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 1.17 2007/02/03 17:05:59 corecode 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 sigset_t ps_sigmailbox; /* signals that update a mailbox */ 71 }; 72 73 /* additional signal action values, used only temporarily/internally */ 74 #define SIG_CATCH ((__sighandler_t *)2) 75 #define SIG_HOLD ((__sighandler_t *)3) 76 77 #ifdef _KERNEL 78 79 /* 80 * get signal action for process and signal; currently only for current process 81 */ 82 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 83 84 #endif 85 86 /* 87 * sigset_t manipulation macros 88 */ 89 #define SIGADDSET(set, signo) \ 90 (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo) 91 92 #define SIGDELSET(set, signo) \ 93 (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo) 94 95 #define SIGEMPTYSET(set) \ 96 do { \ 97 int __i; \ 98 for (__i = 0; __i < _SIG_WORDS; __i++) \ 99 (set).__bits[__i] = 0; \ 100 } while (0) 101 102 #define SIGFILLSET(set) \ 103 do { \ 104 int __i; \ 105 for (__i = 0; __i < _SIG_WORDS; __i++) \ 106 (set).__bits[__i] = ~(unsigned int)0; \ 107 } while (0) 108 109 #define SIGISMEMBER(set, signo) \ 110 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo)) 111 112 #define SIGISEMPTY(set) __sigisempty(&(set)) 113 #define SIGNOTEMPTY(set) (!__sigisempty(&(set))) 114 115 #define SIGSETEQ(set1, set2) __sigseteq(&(set1), &(set2)) 116 #define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2))) 117 118 #define SIGSETOR(set1, set2) \ 119 do { \ 120 int __i; \ 121 for (__i = 0; __i < _SIG_WORDS; __i++) \ 122 (set1).__bits[__i] |= (set2).__bits[__i]; \ 123 } while (0) 124 125 #define SIGSETAND(set1, set2) \ 126 do { \ 127 int __i; \ 128 for (__i = 0; __i < _SIG_WORDS; __i++) \ 129 (set1).__bits[__i] &= (set2).__bits[__i]; \ 130 } while (0) 131 132 #define SIGSETNAND(set1, set2) \ 133 do { \ 134 int __i; \ 135 for (__i = 0; __i < _SIG_WORDS; __i++) \ 136 (set1).__bits[__i] &= ~(set2).__bits[__i]; \ 137 } while (0) 138 139 #define SIG_CANTMASK(set) \ 140 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP) 141 142 #define SIG_STOPSIGMASK(set) \ 143 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \ 144 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU) 145 146 #define SIG_CONTSIGMASK(set) \ 147 SIGDELSET(set, SIGCONT) 148 149 #define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP)) 150 151 static __inline int 152 __sigisempty(sigset_t *set) 153 { 154 int i; 155 156 for (i = 0; i < _SIG_WORDS; i++) { 157 if (set->__bits[i]) 158 return (0); 159 } 160 return (1); 161 } 162 163 static __inline int 164 __sigseteq(sigset_t *set1, sigset_t *set2) 165 { 166 int i; 167 168 for (i = 0; i < _SIG_WORDS; i++) { 169 if (set1->__bits[i] != set2->__bits[i]) 170 return (0); 171 } 172 return (1); 173 } 174 175 #ifdef _KERNEL 176 177 typedef void (*proc_func_t)(struct proc *); 178 179 struct pgrp; 180 struct proc; 181 struct sigio; 182 struct vmupcall; 183 184 extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */ 185 186 /* 187 * Machine-independent functions: 188 */ 189 void check_sigacts (void); 190 void execsigs (struct proc *p); 191 void gsignal (int pgid, int sig); 192 int issignal (struct lwp *lp); 193 int iscaught (struct lwp *p); 194 void killproc (struct proc *p, char *why); 195 void pgsigio (struct sigio *, int signum, int checkctty); 196 void pgsignal (struct pgrp *pgrp, int sig, int checkctty); 197 void postsig (int sig); 198 void ksignal (struct proc *p, int sig); 199 void siginit (struct proc *p); 200 void trapsignal (struct lwp *p, int sig, u_long code); 201 static int __cursig (struct lwp *p); 202 203 /* 204 * Machine-dependent functions: 205 */ 206 void sendsig (sig_t action, int sig, sigset_t *retmask, u_long code); 207 void sendupcall (struct vmupcall *vu, int morepending); 208 int fetchupcall (struct vmupcall *vu, int morepending, void *rsp); 209 void sigexit (struct proc *p, int sig); 210 int checkpoint_signal_handler(struct proc *p); 211 212 /* 213 * Inline functions: 214 */ 215 #define CURSIG(lp) __cursig(lp) 216 #define CURSIGNB(lp) __cursignb(lp) 217 218 /* 219 * Determine signal that should be delivered to process p, the current 220 * process, 0 if none. If there is a pending stop signal with default 221 * action, the process stops in issignal(). 222 * 223 * MP SAFE 224 */ 225 static __inline 226 int 227 __cursig(struct lwp *lp) 228 { 229 struct proc *p; 230 sigset_t tmpset; 231 int r; 232 233 p = lp->lwp_proc; 234 tmpset = p->p_siglist; 235 SIGSETOR(tmpset, lp->lwp_siglist); 236 SIGSETNAND(tmpset, lp->lwp_sigmask); 237 if (!(p->p_flag & P_TRACED) && SIGISEMPTY(tmpset)) 238 return(0); 239 r = issignal(lp); 240 return(r); 241 } 242 243 static __inline 244 int 245 __cursignb(struct lwp *lp) 246 { 247 struct proc *p; 248 sigset_t tmpset; 249 250 p = lp->lwp_proc; 251 tmpset = p->p_siglist; 252 SIGSETOR(tmpset, lp->lwp_siglist); 253 SIGSETNAND(tmpset, lp->lwp_sigmask); 254 if ((!(p->p_flag & P_TRACED) && SIGISEMPTY(tmpset))) { 255 return(FALSE); 256 } 257 return (TRUE); 258 } 259 260 #endif /* _KERNEL */ 261 262 #endif /* !_SYS_SIGNALVAR_H_ */ 263