */

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