The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)signalvar.h 8.6 (Berkeley) 2/19/95
   34  * $FreeBSD: src/sys/sys/signalvar.h,v 1.34.2.1 2000/05/16 06:58:05 dillon Exp $
   35  */
   36 
   37 #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
   38 #define _SYS_SIGNALVAR_H_
   39 
   40 /*
   41  * Don't bring in the entire bleeding include set if we aren't the kernel.
   42  * Userland is not allowed to bring in sys/proc.h except under special
   43  * circumstances (e.g. sys/user.h)
   44  */
   45 #include <sys/signal.h>
   46 #ifdef _KERNEL
   47 #include <sys/proc.h>
   48 #include <machine/lock.h>
   49 #endif
   50 
   51 /*
   52  * Kernel signal definitions and data structures,
   53  * not exported to user programs.
   54  */
   55 
   56 /*
   57  * Process signal actions and state, needed only within the process
   58  * (not necessarily resident).
   59  */
   60 struct  sigacts {
   61         sig_t    ps_sigact[_SIG_MAXSIG];        /* disposition of signals */
   62         sigset_t ps_catchmask[_SIG_MAXSIG];     /* signals to be blocked */
   63         sigset_t ps_sigignore;          /* Signals being ignored. */
   64         sigset_t ps_sigcatch;           /* Signals being caught by user. */
   65         sigset_t ps_sigonstack;         /* signals to take on sigstack */
   66         sigset_t ps_sigintr;            /* signals that interrupt syscalls */
   67         sigset_t ps_sigreset;           /* signals that reset when caught */
   68         sigset_t ps_signodefer;         /* signals not masked while handled */
   69         sigset_t ps_siginfo;            /* signals that want SA_SIGINFO args */
   70         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
   71         unsigned int ps_refcnt;
   72         int      ps_flag;
   73 };
   74 
   75 /* additional signal action values, used only temporarily/internally */
   76 #define SIG_CATCH       ((__sighandler_t *)2)
   77 #define SIG_HOLD        ((__sighandler_t *)3)
   78 
   79 #ifdef _KERNEL
   80 
   81 /*
   82  * get signal action for process and signal; currently only for current process
   83  */
   84 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
   85 
   86 #endif
   87 
   88 /*
   89  * sigset_t manipulation macros
   90  */
   91 #define SIGADDSET(set, signo)                                           \
   92         (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)
   93 
   94 #define SIGDELSET(set, signo)                                           \
   95         (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)
   96 
   97 #define SIGEMPTYSET(set)                                                \
   98         do {                                                            \
   99                 int __i;                                                \
  100                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  101                         (set).__bits[__i] = 0;                          \
  102         } while (0)
  103 
  104 #define SIGFILLSET(set)                                                 \
  105         do {                                                            \
  106                 int __i;                                                \
  107                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  108                         (set).__bits[__i] = ~(unsigned int)0;           \
  109         } while (0)
  110 
  111 #define SIGISMEMBER(set, signo)                                         \
  112         ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
  113 
  114 #define SIGISEMPTY(set)         __sigisempty(&(set))
  115 #define SIGNOTEMPTY(set)        (!__sigisempty(&(set)))
  116 
  117 #define SIGSETEQ(set1, set2)    __sigseteq(&(set1), &(set2))
  118 #define SIGSETNEQ(set1, set2)   (!__sigseteq(&(set1), &(set2)))
  119 
  120 #define SIGSETOR(set1, set2)                                            \
  121         do {                                                            \
  122                 int __i;                                                \
  123                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  124                         (set1).__bits[__i] |= (set2).__bits[__i];       \
  125         } while (0)
  126 
  127 #define SIGSETAND(set1, set2)                                           \
  128         do {                                                            \
  129                 int __i;                                                \
  130                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  131                         (set1).__bits[__i] &= (set2).__bits[__i];       \
  132         } while (0)
  133 
  134 #define SIGSETNAND(set1, set2)                                          \
  135         do {                                                            \
  136                 int __i;                                                \
  137                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  138                         (set1).__bits[__i] &= ~(set2).__bits[__i];      \
  139         } while (0)
  140 
  141 #define SIG_CANTMASK(set)                                               \
  142         SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
  143 
  144 #define SIG_STOPSIGMASK(set)                                            \
  145         SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP),               \
  146         SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
  147 
  148 #define SIG_CONTSIGMASK(set)                                            \
  149         SIGDELSET(set, SIGCONT)
  150 
  151 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
  152 
  153 static __inline int
  154 __sigisempty(sigset_t *set)
  155 {
  156         int i;
  157 
  158         for (i = 0; i < _SIG_WORDS; i++) {
  159                 if (set->__bits[i])
  160                         return (0);
  161         }
  162         return (1);
  163 }
  164 
  165 static __inline int
  166 __sigseteq(sigset_t *set1, sigset_t *set2)
  167 {
  168         int i;
  169 
  170         for (i = 0; i < _SIG_WORDS; i++) {
  171                 if (set1->__bits[i] != set2->__bits[i])
  172                         return (0);
  173         }
  174         return (1);
  175 }
  176 
  177 #ifdef _KERNEL
  178 
  179 typedef void (*proc_func_t)(struct proc *);
  180 
  181 struct pgrp;
  182 struct proc;
  183 struct sigio;
  184 
  185 extern int sugid_coredump;      /* Sysctl variable kern.sugid_coredump */
  186 
  187 /*
  188  * Machine-independent functions:
  189  */
  190 void    execsigs (struct proc *p);
  191 void    gsignal (int pgid, int sig);
  192 int     issignal (struct lwp *lp, int maytrace);
  193 int     iscaught (struct lwp *p);
  194 void    killproc (struct proc *p, char *why);
  195 void    pgsigio (struct sigio *, int signum, int checkctty);
  196 void    pgsignal (struct pgrp *pgrp, int sig, int checkctty);
  197 void    postsig (int sig);
  198 void    ksignal (struct proc *p, int sig);
  199 void    lwpsignal (struct proc *p, struct lwp *lp, int sig);
  200 void    siginit (struct proc *p);
  201 void    trapsignal (struct lwp *p, int sig, u_long code);
  202 
  203 /*
  204  * Machine-dependent functions:
  205  */
  206 void    sendsig (sig_t action, int sig, sigset_t *retmask, u_long code);
  207 void    sigexit (struct lwp *lp, int sig);
  208 int     checkpoint_signal_handler(struct lwp *p);
  209 
  210 #endif  /* _KERNEL */
  211 
  212 #endif  /* !_SYS_SIGNALVAR_H_ */

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