1df8bae1dSRodney W. Grimes /* 2df8bae1dSRodney W. Grimes * Copyright (c) 1982, 1986, 1989, 1991, 1993 3df8bae1dSRodney W. Grimes * The Regents of the University of California. All rights reserved. 4df8bae1dSRodney W. Grimes * (c) UNIX System Laboratories, Inc. 5df8bae1dSRodney W. Grimes * All or some portions of this file are derived from material licensed 6df8bae1dSRodney W. Grimes * to the University of California by American Telephone and Telegraph 7df8bae1dSRodney W. Grimes * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8df8bae1dSRodney W. Grimes * the permission of UNIX System Laboratories, Inc. 9df8bae1dSRodney W. Grimes * 10df8bae1dSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 11df8bae1dSRodney W. Grimes * modification, are permitted provided that the following conditions 12df8bae1dSRodney W. Grimes * are met: 13df8bae1dSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 14df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 15df8bae1dSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 16df8bae1dSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 17df8bae1dSRodney W. Grimes * documentation and/or other materials provided with the distribution. 18df8bae1dSRodney W. Grimes * 3. All advertising materials mentioning features or use of this software 19df8bae1dSRodney W. Grimes * must display the following acknowledgement: 20df8bae1dSRodney W. Grimes * This product includes software developed by the University of 21df8bae1dSRodney W. Grimes * California, Berkeley and its contributors. 22df8bae1dSRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 23df8bae1dSRodney W. Grimes * may be used to endorse or promote products derived from this software 24df8bae1dSRodney W. Grimes * without specific prior written permission. 25df8bae1dSRodney W. Grimes * 26df8bae1dSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27df8bae1dSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28df8bae1dSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29df8bae1dSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30df8bae1dSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31df8bae1dSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32df8bae1dSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33df8bae1dSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34df8bae1dSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35df8bae1dSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36df8bae1dSRodney W. Grimes * SUCH DAMAGE. 37df8bae1dSRodney W. Grimes * 38df8bae1dSRodney W. Grimes * @(#)kern_sig.c 8.7 (Berkeley) 4/18/94 39831d27a9SDon Lewis * $Id: kern_sig.c,v 1.48 1998/10/21 16:31:38 jdp Exp $ 40df8bae1dSRodney W. Grimes */ 41df8bae1dSRodney W. Grimes 425591b823SEivind Eklund #include "opt_compat.h" 43db6a20e2SGarrett Wollman #include "opt_ktrace.h" 44db6a20e2SGarrett Wollman 45df8bae1dSRodney W. Grimes #define SIGPROP /* include signal properties table */ 46df8bae1dSRodney W. Grimes #include <sys/param.h> 47c87e2930SDavid Greenman #include <sys/kernel.h> 48d2d3e875SBruce Evans #include <sys/sysproto.h> 49df8bae1dSRodney W. Grimes #include <sys/signalvar.h> 50df8bae1dSRodney W. Grimes #include <sys/resourcevar.h> 51df8bae1dSRodney W. Grimes #include <sys/namei.h> 52df8bae1dSRodney W. Grimes #include <sys/vnode.h> 53df8bae1dSRodney W. Grimes #include <sys/proc.h> 542a024a2bSSean Eric Fagan #include <sys/pioctl.h> 55df8bae1dSRodney W. Grimes #include <sys/systm.h> 56df8bae1dSRodney W. Grimes #include <sys/acct.h> 573ac4d1efSBruce Evans #include <sys/fcntl.h> 58df8bae1dSRodney W. Grimes #include <sys/wait.h> 59df8bae1dSRodney W. Grimes #include <sys/ktrace.h> 60df8bae1dSRodney W. Grimes #include <sys/syslog.h> 61df8bae1dSRodney W. Grimes #include <sys/stat.h> 62d66a5066SPeter Wemm #include <sys/sysent.h> 63c87e2930SDavid Greenman #include <sys/sysctl.h> 64c5edb423SSean Eric Fagan #include <sys/malloc.h> 65df8bae1dSRodney W. Grimes 66df8bae1dSRodney W. Grimes #include <machine/cpu.h> 673163861cSTor Egge #ifdef SMP 683163861cSTor Egge #include <machine/smp.h> 693163861cSTor Egge #endif 70df8bae1dSRodney W. Grimes 7187b6de2bSPoul-Henning Kamp static int killpg1 __P((struct proc *cp, int signum, int pgid, int all)); 728a2d9f50SBruce Evans static void setsigvec __P((struct proc *p, int signum, struct sigaction *sa)); 7387b6de2bSPoul-Henning Kamp static void stop __P((struct proc *)); 7426f9a767SRodney W. Grimes 7557308494SJoerg Wunsch static int kern_logsigexit = 1; 7657308494SJoerg Wunsch SYSCTL_INT(_kern, KERN_LOGSIGEXIT, logsigexit, CTLFLAG_RW, &kern_logsigexit, 0, ""); 7757308494SJoerg Wunsch 78df8bae1dSRodney W. Grimes /* 79df8bae1dSRodney W. Grimes * Can process p, with pcred pc, send the signal signum to process q? 80df8bae1dSRodney W. Grimes */ 81df8bae1dSRodney W. Grimes #define CANSIGNAL(p, pc, q, signum) \ 82df8bae1dSRodney W. Grimes ((pc)->pc_ucred->cr_uid == 0 || \ 83df8bae1dSRodney W. Grimes (pc)->p_ruid == (q)->p_cred->p_ruid || \ 84df8bae1dSRodney W. Grimes (pc)->pc_ucred->cr_uid == (q)->p_cred->p_ruid || \ 85df8bae1dSRodney W. Grimes (pc)->p_ruid == (q)->p_ucred->cr_uid || \ 86df8bae1dSRodney W. Grimes (pc)->pc_ucred->cr_uid == (q)->p_ucred->cr_uid || \ 87df8bae1dSRodney W. Grimes ((signum) == SIGCONT && (q)->p_session == (p)->p_session)) 88df8bae1dSRodney W. Grimes 89831d27a9SDon Lewis /* 90831d27a9SDon Lewis * Policy -- Can real uid ruid with ucred uc send a signal to process q? 91831d27a9SDon Lewis */ 92831d27a9SDon Lewis #define CANSIGIO(ruid, uc, q) \ 93831d27a9SDon Lewis ((uc)->cr_uid == 0 || \ 94831d27a9SDon Lewis (ruid) == (q)->p_cred->p_ruid || \ 95831d27a9SDon Lewis (uc)->cr_uid == (q)->p_cred->p_ruid || \ 96831d27a9SDon Lewis (ruid) == (q)->p_ucred->cr_uid || \ 97831d27a9SDon Lewis (uc)->cr_uid == (q)->p_ucred->cr_uid) 98831d27a9SDon Lewis 9922d4b0fbSJohn Polstra int sugid_coredump; 100c87e2930SDavid Greenman SYSCTL_INT(_kern, OID_AUTO, sugid_coredump, CTLFLAG_RW, &sugid_coredump, 0, ""); 101c87e2930SDavid Greenman 102d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 103df8bae1dSRodney W. Grimes struct sigaction_args { 104df8bae1dSRodney W. Grimes int signum; 105df8bae1dSRodney W. Grimes struct sigaction *nsa; 106df8bae1dSRodney W. Grimes struct sigaction *osa; 107df8bae1dSRodney W. Grimes }; 108d2d3e875SBruce Evans #endif 109df8bae1dSRodney W. Grimes /* ARGSUSED */ 11026f9a767SRodney W. Grimes int 111cb226aaaSPoul-Henning Kamp sigaction(p, uap) 112df8bae1dSRodney W. Grimes struct proc *p; 113df8bae1dSRodney W. Grimes register struct sigaction_args *uap; 114df8bae1dSRodney W. Grimes { 115df8bae1dSRodney W. Grimes struct sigaction vec; 116df8bae1dSRodney W. Grimes register struct sigaction *sa; 117df8bae1dSRodney W. Grimes register struct sigacts *ps = p->p_sigacts; 118df8bae1dSRodney W. Grimes register int signum; 119df8bae1dSRodney W. Grimes int bit, error; 120df8bae1dSRodney W. Grimes 121df8bae1dSRodney W. Grimes signum = uap->signum; 122e6eeb36dSBruce Evans if (signum <= 0 || signum >= NSIG) 123df8bae1dSRodney W. Grimes return (EINVAL); 124df8bae1dSRodney W. Grimes sa = &vec; 125df8bae1dSRodney W. Grimes if (uap->osa) { 126df8bae1dSRodney W. Grimes sa->sa_handler = ps->ps_sigact[signum]; 127df8bae1dSRodney W. Grimes sa->sa_mask = ps->ps_catchmask[signum]; 128df8bae1dSRodney W. Grimes bit = sigmask(signum); 129df8bae1dSRodney W. Grimes sa->sa_flags = 0; 130df8bae1dSRodney W. Grimes if ((ps->ps_sigonstack & bit) != 0) 131df8bae1dSRodney W. Grimes sa->sa_flags |= SA_ONSTACK; 132df8bae1dSRodney W. Grimes if ((ps->ps_sigintr & bit) == 0) 133df8bae1dSRodney W. Grimes sa->sa_flags |= SA_RESTART; 134dedc04feSPeter Wemm if ((ps->ps_sigreset & bit) != 0) 135dedc04feSPeter Wemm sa->sa_flags |= SA_RESETHAND; 136289ccde0SPeter Wemm if ((ps->ps_signodefer & bit) != 0) 137dedc04feSPeter Wemm sa->sa_flags |= SA_NODEFER; 138289ccde0SPeter Wemm if (signum == SIGCHLD && p->p_flag & P_NOCLDSTOP) 139289ccde0SPeter Wemm sa->sa_flags |= SA_NOCLDSTOP; 140245f17d4SJoerg Wunsch if (signum == SIGCHLD && p->p_flag & P_NOCLDWAIT) 141245f17d4SJoerg Wunsch sa->sa_flags |= SA_NOCLDWAIT; 142bb56ec4aSPoul-Henning Kamp if ((error = copyout((caddr_t)sa, (caddr_t)uap->osa, 143bb56ec4aSPoul-Henning Kamp sizeof (vec)))) 144df8bae1dSRodney W. Grimes return (error); 145df8bae1dSRodney W. Grimes } 146df8bae1dSRodney W. Grimes if (uap->nsa) { 147bb56ec4aSPoul-Henning Kamp if ((error = copyin((caddr_t)uap->nsa, (caddr_t)sa, 148bb56ec4aSPoul-Henning Kamp sizeof (vec)))) 149df8bae1dSRodney W. Grimes return (error); 150e6eeb36dSBruce Evans if ((signum == SIGKILL || signum == SIGSTOP) && 151e6eeb36dSBruce Evans sa->sa_handler != SIG_DFL) 152e6eeb36dSBruce Evans return (EINVAL); 153df8bae1dSRodney W. Grimes setsigvec(p, signum, sa); 154df8bae1dSRodney W. Grimes } 155df8bae1dSRodney W. Grimes return (0); 156df8bae1dSRodney W. Grimes } 157df8bae1dSRodney W. Grimes 1588a2d9f50SBruce Evans static void 159df8bae1dSRodney W. Grimes setsigvec(p, signum, sa) 160df8bae1dSRodney W. Grimes register struct proc *p; 161df8bae1dSRodney W. Grimes int signum; 162df8bae1dSRodney W. Grimes register struct sigaction *sa; 163df8bae1dSRodney W. Grimes { 164df8bae1dSRodney W. Grimes register struct sigacts *ps = p->p_sigacts; 165df8bae1dSRodney W. Grimes register int bit; 166df8bae1dSRodney W. Grimes 167df8bae1dSRodney W. Grimes bit = sigmask(signum); 168df8bae1dSRodney W. Grimes /* 169df8bae1dSRodney W. Grimes * Change setting atomically. 