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 7.16 (Berkeley) 04/03/90 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 p->p_session->s_ttyp = NULL; 114 } 115 } 116 VOP_LOCK(u.u_cdir); 117 vput(u.u_cdir); 118 if (u.u_rdir) { 119 VOP_LOCK(u.u_rdir); 120 vput(u.u_rdir); 121 } 122 u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; 123 acct(); 124 #ifdef QUOTA 125 qclean(); 126 #endif 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 ruadd(p->p_ru, &u.u_cru); 171 if (p->p_cptr) /* only need this if any child is S_ZOMB */ 172 wakeup((caddr_t)&proc[1]); 173 if (PGRP_JOBC(p)) 174 p->p_pgrp->pg_jobc--; 175 for (q = p->p_cptr; q != NULL; q = nq) { 176 if (PGRP_JOBC(q)) 177 q->p_pgrp->pg_jobc--; 178 nq = q->p_osptr; 179 if (nq != NULL) 180 nq->p_ysptr = NULL; 181 if (proc[1].p_cptr) 182 proc[1].p_cptr->p_ysptr = q; 183 q->p_osptr = proc[1].p_cptr; 184 q->p_ysptr = NULL; 185 proc[1].p_cptr = q; 186 187 q->p_pptr = &proc[1]; 188 q->p_ppid = 1; 189 /* 190 * Traced processes are killed 191 * since their existence means someone is screwing up. 192 * Stopped processes are sent a hangup and a continue. 193 * This is designed to be ``safe'' for setuid 194 * processes since they must be willing to tolerate 195 * hangups anyways. 196 */ 197 if (q->p_flag&STRC) { 198 q->p_flag &= ~STRC; 199 psignal(q, SIGKILL); 200 } else if (q->p_stat == SSTOP) { 201 psignal(q, SIGHUP); 202 psignal(q, SIGCONT); 203 } 204 /* 205 * Protect this process from future 206 * tty signals, clear TSTP/TTIN/TTOU if pending. 207 */ 208 (void) spgrp(q); 209 } 210 p->p_cptr = NULL; 211 psignal(p->p_pptr, SIGCHLD); 212 wakeup((caddr_t)p->p_pptr); 213 #if defined(tahoe) 214 dkeyrelease(p->p_dkey), p->p_dkey = 0; 215 ckeyrelease(p->p_ckey), p->p_ckey = 0; 216 u.u_pcb.pcb_savacc.faddr = (float *)NULL; 217 #endif 218 swtch(); 219 } 220 221 #ifdef COMPAT_43 222 owait() 223 { 224 register struct a { 225 int pid; 226 int *status; 227 int options; 228 struct rusage *rusage; 229 int compat; 230 } *uap = (struct a *)u.u_ap; 231 232 if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) { 233 uap->options = 0; 234 uap->rusage = 0; 235 } else { 236 uap->options = u.u_ar0[R0]; 237 uap->rusage = (struct rusage *)u.u_ar0[R1]; 238 } 239 uap->pid = WAIT_ANY; 240 uap->status = 0; 241 uap->compat = 1; 242 u.u_error = wait1(); 243 } 244 245 wait4() 246 { 247 register struct a { 248 int pid; 249 int *status; 250 int options; 251 struct rusage *rusage; 252 int compat; 253 } *uap = (struct a *)u.u_ap; 254 255 uap->compat = 0; 256 u.u_error = wait1(); 257 } 258 #else 259 #define wait1 wait4 260 #endif 261 262 /* 263 * Wait system call. 264 * Search for a terminated (zombie) child, 265 * finally lay it to rest, and collect its status. 266 * Look also for stopped (traced) children, 267 * and pass back status from them. 268 */ 269 wait1() 270 { 271 register struct a { 272 int pid; 273 int *status; 274 int options; 275 struct rusage *rusage; 276 #ifdef COMPAT_43 277 int compat; 278 #endif 279 } *uap = (struct a *)u.u_ap; 280 register f; 281 register struct proc *p, *q; 282 int status, error; 283 284 q = u.u_procp; 285 if (uap->pid == 0) 286 uap->pid = -q->p_pgid; 287 #ifdef notyet 288 if (uap->options &~ (WUNTRACED|WNOHANG)) 289 return (EINVAL); 290 #endif 291 loop: 292 f = 0; 293 for (p = q->p_cptr; p; p = p->p_osptr) { 294 if (uap->pid != WAIT_ANY && 295 p->p_pid != uap->pid && p->p_pgid != -uap->pid) 296 continue; 297 f++; 298 if (p->p_stat == SZOMB) { 299 u.u_r.r_val1 = p->p_pid; 300 #ifdef COMPAT_43 301 if (uap->compat) 302 u.u_r.r_val2 = p->p_xstat; 303 else 304 #endif 305 if (uap->status) { 306 status = p->p_xstat; /* convert to int */ 307 if (error = copyout((caddr_t)&status, 308 (caddr_t)uap->status, sizeof(status))) 309 return (error); 310 } 311 if (uap->rusage && (error = copyout((caddr_t)p->p_ru, 312 (caddr_t)uap->rusage, sizeof (struct rusage)))) 313 return (error); 314 pgrm(p); /* off pgrp */ 315 p->p_xstat = 0; 316 ruadd(&u.u_cru, p->p_ru); 317 FREE(p->p_ru, M_ZOMBIE); 318 p->p_ru = 0; 319 p->p_stat = NULL; 320 p->p_pid = 0; 321 p->p_ppid = 0; 322 if (*p->p_prev = p->p_nxt) /* off zombproc */ 323 p->p_nxt->p_prev = p->p_prev; 324 p->p_nxt = freeproc; /* onto freeproc */ 325 freeproc = p; 326 if (q = p->p_ysptr) 327 q->p_osptr = p->p_osptr; 328 if (q = p->p_osptr) 329 q->p_ysptr = p->p_ysptr; 330 if ((q = p->p_pptr)->p_cptr == p) 331 q->p_cptr = p->p_osptr; 332 p->p_pptr = 0; 333 p->p_ysptr = 0; 334 p->p_osptr = 0; 335 p->p_cptr = 0; 336 p->p_sig = 0; 337 p->p_sigcatch = 0; 338 p->p_sigignore = 0; 339 p->p_sigmask = 0; 340 /*p->p_pgrp = 0;*/ 341 p->p_flag = 0; 342 p->p_wchan = 0; 343 p->p_cursig = 0; 344 return (0); 345 } 346 if (p->p_stat == SSTOP && (p->p_flag & SWTED) == 0 && 347 (p->p_flag & STRC || uap->options & WUNTRACED)) { 348 p->p_flag |= SWTED; 349 u.u_r.r_val1 = p->p_pid; 350 #ifdef COMPAT_43 351 if (uap->compat) { 352 u.u_r.r_val2 = W_STOPCODE(p->p_cursig); 353 error = 0; 354 } else 355 #endif 356 if (uap->status) { 357 status = W_STOPCODE(p->p_cursig); 358 error = copyout((caddr_t)&status, 359 (caddr_t)uap->status, sizeof(status)); 360 } else 361 error = 0; 362 return (error); 363 } 364 } 365 if (f == 0) 366 return (ECHILD); 367 if (uap->options & WNOHANG) { 368 u.u_r.r_val1 = 0; 369 return (0); 370 } 371 if (error = tsleep((caddr_t)u.u_procp, PWAIT | PCATCH, "wait", 0)) 372 return (error); 373 goto loop; 374 } 375