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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * 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. 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    8.4 (Berkeley) 5/4/95
     * $FreeBSD: releng/12.0/sys/sys/signal.h 326023 2017-11-20 19:43:44Z pfg $
     */
    
    #ifndef _SYS_SIGNAL_H_
    #define _SYS_SIGNAL_H_
    
    #include <sys/cdefs.h>
    #include <sys/_types.h>
    #include <sys/_sigset.h>
    
    #include <machine/_limits.h>    /* __MINSIGSTKSZ */
    #include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
    
    #if __POSIX_VISIBLE >= 200809
    
    #include <sys/_pthreadtypes.h>
    #include <sys/_timespec.h>
    
    #ifndef _SIZE_T_DECLARED
    typedef __size_t        size_t;
    #define _SIZE_T_DECLARED
    #endif
    
    #ifndef _UID_T_DECLARED
    typedef __uid_t         uid_t;
    #define _UID_T_DECLARED
    #endif
    
    #endif /* __POSIX_VISIBLE >= 200809 */
    
    /*
     * System defined signals.
     */
    #if __POSIX_VISIBLE || __XSI_VISIBLE
    #define SIGHUP          1       /* hangup */
    #endif
    #define SIGINT          2       /* interrupt */
    #if __POSIX_VISIBLE || __XSI_VISIBLE
    #define SIGQUIT         3       /* quit */
    #endif
    #define SIGILL          4       /* illegal instr. (not reset when caught) */
    #if __XSI_VISIBLE
    #define SIGTRAP         5       /* trace trap (not reset when caught) */
    #endif
    #define SIGABRT         6       /* abort() */
    #if __BSD_VISIBLE
    #define SIGIOT          SIGABRT /* compatibility */
    #define SIGEMT          7       /* EMT instruction */
    #endif
    #define SIGFPE          8       /* floating point exception */
    #if __POSIX_VISIBLE || __XSI_VISIBLE
    #define SIGKILL         9       /* kill (cannot be caught or ignored) */
    #endif
    #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
    #define SIGBUS          10      /* bus error */
    #endif
    #define SIGSEGV         11      /* segmentation violation */
    #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
    #define SIGSYS          12      /* non-existent system call invoked */
    #endif
    #if __POSIX_VISIBLE || __XSI_VISIBLE
    #define SIGPIPE         13      /* write on a pipe with no one to read it */
    #define SIGALRM         14      /* alarm clock */
   #endif
   #define SIGTERM         15      /* software termination signal from kill */
   #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
   #define SIGURG          16      /* urgent condition on IO channel */
   #endif
   #if __POSIX_VISIBLE || __XSI_VISIBLE
   #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 if (tp->t_local&LTOSTOP) */
   #endif
   #if __BSD_VISIBLE
   #define SIGIO           23      /* input/output possible signal */
   #endif
   #if __XSI_VISIBLE
   #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 */
   #endif
   #if __BSD_VISIBLE
   #define SIGWINCH        28      /* window size changes */
   #define SIGINFO         29      /* information request */
   #endif
   #if __POSIX_VISIBLE || __XSI_VISIBLE
   #define SIGUSR1         30      /* user defined signal 1 */
   #define SIGUSR2         31      /* user defined signal 2 */
   #endif
   #if __BSD_VISIBLE
   #define SIGTHR          32      /* reserved by thread library. */
   #define SIGLWP          SIGTHR
   #define SIGLIBRT        33      /* reserved by real-time library. */
   #endif
   
   #define SIGRTMIN        65
   #define SIGRTMAX        126
   
   #define SIG_DFL         ((__sighandler_t *)0)
   #define SIG_IGN         ((__sighandler_t *)1)
   #define SIG_ERR         ((__sighandler_t *)-1)
   /* #define      SIG_CATCH       ((__sighandler_t *)2) See signalvar.h */
   #define SIG_HOLD        ((__sighandler_t *)3)
   