170df8bae1dSRodney W. Grimes */ 171df8bae1dSRodney W. Grimes (void) splhigh(); 172df8bae1dSRodney W. Grimes ps->ps_sigact[signum] = sa->sa_handler; 173df8bae1dSRodney W. Grimes ps->ps_catchmask[signum] = sa->sa_mask &~ sigcantmask; 174df8bae1dSRodney W. Grimes if ((sa->sa_flags & SA_RESTART) == 0) 175df8bae1dSRodney W. Grimes ps->ps_sigintr |= bit; 176df8bae1dSRodney W. Grimes else 177df8bae1dSRodney W. Grimes ps->ps_sigintr &= ~bit; 178df8bae1dSRodney W. Grimes if (sa->sa_flags & SA_ONSTACK) 179df8bae1dSRodney W. Grimes ps->ps_sigonstack |= bit; 180df8bae1dSRodney W. Grimes else 181df8bae1dSRodney W. Grimes ps->ps_sigonstack &= ~bit; 182dedc04feSPeter Wemm if (sa->sa_flags & SA_RESETHAND) 183dedc04feSPeter Wemm ps->ps_sigreset |= bit; 1841e41c1b5SSteven Wallace else 185dedc04feSPeter Wemm ps->ps_sigreset &= ~bit; 186289ccde0SPeter Wemm if (sa->sa_flags & SA_NODEFER) 187289ccde0SPeter Wemm ps->ps_signodefer |= bit; 188289ccde0SPeter Wemm else 189289ccde0SPeter Wemm ps->ps_signodefer &= ~bit; 190df8bae1dSRodney W. Grimes #ifdef COMPAT_SUNOS 191df8bae1dSRodney W. Grimes if (sa->sa_flags & SA_USERTRAMP) 192df8bae1dSRodney W. Grimes ps->ps_usertramp |= bit; 193df8bae1dSRodney W. Grimes else 194df8bae1dSRodney W. Grimes ps->ps_usertramp &= ~bit; 195df8bae1dSRodney W. Grimes #endif 196df8bae1dSRodney W. Grimes if (signum == SIGCHLD) { 197df8bae1dSRodney W. Grimes if (sa->sa_flags & SA_NOCLDSTOP) 198df8bae1dSRodney W. Grimes p->p_flag |= P_NOCLDSTOP; 199df8bae1dSRodney W. Grimes else 200df8bae1dSRodney W. Grimes p->p_flag &= ~P_NOCLDSTOP; 201245f17d4SJoerg Wunsch if (sa->sa_flags & SA_NOCLDWAIT) { 202245f17d4SJoerg Wunsch /* 203245f17d4SJoerg Wunsch * Paranoia: since SA_NOCLDWAIT is implemented by 204245f17d4SJoerg Wunsch * reparenting the dying child to PID 1 (and 205245f17d4SJoerg Wunsch * trust it to reap the zombie), PID 1 itself is 206245f17d4SJoerg Wunsch * forbidden to set SA_NOCLDWAIT. 207245f17d4SJoerg Wunsch */ 208245f17d4SJoerg Wunsch if (p->p_pid == 1) 209245f17d4SJoerg Wunsch p->p_flag &= ~P_NOCLDWAIT; 210245f17d4SJoerg Wunsch else 211245f17d4SJoerg Wunsch p->p_flag |= P_NOCLDWAIT; 212245f17d4SJoerg Wunsch } else 213245f17d4SJoerg Wunsch p->p_flag &= ~P_NOCLDWAIT; 214df8bae1dSRodney W. Grimes } 215df8bae1dSRodney W. Grimes /* 216df8bae1dSRodney W. Grimes * Set bit in p_sigignore for signals that are set to SIG_IGN, 217df8bae1dSRodney W. Grimes * and for signals set to SIG_DFL where the default is to ignore. 218df8bae1dSRodney W. Grimes * However, don't put SIGCONT in p_sigignore, 219df8bae1dSRodney W. Grimes * as we have to restart the process. 220df8bae1dSRodney W. Grimes */ 221df8bae1dSRodney W. Grimes if (sa->sa_handler == SIG_IGN || 222df8bae1dSRodney W. Grimes (sigprop[signum] & SA_IGNORE && sa->sa_handler == SIG_DFL)) { 223df8bae1dSRodney W. Grimes p->p_siglist &= ~bit; /* never to be seen again */ 224df8bae1dSRodney W. Grimes if (signum != SIGCONT) 225df8bae1dSRodney W. Grimes p->p_sigignore |= bit; /* easier in psignal */ 226df8bae1dSRodney W. Grimes p->p_sigcatch &= ~bit; 227df8bae1dSRodney W. Grimes } else { 228df8bae1dSRodney W. Grimes p->p_sigignore &= ~bit; 229df8bae1dSRodney W. Grimes if (sa->sa_handler == SIG_DFL) 230df8bae1dSRodney W. Grimes p->p_sigcatch &= ~bit; 231df8bae1dSRodney W. Grimes else 232df8bae1dSRodney W. Grimes p->p_sigcatch |= bit; 233df8bae1dSRodney W. Grimes } 234df8bae1dSRodney W. Grimes (void) spl0(); 235df8bae1dSRodney W. Grimes } 236df8bae1dSRodney W. Grimes 237df8bae1dSRodney W. Grimes /* 238df8bae1dSRodney W. Grimes * Initialize signal state for process 0; 239df8bae1dSRodney W. Grimes * set to ignore signals that are ignored by default. 240df8bae1dSRodney W. Grimes */ 241df8bae1dSRodney W. Grimes void 242df8bae1dSRodney W. Grimes siginit(p) 243df8bae1dSRodney W. Grimes struct proc *p; 244df8bae1dSRodney W. Grimes { 245df8bae1dSRodney W. Grimes register int i; 246df8bae1dSRodney W. Grimes 247df8bae1dSRodney W. Grimes for (i = 0; i < NSIG; i++) 248df8bae1dSRodney W. Grimes if (sigprop[i] & SA_IGNORE && i != SIGCONT) 249df8bae1dSRodney W. Grimes p->p_sigignore |= sigmask(i); 250df8bae1dSRodney W. Grimes } 251df8bae1dSRodney W. Grimes 252df8bae1dSRodney W. Grimes /* 253df8bae1dSRodney W. Grimes * Reset signals for an exec of the specified process. 254df8bae1dSRodney W. Grimes */ 255df8bae1dSRodney W. Grimes void 256df8bae1dSRodney W. Grimes execsigs(p) 257df8bae1dSRodney W. Grimes register struct proc *p; 258df8bae1dSRodney W. Grimes { 259df8bae1dSRodney W. Grimes register struct sigacts *ps = p->p_sigacts; 260df8bae1dSRodney W. Grimes register int nc, mask; 261df8bae1dSRodney W. Grimes 262df8bae1dSRodney W. Grimes /* 263df8bae1dSRodney W. Grimes * Reset caught signals. Held signals remain held 264df8bae1dSRodney W. Grimes * through p_sigmask (unless they were caught, 265df8bae1dSRodney W. Grimes * and are now ignored by default). 266df8bae1dSRodney W. Grimes */ 267df8bae1dSRodney W. Grimes while (p->p_sigcatch) { 268df8bae1dSRodney W. Grimes nc = ffs((long)p->p_sigcatch); 269df8bae1dSRodney W. Grimes mask = sigmask(nc); 270df8bae1dSRodney W. Grimes p->p_sigcatch &= ~mask; 271df8bae1dSRodney W. Grimes if (sigprop[nc] & SA_IGNORE) { 272df8bae1dSRodney W. Grimes if (nc != SIGCONT) 273df8bae1dSRodney W. Grimes p->p_sigignore |= mask; 274df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; 275df8bae1dSRodney W. Grimes } 276df8bae1dSRodney W. Grimes ps->ps_sigact[nc] = SIG_DFL; 277df8bae1dSRodney W. Grimes } 278df8bae1dSRodney W. Grimes /* 279df8bae1dSRodney W. Grimes * Reset stack state to the user stack. 280df8bae1dSRodney W. Grimes * Clear set of signals caught on the signal stack. 281df8bae1dSRodney W. Grimes */ 282d66a5066SPeter Wemm ps->ps_sigstk.ss_flags = SS_DISABLE; 283df8bae1dSRodney W. Grimes ps->ps_sigstk.ss_size = 0; 284aa98692fSAndreas Schulz ps->ps_sigstk.ss_sp = 0; 285df8bae1dSRodney W. Grimes ps->ps_flags = 0; 286df8bae1dSRodney W. Grimes } 287df8bae1dSRodney W. Grimes 288df8bae1dSRodney W. Grimes /* 289df8bae1dSRodney W. Grimes * Manipulate signal mask. 290df8bae1dSRodney W. Grimes * Note that we receive new mask, not pointer, 291df8bae1dSRodney W. Grimes * and return old mask as return value; 292df8bae1dSRodney W. Grimes * the library stub does the rest. 293df8bae1dSRodney W. Grimes */ 294d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 295df8bae1dSRodney W. Grimes struct sigprocmask_args { 296df8bae1dSRodney W. Grimes int how; 297df8bae1dSRodney W. Grimes sigset_t mask; 298df8bae1dSRodney W. Grimes }; 299d2d3e875SBruce Evans #endif 30026f9a767SRodney W. Grimes int 301cb226aaaSPoul-Henning Kamp sigprocmask(p, uap) 302df8bae1dSRodney W. Grimes register struct proc *p; 303df8bae1dSRodney W. Grimes struct sigprocmask_args *uap; 304df8bae1dSRodney W. Grimes { 305df8bae1dSRodney W. Grimes int error = 0; 306df8bae1dSRodney W. Grimes 307cb226aaaSPoul-Henning Kamp p->p_retval[0] = p->p_sigmask; 308df8bae1dSRodney W. Grimes (void) splhigh(); 309df8bae1dSRodney W. Grimes 310df8bae1dSRodney W. Grimes switch (uap->how) { 311df8bae1dSRodney W. Grimes case SIG_BLOCK: 312df8bae1dSRodney W. Grimes p->p_sigmask |= uap->mask &~ sigcantmask; 313df8bae1dSRodney W. Grimes break; 314df8bae1dSRodney W. Grimes 315df8bae1dSRodney W. Grimes case SIG_UNBLOCK: 316df8bae1dSRodney W. Grimes p->p_sigmask &= ~uap->mask; 317df8bae1dSRodney W. Grimes break; 318df8bae1dSRodney W. Grimes 319df8bae1dSRodney W. Grimes case SIG_SETMASK: 320df8bae1dSRodney W. Grimes p->p_sigmask = uap->mask &~ sigcantmask; 321df8bae1dSRodney W. Grimes break; 322df8bae1dSRodney W. Grimes 323df8bae1dSRodney W. Grimes default: 324df8bae1dSRodney W. Grimes error = EINVAL; 325df8bae1dSRodney W. Grimes break; 326df8bae1dSRodney W. Grimes } 327df8bae1dSRodney W. Grimes (void) spl0(); 328df8bae1dSRodney W. Grimes return (error); 329df8bae1dSRodney W. Grimes } 330df8bae1dSRodney W. Grimes 331d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 332df8bae1dSRodney W. Grimes struct sigpending_args { 333df8bae1dSRodney W. Grimes int dummy; 334df8bae1dSRodney W. Grimes }; 335d2d3e875SBruce Evans #endif 336df8bae1dSRodney W. Grimes /* ARGSUSED */ 33726f9a767SRodney W. Grimes int 338cb226aaaSPoul-Henning Kamp sigpending(p, uap) 339df8bae1dSRodney W. Grimes struct proc *p; 340df8bae1dSRodney W. Grimes struct sigpending_args *uap; 341df8bae1dSRodney W. Grimes { 342df8bae1dSRodney W. Grimes 343cb226aaaSPoul-Henning Kamp p->p_retval[0] = p->p_siglist; 344df8bae1dSRodney W. Grimes return (0); 345df8bae1dSRodney W. Grimes } 346df8bae1dSRodney W. Grimes 347df8bae1dSRodney W. Grimes #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 348df8bae1dSRodney W. Grimes /* 349df8bae1dSRodney W. Grimes * Generalized interface signal handler, 4.3-compatible. 