1 /* 2 * Copyright (c) 1982, 1986, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)kern_exit.c 7.18 (Berkeley) 04/27/90 18 */ 19 20 #include "param.h" 21 #include "systm.h" 22 #include "map.h" 23 #include "user.h" 24 #include "kernel.h" 25 #include "proc.h" 26 #include "buf.h" 27 #include "wait.h" 28 #include "vm.h" 29 #include "file.h" 30 #include "vnode.h" 31 #include "ioctl.h" 32 #include "tty.h" 33 #include "syslog.h" 34 #include "malloc.h" 35 36 #include "machine/reg.h" 37 #ifdef COMPAT_43 38 #include "machine/psl.h" 39 #endif 40 41 /* 42 * Exit system call: pass back caller's arg 43 */ 44 rexit() 45 { 46 struct a { 47 int rval; 48 } *uap; 49 50 uap = (struct a *)u.u_ap; 51 exit(W_EXITCODE(uap->rval, 0)); 52 } 53 54 /* 55 * Release resources. 56 * Save u. area for parent to look at. 57 * Enter zombie state. 58 * Wake up parent and init processes, 59 * and dispose of children. 60 */ 61 exit(rv) 62 int rv; 63 { 64 register int i; 65 register struct proc *p, *q, *nq; 66 register struct proc **pp; 67 68 #ifdef PGINPROF 69 vmsizmon(); 70 #endif 71 p = u.u_procp; 72 MALLOC(p->p_ru, struct rusage *, sizeof(struct rusage), 73 M_ZOMBIE, M_WAITOK); 74 p->p_flag &= ~(STRC|SULOCK); 75 p->p_flag |= SWEXIT; 76 p->p_sigignore = ~0; 77 p->p_sig = 0; 78 p->p_cpticks = 0; 79 p->p_pctcpu = 0; 80 for (i = 0; i < NSIG; i++) 81 u.u_signal[i] = SIG_IGN; 82 untimeout(realitexpire, (caddr_t)p); 83 /* 84 * Release virtual memory. If we resulted from 85 * a vfork(), instead give the resources back to 86 * the parent. 87 */ 88 if ((p->p_flag & SVFORK) == 0) 89 vrelvm(); 90 else { 91 p->p_flag &= ~SVFORK; 92 wakeup((caddr_t)p); 93 while ((p->p_flag & SVFDONE) == 0) 94 sleep((caddr_t)p, PZERO - 1); 95 p->p_flag &= ~SVFDONE; 96 } 97 for (i = 0; i <= u.u_lastfile; i++) { 98 struct file *f; 99 100 f = u.u_ofile[i]; 101 if (f) { 102 u.u_ofile[i] = NULL; 103 u.u_pofile[i] = 0; 104 (void) closef(f); 105 } 106 } 107 if (SESS_LEADER(p)) { 108 p->p_session->s_leader = 0; 109 if (p->p_session->s_ttyvp) { 110 vgoneall(p->p_session->s_ttyvp); 111 vrele(p->p_session->s_ttyvp); 112 p->p_session->s_ttyvp = NULL; 113 /* 114 * s_ttyp is not zero'd; we use this to indicate 115 * that the session once had a controlling terminal. 116 */ 117 } 118 } 119 VOP_LOCK(u.u_cdir); 120 vput(u.u_cdir); 121 if (u.u_rdir) { 122 VOP_LOCK(u.u_rdir); 123 vput(u.u_rdir); 124 } 125 u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; 126 acct(); 127 crfree(u.u_cred); 128 #ifdef KTRACE 129 /* 130 * release trace file 131 */ 132 if (p->p_tracep) 133 vrele(p->p_tracep); 134 #endif 135 /* 136 /* 137 * Freeing the user structure and kernel stack 138 * for the current process: have to run a bit longer 139 * using the pages which are about to be freed... 