sys/sys/signalvar.h

   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)signalvar.h 8.6 (Berkeley) 2/19/95
  30  * $FreeBSD: src/sys/sys/signalvar.h,v 1.34.2.1 2000/05/16 06:58:05 dillon Exp $
  31  */
  32
  33 #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
  34 #define _SYS_SIGNALVAR_H_
  35
  36 /*
  37  * Don't bring in the entire bleeding include set if we aren't the kernel.
  38  * Userland is not allowed to bring in sys/proc.h except under special
  39  * circumstances (e.g. sys/user.h)
  40  */
  41 #include <sys/signal.h>
  42 #ifdef _KERNEL
  43 #include <sys/proc.h>
  44 #include <machine/lock.h>
  45 #endif
  46
  47 /*
  48  * Kernel signal definitions and data structures,
  49  * not exported to user programs.
  50  */
  51
  52 /*
  53  * Process signal actions and state, needed only within the process
  54  * (not necessarily resident).
  55  */
  56 struct  sigacts {
  57         sig_t    ps_sigact[_SIG_MAXSIG];        /* disposition of signals */
  58         sigset_t ps_catchmask[_SIG_MAXSIG];     /* signals to be blocked */
  59         sigset_t ps_sigignore;          /* Signals being ignored. */
  60         sigset_t ps_sigcatch;           /* Signals being caught by user. */
  61         sigset_t ps_sigonstack;         /* signals to take on sigstack */
  62         sigset_t ps_sigintr;            /* signals that interrupt syscalls */
  63         sigset_t ps_sigreset;           /* signals that reset when caught */
  64         sigset_t ps_signodefer;         /* signals not masked while handled */
  65         sigset_t ps_siginfo;            /* signals that want SA_SIGINFO args */
  66         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
  67         unsigned int ps_refcnt;
  68         int      ps_flag;
  69 };
  70
  71 /* additional signal action values, used only temporarily/internally */
  72 #define SIG_CATCH       ((__sighandler_t *)2)
  73 #define SIG_HOLD        ((__sighandler_t *)3)
  74
  75 #ifdef _KERNEL
  76
  77 /*
  78  * get signal action for process and signal; currently only for current process
  79  */
  80 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
  81
  82 #endif
  83
  84 /*
  85  * sigset_t manipulation macros
  86  */
  87 #define SIGADDSET(set, signo)                                           \
  88         (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)
  89
  90 #define SIGADDSET_ATOMIC(set, signo)                                    \
  91         atomic_set_int(&(set).__bits[_SIG_WORD(signo)], _SIG_BIT(signo))
  92
  93 #define SIGDELSET(set, signo)                                           \
  94         (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)
  95
  96 #define SIGDELSET_ATOMIC(set, signo)                                    \
  97         atomic_clear_int(&(set).__bits[_SIG_WORD(signo)], _SIG_BIT(signo))
  98
  99 #define SIGEMPTYSET(set)                                                \
 100         do {                                                            \
 101                 int __i;                                                \
 102                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 103                         (set).__bits[__i] = 0;                          \
 104         } while (0)
 105
 106 #define SIGFILLSET(set)                                                 \
 107         do {                                                            \
 108                 int __i;                                                \
 109                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 110                         (set).__bits[__i] = ~(unsigned int)0;           \
 111         } while (0)
 112
 113 #define SIGISMEMBER(set, signo)                                         \
 114         ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
 115
 116 #define SIGISEMPTY(set)         __sigisempty(&(set))
 117 #define SIGNOTEMPTY(set)        (!__sigisempty(&(set)))
 118
 119 #define SIGSETEQ(set1, set2)    __sigseteq(&(set1), &(set2))
 120 #define SIGSETNEQ(set1, set2)   (!__sigseteq(&(set1), &(set2)))
 121
 122 #define SIGSETOR(set1, set2)                                            \
 123         do {                                                            \
 124                 int __i;                                                \
 125                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 126                         (set1).__bits[__i] |= (set2).__bits[__i];       \
 127         } while (0)
 128
 129 #define SIGSETAND(set1, set2)                                           \
 130         do {                                                            \
 131                 int __i;                                                \
 132                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 133                         (set1).__bits[__i] &= (set2).__bits[__i];       \
 134         } while (0)
 135
 136 #define SIGSETNAND(set1, set2)                                          \
 137         do {                                                            \
 138                 int __i;                                                \
 139                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 140                         (set1).__bits[__i] &= ~(set2).__bits[__i];      \
 141         } while (0)
 142
 143 #define SIG_CANTMASK(set)                                               \
 144         SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
 145
 146 #define SIG_STOPSIGMASK(set)                                            \
 147         SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP),               \
 148         SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
 149
 150 #define SIG_STOPSIGMASK_ATOMIC(set)                                     \
 151         SIGDELSET_ATOMIC(set, SIGSTOP), SIGDELSET_ATOMIC(set, SIGTSTP), \
 152         SIGDELSET_ATOMIC(set, SIGTTIN), SIGDELSET_ATOMIC(set, SIGTTOU)
 153
 154 #define SIG_CONTSIGMASK(set)                                            \
 155         SIGDELSET(set, SIGCONT)
 156
 157 #define SIG_CONTSIGMASK_ATOMIC(set)                                     \
 158         SIGDELSET_ATOMIC(set, SIGCONT)
 159
 160 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
 161
 162 static __inline int
 163 __sigisempty(sigset_t *set)
 164 {
 165         int i;
 166
 167         for (i = 0; i < _SIG_WORDS; i++) {
 168                 if (set->__bits[i])
 169                         return (0);
 170         }
 171         return (1);
 172 }
 173
 174 static __inline int
 175 __sigseteq(sigset_t *set1, sigset_t *set2)
 176 {
 177         int i;
 178
 179         for (i = 0; i < _SIG_WORDS; i++) {
 180                 if (set1->__bits[i] != set2->__bits[i])
 181                         return (0);
 182         }
 183         return (1);
 184 }
 185
 186 #ifdef _KERNEL
 187
 188 typedef void (*proc_func_t)(struct proc *);
 189
 190 struct pgrp;
 191 struct proc;
 192 struct sigio;
 193
 194 extern int sugid_coredump;      /* Sysctl variable kern.sugid_coredump */
 195
 196 /*
 197  * Machine-independent functions:
 198  */
 199 void    execsigs (struct proc *p);
 200 void    gsignal (int pgid, int sig);
 201 int     issignal (struct lwp *lp, int maytrace, int *ptokp);
 202 int     iscaught (struct lwp *p);
 203 void    killproc (struct proc *p, char *why);
 204 void    pgsigio (struct sigio *, int signum, int checkctty);
 205 void    pgsignal (struct pgrp *pgrp, int sig, int checkctty);
 206 void    postsig (int sig, int ptok);
 207 void    ksignal (struct proc *p, int sig);
 208 void    lwpsignal (struct proc *p, struct lwp *lp, int sig);
 209 void    siginit (struct proc *p);
 210 void    trapsignal (struct lwp *p, int sig, u_long code);
 211
 212 /*
 213  * Machine-dependent functions:
 214  */
 215 void    sendsig (sig_t action, int sig, sigset_t *retmask, u_long code);
 216 void    sigexit (struct lwp *lp, int sig) __dead2;
 217 int     checkpoint_signal_handler(struct lwp *p);
 218
 219 #endif  /* _KERNEL */
 220
 221 #endif  /* !_SYS_SIGNALVAR_H_ */