350df8bae1dSRodney W. Grimes */ 351d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 352df8bae1dSRodney W. Grimes struct osigvec_args { 353df8bae1dSRodney W. Grimes int signum; 354df8bae1dSRodney W. Grimes struct sigvec *nsv; 355df8bae1dSRodney W. Grimes struct sigvec *osv; 356df8bae1dSRodney W. Grimes }; 357d2d3e875SBruce Evans #endif 358df8bae1dSRodney W. Grimes /* ARGSUSED */ 35926f9a767SRodney W. Grimes int 360cb226aaaSPoul-Henning Kamp osigvec(p, uap) 361df8bae1dSRodney W. Grimes struct proc *p; 362df8bae1dSRodney W. Grimes register struct osigvec_args *uap; 363df8bae1dSRodney W. Grimes { 364df8bae1dSRodney W. Grimes struct sigvec vec; 365df8bae1dSRodney W. Grimes register struct sigacts *ps = p->p_sigacts; 366df8bae1dSRodney W. Grimes register struct sigvec *sv; 367df8bae1dSRodney W. Grimes register int signum; 368df8bae1dSRodney W. Grimes int bit, error; 369df8bae1dSRodney W. Grimes 370df8bae1dSRodney W. Grimes signum = uap->signum; 371e6eeb36dSBruce Evans if (signum <= 0 || signum >= NSIG) 372df8bae1dSRodney W. Grimes return (EINVAL); 373df8bae1dSRodney W. Grimes sv = &vec; 374df8bae1dSRodney W. Grimes if (uap->osv) { 375df8bae1dSRodney W. Grimes *(sig_t *)&sv->sv_handler = ps->ps_sigact[signum]; 376df8bae1dSRodney W. Grimes sv->sv_mask = ps->ps_catchmask[signum]; 377df8bae1dSRodney W. Grimes bit = sigmask(signum); 378df8bae1dSRodney W. Grimes sv->sv_flags = 0; 379df8bae1dSRodney W. Grimes if ((ps->ps_sigonstack & bit) != 0) 380df8bae1dSRodney W. Grimes sv->sv_flags |= SV_ONSTACK; 381df8bae1dSRodney W. Grimes if ((ps->ps_sigintr & bit) != 0) 382df8bae1dSRodney W. Grimes sv->sv_flags |= SV_INTERRUPT; 383289ccde0SPeter Wemm if ((ps->ps_sigreset & bit) != 0) 384289ccde0SPeter Wemm sv->sv_flags |= SV_RESETHAND; 385289ccde0SPeter Wemm if ((ps->ps_signodefer & bit) != 0) 386289ccde0SPeter Wemm sv->sv_flags |= SV_NODEFER; 387df8bae1dSRodney W. Grimes #ifndef COMPAT_SUNOS 388289ccde0SPeter Wemm if (signum == SIGCHLD && p->p_flag & P_NOCLDSTOP) 389289ccde0SPeter Wemm sv->sv_flags |= SV_NOCLDSTOP; 390df8bae1dSRodney W. Grimes #endif 391bb56ec4aSPoul-Henning Kamp if ((error = copyout((caddr_t)sv, (caddr_t)uap->osv, 392bb56ec4aSPoul-Henning Kamp sizeof (vec)))) 393df8bae1dSRodney W. Grimes return (error); 394df8bae1dSRodney W. Grimes } 395df8bae1dSRodney W. Grimes if (uap->nsv) { 396bb56ec4aSPoul-Henning Kamp if ((error = copyin((caddr_t)uap->nsv, (caddr_t)sv, 397bb56ec4aSPoul-Henning Kamp sizeof (vec)))) 398df8bae1dSRodney W. Grimes return (error); 399e6eeb36dSBruce Evans if ((signum == SIGKILL || signum == SIGSTOP) && 400e6eeb36dSBruce Evans sv->sv_handler != SIG_DFL) 401e6eeb36dSBruce Evans return (EINVAL); 402df8bae1dSRodney W. Grimes #ifdef COMPAT_SUNOS 403df8bae1dSRodney W. Grimes sv->sv_flags |= SA_USERTRAMP; 404df8bae1dSRodney W. Grimes #endif 405df8bae1dSRodney W. Grimes sv->sv_flags ^= SA_RESTART; /* opposite of SV_INTERRUPT */ 406df8bae1dSRodney W. Grimes setsigvec(p, signum, (struct sigaction *)sv); 407df8bae1dSRodney W. Grimes } 408df8bae1dSRodney W. Grimes return (0); 409df8bae1dSRodney W. Grimes } 410df8bae1dSRodney W. Grimes 411d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 412df8bae1dSRodney W. Grimes struct osigblock_args { 413df8bae1dSRodney W. Grimes int mask; 414df8bae1dSRodney W. Grimes }; 415d2d3e875SBruce Evans #endif 41626f9a767SRodney W. Grimes int 417cb226aaaSPoul-Henning Kamp osigblock(p, uap) 418df8bae1dSRodney W. Grimes register struct proc *p; 419df8bae1dSRodney W. Grimes struct osigblock_args *uap; 420df8bae1dSRodney W. Grimes { 421df8bae1dSRodney W. Grimes 422df8bae1dSRodney W. Grimes (void) splhigh(); 423cb226aaaSPoul-Henning Kamp p->p_retval[0] = p->p_sigmask; 424df8bae1dSRodney W. Grimes p->p_sigmask |= uap->mask &~ sigcantmask; 425df8bae1dSRodney W. Grimes (void) spl0(); 426df8bae1dSRodney W. Grimes return (0); 427df8bae1dSRodney W. Grimes } 428df8bae1dSRodney W. Grimes 429d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 430df8bae1dSRodney W. Grimes struct osigsetmask_args { 431df8bae1dSRodney W. Grimes int mask; 432df8bae1dSRodney W. Grimes }; 433d2d3e875SBruce Evans #endif 43426f9a767SRodney W. Grimes int 435cb226aaaSPoul-Henning Kamp osigsetmask(p, uap) 436df8bae1dSRodney W. Grimes struct proc *p; 437df8bae1dSRodney W. Grimes struct osigsetmask_args *uap; 438df8bae1dSRodney W. Grimes { 439df8bae1dSRodney W. Grimes 440df8bae1dSRodney W. Grimes (void) splhigh(); 441cb226aaaSPoul-Henning Kamp p->p_retval[0] = p->p_sigmask; 442df8bae1dSRodney W. Grimes p->p_sigmask = uap->mask &~ sigcantmask; 443df8bae1dSRodney W. Grimes (void) spl0(); 444df8bae1dSRodney W. Grimes return (0); 445df8bae1dSRodney W. Grimes } 446df8bae1dSRodney W. Grimes #endif /* COMPAT_43 || COMPAT_SUNOS */ 447df8bae1dSRodney W. Grimes 448df8bae1dSRodney W. Grimes /* 449df8bae1dSRodney W. Grimes * Suspend process until signal, providing mask to be set 450df8bae1dSRodney W. Grimes * in the meantime. Note nonstandard calling convention: 451df8bae1dSRodney W. Grimes * libc stub passes mask, not pointer, to save a copyin. 452df8bae1dSRodney W. Grimes */ 453d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 454df8bae1dSRodney W. Grimes struct sigsuspend_args { 455df8bae1dSRodney W. Grimes sigset_t mask; 456df8bae1dSRodney W. Grimes }; 457d2d3e875SBruce Evans #endif 458df8bae1dSRodney W. Grimes /* ARGSUSED */ 45926f9a767SRodney W. Grimes int 460cb226aaaSPoul-Henning Kamp sigsuspend(p, uap) 461df8bae1dSRodney W. Grimes register struct proc *p; 462df8bae1dSRodney W. Grimes struct sigsuspend_args *uap; 463df8bae1dSRodney W. Grimes { 464df8bae1dSRodney W. Grimes register struct sigacts *ps = p->p_sigacts; 465df8bae1dSRodney W. Grimes 466df8bae1dSRodney W. Grimes /* 467df8bae1dSRodney W. Grimes * When returning from sigpause, we want 468df8bae1dSRodney W. Grimes * the old mask to be restored after the 469df8bae1dSRodney W. Grimes * signal handler has finished. Thus, we 470df8bae1dSRodney W. Grimes * save it here and mark the sigacts structure 471df8bae1dSRodney W. Grimes * to indicate this. 472df8bae1dSRodney W. Grimes */ 473df8bae1dSRodney W. Grimes ps->ps_oldmask = p->p_sigmask; 474df8bae1dSRodney W. Grimes ps->ps_flags |= SAS_OLDMASK; 475df8bae1dSRodney W. Grimes p->p_sigmask = uap->mask &~ sigcantmask; 476df8bae1dSRodney W. Grimes while (tsleep((caddr_t) ps, PPAUSE|PCATCH, "pause", 0) == 0) 477df8bae1dSRodney W. Grimes /* void */; 478df8bae1dSRodney W. Grimes /* always return EINTR rather than ERESTART... */ 479df8bae1dSRodney W. Grimes return (EINTR); 480df8bae1dSRodney W. Grimes } 481df8bae1dSRodney W. Grimes 482df8bae1dSRodney W. Grimes #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 483d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 484df8bae1dSRodney W. Grimes struct osigstack_args { 485df8bae1dSRodney W. Grimes struct sigstack *nss; 486df8bae1dSRodney W. Grimes struct sigstack *oss; 487df8bae1dSRodney W. Grimes }; 488d2d3e875SBruce Evans #endif 489df8bae1dSRodney W. Grimes /* ARGSUSED */ 49026f9a767SRodney W. Grimes int 491cb226aaaSPoul-Henning Kamp osigstack(p, uap) 492df8bae1dSRodney W. Grimes struct proc *p; 493df8bae1dSRodney W. Grimes register struct osigstack_args *uap; 494df8bae1dSRodney W. Grimes { 495df8bae1dSRodney W. Grimes struct sigstack ss; 496df8bae1dSRodney W. Grimes struct sigacts *psp; 497df8bae1dSRodney W. Grimes int error = 0; 498df8bae1dSRodney W. Grimes 499df8bae1dSRodney W. Grimes psp = p->p_sigacts; 500aa98692fSAndreas Schulz ss.ss_sp = psp->ps_sigstk.ss_sp; 501d66a5066SPeter Wemm ss.ss_onstack = psp->ps_sigstk.ss_flags & SS_ONSTACK; 502df8bae1dSRodney W. Grimes if (uap->oss && (error = copyout((caddr_t)&ss, (caddr_t)uap->oss, 503df8bae1dSRodney W. Grimes sizeof (struct sigstack)))) 504df8bae1dSRodney W. Grimes return (error); 505df8bae1dSRodney W. Grimes if (uap->nss && (error = copyin((caddr_t)uap->nss, (caddr_t)&ss, 506df8bae1dSRodney W. Grimes sizeof (ss))) == 0) { 507aa98692fSAndreas Schulz psp->ps_sigstk.ss_sp = ss.ss_sp; 508df8bae1dSRodney W. Grimes psp->ps_sigstk.ss_size = 0; 509d66a5066SPeter Wemm psp->ps_sigstk.ss_flags |= ss.ss_onstack & SS_ONSTACK; 510df8bae1dSRodney W. Grimes psp->ps_flags |= SAS_ALTSTACK; 511df8bae1dSRodney W. Grimes } 512df8bae1dSRodney W. Grimes return (error); 513df8bae1dSRodney W. Grimes } 514df8bae1dSRodney W. Grimes #endif /* COMPAT_43 || COMPAT_SUNOS */ 515df8bae1dSRodney W. Grimes 516d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 517df8bae1dSRodney W. Grimes struct sigaltstack_args { 518df8bae1dSRodney W. Grimes struct sigaltstack *nss; 