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: releng/5.0/sys/sys/signalvar.h 105950 2002-10-25 19:10:58Z peter $
   35  */
   36 
   37 #ifndef _SYS_SIGNALVAR_H_
   38 #define _SYS_SIGNALVAR_H_
   39 
   40 #include <sys/signal.h>
   41 
   42 /*
   43  * Kernel signal definitions and data structures,
   44  * not exported to user programs.
   45  */
   46 
   47 /*
   48  * Process signal actions and state, needed only within the process
   49  * (not necessarily resident).
   50  */
   51 struct sigacts {
   52         sig_t   ps_sigact[_SIG_MAXSIG]; /* disposition of signals */
   53         sigset_t ps_catchmask[_SIG_MAXSIG];     /* signals to be blocked */
   54         sigset_t ps_sigonstack;         /* signals to take on sigstack */
   55         sigset_t ps_sigintr;            /* signals that interrupt syscalls */
   56         sigset_t ps_sigreset;           /* signals that reset when caught */
   57         sigset_t ps_signodefer;         /* signals not masked while handled */
   58         sigset_t ps_siginfo;            /* signals that want SA_SIGINFO args */
   59         sigset_t ps_freebsd4;           /* signals that use freebsd4 ucontext */
   60         sigset_t ps_osigset;            /* signals that use <= 3.x osigset_t */
   61         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp XXX */
   62 };
   63 
   64 #if defined(_KERNEL) && defined(COMPAT_43)
   65 /*
   66  * Compatibility.
   67  */
   68 typedef struct {
   69         struct osigcontext si_sc;
   70         int             si_signo;
   71         int             si_code;
   72         union sigval    si_value;
   73 } osiginfo_t;
   74 
   75 struct osigaction {
   76         union {
   77                 void    (*__sa_handler)(int);
   78                 void    (*__sa_sigaction)(int, osiginfo_t *, void *);
   79         } __sigaction_u;                /* signal handler */
   80         osigset_t       sa_mask;        /* signal mask to apply */
   81         int             sa_flags;       /* see signal options below */
   82 };
   83 
   84 typedef void __osiginfohandler_t(int, osiginfo_t *, void *);
   85 #endif /* _KERNEL && COMPAT_43 */
   86 
   87 /* additional signal action values, used only temporarily/internally */
   88 #define SIG_CATCH       ((__sighandler_t *)2)
   89 #define SIG_HOLD        ((__sighandler_t *)3)
   90 
   91 /*
   92  * get signal action for process and signal; currently only for current process
   93  */
   94 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
   95 
   96 /*
   97  * sigset_t manipulation macros
   98  */
   99 #define SIGADDSET(set, signo)                                           \
  100         ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo))
  101 
  102 #define SIGDELSET(set, signo)                                           \
  103         ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo))
  104 
  105 #define SIGEMPTYSET(set)                                                \
  106         do {                                                            \
  107                 int __i;                                                \
  108                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  109                         (set).__bits[__i] = 0;                          \
  110         } while (0)
  111 
  112 #define SIGFILLSET(set)                                                 \
  113         do {                                                            \
  114                 int __i;                                                \
  115                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  116                         (set).__bits[__i] = ~0U;                        \
  117         } while (0)
  118 
  119 #define SIGISMEMBER(set, signo)                                         \
  120         ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
  121 
  122 #define SIGISEMPTY(set)         (__sigisempty(&(set)))
  123 #define SIGNOTEMPTY(set)        (!__sigisempty(&(set)))
  124 
  125 #define SIGSETEQ(set1, set2)    (__sigseteq(&(set1), &(set2)))
  126 #define SIGSETNEQ(set1, set2)   (!__sigseteq(&(set1), &(set2)))
  127 
  128 #define SIGSETOR(set1, set2)                                            \
  129         do {                                                            \
  130                 int __i;                                                \
  131                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  132                         (set1).__bits[__i] |= (set2).__bits[__i];       \
  133         } while (0)
  134 
  135 #define SIGSETAND(set1, set2)                                           \
  136         do {                                                            \