140 * vrelu will block memory allocation by raising ipl. 141 */ 142 vrelu(u.u_procp, 0); 143 vrelpt(u.u_procp); 144 if (*p->p_prev = p->p_nxt) /* off allproc queue */ 145 p->p_nxt->p_prev = p->p_prev; 146 if (p->p_nxt = zombproc) /* onto zombproc */ 147 p->p_nxt->p_prev = &p->p_nxt; 148 p->p_prev = &zombproc; 149 zombproc = p; 150 multprog--; 151 p->p_stat = SZOMB; 152 noproc = 1; 153 for (pp = &pidhash[PIDHASH(p->p_pid)]; *pp; pp = &(*pp)->p_hash) 154 if (*pp == p) { 155 *pp = p->p_hash; 156 goto done; 157 } 158 panic("exit"); 159 done: 160 if (p->p_pid == 1) { 161 if (p->p_dsize == 0) { 162 printf("Can't exec init (errno %d)\n", WEXITSTATUS(rv)); 163 for (;;) 164 ; 165 } else 166 panic("init died"); 167 } 168 p->p_xstat = rv; 169 *p->p_ru = u.u_ru; 170 i = splclock(); 171 p->p_ru->ru_stime = p->p_stime; 172 p->p_ru->ru_utime = p->p_utime; 173 splx(i); 174 ruadd(p->p_ru, &u.u_cru); 175 if (p->p_cptr) /* only need this if any child is S_ZOMB */ 176 wakeup((caddr_t)&proc[1]); 177 if (PGRP_JOBC(p)) 178 p->p_pgrp->pg_jobc--; 179 for (q = p->p_cptr; q != NULL; q = nq) { 180 if (PGRP_JOBC(q)) 181 q->p_pgrp->pg_jobc--; 182 nq = q->p_osptr; 183 if (nq != NULL) 184 nq->p_ysptr = NULL; 185 if (proc[1].p_cptr) 186 proc[1].p_cptr->p_ysptr = q; 187 q->p_osptr = proc[1].p_cptr; 188 q->p_ysptr = NULL; 189 proc[1].p_cptr = q; 190 191 q->p_pptr = &proc[1]; 192 q->p_ppid = 1; 193 /* 194 * Traced processes are killed 195 * since their existence means someone is screwing up. 196 * Stopped processes are sent a hangup and a continue. 197 * This is designed to be ``safe'' for setuid 198 * processes since they must be willing to tolerate 199 * hangups anyways. 200 */ 201 if (q->p_flag&STRC) { 202 q->p_flag &= ~STRC; 203 psignal(q, SIGKILL); 204 } else if (q->p_stat == SSTOP) { 205 psignal(q, SIGHUP); 206 psignal(q, SIGCONT); 207 } 208 /* 209 * Protect this process from future 210 * tty signals, clear TSTP/TTIN/TTOU if pending. 211 */ 212 (void) spgrp(q); 213 } 214 p->p_cptr = NULL; 215 psignal(p->p_pptr, SIGCHLD); 216 wakeup((caddr_t)p->p_pptr); 217 #if defined(tahoe) 218 dkeyrelease(p->p_dkey), p->p_dkey = 0; 219 ckeyrelease(p->p_ckey), p->p_ckey = 0; 220 u.u_pcb.pcb_savacc.faddr = (float *)NULL; 221 #endif 222 swtch(); 223 } 224 225 #ifdef COMPAT_43 226 owait() 227 { 228 register struct a { 229 int pid; 230 int *status; 231 int options; 232 struct rusage *rusage; 233 int compat; 234 } *uap = (struct a *)u.u_ap; 235 236 if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) { 237 uap->options = 0; 238 uap->rusage = 0; 239 } else { 240 uap->options = u.u_ar0[R0]; 241 uap->rusage = (struct rusage *)u.u_ar0[R1]; 242 } 243 uap->pid = WAIT_ANY; 244 uap->status = 0; 245 uap->compat = 1; 246 u.u_error = wait1(); 247 } 248 249 wait4() 250 { 251 register struct a { 252 int pid; 253 int *status; 254 int options; 255 struct rusage *rusage; 256 int compat; 257 } *uap = (struct a *)u.u_ap; 258 259 uap->compat = 0; 260 u.u_error = wait1(); 261 } 262 #else 263 #define wait1 wait4 264 #endif 265 266 /* 267 * Wait system call. 268 * Search for a terminated (zombie) child, 269 * finally lay it to rest, and collect its status. 