519df8bae1dSRodney W. Grimes struct sigaltstack *oss; 520df8bae1dSRodney W. Grimes }; 521d2d3e875SBruce Evans #endif 522df8bae1dSRodney W. Grimes /* ARGSUSED */ 52326f9a767SRodney W. Grimes int 524cb226aaaSPoul-Henning Kamp sigaltstack(p, uap) 525df8bae1dSRodney W. Grimes struct proc *p; 526df8bae1dSRodney W. Grimes register struct sigaltstack_args *uap; 527df8bae1dSRodney W. Grimes { 528df8bae1dSRodney W. Grimes struct sigacts *psp; 529df8bae1dSRodney W. Grimes struct sigaltstack ss; 530df8bae1dSRodney W. Grimes int error; 531df8bae1dSRodney W. Grimes 532df8bae1dSRodney W. Grimes psp = p->p_sigacts; 533df8bae1dSRodney W. Grimes if ((psp->ps_flags & SAS_ALTSTACK) == 0) 534d66a5066SPeter Wemm psp->ps_sigstk.ss_flags |= SS_DISABLE; 535df8bae1dSRodney W. Grimes if (uap->oss && (error = copyout((caddr_t)&psp->ps_sigstk, 536df8bae1dSRodney W. Grimes (caddr_t)uap->oss, sizeof (struct sigaltstack)))) 537df8bae1dSRodney W. Grimes return (error); 538df8bae1dSRodney W. Grimes if (uap->nss == 0) 539df8bae1dSRodney W. Grimes return (0); 540bb56ec4aSPoul-Henning Kamp if ((error = copyin((caddr_t)uap->nss, (caddr_t)&ss, sizeof (ss)))) 541df8bae1dSRodney W. Grimes return (error); 542d66a5066SPeter Wemm if (ss.ss_flags & SS_DISABLE) { 543d66a5066SPeter Wemm if (psp->ps_sigstk.ss_flags & SS_ONSTACK) 544df8bae1dSRodney W. Grimes return (EINVAL); 545df8bae1dSRodney W. Grimes psp->ps_flags &= ~SAS_ALTSTACK; 546df8bae1dSRodney W. Grimes psp->ps_sigstk.ss_flags = ss.ss_flags; 547df8bae1dSRodney W. Grimes return (0); 548df8bae1dSRodney W. Grimes } 549df8bae1dSRodney W. Grimes if (ss.ss_size < MINSIGSTKSZ) 550df8bae1dSRodney W. Grimes return (ENOMEM); 551df8bae1dSRodney W. Grimes psp->ps_flags |= SAS_ALTSTACK; 552df8bae1dSRodney W. Grimes psp->ps_sigstk= ss; 553df8bae1dSRodney W. Grimes return (0); 554df8bae1dSRodney W. Grimes } 555df8bae1dSRodney W. Grimes 556d93f860cSPoul-Henning Kamp /* 557d93f860cSPoul-Henning Kamp * Common code for kill process group/broadcast kill. 558d93f860cSPoul-Henning Kamp * cp is calling process. 559d93f860cSPoul-Henning Kamp */ 560d93f860cSPoul-Henning Kamp int 561d93f860cSPoul-Henning Kamp killpg1(cp, signum, pgid, all) 562d93f860cSPoul-Henning Kamp register struct proc *cp; 563d93f860cSPoul-Henning Kamp int signum, pgid, all; 564d93f860cSPoul-Henning Kamp { 565d93f860cSPoul-Henning Kamp register struct proc *p; 566d93f860cSPoul-Henning Kamp register struct pcred *pc = cp->p_cred; 567d93f860cSPoul-Henning Kamp struct pgrp *pgrp; 568d93f860cSPoul-Henning Kamp int nfound = 0; 569d93f860cSPoul-Henning Kamp 570d93f860cSPoul-Henning Kamp if (all) 571d93f860cSPoul-Henning Kamp /* 572d93f860cSPoul-Henning Kamp * broadcast 573d93f860cSPoul-Henning Kamp */ 574b75356e1SJeffrey Hsu for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 575d93f860cSPoul-Henning Kamp if (p->p_pid <= 1 || p->p_flag & P_SYSTEM || 576d93f860cSPoul-Henning Kamp p == cp || !CANSIGNAL(cp, pc, p, signum)) 577d93f860cSPoul-Henning Kamp continue; 578d93f860cSPoul-Henning Kamp nfound++; 579d93f860cSPoul-Henning Kamp if (signum) 580d93f860cSPoul-Henning Kamp psignal(p, signum); 581d93f860cSPoul-Henning Kamp } 582d93f860cSPoul-Henning Kamp else { 583d93f860cSPoul-Henning Kamp if (pgid == 0) 584d93f860cSPoul-Henning Kamp /* 585d93f860cSPoul-Henning Kamp * zero pgid means send to my process group. 586d93f860cSPoul-Henning Kamp */ 587d93f860cSPoul-Henning Kamp pgrp = cp->p_pgrp; 588d93f860cSPoul-Henning Kamp else { 589d93f860cSPoul-Henning Kamp pgrp = pgfind(pgid); 590d93f860cSPoul-Henning Kamp if (pgrp == NULL) 591d93f860cSPoul-Henning Kamp return (ESRCH); 592d93f860cSPoul-Henning Kamp } 593b75356e1SJeffrey Hsu for (p = pgrp->pg_members.lh_first; p != 0; 594b75356e1SJeffrey Hsu p = p->p_pglist.le_next) { 595d93f860cSPoul-Henning Kamp if (p->p_pid <= 1 || p->p_flag & P_SYSTEM || 596d93f860cSPoul-Henning Kamp p->p_stat == SZOMB || 597d93f860cSPoul-Henning Kamp !CANSIGNAL(cp, pc, p, signum)) 598d93f860cSPoul-Henning Kamp continue; 599d93f860cSPoul-Henning Kamp nfound++; 600d93f860cSPoul-Henning Kamp if (signum) 601d93f860cSPoul-Henning Kamp psignal(p, signum); 602d93f860cSPoul-Henning Kamp } 603d93f860cSPoul-Henning Kamp } 604d93f860cSPoul-Henning Kamp return (nfound ? 0 : ESRCH); 605d93f860cSPoul-Henning Kamp } 606d93f860cSPoul-Henning Kamp 607d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 608df8bae1dSRodney W. Grimes struct kill_args { 609df8bae1dSRodney W. Grimes int pid; 610df8bae1dSRodney W. Grimes int signum; 611df8bae1dSRodney W. Grimes }; 612d2d3e875SBruce Evans #endif 613df8bae1dSRodney W. Grimes /* ARGSUSED */ 61426f9a767SRodney W. Grimes int 615cb226aaaSPoul-Henning Kamp kill(cp, uap) 616df8bae1dSRodney W. Grimes register struct proc *cp; 617df8bae1dSRodney W. Grimes register struct kill_args *uap; 618df8bae1dSRodney W. Grimes { 619df8bae1dSRodney W. Grimes register struct proc *p; 620df8bae1dSRodney W. Grimes register struct pcred *pc = cp->p_cred; 621df8bae1dSRodney W. Grimes 622df8bae1dSRodney W. Grimes if ((u_int)uap->signum >= NSIG) 623df8bae1dSRodney W. Grimes return (EINVAL); 624df8bae1dSRodney W. Grimes if (uap->pid > 0) { 625df8bae1dSRodney W. Grimes /* kill single process */ 626df8bae1dSRodney W. Grimes if ((p = pfind(uap->pid)) == NULL) 627df8bae1dSRodney W. Grimes return (ESRCH); 628df8bae1dSRodney W. Grimes if (!CANSIGNAL(cp, pc, p, uap->signum)) 629df8bae1dSRodney W. Grimes return (EPERM); 630df8bae1dSRodney W. Grimes if (uap->signum) 631df8bae1dSRodney W. Grimes psignal(p, uap->signum); 632df8bae1dSRodney W. Grimes return (0); 633df8bae1dSRodney W. Grimes } 634df8bae1dSRodney W. Grimes switch (uap->pid) { 635df8bae1dSRodney W. Grimes case -1: /* broadcast signal */ 636df8bae1dSRodney W. Grimes return (killpg1(cp, uap->signum, 0, 1)); 637df8bae1dSRodney W. Grimes case 0: /* signal own process group */ 638df8bae1dSRodney W. Grimes return (killpg1(cp, uap->signum, 0, 0)); 639df8bae1dSRodney W. Grimes default: /* negative explicit process group */ 640df8bae1dSRodney W. Grimes return (killpg1(cp, uap->signum, -uap->pid, 0)); 641df8bae1dSRodney W. Grimes } 642df8bae1dSRodney W. Grimes /* NOTREACHED */ 643df8bae1dSRodney W. Grimes } 644df8bae1dSRodney W. Grimes 645df8bae1dSRodney W. Grimes #if defined(COMPAT_43) || defined(COMPAT_SUNOS) 646d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 647df8bae1dSRodney W. Grimes struct okillpg_args { 648df8bae1dSRodney W. Grimes int pgid; 649df8bae1dSRodney W. Grimes int signum; 650df8bae1dSRodney W. Grimes }; 651d2d3e875SBruce Evans #endif 652df8bae1dSRodney W. Grimes /* ARGSUSED */ 65326f9a767SRodney W. Grimes int 654cb226aaaSPoul-Henning Kamp okillpg(p, uap) 655df8bae1dSRodney W. Grimes struct proc *p; 656df8bae1dSRodney W. Grimes register struct okillpg_args *uap; 657df8bae1dSRodney W. Grimes { 658df8bae1dSRodney W. Grimes 659df8bae1dSRodney W. Grimes if ((u_int)uap->signum >= NSIG) 660df8bae1dSRodney W. Grimes return (EINVAL); 661df8bae1dSRodney W. Grimes return (killpg1(p, uap->signum, uap->pgid, 0)); 662df8bae1dSRodney W. Grimes } 663df8bae1dSRodney W. Grimes #endif /* COMPAT_43 || COMPAT_SUNOS */ 664df8bae1dSRodney W. Grimes 665df8bae1dSRodney W. Grimes /* 666df8bae1dSRodney W. Grimes * Send a signal to a process group. 667df8bae1dSRodney W. Grimes */ 668df8bae1dSRodney W. Grimes void 669df8bae1dSRodney W. Grimes gsignal(pgid, signum) 670df8bae1dSRodney W. Grimes int pgid, signum; 671df8bae1dSRodney W. Grimes { 672df8bae1dSRodney W. Grimes struct pgrp *pgrp; 673df8bae1dSRodney W. Grimes 674df8bae1dSRodney W. Grimes if (pgid && (pgrp = pgfind(pgid))) 675df8bae1dSRodney W. Grimes pgsignal(pgrp, signum, 0); 676df8bae1dSRodney W. Grimes } 677df8bae1dSRodney W. Grimes 678df8bae1dSRodney W. Grimes /* 679df8bae1dSRodney W. Grimes * Send a signal to a process group. If checktty is 1, 680df8bae1dSRodney W. Grimes * limit to members which have a controlling terminal. 681df8bae1dSRodney W. Grimes */ 682df8bae1dSRodney W. Grimes void 683df8bae1dSRodney W. Grimes pgsignal(pgrp, signum, checkctty) 684df8bae1dSRodney W. Grimes struct pgrp *pgrp; 685df8bae1dSRodney W. Grimes int signum, checkctty; 686df8bae1dSRodney W. Grimes { 687df8bae1dSRodney W. Grimes register struct proc *p; 688df8bae1dSRodney W. Grimes 689df8bae1dSRodney W. Grimes if (pgrp) 690b75356e1SJeffrey Hsu for (p = pgrp->pg_members.lh_first; p != 0; 691b75356e1SJeffrey Hsu p = p->p_pglist.le_next) 692df8bae1dSRodney W. Grimes if (checkctty == 0 || p->p_flag & P_CONTROLT) 693df8bae1dSRodney W. Grimes psignal(p, signum); 694df8bae1dSRodney W. Grimes } 695df8bae1dSRodney W. Grimes 696df8bae1dSRodney W. Grimes /* 697df8bae1dSRodney W. Grimes * Send a signal caused by a trap to the current process. 698df8bae1dSRodney W. Grimes * If it will be caught immediately, deliver it with correct code. 699df8bae1dSRodney W. Grimes * Otherwise, post it normally. 