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 */ 44 45 /* 46 * Logical process signal actions and state, needed only within the process 47 * The mapping between sigacts and proc structures is 1:1 except for rfork() 48 * processes masquerading as threads which use one structure for the whole 49 * group. All members are locked by the included mutex. The reference count 50 * and mutex must be last for the bcopy in sigacts_copy() to work. 51 */ 52 struct sigacts { 53 sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */ 54 sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */ 55 sigset_t ps_sigonstack; /* Signals to take on sigstack. */ 56 sigset_t ps_sigintr; /* Signals that interrupt syscalls. */ 57 sigset_t ps_sigreset; /* Signals that reset when caught. */ 58 sigset_t ps_signodefer; /* Signals not masked while handled. */ 59 sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */ 60 sigset_t ps_sigignore; /* Signals being ignored. */ 61 sigset_t ps_sigcatch; /* Signals being caught by user. */ 62 sigset_t ps_freebsd4; /* Signals using freebsd4 ucontext. */ 63 sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */ 64 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */ 65 int ps_flag; 66 int ps_refcnt; 67 struct mtx ps_mtx; 68 }; 69 70 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */ 71 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */ 72 #define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */ 73 74 #ifdef _KERNEL 75 76 #ifdef COMPAT_43 77 typedef struct { 78 struct osigcontext si_sc; 79 int si_signo; 80 int si_code; 81 union sigval si_value; 82 } osiginfo_t; 83 84 struct osigaction { 85 union { 86 void (*__sa_handler)(int); 87 void (*__sa_sigaction)(int, osiginfo_t *, void *); 88 } __sigaction_u; /* signal handler */ 89 osigset_t sa_mask; /* signal mask to apply */ 90 int sa_flags; /* see signal options below */ 91 }; 92 93 typedef void __osiginfohandler_t(int, osiginfo_t *, void *); 94 #endif /* COMPAT_43 */ 95 96 /* additional signal action values, used only temporarily/internally */ 97 #define SIG_CATCH ((__sighandler_t *)2) 98 /* #define SIG_HOLD ((__sighandler_t *)3) See signal.h */ 99 100 /* 101 * get signal action for process and signal; currently only for current process 102 */ 103 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)]) 104 105 #endif /* _KERNEL */ 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 struct osigevent { 203 int sigev_notify; /* Notification type */ 204 union { 205 int __sigev_signo; /* Signal number */ 206 int __sigev_notify_kqueue; 207 } __sigev_u; 208 union sigval sigev_value; /* Signal value */ 209 }; 210 211 typedef struct ksiginfo { 212 TAILQ_ENTRY(ksiginfo) ksi_link; 213 siginfo_t ksi_info; 214 int ksi_flags; 215 struct sigqueue *ksi_sigq; 216 } ksiginfo_t; 217 218 #define ksi_signo ksi_info.si_signo 219 #define ksi_errno ksi_info.si_errno 220 #define ksi_code ksi_info.si_code 221 #define ksi_pid ksi_info.si_pid 222 #define ksi_uid ksi_info.si_uid 223 #define ksi_status ksi_info.si_status 224 #define ksi_addr ksi_info.si_addr 225 #define ksi_value ksi_info.si_value 226 #define ksi_band ksi_info.si_band 227 #define ksi_trapno ksi_info.si_trapno 228 #define ksi_overrun ksi_info.si_overrun 229 #define ksi_timerid ksi_info.si_timerid 230 #define ksi_mqd ksi_info.si_mqd 231 232 /* bits for ksi_flags */ 233 #define KSI_TRAP 0x01 /* Generated by trap. */ 234 #define KSI_EXT 0x02 /* Externally managed ksi. */ 235 #define KSI_INS 0x04 /* Directly insert ksi, not the copy */ 236 #define KSI_SIGQ 0x08 /* Generated by sigqueue, might ret EGAIN. */ 237 #define KSI_HEAD 0x10 /* Insert into head, not tail. */ 238 #define KSI_COPYMASK (KSI_TRAP|KSI_SIGQ) 239 240 #define KSI_ONQ(ksi) ((ksi)->ksi_sigq != NULL) 241 242 typedef struct sigqueue { 243 sigset_t sq_signals; /* All pending signals. */ 244 sigset_t sq_kill; /* Legacy depth 1 queue. */ 245 TAILQ_HEAD(, ksiginfo) sq_list;/* Queued signal info. */ 246 struct proc *sq_proc; 247 int sq_flags; 248 } sigqueue_t; 249 250 /* Flags for ksi_flags */ 251 #define SQ_INIT 0x01 252 253 #ifdef _KERNEL 254 255 /* Return nonzero if process p has an unmasked pending signal. */ 256 #define SIGPENDING(td) \ 257 ((!SIGISEMPTY((td)->td_siglist) && \ 258 !