  137                 int __i;                                                \
  138                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  139                         (set1).__bits[__i] &= (set2).__bits[__i];       \
  140         } while (0)
  141 
  142 #define SIGSETNAND(set1, set2)                                          \
  143         do {                                                            \
  144                 int __i;                                                \
  145                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  146                         (set1).__bits[__i] &= ~(set2).__bits[__i];      \
  147         } while (0)
  148 
  149 #define SIGSETLO(set1, set2)    ((set1).__bits[0] = (set2).__bits[0])
  150 #define SIGSETOLD(set, oset)    ((set).__bits[0] = (oset))
  151 
  152 #define SIG_CANTMASK(set)                                               \
  153         SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
  154 
  155 #define SIG_STOPSIGMASK(set)                                            \
  156         SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP),               \
  157         SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
  158 
  159 #define SIG_CONTSIGMASK(set)                                            \
  160         SIGDELSET(set, SIGCONT)
  161 
  162 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
  163 
  164 #define SIG2OSIG(sig, osig)     (osig = (sig).__bits[0])
  165 #define OSIG2SIG(osig, sig)     SIGEMPTYSET(sig); (sig).__bits[0] = osig
  166 
  167 static __inline int
  168 __sigisempty(sigset_t *set)
  169 {
  170         int i;
  171 
  172         for (i = 0; i < _SIG_WORDS; i++) {
  173                 if (set->__bits[i])
  174                         return (0);
  175         }
  176         return (1);
  177 }
  178 
  179 static __inline int
  180 __sigseteq(sigset_t *set1, sigset_t *set2)
  181 {
  182         int i;
  183 
  184         for (i = 0; i < _SIG_WORDS; i++) {
  185                 if (set1->__bits[i] != set2->__bits[i])
  186                         return (0);
  187         }
  188         return (1);
  189 }
  190 
  191 #ifdef _KERNEL
  192 
  193 /* Return nonzero if process p has an unmasked pending signal. */
  194 #define SIGPENDING(p)                                                   \
  195         (!SIGISEMPTY((p)->p_siglist) &&                                 \
  196             (!sigsetmasked(&(p)->p_siglist, &(p)->p_sigmask) ||         \
  197             (p)->p_flag & P_TRACED))
  198 
  199 /*
  200  * Return the value of the pseudo-expression ((*set & ~*mask) != 0).  This
  201  * is an optimized version of SIGISEMPTY() on a temporary variable
  202  * containing SIGSETNAND(*set, *mask).
  203  */
  204 static __inline int
  205 sigsetmasked(sigset_t *set, sigset_t *mask)
  206 {
  207         int i;
  208 
  209         for (i = 0; i < _SIG_WORDS; i++) {
  210                 if (set->__bits[i] & ~mask->__bits[i])
  211                         return (0);
  212         }
  213         return (1);
  214 }
  215 
  216 struct pgrp;
  217 struct thread;
  218 struct proc;
  219 struct sigio;
  220 struct mtx;
  221 
  222 extern int sugid_coredump;      /* Sysctl variable kern.sugid_coredump */
  223 extern struct mtx       sigio_lock;
  224 
  225 /*
  226  * Lock the pointers for a sigio object in the underlying objects of
  227  * a file descriptor.
  228  */
  229 #define SIGIO_LOCK()    mtx_lock(&sigio_lock)
  230 #define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock)
  231 #define SIGIO_UNLOCK()  mtx_unlock(&sigio_lock)
  232 #define SIGIO_LOCKED()  mtx_owned(&sigio_lock)
  233 #define SIGIO_ASSERT(type)      mtx_assert(&sigio_lock, type)
  234 
  235 /*
  236  * Machine-independent functions:
  237  */
  238 int     cursig(struct thread *td);
  239 void    execsigs(struct proc *p);
  240 void    gsignal(int pgid, int sig);
  241 int     issignal(struct thread *p);
  242 void    killproc(struct proc *p, char *why);
  243 void    pgsigio(struct sigio **, int signum, int checkctty);
  244 void    pgsignal(struct pgrp *pgrp, int sig, int checkctty);
  245 void    postsig(int sig);
  246 void    psignal(struct proc *p, int sig);
  247 void    sigexit(struct thread *td, int signum) __dead2;
  248 void    siginit(struct proc *p);
  249 void    signotify(struct proc *p);
  250 void    trapsignal(struct proc *p, int sig, u_long code);
  251 
  252 /*
  253  * Machine-dependent functions:
  254  */
  255 void    sendsig(sig_t action, int sig, sigset_t *retmask, u_long code);
  256 
  257 #endif /* _KERNEL */
  258 
  259 #endif /* !_SYS_SIGNALVAR_H_ */
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FreeBSD/Linux Kernel Cross Reference sys/sys/signalvar.h

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