700df8bae1dSRodney W. Grimes */ 701df8bae1dSRodney W. Grimes void 702df8bae1dSRodney W. Grimes trapsignal(p, signum, code) 703df8bae1dSRodney W. Grimes struct proc *p; 704df8bae1dSRodney W. Grimes register int signum; 7058674077aSJeffrey Hsu u_long code; 706df8bae1dSRodney W. Grimes { 707df8bae1dSRodney W. Grimes register struct sigacts *ps = p->p_sigacts; 708df8bae1dSRodney W. Grimes int mask; 709df8bae1dSRodney W. Grimes 710df8bae1dSRodney W. Grimes mask = sigmask(signum); 711df8bae1dSRodney W. Grimes if ((p->p_flag & P_TRACED) == 0 && (p->p_sigcatch & mask) != 0 && 712df8bae1dSRodney W. Grimes (p->p_sigmask & mask) == 0) { 713df8bae1dSRodney W. Grimes p->p_stats->p_ru.ru_nsignals++; 714df8bae1dSRodney W. Grimes #ifdef KTRACE 715df8bae1dSRodney W. Grimes if (KTRPOINT(p, KTR_PSIG)) 716df8bae1dSRodney W. Grimes ktrpsig(p->p_tracep, signum, ps->ps_sigact[signum], 717df8bae1dSRodney W. Grimes p->p_sigmask, code); 718df8bae1dSRodney W. Grimes #endif 719d66a5066SPeter Wemm (*p->p_sysent->sv_sendsig)(ps->ps_sigact[signum], signum, 720d66a5066SPeter Wemm p->p_sigmask, code); 721289ccde0SPeter Wemm p->p_sigmask |= ps->ps_catchmask[signum] | 722289ccde0SPeter Wemm (mask & ~ps->ps_signodefer); 723dedc04feSPeter Wemm if ((ps->ps_sigreset & mask) != 0) { 724289ccde0SPeter Wemm /* 725289ccde0SPeter Wemm * See setsigvec() for origin of this code. 726289ccde0SPeter Wemm */ 727dedc04feSPeter Wemm p->p_sigcatch &= ~mask; 728dedc04feSPeter Wemm if (signum != SIGCONT && sigprop[signum] & SA_IGNORE) 729dedc04feSPeter Wemm p->p_sigignore |= mask; 730dedc04feSPeter Wemm ps->ps_sigact[signum] = SIG_DFL; 731dedc04feSPeter Wemm } 732df8bae1dSRodney W. Grimes } else { 733df8bae1dSRodney W. Grimes ps->ps_code = code; /* XXX for core dump/debugger */ 7348674077aSJeffrey Hsu ps->ps_sig = signum; /* XXX to verify code */ 735df8bae1dSRodney W. Grimes psignal(p, signum); 736df8bae1dSRodney W. Grimes } 737df8bae1dSRodney W. Grimes } 738df8bae1dSRodney W. Grimes 739df8bae1dSRodney W. Grimes /* 740df8bae1dSRodney W. Grimes * Send the signal to the process. If the signal has an action, the action 741df8bae1dSRodney W. Grimes * is usually performed by the target process rather than the caller; we add 742df8bae1dSRodney W. Grimes * the signal to the set of pending signals for the process. 743df8bae1dSRodney W. Grimes * 744df8bae1dSRodney W. Grimes * Exceptions: 745df8bae1dSRodney W. Grimes * o When a stop signal is sent to a sleeping process that takes the 746df8bae1dSRodney W. Grimes * default action, the process is stopped without awakening it. 747df8bae1dSRodney W. Grimes * o SIGCONT restarts stopped processes (or puts them back to sleep) 748df8bae1dSRodney W. Grimes * regardless of the signal action (eg, blocked or ignored). 749df8bae1dSRodney W. Grimes * 750df8bae1dSRodney W. Grimes * Other ignored signals are discarded immediately. 751df8bae1dSRodney W. Grimes */ 752df8bae1dSRodney W. Grimes void 753df8bae1dSRodney W. Grimes psignal(p, signum) 754df8bae1dSRodney W. Grimes register struct proc *p; 755df8bae1dSRodney W. Grimes register int signum; 756df8bae1dSRodney W. Grimes { 757df8bae1dSRodney W. Grimes register int s, prop; 758df8bae1dSRodney W. Grimes register sig_t action; 759df8bae1dSRodney W. Grimes int mask; 760df8bae1dSRodney W. Grimes 7612a024a2bSSean Eric Fagan if ((u_int)signum >= NSIG || signum == 0) { 7622a024a2bSSean Eric Fagan printf("psignal: signum %d\n", signum); 763df8bae1dSRodney W. Grimes panic("psignal signal number"); 7642a024a2bSSean Eric Fagan } 765df8bae1dSRodney W. Grimes mask = sigmask(signum); 766df8bae1dSRodney W. Grimes prop = sigprop[signum]; 767df8bae1dSRodney W. Grimes 768df8bae1dSRodney W. Grimes /* 7692a024a2bSSean Eric Fagan * If proc is traced, always give parent a chance; 7702a024a2bSSean Eric Fagan * if signal event is tracked by procfs, give *that* 7712a024a2bSSean Eric Fagan * a chance, as well. 772df8bae1dSRodney W. Grimes */ 7732a024a2bSSean Eric Fagan if ((p->p_flag & P_TRACED) || (p->p_stops & S_SIG)) 774df8bae1dSRodney W. Grimes action = SIG_DFL; 775df8bae1dSRodney W. Grimes else { 776df8bae1dSRodney W. Grimes /* 777df8bae1dSRodney W. Grimes * If the signal is being ignored, 778df8bae1dSRodney W. Grimes * then we forget about it immediately. 779df8bae1dSRodney W. Grimes * (Note: we don't set SIGCONT in p_sigignore, 780df8bae1dSRodney W. Grimes * and if it is set to SIG_IGN, 781df8bae1dSRodney W. Grimes * action will be SIG_DFL here.) 782df8bae1dSRodney W. Grimes */ 783df8bae1dSRodney W. Grimes if (p->p_sigignore & mask) 784df8bae1dSRodney W. Grimes return; 785df8bae1dSRodney W. Grimes if (p->p_sigmask & mask) 786df8bae1dSRodney W. Grimes action = SIG_HOLD; 787df8bae1dSRodney W. Grimes else if (p->p_sigcatch & mask) 788df8bae1dSRodney W. Grimes action = SIG_CATCH; 789df8bae1dSRodney W. Grimes else 790df8bae1dSRodney W. Grimes action = SIG_DFL; 791df8bae1dSRodney W. Grimes } 792df8bae1dSRodney W. Grimes 793df8bae1dSRodney W. Grimes if (p->p_nice > NZERO && action == SIG_DFL && (prop & SA_KILL) && 794df8bae1dSRodney W. Grimes (p->p_flag & P_TRACED) == 0) 795df8bae1dSRodney W. Grimes p->p_nice = NZERO; 796df8bae1dSRodney W. Grimes 797df8bae1dSRodney W. Grimes if (prop & SA_CONT) 798df8bae1dSRodney W. Grimes p->p_siglist &= ~stopsigmask; 799df8bae1dSRodney W. Grimes 800df8bae1dSRodney W. Grimes if (prop & SA_STOP) { 801df8bae1dSRodney W. Grimes /* 802df8bae1dSRodney W. Grimes * If sending a tty stop signal to a member of an orphaned 803df8bae1dSRodney W. Grimes * process group, discard the signal here if the action 804df8bae1dSRodney W. Grimes * is default; don't stop the process below if sleeping, 805df8bae1dSRodney W. Grimes * and don't clear any pending SIGCONT. 806df8bae1dSRodney W. Grimes */ 807df8bae1dSRodney W. Grimes if (prop & SA_TTYSTOP && p->p_pgrp->pg_jobc == 0 && 808df8bae1dSRodney W. Grimes action == SIG_DFL) 809df8bae1dSRodney W. Grimes return; 810df8bae1dSRodney W. Grimes p->p_siglist &= ~contsigmask; 811df8bae1dSRodney W. Grimes } 812df8bae1dSRodney W. Grimes p->p_siglist |= mask; 813df8bae1dSRodney W. Grimes 814df8bae1dSRodney W. Grimes /* 815df8bae1dSRodney W. Grimes * Defer further processing for signals which are held, 816df8bae1dSRodney W. Grimes * except that stopped processes must be continued by SIGCONT. 817df8bae1dSRodney W. Grimes */ 818df8bae1dSRodney W. Grimes if (action == SIG_HOLD && ((prop & SA_CONT) == 0 || p->p_stat != SSTOP)) 819df8bae1dSRodney W. Grimes return; 820df8bae1dSRodney W. Grimes s = splhigh(); 821df8bae1dSRodney W. Grimes switch (p->p_stat) { 822df8bae1dSRodney W. Grimes 823df8bae1dSRodney W. Grimes case SSLEEP: 824df8bae1dSRodney W. Grimes /* 825df8bae1dSRodney W. Grimes * If process is sleeping uninterruptibly 826df8bae1dSRodney W. Grimes * we can't interrupt the sleep... the signal will 827df8bae1dSRodney W. Grimes * be noticed when the process returns through 828df8bae1dSRodney W. Grimes * trap() or syscall(). 829df8bae1dSRodney W. Grimes */ 830df8bae1dSRodney W. Grimes if ((p->p_flag & P_SINTR) == 0) 831df8bae1dSRodney W. Grimes goto out; 832df8bae1dSRodney W. Grimes /* 833df8bae1dSRodney W. Grimes * Process is sleeping and traced... make it runnable 834df8bae1dSRodney W. Grimes * so it can discover the signal in issignal() and stop 835df8bae1dSRodney W. Grimes * for the parent. 836df8bae1dSRodney W. Grimes */ 837df8bae1dSRodney W. Grimes if (p->p_flag & P_TRACED) 838df8bae1dSRodney W. Grimes goto run; 839df8bae1dSRodney W. Grimes /* 840df8bae1dSRodney W. Grimes * If SIGCONT is default (or ignored) and process is 841df8bae1dSRodney W. Grimes * asleep, we are finished; the process should not 842df8bae1dSRodney W. Grimes * be awakened. 843df8bae1dSRodney W. Grimes */ 844df8bae1dSRodney W. Grimes if ((prop & SA_CONT) && action == SIG_DFL) { 845df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; 846df8bae1dSRodney W. Grimes goto out; 847df8bae1dSRodney W. Grimes } 848df8bae1dSRodney W. Grimes /* 849df8bae1dSRodney W. Grimes * When a sleeping process receives a stop 850df8bae1dSRodney W. Grimes * signal, process immediately if possible. 851df8bae1dSRodney W. Grimes * All other (caught or default) signals 852df8bae1dSRodney W. Grimes * cause the process to run. 853df8bae1dSRodney W. Grimes */ 854df8bae1dSRodney W. Grimes if (prop & SA_STOP) { 855df8bae1dSRodney W. Grimes if (action != SIG_DFL) 856df8bae1dSRodney W. Grimes goto runfast; 857df8bae1dSRodney W. Grimes /* 858df8bae1dSRodney W. Grimes * If a child holding parent blocked, 859df8bae1dSRodney W. Grimes * stopping could cause deadlock. 860df8bae1dSRodney W. Grimes */ 861df8bae1dSRodney W. Grimes if (p->p_flag & P_PPWAIT) 862df8bae1dSRodney W. Grimes goto out; 863df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; 864df8bae1dSRodney W. Grimes p->p_xstat = signum; 865df8bae1dSRodney W. Grimes if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0) 866df8bae1dSRodney W. Grimes psignal(p->p_pptr, SIGCHLD); 867df8bae1dSRodney W. Grimes stop(p); 868df8bae1dSRodney W. Grimes goto out; 869df8bae1dSRodney W. Grimes } else 870df8bae1dSRodney W. Grimes goto runfast; 871df8bae1dSRodney W. Grimes /*NOTREACHED*/ 872df8bae1dSRodney W. Grimes 873df8bae1dSRodney W. Grimes case SSTOP: 874df8bae1dSRodney W. Grimes /* 875df8bae1dSRodney W. Grimes * If traced process is already stopped, 876df8bae1dSRodney W. Grimes * then no further action is necessary. 