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  * 4. 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  * $FreeBSD$
   31  */
   32 
   33 #ifndef _SYS_SIGNALVAR_H_
   34 #define _SYS_SIGNALVAR_H_
   35 
   36 #include <sys/queue.h>
   37 #include <sys/_lock.h>
   38 #include <sys/_mutex.h>
   39 #include <sys/signal.h>
   40 
   41 /*
   42  * Kernel signal definitions and data structures,
   43  * not exported to user programs.
   44  */
   45 
   46 /*
   47  * Logical process signal actions and state, needed only within the process
   48  * The mapping between sigacts and proc structures is 1:1 except for rfork()
   49  * processes masquerading as threads which use one structure for the whole
   50  * group.  All members are locked by the included mutex.  The reference count
   51  * and mutex must be last for the bcopy in sigacts_copy() to work.
   52  */
   53 struct sigacts {
   54         sig_t   ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */
   55         sigset_t ps_catchmask[_SIG_MAXSIG];     /* Signals to be blocked. */
   56         sigset_t ps_sigonstack;         /* Signals to take on sigstack. */
   57         sigset_t ps_sigintr;            /* Signals that interrupt syscalls. */
   58         sigset_t ps_sigreset;           /* Signals that reset when caught. */
   59         sigset_t ps_signodefer;         /* Signals not masked while handled. */
   60         sigset_t ps_siginfo;            /* Signals that want SA_SIGINFO args. */
   61         sigset_t ps_sigignore;          /* Signals being ignored. */
   62         sigset_t ps_sigcatch;           /* Signals being caught by user. */
   63         sigset_t ps_freebsd4;           /* signals using freebsd4 ucontext. */
   64         sigset_t ps_osigset;            /* Signals using <= 3.x osigset_t. */
   65         sigset_t ps_usertramp;          /* SunOS compat; libc sigtramp. XXX */
   66         int     ps_flag;
   67         int     ps_refcnt;
   68         struct mtx ps_mtx;
   69 };
   70 
   71 #define PS_NOCLDWAIT    0x0001  /* No zombies if child dies */
   72 #define PS_NOCLDSTOP    0x0002  /* No SIGCHLD when children stop. */
   73 #define PS_CLDSIGIGN    0x0004  /* The SIGCHLD handler is SIG_IGN. */
   74 
   75 #if defined(_KERNEL) && defined(COMPAT_43)
   76 /*
   77  * Compatibility.
   78  */
   79 typedef struct {
   80         struct osigcontext si_sc;
   81         int             si_signo;
   82         int             si_code;
   83         union sigval    si_value;
   84 } osiginfo_t;
   85 
   86 struct osigaction {
   87         union {
   88                 void    (*__sa_handler)(int);
   89                 void    (*__sa_sigaction)(int, osiginfo_t *, void *);
   90         } __sigaction_u;                /* signal handler */
   91         osigset_t       sa_mask;        /* signal mask to apply */
   92         int             sa_flags;       /* see signal options below */
   93 };
   94 
   95 typedef void __osiginfohandler_t(int, osiginfo_t *, void *);
   96 #endif /* _KERNEL && COMPAT_43 */
   97 
   98 /* additional signal action values, used only temporarily/internally */
   99 #define SIG_CATCH       ((__sighandler_t *)2)
  100 #define SIG_HOLD        ((__sighandler_t *)3)
  101 
  102 /*
  103  * get signal action for process and signal; currently only for current process
  104  */
  105 #define SIGACTION(p, sig)       (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
  106 
  107 /*
  108  * sigset_t manipulation macros
  109  */
  110 #define SIGADDSET(set, signo)                                           \
  111         ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo))
  112 
  113 #define SIGDELSET(set, signo)                                           \
  114         ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo))
  115 
  116 #define SIGEMPTYSET(set)                                                \
  117         do {                                                            \
  118                 int __i;                                                \
  119                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  120                         (set).__bits[__i] = 0;                          \
  121         } while (0)
  122 
  123 #define SIGFILLSET(set)                                                 \
  124         do {                                                            \
  125                 int __i;                                                \
  126                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  127                         (set).__bits[__i] = ~0U;                        \
  128         } while (0)
  129 
  130 #define SIGISMEMBER(set, signo)                                         \
  131         ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
  132 
  133 #define SIGISEMPTY(set)         (__sigisempty(&(set)))
  134 #define SIGNOTEMPTY(set)        (!__sigisempty(&(set)))
  135 
  136 #define SIGSETEQ(set1, set2)    (__sigseteq(&(set1), &(set2)))
  137 #define SIGSETNEQ(set1, set2)   (!__sigseteq(&(set1), &(set2)))
  138 
  139 #define SIGSETOR(set1, set2)                                            \
  140         do {                                                            \
  141                 int __i;                                                \
  142                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  143                         (set1).__bits[__i] |= (set2).__bits[__i];       \
  144         } while (0)
  145 