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask)) || \ 259 (!SIGISEMPTY((td)->td_proc->p_siglist) && \ 260 !sigsetmasked(&(td)->td_proc->p_siglist, &(td)->td_sigmask))) 261 /* 262 * Return the value of the pseudo-expression ((*set & ~*mask) != 0). This 263 * is an optimized version of SIGISEMPTY() on a temporary variable 264 * containing SIGSETNAND(*set, *mask). 265 */ 266 static __inline int 267 sigsetmasked(sigset_t *set, sigset_t *mask) 268 { 269 int i; 270 271 for (i = 0; i < _SIG_WORDS; i++) { 272 if (set->__bits[i] & ~mask->__bits[i]) 273 return (0); 274 } 275 return (1); 276 } 277 278 #define ksiginfo_init(ksi) \ 279 do { \ 280 bzero(ksi, sizeof(ksiginfo_t)); \ 281 } while(0) 282 283 #define ksiginfo_init_trap(ksi) \ 284 do { \ 285 ksiginfo_t *kp = ksi; \ 286 bzero(kp, sizeof(ksiginfo_t)); \ 287 kp->ksi_flags |= KSI_TRAP; \ 288 } while(0) 289 290 static __inline void 291 ksiginfo_copy(ksiginfo_t *src, ksiginfo_t *dst) 292 { 293 (dst)->ksi_info = src->ksi_info; 294 (dst)->ksi_flags = (src->ksi_flags & KSI_COPYMASK); 295 } 296 297 static __inline void 298 ksiginfo_set_sigev(ksiginfo_t *dst, struct sigevent *sigev) 299 { 300 dst->ksi_signo = sigev->sigev_signo; 301 dst->ksi_value = sigev->sigev_value; 302 } 303 304 struct pgrp; 305 struct proc; 306 struct sigio; 307 struct thread; 308 309 /* 310 * Lock the pointers for a sigio object in the underlying objects of 311 * a file descriptor. 312 */ 313 #define SIGIO_LOCK() mtx_lock(&sigio_lock) 314 #define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock) 315 #define SIGIO_UNLOCK() mtx_unlock(&sigio_lock) 316 #define SIGIO_LOCKED() mtx_owned(&sigio_lock) 317 #define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type) 318 319 extern struct mtx sigio_lock; 320 321 /* Values for stop_allowed parameter for cursig(). */ 322 #define SIG_STOP_ALLOWED 100 323 #define SIG_STOP_NOT_ALLOWED 101 324 325 /* Flags for kern_sigprocmask(). */ 326 #define SIGPROCMASK_OLD 0x0001 327 #define SIGPROCMASK_PROC_LOCKED 0x0002 328 #define SIGPROCMASK_PS_LOCKED 0x0004 329 330 int cursig(struct thread *td, int stop_allowed); 331 void execsigs(struct proc *p); 332 void gsignal(int pgid, int sig, ksiginfo_t *ksi); 333 void killproc(struct proc *p, char *why); 334 ksiginfo_t * ksiginfo_alloc(int wait); 335 void ksiginfo_free(ksiginfo_t *ksi); 336 int pksignal(struct proc *p, int sig, ksiginfo_t *ksi); 337 void pgsigio(struct sigio **sigiop, int sig, int checkctty); 338 void pgsignal(struct pgrp *pgrp, int sig, int checkctty, ksiginfo_t *ksi); 339 int postsig(int sig); 340 void psignal(struct proc *p, int sig); 341 int ptracestop(struct thread *td, int sig); 342 void sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *retmask); 343 struct sigacts *sigacts_alloc(void); 344 void sigacts_copy(struct sigacts *dest, struct sigacts *src); 345 void sigacts_free(struct sigacts *ps); 346 struct sigacts *sigacts_hold(struct sigacts *ps); 347 int sigacts_shared(struct sigacts *ps); 348 void sigexit(struct thread *td, int sig) __dead2; 349 int sigev_findtd(struct proc *p, struct sigevent *sigev, struct thread **); 350 int sig_ffs(sigset_t *set); 351 void siginit(struct proc *p); 352 void signotify(struct thread *td); 353 void sigqueue_delete(struct sigqueue *queue, int sig); 354 void sigqueue_delete_proc(struct proc *p, int sig); 355 void sigqueue_flush(struct sigqueue *queue); 356 void sigqueue_init(struct sigqueue *queue, struct proc *p); 357 void sigqueue_take(ksiginfo_t *ksi); 358 void tdksignal(struct thread *td, int sig, ksiginfo_t *ksi); 359 int tdsendsignal(struct proc *p, struct thread *td, int sig, 360 ksiginfo_t *ksi); 361 void tdsigcleanup(struct thread *td); 362 void tdsignal(struct thread *td, int sig); 363 void trapsignal(struct thread *td, ksiginfo_t *ksi); 364 365 #endif /* _KERNEL */ 366 367 #endif /* !_SYS_SIGNALVAR_H_ */ 368