877df8bae1dSRodney W. Grimes */ 878df8bae1dSRodney W. Grimes if (p->p_flag & P_TRACED) 879df8bae1dSRodney W. Grimes goto out; 880df8bae1dSRodney W. Grimes 881df8bae1dSRodney W. Grimes /* 882df8bae1dSRodney W. Grimes * Kill signal always sets processes running. 883df8bae1dSRodney W. Grimes */ 884df8bae1dSRodney W. Grimes if (signum == SIGKILL) 885df8bae1dSRodney W. Grimes goto runfast; 886df8bae1dSRodney W. Grimes 887df8bae1dSRodney W. Grimes if (prop & SA_CONT) { 888df8bae1dSRodney W. Grimes /* 889df8bae1dSRodney W. Grimes * If SIGCONT is default (or ignored), we continue the 890df8bae1dSRodney W. Grimes * process but don't leave the signal in p_siglist, as 891df8bae1dSRodney W. Grimes * it has no further action. If SIGCONT is held, we 892df8bae1dSRodney W. Grimes * continue the process and leave the signal in 893df8bae1dSRodney W. Grimes * p_siglist. If the process catches SIGCONT, let it 894df8bae1dSRodney W. Grimes * handle the signal itself. If it isn't waiting on 895df8bae1dSRodney W. Grimes * an event, then it goes back to run state. 896df8bae1dSRodney W. Grimes * Otherwise, process goes back to sleep state. 897df8bae1dSRodney W. Grimes */ 898df8bae1dSRodney W. Grimes if (action == SIG_DFL) 899df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; 900df8bae1dSRodney W. Grimes if (action == SIG_CATCH) 901df8bae1dSRodney W. Grimes goto runfast; 902df8bae1dSRodney W. Grimes if (p->p_wchan == 0) 903df8bae1dSRodney W. Grimes goto run; 904df8bae1dSRodney W. Grimes p->p_stat = SSLEEP; 905df8bae1dSRodney W. Grimes goto out; 906df8bae1dSRodney W. Grimes } 907df8bae1dSRodney W. Grimes 908df8bae1dSRodney W. Grimes if (prop & SA_STOP) { 909df8bae1dSRodney W. Grimes /* 910df8bae1dSRodney W. Grimes * Already stopped, don't need to stop again. 911df8bae1dSRodney W. Grimes * (If we did the shell could get confused.) 912df8bae1dSRodney W. Grimes */ 913df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; /* take it away */ 914df8bae1dSRodney W. Grimes goto out; 915df8bae1dSRodney W. Grimes } 916df8bae1dSRodney W. Grimes 917df8bae1dSRodney W. Grimes /* 918df8bae1dSRodney W. Grimes * If process is sleeping interruptibly, then simulate a 919df8bae1dSRodney W. Grimes * wakeup so that when it is continued, it will be made 920df8bae1dSRodney W. Grimes * runnable and can look at the signal. But don't make 921df8bae1dSRodney W. Grimes * the process runnable, leave it stopped. 922df8bae1dSRodney W. Grimes */ 923df8bae1dSRodney W. Grimes if (p->p_wchan && p->p_flag & P_SINTR) 924df8bae1dSRodney W. Grimes unsleep(p); 925df8bae1dSRodney W. Grimes goto out; 926df8bae1dSRodney W. Grimes 927df8bae1dSRodney W. Grimes default: 928df8bae1dSRodney W. Grimes /* 929df8bae1dSRodney W. Grimes * SRUN, SIDL, SZOMB do nothing with the signal, 930df8bae1dSRodney W. Grimes * other than kicking ourselves if we are running. 931df8bae1dSRodney W. Grimes * It will either never be noticed, or noticed very soon. 932df8bae1dSRodney W. Grimes */ 933df8bae1dSRodney W. Grimes if (p == curproc) 934df8bae1dSRodney W. Grimes signotify(p); 9353163861cSTor Egge #ifdef SMP 9363163861cSTor Egge else if (p->p_stat == SRUN) 9373163861cSTor Egge forward_signal(p); 9383163861cSTor Egge #endif 939df8bae1dSRodney W. Grimes goto out; 940df8bae1dSRodney W. Grimes } 941df8bae1dSRodney W. Grimes /*NOTREACHED*/ 942df8bae1dSRodney W. Grimes 943df8bae1dSRodney W. Grimes runfast: 944df8bae1dSRodney W. Grimes /* 945df8bae1dSRodney W. Grimes * Raise priority to at least PUSER. 946df8bae1dSRodney W. Grimes */ 947df8bae1dSRodney W. Grimes if (p->p_priority > PUSER) 948df8bae1dSRodney W. Grimes p->p_priority = PUSER; 949df8bae1dSRodney W. Grimes run: 950df8bae1dSRodney W. Grimes setrunnable(p); 951df8bae1dSRodney W. Grimes out: 952df8bae1dSRodney W. Grimes splx(s); 953df8bae1dSRodney W. Grimes } 954df8bae1dSRodney W. Grimes 955df8bae1dSRodney W. Grimes /* 956df8bae1dSRodney W. Grimes * If the current process has received a signal (should be caught or cause 957df8bae1dSRodney W. Grimes * termination, should interrupt current syscall), return the signal number. 958df8bae1dSRodney W. Grimes * Stop signals with default action are processed immediately, then cleared; 959df8bae1dSRodney W. Grimes * they aren't returned. This is checked after each entry to the system for 960df8bae1dSRodney W. Grimes * a syscall or trap (though this can usually be done without calling issignal 961df8bae1dSRodney W. Grimes * by checking the pending signal masks in the CURSIG macro.) The normal call 962df8bae1dSRodney W. Grimes * sequence is 963df8bae1dSRodney W. Grimes * 964df8bae1dSRodney W. Grimes * while (signum = CURSIG(curproc)) 965df8bae1dSRodney W. Grimes * postsig(signum); 966df8bae1dSRodney W. Grimes */ 96726f9a767SRodney W. Grimes int 968df8bae1dSRodney W. Grimes issignal(p) 969df8bae1dSRodney W. Grimes register struct proc *p; 970df8bae1dSRodney W. Grimes { 971df8bae1dSRodney W. Grimes register int signum, mask, prop; 972df8bae1dSRodney W. Grimes 973df8bae1dSRodney W. Grimes for (;;) { 9742a024a2bSSean Eric Fagan int traced = (p->p_flag & P_TRACED) || (p->p_stops & S_SIG); 9752a024a2bSSean Eric Fagan 976df8bae1dSRodney W. Grimes mask = p->p_siglist & ~p->p_sigmask; 977df8bae1dSRodney W. Grimes if (p->p_flag & P_PPWAIT) 978df8bae1dSRodney W. Grimes mask &= ~stopsigmask; 979df8bae1dSRodney W. Grimes if (mask == 0) /* no signal to send */ 980df8bae1dSRodney W. Grimes return (0); 981df8bae1dSRodney W. Grimes signum = ffs((long)mask); 982df8bae1dSRodney W. Grimes mask = sigmask(signum); 983df8bae1dSRodney W. Grimes prop = sigprop[signum]; 9842a024a2bSSean Eric Fagan 9852a024a2bSSean Eric Fagan STOPEVENT(p, S_SIG, signum); 9862a024a2bSSean Eric Fagan 987df8bae1dSRodney W. Grimes /* 988df8bae1dSRodney W. Grimes * We should see pending but ignored signals 989df8bae1dSRodney W. Grimes * only if P_TRACED was on when they were posted. 990df8bae1dSRodney W. Grimes */ 9912a024a2bSSean Eric Fagan if ((mask & p->p_sigignore) && (traced == 0)) { 992df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; 993df8bae1dSRodney W. Grimes continue; 994df8bae1dSRodney W. Grimes } 995df8bae1dSRodney W. Grimes if (p->p_flag & P_TRACED && (p->p_flag & P_PPWAIT) == 0) { 996df8bae1dSRodney W. Grimes /* 997df8bae1dSRodney W. Grimes * If traced, always stop, and stay 998df8bae1dSRodney W. Grimes * stopped until released by the parent. 999df8bae1dSRodney W. Grimes */ 1000df8bae1dSRodney W. Grimes p->p_xstat = signum; 1001df8bae1dSRodney W. Grimes psignal(p->p_pptr, SIGCHLD); 1002df8bae1dSRodney W. Grimes do { 1003df8bae1dSRodney W. Grimes stop(p); 1004df8bae1dSRodney W. Grimes mi_switch(); 10052a024a2bSSean Eric Fagan } while (!trace_req(p) 10062a024a2bSSean Eric Fagan && p->p_flag & P_TRACED); 1007df8bae1dSRodney W. Grimes 1008df8bae1dSRodney W. Grimes /* 1009df8bae1dSRodney W. Grimes * If the traced bit got turned off, go back up 1010df8bae1dSRodney W. Grimes * to the top to rescan signals. This ensures 1011df8bae1dSRodney W. Grimes * that p_sig* and ps_sigact are consistent. 1012df8bae1dSRodney W. Grimes */ 1013df8bae1dSRodney W. Grimes if ((p->p_flag & P_TRACED) == 0) 1014df8bae1dSRodney W. Grimes continue; 1015df8bae1dSRodney W. Grimes 1016df8bae1dSRodney W. Grimes /* 1017df8bae1dSRodney W. Grimes * If parent wants us to take the signal, 1018df8bae1dSRodney W. Grimes * then it will leave it in p->p_xstat; 1019df8bae1dSRodney W. Grimes * otherwise we just look for signals again. 1020df8bae1dSRodney W. Grimes */ 1021df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; /* clear the old signal */ 1022df8bae1dSRodney W. Grimes signum = p->p_xstat; 1023df8bae1dSRodney W. Grimes if (signum == 0) 1024df8bae1dSRodney W. Grimes continue; 1025df8bae1dSRodney W. Grimes 1026df8bae1dSRodney W. Grimes /* 1027df8bae1dSRodney W. Grimes * Put the new signal into p_siglist. If the 1028df8bae1dSRodney W. Grimes * signal is being masked, look for other signals. 1029df8bae1dSRodney W. Grimes */ 1030df8bae1dSRodney W. Grimes mask = sigmask(signum); 1031df8bae1dSRodney W. Grimes p->p_siglist |= mask; 1032df8bae1dSRodney W. Grimes if (p->p_sigmask & mask) 1033df8bae1dSRodney W. Grimes continue; 1034df8bae1dSRodney W. Grimes } 1035df8bae1dSRodney W. Grimes 1036df8bae1dSRodney W. Grimes /* 1037df8bae1dSRodney W. Grimes * Decide whether the signal should be returned. 