  146 #define SIGSETAND(set1, set2)                                           \
  147         do {                                                            \
  148                 int __i;                                                \
  149                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  150                         (set1).__bits[__i] &= (set2).__bits[__i];       \
  151         } while (0)
  152 
  153 #define SIGSETNAND(set1, set2)                                          \
  154         do {                                                            \
  155                 int __i;                                                \
  156                 for (__i = 0; __i < _SIG_WORDS; __i++)                  \
  157                         (set1).__bits[__i] &= ~(set2).__bits[__i];      \
  158         } while (0)
  159 
  160 #define SIGSETLO(set1, set2)    ((set1).__bits[0] = (set2).__bits[0])
  161 #define SIGSETOLD(set, oset)    ((set).__bits[0] = (oset))
  162 
  163 #define SIG_CANTMASK(set)                                               \
  164         SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
  165 
  166 #define SIG_STOPSIGMASK(set)                                            \
  167         SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP),               \
  168         SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
  169 
  170 #define SIG_CONTSIGMASK(set)                                            \
  171         SIGDELSET(set, SIGCONT)
  172 
  173 #define sigcantmask     (sigmask(SIGKILL) | sigmask(SIGSTOP))
  174 
  175 #define SIG2OSIG(sig, osig)     (osig = (sig).__bits[0])
  176 #define OSIG2SIG(osig, sig)     SIGEMPTYSET(sig); (sig).__bits[0] = osig
  177 
  178 static __inline int
  179 __sigisempty(sigset_t *set)
  180 {
  181         int i;
  182 
  183         for (i = 0; i < _SIG_WORDS; i++) {
  184                 if (set->__bits[i])
  185                         return (0);
  186         }
  187         return (1);
  188 }
  189 
  190 static __inline int
  191 __sigseteq(sigset_t *set1, sigset_t *set2)
  192 {
  193         int i;
  194 
  195         for (i = 0; i < _SIG_WORDS; i++) {
  196                 if (set1->__bits[i] != set2->__bits[i])
  197                         return (0);
  198         }
  199         return (1);
  200 }
  201 
  202 #ifdef _KERNEL
  203 
  204 /*
  205  * Specifies the target of a signal.
  206  *      P - Doesn't matter which thread it gets delivered to.
  207  *      TD - Must be delivered to a specific thread.
  208  */
  209 typedef enum sigtarget_enum { SIGTARGET_P, SIGTARGET_TD } sigtarget_t;
  210 
  211 /* Return nonzero if process p has an unmasked pending signal. */
  212 #define SIGPENDING(td)                                                  \
  213         (!SIGISEMPTY((td)->td_siglist) &&                               \
  214             !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask))
  215 
  216 /*
  217  * Return the value of the pseudo-expression ((*set & ~*mask) != 0).  This
  218  * is an optimized version of SIGISEMPTY() on a temporary variable
  219  * containing SIGSETNAND(*set, *mask).
  220  */
  221 static __inline int
  222 sigsetmasked(sigset_t *set, sigset_t *mask)
  223 {
  224         int i;
  225 
  226         for (i = 0; i < _SIG_WORDS; i++) {
  227                 if (set->__bits[i] & ~mask->__bits[i])
  228                         return (0);
  229         }
  230         return (1);
  231 }
  232 
  233 struct pgrp;
  234 struct thread;
  235 struct proc;
  236 struct sigio;
  237 struct mtx;
  238 
  239 extern int sugid_coredump;      /* Sysctl variable kern.sugid_coredump */
  240 extern struct mtx       sigio_lock;
  241 
  242 /*
  243  * Lock the pointers for a sigio object in the underlying objects of
  244  * a file descriptor.
  245  */
  246 #define SIGIO_LOCK()    mtx_lock(&sigio_lock)
  247 #define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock)
  248 #define SIGIO_UNLOCK()  mtx_unlock(&sigio_lock)
  249 #define SIGIO_LOCKED()  mtx_owned(&sigio_lock)
  250 #define SIGIO_ASSERT(type)      mtx_assert(&sigio_lock, type)
  251 
  252 /*
  253  * Machine-independent functions:
  254  */
  255 int     cursig(struct thread *td);
  256 void    execsigs(struct proc *p);
  257 void    gsignal(int pgid, int sig);
  258 void    killproc(struct proc *p, char *why);
  259 void    pgsigio(struct sigio **, int signum, int checkctty);
  260 void    pgsignal(struct pgrp *pgrp, int sig, int checkctty);
  261 void    postsig(int sig);
  262 void    psignal(struct proc *p, int sig);
  263 struct sigacts *sigacts_alloc(void);
  264 void    sigacts_copy(struct sigacts *dest, struct sigacts *src);
  265 void    sigacts_free(struct sigacts *ps);
  266 struct sigacts *sigacts_hold(struct sigacts *ps);
  267 int     sigacts_shared(struct sigacts *ps);
  268 void    sigexit(struct thread *td, int signum) __dead2;
  269 int     sig_ffs(sigset_t *set);
  270 void    siginit(struct proc *p);
  271 void    signotify(struct thread *td);
  272 void    tdsignal(struct thread *td, int sig, sigtarget_t target);
  273 void    trapsignal(struct thread *td, int sig, u_long code);
  274 int     ptracestop(struct thread *td, int sig);
  275 
  276 /*
  277  * Machine-dependent functions:
  278  */
  279 void    sendsig(sig_t action, int sig, sigset_t *retmask, u_long code);
  280 
  281 #endif /* _KERNEL */
  282 
  283 #endif /* !_SYS_SIGNALVAR_H_ */

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