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. 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  * $DragonFly: src/sys/sys/signalvar.h,v 1.23 2008/04/21 15:47:58 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_SIGNALVAR_H_               /* tmp for user.h */
  39 #define _SYS_SIGNALVAR_H_
  40
  41 /*
  42  * Don't bring in the entire bleeding include set if we aren't the kernel.
  43  * Userland is not allowed to bring in sys/proc.h except under special
  44  * circumstances (e.g. sys/user.h)
  45  */
  46 #include <sys/signal.h>
  47 #ifdef _KERNEL
  48 #include <sys/proc.h>
  49 #include <machine/lock.h>
  50 #endif
  51
  52 /*
  53  * Kernel signal definitions and data structures,
  54  * not exported to user programs.
  55  */
  56
  57 /*
  58  * Process signal actions and state, needed only within the process
  59  * (not necessarily resident).
  60  */
  61 struct  sigacts {
  62         sig_t    ps_sigact[_SIG_MAXSIG];        /* disposition of signals */
  63         sigset_t ps_catchmask[_SIG_MAXSIG];     /* signals to be blocked */
  64         sigset_t ps_sigignore;          /* Signals being ignored. */
  65         sigset_t ps_sigcatch;           /* Signals being caught by user. */
  66         sigset_t ps_sigonstack;         /* signals to take on sigstack */
  67         sigset_t ps_sigintr;            /* signals that interrupt syscalls */
  68         sigset_t ps_sigreset;           /* signals that reset when caught */
  69         sigset_t ps_signodefer;         /* signals not masked while handled */
  70         sigset_t ps_siginfo;            /* signals that want SA_SIGINFO args */
  71         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
  72         sigset_t ps_sigmailbox;         /* signals that update a mailbox */
  73         int      ps_refcnt;
  74         int      ps_flag;
  75 };
  76
  77 /* additional signal action values, used only temporarily/internally */
  78 #define SIG_CATCH       ((__sighandler_t *)2)
  79 #define SIG_HOLD        ((__sighandler_t *)3)
  80
  81 #ifdef _KERNEL
  82
  83 /*
  84  * get signal action for process and signal; currently only for current process
  85  */
  86 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
  87
  88 #endif
  89
  90 /*
  91  * sigset_t manipulation macros
  92  */
  93 #define SIGADDSET(set, signo)                                           \
  94         (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)
  95
  96 #define SIGDELSET(set, signo)                                           \
  97         (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_CONTSIGMASK(set)                                            \
 151         SIGDELSET(set, SIGCONT)
 152
 153 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
 154
 155 static __inline int
 156 __sigisempty(sigset_t *set)
 157 {
 158         int i;
 159
 160         for (i = 0; i < _SIG_WORDS; i++) {
 161                 if (set->__bits[i])
 162                         return (0);
 163         }
 164         return (1);
 165 }
 166
 167 static __inline int
 168 __sigseteq(sigset_t *set1, sigset_t *set2)
 169 {
 170         int i;
 171
 172         for (i = 0; i < _SIG_WORDS; i++) {
 173                 if (set1->__bits[i] != set2->__bits[i])
 174                         return (0);
 175         }
 176         return (1);
 177 }
 178
 179 #ifdef _KERNEL
 180
 181 typedef void (*proc_func_t)(struct proc *);
 182
 183 struct pgrp;
 184 struct proc;
 185 struct sigio;
 186 struct vmupcall;
 187
 188 extern int sugid_coredump;      /* Sysctl variable kern.sugid_coredump */
 189
 190 /*
 191  * Machine-independent functions:
 192  */
 193 void    execsigs (struct proc *p);
 194 void    gsignal (int pgid, int sig);
 195 int     issignal (struct lwp *lp);
 196 int     iscaught (struct lwp *p);
 197 void    killproc (struct proc *p, char *why);
 198 void    pgsigio (struct sigio *, int signum, int checkctty);
 199 void    pgsignal (struct pgrp *pgrp, int sig, int checkctty);
 200 void    postsig (int sig);
 201 void    ksignal (struct proc *p, int sig);
 202 void    lwpsignal (struct proc *p, struct lwp *lp, int sig);
 203 void    lwp_signotify (struct lwp *lp);
 204 void    siginit (struct proc *p);
 205 void    trapsignal (struct lwp *p, int sig, u_long code);
 206
 207 /*
 208  * Machine-dependent functions:
 209  */
 210 void    sendsig (sig_t action, int sig, sigset_t *retmask, u_long code);
 211 void    sendupcall (struct vmupcall *vu, int morepending);
 212 int     fetchupcall (struct vmupcall *vu, int morepending, void *rsp);
 213 void    sigexit (struct lwp *lp, int sig);
 214 int     checkpoint_signal_handler(struct lwp *p);
 215
 216 #endif  /* _KERNEL */
 217
 218 #endif  /* !_SYS_SIGNALVAR_H_ */