1038df8bae1dSRodney W. Grimes * Return the signal's number, or fall through 1039df8bae1dSRodney W. Grimes * to clear it from the pending mask. 1040df8bae1dSRodney W. Grimes */ 1041a23d65bfSBruce Evans switch ((int)(intptr_t)p->p_sigacts->ps_sigact[signum]) { 1042df8bae1dSRodney W. Grimes 10430b53fbe8SBruce Evans case (int)SIG_DFL: 1044df8bae1dSRodney W. Grimes /* 1045df8bae1dSRodney W. Grimes * Don't take default actions on system processes. 1046df8bae1dSRodney W. Grimes */ 1047df8bae1dSRodney W. Grimes if (p->p_pid <= 1) { 1048df8bae1dSRodney W. Grimes #ifdef DIAGNOSTIC 1049df8bae1dSRodney W. Grimes /* 1050df8bae1dSRodney W. Grimes * Are you sure you want to ignore SIGSEGV 1051df8bae1dSRodney W. Grimes * in init? XXX 1052df8bae1dSRodney W. Grimes */ 1053d93f860cSPoul-Henning Kamp printf("Process (pid %lu) got signal %d\n", 1054d93f860cSPoul-Henning Kamp (u_long)p->p_pid, signum); 1055df8bae1dSRodney W. Grimes #endif 1056df8bae1dSRodney W. Grimes break; /* == ignore */ 1057df8bae1dSRodney W. Grimes } 1058df8bae1dSRodney W. Grimes /* 1059df8bae1dSRodney W. Grimes * If there is a pending stop signal to process 1060df8bae1dSRodney W. Grimes * with default action, stop here, 1061df8bae1dSRodney W. Grimes * then clear the signal. However, 1062df8bae1dSRodney W. Grimes * if process is member of an orphaned 1063df8bae1dSRodney W. Grimes * process group, ignore tty stop signals. 1064df8bae1dSRodney W. Grimes */ 1065df8bae1dSRodney W. Grimes if (prop & SA_STOP) { 1066df8bae1dSRodney W. Grimes if (p->p_flag & P_TRACED || 1067df8bae1dSRodney W. Grimes (p->p_pgrp->pg_jobc == 0 && 1068df8bae1dSRodney W. Grimes prop & SA_TTYSTOP)) 1069df8bae1dSRodney W. Grimes break; /* == ignore */ 1070df8bae1dSRodney W. Grimes p->p_xstat = signum; 1071df8bae1dSRodney W. Grimes stop(p); 1072df8bae1dSRodney W. Grimes if ((p->p_pptr->p_flag & P_NOCLDSTOP) == 0) 1073df8bae1dSRodney W. Grimes psignal(p->p_pptr, SIGCHLD); 1074df8bae1dSRodney W. Grimes mi_switch(); 1075df8bae1dSRodney W. Grimes break; 1076df8bae1dSRodney W. Grimes } else if (prop & SA_IGNORE) { 1077df8bae1dSRodney W. Grimes /* 1078df8bae1dSRodney W. Grimes * Except for SIGCONT, shouldn't get here. 1079df8bae1dSRodney W. Grimes * Default action is to ignore; drop it. 1080df8bae1dSRodney W. Grimes */ 1081df8bae1dSRodney W. Grimes break; /* == ignore */ 1082df8bae1dSRodney W. Grimes } else 1083df8bae1dSRodney W. Grimes return (signum); 1084df8bae1dSRodney W. Grimes /*NOTREACHED*/ 1085df8bae1dSRodney W. Grimes 10860b53fbe8SBruce Evans case (int)SIG_IGN: 1087df8bae1dSRodney W. Grimes /* 1088df8bae1dSRodney W. Grimes * Masking above should prevent us ever trying 1089df8bae1dSRodney W. Grimes * to take action on an ignored signal other 1090df8bae1dSRodney W. Grimes * than SIGCONT, unless process is traced. 1091df8bae1dSRodney W. Grimes */ 1092df8bae1dSRodney W. Grimes if ((prop & SA_CONT) == 0 && 1093df8bae1dSRodney W. Grimes (p->p_flag & P_TRACED) == 0) 1094df8bae1dSRodney W. Grimes printf("issignal\n"); 1095df8bae1dSRodney W. Grimes break; /* == ignore */ 1096df8bae1dSRodney W. Grimes 1097df8bae1dSRodney W. Grimes default: 1098df8bae1dSRodney W. Grimes /* 1099df8bae1dSRodney W. Grimes * This signal has an action, let 1100df8bae1dSRodney W. Grimes * postsig() process it. 1101df8bae1dSRodney W. Grimes */ 1102df8bae1dSRodney W. Grimes return (signum); 1103df8bae1dSRodney W. Grimes } 1104df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; /* take the signal! */ 1105df8bae1dSRodney W. Grimes } 1106df8bae1dSRodney W. Grimes /* NOTREACHED */ 1107df8bae1dSRodney W. Grimes } 1108df8bae1dSRodney W. Grimes 1109df8bae1dSRodney W. Grimes /* 1110df8bae1dSRodney W. Grimes * Put the argument process into the stopped state and notify the parent 1111df8bae1dSRodney W. Grimes * via wakeup. Signals are handled elsewhere. The process must not be 1112df8bae1dSRodney W. Grimes * on the run queue. 1113df8bae1dSRodney W. Grimes */ 111426f9a767SRodney W. Grimes void 1115df8bae1dSRodney W. Grimes stop(p) 1116df8bae1dSRodney W. Grimes register struct proc *p; 1117df8bae1dSRodney W. Grimes { 1118df8bae1dSRodney W. Grimes 1119df8bae1dSRodney W. Grimes p->p_stat = SSTOP; 1120df8bae1dSRodney W. Grimes p->p_flag &= ~P_WAITED; 1121df8bae1dSRodney W. Grimes wakeup((caddr_t)p->p_pptr); 1122df8bae1dSRodney W. Grimes } 1123df8bae1dSRodney W. Grimes 1124df8bae1dSRodney W. Grimes /* 1125df8bae1dSRodney W. Grimes * Take the action for the specified signal 1126df8bae1dSRodney W. Grimes * from the current set of pending signals. 1127df8bae1dSRodney W. Grimes */ 1128df8bae1dSRodney W. Grimes void 1129df8bae1dSRodney W. Grimes postsig(signum) 1130df8bae1dSRodney W. Grimes register int signum; 1131df8bae1dSRodney W. Grimes { 1132df8bae1dSRodney W. Grimes register struct proc *p = curproc; 1133df8bae1dSRodney W. Grimes register struct sigacts *ps = p->p_sigacts; 1134df8bae1dSRodney W. Grimes register sig_t action; 1135df8bae1dSRodney W. Grimes int code, mask, returnmask; 1136df8bae1dSRodney W. Grimes 1137df8bae1dSRodney W. Grimes #ifdef DIAGNOSTIC 1138df8bae1dSRodney W. Grimes if (signum == 0) 1139df8bae1dSRodney W. Grimes panic("postsig"); 1140df8bae1dSRodney W. Grimes #endif 1141df8bae1dSRodney W. Grimes mask = sigmask(signum); 1142df8bae1dSRodney W. Grimes p->p_siglist &= ~mask; 1143df8bae1dSRodney W. Grimes action = ps->ps_sigact[signum]; 1144df8bae1dSRodney W. Grimes #ifdef KTRACE 1145df8bae1dSRodney W. Grimes if (KTRPOINT(p, KTR_PSIG)) 1146df8bae1dSRodney W. Grimes ktrpsig(p->p_tracep, 1147df8bae1dSRodney W. Grimes signum, action, ps->ps_flags & SAS_OLDMASK ? 1148df8bae1dSRodney W. Grimes ps->ps_oldmask : p->p_sigmask, 0); 1149df8bae1dSRodney W. Grimes #endif 11502a024a2bSSean Eric Fagan STOPEVENT(p, S_SIG, signum); 11512a024a2bSSean Eric Fagan 1152df8bae1dSRodney W. Grimes if (action == SIG_DFL) { 1153df8bae1dSRodney W. Grimes /* 1154df8bae1dSRodney W. Grimes * Default action, where the default is to kill 1155df8bae1dSRodney W. Grimes * the process. (Other cases were ignored above.) 1156df8bae1dSRodney W. Grimes */ 1157df8bae1dSRodney W. Grimes sigexit(p, signum); 1158df8bae1dSRodney W. Grimes /* NOTREACHED */ 1159df8bae1dSRodney W. Grimes } else { 1160df8bae1dSRodney W. Grimes /* 1161df8bae1dSRodney W. Grimes * If we get here, the signal must be caught. 1162df8bae1dSRodney W. Grimes */ 1163df8bae1dSRodney W. Grimes #ifdef DIAGNOSTIC 1164df8bae1dSRodney W. Grimes if (action == SIG_IGN || (p->p_sigmask & mask)) 1165df8bae1dSRodney W. Grimes panic("postsig action"); 1166df8bae1dSRodney W. Grimes #endif 1167df8bae1dSRodney W. Grimes /* 1168df8bae1dSRodney W. Grimes * Set the new mask value and also defer further 1169df8bae1dSRodney W. Grimes * occurences of this signal. 1170df8bae1dSRodney W. Grimes * 1171df8bae1dSRodney W. Grimes * Special case: user has done a sigpause. Here the 1172df8bae1dSRodney W. Grimes * current mask is not of interest, but rather the 1173df8bae1dSRodney W. Grimes * mask from before the sigpause is what we want 1174df8bae1dSRodney W. Grimes * restored after the signal processing is completed. 1175df8bae1dSRodney W. Grimes */ 1176df8bae1dSRodney W. Grimes (void) splhigh(); 1177df8bae1dSRodney W. Grimes if (ps->ps_flags & SAS_OLDMASK) { 1178df8bae1dSRodney W. Grimes returnmask = ps->ps_oldmask; 1179df8bae1dSRodney W. Grimes ps->ps_flags &= ~SAS_OLDMASK; 1180df8bae1dSRodney W. Grimes } else 1181df8bae1dSRodney W. Grimes returnmask = p->p_sigmask; 1182289ccde0SPeter Wemm p->p_sigmask |= ps->ps_catchmask[signum] | 1183289ccde0SPeter Wemm (mask & ~ps->ps_signodefer); 1184dedc04feSPeter Wemm if ((ps->ps_sigreset & mask) != 0) { 1185289ccde0SPeter Wemm /* 1186289ccde0SPeter Wemm * See setsigvec() for origin of this code. 1187289ccde0SPeter Wemm */ 1188dedc04feSPeter Wemm p->p_sigcatch &= ~mask; 1189dedc04feSPeter Wemm if (signum != SIGCONT && sigprop[signum] & SA_IGNORE) 1190dedc04feSPeter Wemm p->p_sigignore |= mask; 1191dedc04feSPeter Wemm ps->ps_sigact[signum] = SIG_DFL; 1192dedc04feSPeter Wemm } 1193df8bae1dSRodney W. Grimes (void) spl0(); 1194df8bae1dSRodney W. Grimes p->p_stats->p_ru.ru_nsignals++; 1195df8bae1dSRodney W. Grimes if (ps->ps_sig != signum) { 1196df8bae1dSRodney W. Grimes code = 0; 1197df8bae1dSRodney W. Grimes } else { 1198df8bae1dSRodney W. Grimes code = ps->ps_code; 1199df8bae1dSRodney W. Grimes ps->ps_code = 0; 12008674077aSJeffrey Hsu ps->ps_sig = 0; 1201df8bae1dSRodney W. Grimes } 1202d66a5066SPeter Wemm (*p->p_sysent->sv_sendsig)(action, signum, returnmask, code); 1203df8bae1dSRodney W. Grimes } 1204df8bae1dSRodney W. Grimes } 1205df8bae1dSRodney W. Grimes 1206df8bae1dSRodney W. Grimes /* 1207df8bae1dSRodney W. Grimes * Kill the current process for stated reason. 