1 /* kern_exit.c 4.3 83/06/02 */ 2 3 #include "../machine/reg.h" 4 #include "../machine/psl.h" 5 6 #include "../h/param.h" 7 #include "../h/systm.h" 8 #include "../h/map.h" 9 #include "../h/dir.h" 10 #include "../h/user.h" 11 #include "../h/kernel.h" 12 #include "../h/proc.h" 13 #include "../h/buf.h" 14 #include "../h/wait.h" 15 #include "../h/vm.h" 16 #include "../h/file.h" 17 #include "../h/mbuf.h" 18 #include "../h/inode.h" 19 20 /* 21 * Exit system call: pass back caller's arg 22 */ 23 rexit() 24 { 25 register struct a { 26 int rval; 27 } *uap; 28 29 uap = (struct a *)u.u_ap; 30 exit((uap->rval & 0377) << 8); 31 } 32 33 /* 34 * Release resources. 35 * Save u. area for parent to look at. 36 * Enter zombie state. 37 * Wake up parent and init processes, 38 * and dispose of children. 39 */ 40 exit(rv) 41 int rv; 42 { 43 register int i; 44 register struct proc *p, *q; 45 register int x; 46 struct mbuf *m = m_getclr(M_WAIT, MT_ZOMBIE); 47 48 #ifdef PGINPROF 49 vmsizmon(); 50 #endif 51 p = u.u_procp; 52 p->p_flag &= ~(STRC|SULOCK); 53 p->p_flag |= SWEXIT; 54 p->p_sigignore = ~0; 55 p->p_cpticks = 0; 56 p->p_pctcpu = 0; 57 for (i = 0; i < NSIG; i++) 58 u.u_signal[i] = SIG_IGN; 59 untimeout(realitexpire, (caddr_t)p); 60 /* 61 * Release virtual memory. If we resulted from 62 * a vfork(), instead give the resources back to 63 * the parent. 64 */ 65 if ((p->p_flag & SVFORK) == 0) 66 vrelvm(); 67 else { 68 p->p_flag &= ~SVFORK; 69 wakeup((caddr_t)p); 70 while ((p->p_flag & SVFDONE) == 0) 71 sleep((caddr_t)p, PZERO - 1); 72 p->p_flag &= ~SVFDONE; 73 } 74 for (i = 0; i < NOFILE; i++) { 75 struct file *f; 76 int po; 77 78 f = u.u_ofile[i]; 79 u.u_ofile[i] = NULL; 80 po = u.u_pofile[i]; 81 u.u_pofile[i] = 0; 82 closef(f, po); 83 } 84 ilock(u.u_cdir); 85 iput(u.u_cdir); 86 if (u.u_rdir) { 87 ilock(u.u_rdir); 88 iput(u.u_rdir); 89 } 90 u.u_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY; 91 acct(); 92 #ifdef QUOTA 93 qclean(); 94 #endif 95 #ifdef sun 96 ctxfree(u.u_procp); 97 #endif 98 vrelpt(u.u_procp); 99 vrelu(u.u_procp, 0); 100 (void) spl5(); /* hack for mem alloc race XXX */ 101 multprog--; 102 p->p_stat = SZOMB; 103 noproc = 1; 104 i = PIDHASH(p->p_pid); 105 x = p - proc; 106 if (pidhash[i] == x) 107 pidhash[i] = p->p_idhash; 108 else { 109 for (i = pidhash[i]; i != 0; i = proc[i].p_idhash) 110 if (proc[i].p_idhash == x) { 111 proc[i].p_idhash = p->p_idhash; 112 goto done; 113 } 114 panic("exit"); 115 } 116 if (p->p_pid == 1) 117 panic("init died"); 118 done: 119 p->p_xstat = rv; 120 if (m == 0) 121 panic("exit: m_getclr"); 122 p->p_ru = mtod(m, struct rusage *); 123 *p->p_ru = u.u_ru; 124 ruadd(p->p_ru, &u.u_cru); 125 for (q = proc; q < procNPROC; q++) 126 if (q->p_pptr == p) { 127 if (q->p_osptr) 128 q->p_osptr->p_ysptr = q->p_ysptr; 129 if (q->p_ysptr) 130 q->p_ysptr->p_osptr = q->p_osptr; 131 if (proc[1].p_cptr) 132 proc[1].p_cptr->p_ysptr = q; 133 q->p_osptr = proc[1].p_cptr; 134 q->p_ysptr = NULL; 135 proc[1].p_cptr = q; 136 137 q->p_pptr = &proc[1]; 138 q->p_ppid = 1; 139 wakeup((caddr_t)&proc[1]); 140 /* 141 * Traced processes are killed 142 * since their existence means someone is screwing up. 143 * Stopped processes are sent a hangup and a continue. 