   /*
    * Type of a signal handling function.
    *
    * Language spec sez signal handlers take exactly one arg, even though we
    * actually supply three.  Ugh!
    *
    * We don't try to hide the difference by leaving out the args because
    * that would cause warnings about conformant programs.  Nonconformant
    * programs can avoid the warnings by casting to (__sighandler_t *) or
    * sig_t before calling signal() or assigning to sa_handler or sv_handler.
    *
    * The kernel should reverse the cast before calling the function.  It
    * has no way to do this, but on most machines 1-arg and 3-arg functions
    * have the same calling protocol so there is no problem in practice.
    * A bit in sa_flags could be used to specify the number of args.
    */
   typedef void __sighandler_t(int);
   
   #if __POSIX_VISIBLE || __XSI_VISIBLE
   #ifndef _SIGSET_T_DECLARED
   #define _SIGSET_T_DECLARED
   typedef __sigset_t      sigset_t;
   #endif
   #endif
   
   #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
   union sigval {
           /* Members as suggested by Annex C of POSIX 1003.1b. */
           int     sival_int;
           void    *sival_ptr;
           /* 6.0 compatibility */
           int     sigval_int;
           void    *sigval_ptr;
   };
   
   #if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
   union sigval32 {
           int     sival_int;
           uint32_t sival_ptr;
           /* 6.0 compatibility */
           int     sigval_int;
           uint32_t sigval_ptr;
   };
   #endif
   #endif
   
   #if __POSIX_VISIBLE >= 199309
   
   struct pthread_attr;
   
   struct sigevent {
           int     sigev_notify;           /* Notification type */
           int     sigev_signo;            /* Signal number */
           union sigval sigev_value;       /* Signal value */
           union {
                   __lwpid_t       _threadid;
                   struct {
                           void (*_function)(union sigval);
                           struct pthread_attr **_attribute;
                   } _sigev_thread;
                   unsigned short _kevent_flags;
                   long __spare__[8];
           } _sigev_un;
   };
   
   #if __BSD_VISIBLE
   #define sigev_notify_kqueue             sigev_signo
   #define sigev_notify_kevent_flags       _sigev_un._kevent_flags
   #define sigev_notify_thread_id          _sigev_un._threadid
   #endif
   #define sigev_notify_function           _sigev_un._sigev_thread._function
   #define sigev_notify_attributes         _sigev_un._sigev_thread._attribute
   
   #define SIGEV_NONE      0               /* No async notification. */
   #define SIGEV_SIGNAL    1               /* Generate a queued signal. */
   #define SIGEV_THREAD    2               /* Call back from another pthread. */
   #if __BSD_VISIBLE
   #define SIGEV_KEVENT    3               /* Generate a kevent. */
   #define SIGEV_THREAD_ID 4               /* Send signal to a kernel thread. */
   #endif
   
   #endif /* __POSIX_VISIBLE >= 199309 */
   
   #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
   typedef struct __siginfo {
           int     si_signo;               /* signal number */
           int     si_errno;               /* errno association */
           /*
            * Cause of signal, one of the SI_ macros or signal-specific
            * values, i.e. one of the FPE_... values for SIGFPE.  This
            * value is equivalent to the second argument to an old-style
            * FreeBSD signal handler.
            */
           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 */
           union   {
                   struct {
                           int     _trapno;/* machine specific trap code */
                   } _fault;
                   struct {
                           int     _timerid;
                           int     _overrun;
                   } _timer;
                   struct {
                           int     _mqd;
                   } _mesgq;
                   struct {
                           long    _band;          /* band event for SIGPOLL */
                   } _poll;                        /* was this ever used ? */
                   struct {
                           long    __spare1__;
                           int     __spare2__[7];
                   } __spare__;
           } _reason;
   } siginfo_t;
   
   #define si_trapno       _reason._fault._trapno
   #define si_timerid      _reason._timer._timerid
   #define si_overrun      _reason._timer._overrun
   #define si_mqd          _reason._mesgq._mqd
   #define si_band         _reason._poll._band
   
