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 1.12 2004/11/23 06:32:34 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_sigonstack;         /* signals to take on sigstack */
  65         sigset_t ps_sigintr;            /* signals that interrupt syscalls */
  66         sigset_t ps_sigreset;           /* signals that reset when caught */
  67         sigset_t ps_signodefer;         /* signals not masked while handled */
  68         sigset_t ps_siginfo;            /* signals that want SA_SIGINFO args */
  69         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
  70 };
  71
  72 /* additional signal action values, used only temporarily/internally */
  73 #define SIG_CATCH       ((__sighandler_t *)2)
  74 #define SIG_HOLD        ((__sighandler_t *)3)
  75
  76 #ifdef _KERNEL
  77
  78 /*
  79  * get signal action for process and signal; currently only for current process
  80  */
  81 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
  82
  83 #endif
  84
  85 /*
  86  * sigset_t manipulation macros
  87  */
  88 #define SIGADDSET(set, signo)                                           \
  89         (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)
  90
  91 #define SIGDELSET(set, signo)                                           \
  92         (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)
  93
  94 #define SIGEMPTYSET(set)                                                \
  95         do {                                                            \
  96                 int __i;                                                \
  97                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  98                         (set).__bits[__i] = 0;                          \
  99         } while (0)
 100
 101 #define SIGFILLSET(set)                                                 \
 102         do {                                                            \
 103                 int __i;                                                \
 104                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 105                         (set).__bits[__i] = ~(unsigned int)0;           \
 106         } while (0)
 107
 108 #define SIGISMEMBER(set, signo)                                         \
 109         ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
 110
 111 #define SIGISEMPTY(set)         __sigisempty(&(set))
 112 #define SIGNOTEMPTY(set)        (!__sigisempty(&(set)))
 113
 114 #define SIGSETEQ(set1, set2)    __sigseteq(&(set1), &(set2))
 115 #define SIGSETNEQ(set1, set2)   (!__sigseteq(&(set1), &(set2)))
 116
 117 #define SIGSETOR(set1, set2)                                            \
 118         do {                                                            \
 119                 int __i;                                                \
 120                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 121                         (set1).__bits[__i] |= (set2).__bits[__i];       \
 122         } while (0)
 123
 124 #define SIGSETAND(set1, set2)                                           \
 125         do {                                                            \
 126                 int __i;                                                \
 127                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 128                         (set1).__bits[__i] &= (set2).__bits[__i];       \
 129         } while (0)
 130
 131 #define SIGSETNAND(set1, set2)                                          \
 132         do {                                                            \
 133                 int __i;                                                \
 134                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
 135                         (set1).__bits[__i] &= ~(set2).__bits[__i];      \
 136         } while (0)
 137
 138 #define SIG_CANTMASK(set)                                               \
 139         SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
 140
 141 #define SIG_STOPSIGMASK(set)                                            \
 142         SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP),               \
 143         SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
 144
 145 #define SIG_CONTSIGMASK(set)                                            \
 146         SIGDELSET(set, SIGCONT)
 147
 148 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
 149
 150 static __inline int
 151 __sigisempty(sigset_t *set)
 152 {
 153         int i;
 154
 155         for (i = 0; i < _SIG_WORDS; i++) {
 156                 if (set->__bits[i])
 157                         return (0);
 158         }
 159         return (1);
 160 }
 161
 162 static __inline int
 163 __sigseteq(sigset_t *set1, sigset_t *set2)
 164 {
 165         int i;
 166
 167         for (i = 0; i < _SIG_WORDS; i++) {
 168                 if (set1->__bits[i] != set2->__bits[i])
 169                         return (0);
 170         }
 171         return (1);
 172 }
 173
 174 #ifdef _KERNEL
 175
 176 typedef void (*proc_func_t)(struct proc *);
 177
 178 struct pgrp;
 179 struct proc;
 180 struct sigio;
 181 struct vmupcall;
 182
 183 extern int sugid_coredump;      /* Sysctl variable kern.sugid_coredump */
 184
 185 /*
 186  * Machine-independent functions:
 187  */
 188 void    check_sigacts (void);
 189 void    execsigs (struct proc *p);
 190 void    gsignal (int pgid, int sig);
 191 int     issignal (struct proc *p);
 192 int     iscaught (struct proc *p);
 193 void    killproc (struct proc *p, char *why);
 194 void    pgsigio (struct sigio *, int signum, int checkctty);
 195 void    pgsignal (struct pgrp *pgrp, int sig, int checkctty);
 196 void    postsig (int sig);
 197 void    psignal (struct proc *p, int sig);
 198 void    siginit (struct proc *p);
 199 void    trapsignal (struct proc *p, int sig, u_long code);
 200 int     __cursig (struct proc *p);
 201
 202 /*
 203  * Machine-dependent functions:
 204  */
 205 void    sendsig (sig_t action, int sig, sigset_t *retmask, u_long code);
 206 void    sendupcall (struct vmupcall *vu, int morepending);
 207 int     fetchupcall (struct vmupcall *vu, int morepending, void *rsp);
 208 void    sigexit (struct proc *p, int sig);
 209 int     checkpoint_signal_handler(struct proc *p);
 210
 211 /*
 212  * Inline functions:
 213  */
 214 #define CURSIG(p)       __cursig(p)
 215
 216 /*
 217  * Determine signal that should be delivered to process p, the current
 218  * process, 0 if none.  If there is a pending stop signal with default
 219  * action, the process stops in issignal().
 220  *
 221  * MP SAFE
 222  */
 223 extern __inline int __cursig(struct proc *p)
 224 {
 225         sigset_t tmpset;
 226         int r;
 227
 228         tmpset = p->p_siglist;
 229         SIGSETNAND(tmpset, p->p_sigmask);
 230         if (SIGISEMPTY(p->p_siglist) ||
 231              (!(p->p_flag & P_TRACED) && SIGISEMPTY(tmpset))) {
 232                 return(0);
 233         }
 234         r = issignal(p);
 235         return(r);
 236 }
 237
 238 #endif  /* _KERNEL */
 239
 240 #endif  /* !_SYS_SIGNALVAR_H_ */