1208df8bae1dSRodney W. Grimes */ 120926f9a767SRodney W. Grimes void 1210df8bae1dSRodney W. Grimes killproc(p, why) 1211df8bae1dSRodney W. Grimes struct proc *p; 1212df8bae1dSRodney W. Grimes char *why; 1213df8bae1dSRodney W. Grimes { 1214729b1e51SDavid Greenman log(LOG_ERR, "pid %d (%s), uid %d, was killed: %s\n", p->p_pid, p->p_comm, 1215729b1e51SDavid Greenman p->p_cred && p->p_ucred ? p->p_ucred->cr_uid : -1, why); 1216df8bae1dSRodney W. Grimes psignal(p, SIGKILL); 1217df8bae1dSRodney W. Grimes } 1218df8bae1dSRodney W. Grimes 1219df8bae1dSRodney W. Grimes /* 1220df8bae1dSRodney W. Grimes * Force the current process to exit with the specified signal, dumping core 1221df8bae1dSRodney W. Grimes * if appropriate. We bypass the normal tests for masked and caught signals, 1222df8bae1dSRodney W. Grimes * allowing unrecoverable failures to terminate the process without changing 1223df8bae1dSRodney W. Grimes * signal state. Mark the accounting record with the signal termination. 1224df8bae1dSRodney W. Grimes * If dumping core, save the signal number for the debugger. Calls exit and 1225df8bae1dSRodney W. Grimes * does not return. 1226df8bae1dSRodney W. Grimes */ 122726f9a767SRodney W. Grimes void 1228df8bae1dSRodney W. Grimes sigexit(p, signum) 1229df8bae1dSRodney W. Grimes register struct proc *p; 1230df8bae1dSRodney W. Grimes int signum; 1231df8bae1dSRodney W. Grimes { 1232df8bae1dSRodney W. Grimes 1233df8bae1dSRodney W. Grimes p->p_acflag |= AXSIG; 1234df8bae1dSRodney W. Grimes if (sigprop[signum] & SA_CORE) { 1235df8bae1dSRodney W. Grimes p->p_sigacts->ps_sig = signum; 1236c364e17eSAndrey A. Chernov /* 1237c364e17eSAndrey A. Chernov * Log signals which would cause core dumps 1238c364e17eSAndrey A. Chernov * (Log as LOG_INFO to appease those who don't want 1239c364e17eSAndrey A. Chernov * these messages.) 1240c364e17eSAndrey A. Chernov * XXX : Todo, as well as euid, write out ruid too 1241c364e17eSAndrey A. Chernov */ 124222d4b0fbSJohn Polstra if (p->p_sysent->sv_coredump != NULL && 124322d4b0fbSJohn Polstra (*p->p_sysent->sv_coredump)(p) == 0) 1244df8bae1dSRodney W. Grimes signum |= WCOREFLAG; 124557308494SJoerg Wunsch if (kern_logsigexit) 124657308494SJoerg Wunsch log(LOG_INFO, 124757308494SJoerg Wunsch "pid %d (%s), uid %d: exited on signal %d%s\n", 12483d1b21c6SAndrey A. Chernov p->p_pid, p->p_comm, 12493d1b21c6SAndrey A. Chernov p->p_cred && p->p_ucred ? p->p_ucred->cr_uid : -1, 12503d1b21c6SAndrey A. Chernov signum &~ WCOREFLAG, 12513d1b21c6SAndrey A. Chernov signum & WCOREFLAG ? " (core dumped)" : ""); 1252df8bae1dSRodney W. Grimes } 1253df8bae1dSRodney W. Grimes exit1(p, W_EXITCODE(0, signum)); 1254df8bae1dSRodney W. Grimes /* NOTREACHED */ 1255df8bae1dSRodney W. Grimes } 1256df8bae1dSRodney W. Grimes 1257c5edb423SSean Eric Fagan static char corefilename[MAXPATHLEN+1] = {"%N.core"}; 1258c5edb423SSean Eric Fagan SYSCTL_STRING(_kern, OID_AUTO, corefile, CTLFLAG_RW, corefilename, 1259c5edb423SSean Eric Fagan sizeof(corefilename), "process corefile name format string"); 1260c5edb423SSean Eric Fagan 1261c5edb423SSean Eric Fagan /* 1262c5edb423SSean Eric Fagan * expand_name(name, uid, pid) 1263c5edb423SSean Eric Fagan * Expand the name described in corefilename, using name, uid, and pid. 1264c5edb423SSean Eric Fagan * corefilename is a printf-like string, with three format specifiers: 1265c5edb423SSean Eric Fagan * %N name of process ("name") 1266c5edb423SSean Eric Fagan * %P process id (pid) 1267c5edb423SSean Eric Fagan * %U user id (uid) 1268c5edb423SSean Eric Fagan * For example, "%N.core" is the default; they can be disabled completely 1269c5edb423SSean Eric Fagan * by using "/dev/null", or all core files can be stored in "/cores/%U/%N-%P". 1270c5edb423SSean Eric Fagan * This is controlled by the sysctl variable kern.corefile (see above). 1271c5edb423SSean Eric Fagan */ 1272c5edb423SSean Eric Fagan 127322d4b0fbSJohn Polstra char * 1274c5edb423SSean Eric Fagan expand_name(name, uid, pid) 1275c5edb423SSean Eric Fagan const char *name; int uid; int pid; { 1276c5edb423SSean Eric Fagan char *temp; 1277c5edb423SSean Eric Fagan char buf[11]; /* Buffer for pid/uid -- max 4B */ 1278c5edb423SSean Eric Fagan int i, n; 1279c5edb423SSean Eric Fagan char *format = corefilename; 1280c5edb423SSean Eric Fagan 1281c5edb423SSean Eric Fagan temp = malloc(MAXPATHLEN + 3, M_TEMP, M_NOWAIT); 1282c5edb423SSean Eric Fagan bzero(temp, MAXPATHLEN+3); 1283c5edb423SSean Eric Fagan for (i = 0, n = 0; i < MAXPATHLEN && format[i]; i++) { 1284c5edb423SSean Eric Fagan int l; 1285c5edb423SSean Eric Fagan switch (format[i]) { 1286c5edb423SSean Eric Fagan case '%': /* Format character */ 1287c5edb423SSean Eric Fagan i++; 1288c5edb423SSean Eric Fagan switch (format[i]) { 1289c5edb423SSean Eric Fagan case '%': 1290c5edb423SSean Eric Fagan temp[n++] = '%'; 1291c5edb423SSean Eric Fagan break; 1292c5edb423SSean Eric Fagan case 'N': /* process name */ 1293c5edb423SSean Eric Fagan l = strlen(name); 1294c5edb423SSean Eric Fagan if ((n + l) > MAXPATHLEN) { 1295c5edb423SSean Eric Fagan log(LOG_ERR, "pid %d (%s), uid (%d): Path `%s%s' is too long\n", 1296c5edb423SSean Eric Fagan pid, name, uid, temp, name); 1297c5edb423SSean Eric Fagan free(temp, M_TEMP); 1298c5edb423SSean Eric Fagan return NULL; 1299c5edb423SSean Eric Fagan } 1300c5edb423SSean Eric Fagan memcpy(temp+n, name, l); 1301c5edb423SSean Eric Fagan n += l; 1302c5edb423SSean Eric Fagan break; 1303c5edb423SSean Eric Fagan case 'P': /* process id */ 1304c5edb423SSean Eric Fagan sprintf(buf, "%u", pid); 1305c5edb423SSean Eric Fagan l = strlen(buf); 1306c5edb423SSean Eric Fagan if ((n + l) > MAXPATHLEN) { 1307c5edb423SSean Eric Fagan log(LOG_ERR, "pid %d (%s), uid (%d): Path `%s%s' is too long\n", 1308c5edb423SSean Eric Fagan pid, name, uid, temp, name); 1309c5edb423SSean Eric Fagan free(temp, M_TEMP); 1310c5edb423SSean Eric Fagan return NULL; 1311c5edb423SSean Eric Fagan } 1312c5edb423SSean Eric Fagan memcpy(temp+n, buf, l); 1313c5edb423SSean Eric Fagan n += l; 1314c5edb423SSean Eric Fagan break; 1315c5edb423SSean Eric Fagan case 'U': /* user id */ 1316c5edb423SSean Eric Fagan sprintf(buf, "%u", uid); 1317c5edb423SSean Eric Fagan l = strlen(buf); 1318c5edb423SSean Eric Fagan if ((n + l) > MAXPATHLEN) { 1319c5edb423SSean Eric Fagan log(LOG_ERR, "pid %d (%s), uid (%d): Path `%s%s' is too long\n", 1320c5edb423SSean Eric Fagan pid, name, uid, temp, name); 1321c5edb423SSean Eric Fagan free(temp, M_TEMP); 1322c5edb423SSean Eric Fagan return NULL; 1323c5edb423SSean Eric Fagan } 1324c5edb423SSean Eric Fagan memcpy(temp+n, buf, l); 1325c5edb423SSean Eric Fagan n += l; 1326c5edb423SSean Eric Fagan break; 1327c5edb423SSean Eric Fagan default: 1328c5edb423SSean Eric Fagan log(LOG_ERR, "Unknown format character %c in `%s'\n", format[i], format); 1329c5edb423SSean Eric Fagan } 1330c5edb423SSean Eric Fagan break; 1331c5edb423SSean Eric Fagan default: 1332c5edb423SSean Eric Fagan temp[n++] = format[i]; 1333c5edb423SSean Eric Fagan } 1334c5edb423SSean Eric Fagan } 1335c5edb423SSean Eric Fagan return temp; 1336c5edb423SSean Eric Fagan } 1337c5edb423SSean Eric Fagan 1338df8bae1dSRodney W. Grimes /* 1339df8bae1dSRodney W. Grimes * Nonexistent system call-- signal process (may want to handle it). 1340df8bae1dSRodney W. Grimes * Flag error in case process won't see signal immediately (blocked or ignored). 1341df8bae1dSRodney W. Grimes */ 1342d2d3e875SBruce Evans #ifndef _SYS_SYSPROTO_H_ 1343df8bae1dSRodney W. Grimes struct nosys_args { 1344df8bae1dSRodney W. Grimes int dummy; 1345df8bae1dSRodney W. Grimes }; 1346d2d3e875SBruce Evans #endif 1347df8bae1dSRodney W. Grimes /* ARGSUSED */ 134826f9a767SRodney W. Grimes int 1349cb226aaaSPoul-Henning Kamp nosys(p, args) 1350df8bae1dSRodney W. Grimes struct proc *p; 1351df8bae1dSRodney W. Grimes struct nosys_args *args; 1352df8bae1dSRodney W. Grimes { 1353df8bae1dSRodney W. Grimes 1354df8bae1dSRodney W. Grimes psignal(p, SIGSYS); 1355df8bae1dSRodney W. Grimes return (EINVAL); 1356df8bae1dSRodney W. Grimes } 1357831d27a9SDon Lewis 1358831d27a9SDon Lewis /* 1359831d27a9SDon Lewis * Send a signal to a SIGIO or SIGURG to a process or process group using 1360831d27a9SDon Lewis * stored credentials rather than those of the current process. 1361831d27a9SDon Lewis */ 1362831d27a9SDon Lewis void 1363831d27a9SDon Lewis pgsigio(sigio, signum, checkctty) 1364831d27a9SDon Lewis struct sigio *sigio; 1365831d27a9SDon Lewis int signum, checkctty; 1366831d27a9SDon Lewis { 1367831d27a9SDon Lewis if (sigio == NULL) 1368831d27a9SDon Lewis return; 1369831d27a9SDon Lewis 1370831d27a9SDon Lewis if (sigio->sio_pgid > 0) { 1371831d27a9SDon Lewis if (CANSIGIO(sigio->sio_ruid, sigio->sio_ucred, 1372831d27a9SDon Lewis sigio->sio_proc)) 1373831d27a9SDon Lewis psignal(sigio->sio_proc, signum); 1374831d27a9SDon Lewis } else if (sigio->sio_pgid < 0) { 1375831d27a9SDon Lewis struct proc *p; 1376831d27a9SDon Lewis 1377831d27a9SDon Lewis for (p = sigio->sio_pgrp->pg_members.lh_first; p != NULL; 1378831d27a9SDon Lewis p = p->p_pglist.le_next) 1379831d27a9SDon Lewis if (CANSIGIO(sigio->sio_ruid, sigio->sio_ucred, p) && 1380831d27a9SDon Lewis (checkctty == 0 || (p->p_flag & P_CONTROLT))) 1381831d27a9SDon Lewis psignal(p, signum); 1382831d27a9SDon Lewis } 1383831d27a9SDon Lewis } 1384