   #if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
   struct siginfo32 {
           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 */
           uint32_t si_addr;               /* faulting instruction */
           union sigval32 si_value;        /* signal value */
           union   {
                   struct {
                           int     _trapno;/* machine specific trap code */
                   } _fault;
                   struct {
                           int     _timerid;
                           int     _overrun;
                   } _timer;
                   struct {
                           int     _mqd;
                   } _mesgq;
                   struct {
                           int32_t _band;          /* band event for SIGPOLL */
                   } _poll;                        /* was this ever used ? */
                   struct {
                           int32_t __spare1__;
                           int     __spare2__[7];
                   } __spare__;
           } _reason;
   };
   #endif
   
   /** si_code **/
   /* codes for SIGILL */
   #define ILL_ILLOPC      1       /* Illegal opcode.                      */
   #define ILL_ILLOPN      2       /* Illegal operand.                     */
   #define ILL_ILLADR      3       /* Illegal addressing mode.             */
   #define ILL_ILLTRP      4       /* Illegal trap.                        */
   #define ILL_PRVOPC      5       /* Privileged opcode.                   */
   #define ILL_PRVREG      6       /* Privileged register.                 */
   #define ILL_COPROC      7       /* Coprocessor error.                   */
   #define ILL_BADSTK      8       /* Internal stack error.                */
   
   /* codes for SIGBUS */
   #define BUS_ADRALN      1       /* Invalid address alignment.           */
   #define BUS_ADRERR      2       /* Nonexistent physical address.        */
   #define BUS_OBJERR      3       /* Object-specific hardware error.      */
   
   /* codes for SIGSEGV */
   #define SEGV_MAPERR     1       /* Address not mapped to object.        */
   #define SEGV_ACCERR     2       /* Invalid permissions for mapped       */
                                   /* object.                              */
   
   /* codes for SIGFPE */
   #define FPE_INTOVF      1       /* Integer overflow.                    */
   #define FPE_INTDIV      2       /* Integer divide by zero.              */
   #define FPE_FLTDIV      3       /* Floating point divide by zero.       */
   #define FPE_FLTOVF      4       /* Floating point overflow.             */
   #define FPE_FLTUND      5       /* Floating point underflow.            */
   #define FPE_FLTRES      6       /* Floating point inexact result.       */
   #define FPE_FLTINV      7       /* Invalid floating point operation.    */
   #define FPE_FLTSUB      8       /* Subscript out of range.              */
   
   /* codes for SIGTRAP */
   #define TRAP_BRKPT      1       /* Process breakpoint.                  */
   #define TRAP_TRACE      2       /* Process trace trap.                  */
   #define TRAP_DTRACE     3       /* DTrace induced trap.                 */
   #define TRAP_CAP        4       /* Capabilities protective trap.        */
   
   /* codes for SIGCHLD */
   #define CLD_EXITED      1       /* Child has exited                     */
   #define CLD_KILLED      2       /* Child has terminated abnormally but  */
                                   /* did not create a core file           */
   #define CLD_DUMPED      3       /* Child has terminated abnormally and  */
                                   /* created a core file                  */
   #define CLD_TRAPPED     4       /* Traced child has trapped             */
   #define CLD_STOPPED     5       /* Child has stopped                    */
   #define CLD_CONTINUED   6       /* Stopped child has continued          */
   
   /* codes for SIGPOLL */
   #define POLL_IN         1       /* Data input available                 */
   #define POLL_OUT        2       /* Output buffers available             */
   #define POLL_MSG        3       /* Input message available              */
   #define POLL_ERR        4       /* I/O Error                            */
   #define POLL_PRI        5       /* High priority input available        */
   #define POLL_HUP        6       /* Device disconnected                  */
   
   #endif
   
   #if __POSIX_VISIBLE || __XSI_VISIBLE
   struct __siginfo;
   
   /*
    * Signal vector "template" used in sigaction call.
    */
   struct sigaction {
           union {
                   void    (*__sa_handler)(int);
                   void    (*__sa_sigaction)(int, struct __siginfo *, void *);
           } __sigaction_u;                /* signal handler */
           int     sa_flags;               /* see signal options below */
           sigset_t sa_mask;               /* signal mask to apply */
   };
   
   #define sa_handler      __sigaction_u.__sa_handler
   #endif
   
   #if __XSI_VISIBLE
   /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
   #define sa_sigaction    __sigaction_u.__sa_sigaction
   #endif
   