144 * This is designed to be ``safe'' for setuid 145 * processes since they must be willing to tolerate 146 * hangups anyways. 147 */ 148 if (q->p_flag&STRC) { 149 q->p_flag &= ~STRC; 150 psignal(q, SIGKILL); 151 } else if (q->p_stat == SSTOP) { 152 psignal(q, SIGHUP); 153 psignal(q, SIGCONT); 154 } 155 /* 156 * Protect this process from future 157 * tty signals, clear TSTP/TTIN/TTOU if pending. 158 */ 159 (void) spgrp(q, -1); 160 } 161 psignal(p->p_pptr, SIGCHLD); 162 wakeup((caddr_t)p->p_pptr); 163 swtch(); 164 } 165 166 wait() 167 { 168 struct rusage ru, *rup; 169 170 if ((u.u_ar0[PS] & PSL_ALLCC) != PSL_ALLCC) { 171 u.u_error = wait1(0, (struct rusage *)0); 172 return; 173 } 174 rup = (struct rusage *)u.u_ar0[R1]; 175 u.u_error = wait1(u.u_ar0[R0], &ru); 176 if (u.u_error) 177 return; 178 (void) copyout((caddr_t)&ru, (caddr_t)rup, sizeof (struct rusage)); 179 } 180 181 /* 182 * Wait system call. 183 * Search for a terminated (zombie) child, 184 * finally lay it to rest, and collect its status. 185 * Look also for stopped (traced) children, 186 * and pass back status from them. 187 */ 188 wait1(options, ru) 189 register int options; 190 struct rusage *ru; 191 { 192 register f; 193 register struct proc *p, *q; 194 195 f = 0; 196 loop: 197 for (p = proc; p < procNPROC; p++) 198 if (p->p_pptr == u.u_procp) { 199 f++; 200 if (p->p_stat == SZOMB) { 201 u.u_r.r_val1 = p->p_pid; 202 u.u_r.r_val2 = p->p_xstat; 203 p->p_xstat = 0; 204 if (ru) 205 *ru = *p->p_ru; 206 ruadd(&u.u_cru, p->p_ru); 207 (void) m_free(dtom(p->p_ru)); 208 p->p_ru = 0; 209 p->p_stat = NULL; 210 p->p_pid = 0; 211 p->p_ppid = 0; 212 if (q = p->p_ysptr) 213 q->p_osptr = p->p_osptr; 214 if (q = p->p_osptr) 215 q->p_ysptr = p->p_ysptr; 216 if ((q = p->p_pptr)->p_cptr == p) 217 q->p_cptr = p->p_osptr; 218 p->p_pptr = 0; 219 p->p_ysptr = 0; 220 p->p_osptr = 0; 221 p->p_cptr = 0; 222 p->p_sig = 0; 223 p->p_sigcatch = 0; 224 p->p_sigignore = 0; 225 p->p_sigmask = 0; 226 p->p_pgrp = 0; 227 p->p_flag = 0; 228 p->p_wchan = 0; 229 p->p_cursig = 0; 230 return (0); 231 } 232 if (p->p_stat == SSTOP && (p->p_flag&SWTED)==0 && 233 (p->p_flag&STRC || options&WUNTRACED)) { 234 p->p_flag |= SWTED; 235 u.u_r.r_val1 = p->p_pid; 236 u.u_r.r_val2 = (p->p_cursig<<8) | WSTOPPED; 237 return (0); 238 } 239 } 240 if (f == 0) 241 return (ECHILD); 242 if (options&WNOHANG) { 243 u.u_r.r_val1 = 0; 244 return (0); 245 } 246 if ((u.u_procp->p_flag&SOUSIG) == 0 && setjmp(&u.u_qsave)) { 247 u.u_eosys = RESTARTSYS; 248 return (0); 249 } 250 sleep((caddr_t)u.u_procp, PWAIT); 251 goto loop; 252 } 253