270 * Look also for stopped (traced) children, 271 * and pass back status from them. 272 */ 273 wait1() 274 { 275 register struct a { 276 int pid; 277 int *status; 278 int options; 279 struct rusage *rusage; 280 #ifdef COMPAT_43 281 int compat; 282 #endif 283 } *uap = (struct a *)u.u_ap; 284 register f; 285 register struct proc *p, *q; 286 int status, error; 287 288 q = u.u_procp; 289 if (uap->pid == 0) 290 uap->pid = -q->p_pgid; 291 #ifdef notyet 292 if (uap->options &~ (WUNTRACED|WNOHANG)) 293 return (EINVAL); 294 #endif 295 loop: 296 f = 0; 297 for (p = q->p_cptr; p; p = p->p_osptr) { 298 if (uap->pid != WAIT_ANY && 299 p->p_pid != uap->pid && p->p_pgid != -uap->pid) 300 continue; 301 f++; 302 if (p->p_stat == SZOMB) { 303 u.u_r.r_val1 = p->p_pid; 304 #ifdef COMPAT_43 305 if (uap->compat) 306 u.u_r.r_val2 = p->p_xstat; 307 else 308 #endif 309 if (uap->status) { 310 status = p->p_xstat; /* convert to int */ 311 if (error = copyout((caddr_t)&status, 312 (caddr_t)uap->status, sizeof(status))) 313 return (error); 314 } 315 if (uap->rusage && (error = copyout((caddr_t)p->p_ru, 316 (caddr_t)uap->rusage, sizeof (struct rusage)))) 317 return (error); 318 pgrm(p); /* off pgrp */ 319 p->p_xstat = 0; 320 ruadd(&u.u_cru, p->p_ru); 321 FREE(p->p_ru, M_ZOMBIE); 322 p->p_ru = 0; 323 p->p_stat = NULL; 324 p->p_pid = 0; 325 p->p_ppid = 0; 326 if (*p->p_prev = p->p_nxt) /* off zombproc */ 327 p->p_nxt->p_prev = p->p_prev; 328 p->p_nxt = freeproc; /* onto freeproc */ 329 freeproc = p; 330 if (q = p->p_ysptr) 331 q->p_osptr = p->p_osptr; 332 if (q = p->p_osptr) 333 q->p_ysptr = p->p_ysptr; 334 if ((q = p->p_pptr)->p_cptr == p) 335 q->p_cptr = p->p_osptr; 336 p->p_pptr = 0; 337 p->p_ysptr = 0; 338 p->p_osptr = 0; 339 p->p_cptr = 0; 340 p->p_sig = 0; 341 p->p_sigcatch = 0; 342 p->p_sigignore = 0; 343 p->p_sigmask = 0; 344 /*p->p_pgrp = 0;*/ 345 p->p_flag = 0; 346 p->p_wchan = 0; 347 p->p_cursig = 0; 348 return (0); 349 } 350 if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 && 351 (p->p_flag & STRC || uap->options & WUNTRACED)) { 352 p->p_flag |= SWTED; 353 u.u_r.r_val1 = p->p_pid; 354 #ifdef COMPAT_43 355 if (uap->compat) { 356 u.u_r.r_val2 = W_STOPCODE(p->p_cursig); 357 error = 0; 358 } else 359 #endif 360 if (uap->status) { 361 status = W_STOPCODE(p->p_cursig); 362 error = copyout((caddr_t)&status, 363 (caddr_t)uap->status, sizeof(status)); 364 } else 365 error = 0; 366 return (error); 367 } 368 } 369 if (f == 0) 370 return (ECHILD); 371 if (uap->options & WNOHANG) { 372 u.u_r.r_val1 = 0; 373 return (0); 374 } 375 if (error = tsleep((caddr_t)u.u_procp, PWAIT | PCATCH, "wait", 0)) 376 return (error); 377 goto loop; 378 } 379