   #if __POSIX_VISIBLE || __XSI_VISIBLE
   #define SA_NOCLDSTOP    0x0008  /* do not generate SIGCHLD on child stop */
   #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
   
   #if __XSI_VISIBLE
   #define SA_ONSTACK      0x0001  /* take signal on signal stack */
   #define SA_RESTART      0x0002  /* restart system call on signal return */
   #define SA_RESETHAND    0x0004  /* reset to SIG_DFL when taking signal */
   #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 */
   #endif
   
   #if __BSD_VISIBLE
   #define NSIG            32      /* number of old signals (counting 0) */
   #endif
   
   #if __POSIX_VISIBLE || __XSI_VISIBLE
   #define SI_NOINFO       0               /* No signal info besides si_signo. */
   #define SI_USER         0x10001         /* Signal sent by kill(). */
   #define SI_QUEUE        0x10002         /* Signal sent by the sigqueue(). */
   #define SI_TIMER        0x10003         /* Signal generated by expiration of */
                                           /* a timer set by timer_settime(). */
   #define SI_ASYNCIO      0x10004         /* Signal generated by completion of */
                                           /* an asynchronous I/O request.*/
   #define SI_MESGQ        0x10005         /* Signal generated by arrival of a */
                                           /* message on an empty message queue. */
   #define SI_KERNEL       0x10006
   #define SI_LWP          0x10007         /* Signal sent by thr_kill */
   #endif
   #if __BSD_VISIBLE
   #define SI_UNDEFINED    0
   #endif
   
   #if __BSD_VISIBLE
   typedef __sighandler_t  *sig_t; /* type of pointer to a signal function */
   typedef void __siginfohandler_t(int, struct __siginfo *, void *);
   #endif
   
   #if __XSI_VISIBLE
   #if __BSD_VISIBLE
   #define __stack_t sigaltstack
   #endif
   typedef struct __stack_t stack_t;
   
   #define SS_ONSTACK      0x0001  /* take signal on alternate stack */
   #define SS_DISABLE      0x0004  /* disable taking signals on alternate stack */
   #define MINSIGSTKSZ     __MINSIGSTKSZ           /* minimum stack size */
   #define SIGSTKSZ        (MINSIGSTKSZ + 32768)   /* recommended stack size */
   #endif
   
   /*
    * Structure used in sigaltstack call.  Its definition is always
    * needed for __ucontext.  If __BSD_VISIBLE is defined, the structure
    * tag is actually sigaltstack.
    */
   struct __stack_t {
           void    *ss_sp;                 /* signal stack base */
           __size_t ss_size;               /* signal stack length */
           int     ss_flags;               /* SS_DISABLE and/or SS_ONSTACK */
   };
   
   #if __BSD_VISIBLE
   /*
    * 4.3 compatibility:
    * Signal vector "template" used in sigvec call.
    */
   struct sigvec {
           __sighandler_t *sv_handler;     /* 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
   
   /* Keep this in one place only */
   #if defined(_KERNEL) && defined(COMPAT_43) && \
       !defined(__i386__)
   struct osigcontext {
           int _not_used;
   };
   #endif
   
   #if __XSI_VISIBLE
   /*
    * Structure used in sigstack call.
    */
   struct sigstack {
           void    *ss_sp;                 /* signal stack pointer */
           int     ss_onstack;             /* current status */
   };
   #endif
   
   #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
   /*
    * Macro for converting signal number to a mask suitable for
    * sigblock().
    */
   #define sigmask(m)      (1 << ((m)-1))
   #endif
   
   #if __BSD_VISIBLE
   #define BADSIG          SIG_ERR
   #endif
   
   #if __POSIX_VISIBLE || __XSI_VISIBLE
   /*
    * 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 */
   #endif
   
   /*
    * For historical reasons; programs expect signal's return value to be
    * defined by <sys/signal.h>.
    */
   __BEGIN_DECLS
   __sighandler_t *signal(int, __sighandler_t *);
   __END_DECLS
   
   #endif /* !_SYS_SIGNAL_H_ */

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