1 /* 2 * Copyright (c) 1982, 1986, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)kern_sysctl.c 7.18 (Berkeley) 08/28/91 8 */ 9 10 #include "param.h" 11 #include "proc.h" 12 #include "kinfo.h" 13 #include "ioctl.h" 14 #include "tty.h" 15 #include "buf.h" 16 #include "file.h" 17 18 #include "vm/vm.h" 19 20 #include "kinfo_proc.h" 21 22 #define snderr(e) { error = (e); goto release;} 23 extern int kinfo_doproc(), kinfo_rtable(), kinfo_vnode(), kinfo_file(); 24 extern int kinfo_meter(); 25 struct kinfo_lock kinfo_lock; 26 27 /* ARGSUSED */ 28 getkerninfo(p, uap, retval) 29 struct proc *p; 30 register struct args { 31 int op; 32 char *where; 33 int *size; 34 int arg; 35 } *uap; 36 int *retval; 37 { 38 39 int bufsize; /* max size of users buffer */ 40 int needed, locked, (*server)(), error = 0; 41 42 if (error = copyin((caddr_t)uap->size, (caddr_t)&bufsize, 43 sizeof (bufsize))) 44 goto done; 45 46 switch (ki_type(uap->op)) { 47 48 case KINFO_PROC: 49 server = kinfo_doproc; 50 break; 51 52 case KINFO_RT: 53 server = kinfo_rtable; 54 break; 55 56 case KINFO_VNODE: 57 server = kinfo_vnode; 58 break; 59 60 case KINFO_FILE: 61 server = kinfo_file; 62 break; 63 64 case KINFO_METER: 65 server = kinfo_meter; 66 break; 67 68 default: 69 error = EINVAL; 70 goto done; 71 } 72 if (uap->where == NULL || uap->size == NULL) { 73 error = (*server)(uap->op, NULL, NULL, uap->arg, &needed); 74 goto done; 75 } 76 while (kinfo_lock.kl_lock) { 77 kinfo_lock.kl_want++; 78 sleep(&kinfo_lock, PRIBIO+1); 79 kinfo_lock.kl_want--; 80 kinfo_lock.kl_locked++; 81 } 82 kinfo_lock.kl_lock++; 83 84 if (!useracc(uap->where, bufsize, B_WRITE)) 85 snderr(EFAULT); 86 if (server != kinfo_vnode) /* XXX */ 87 vslock(uap->where, bufsize); 88 locked = bufsize; 89 error = (*server)(uap->op, uap->where, &bufsize, uap->arg, &needed); 90 if (server != kinfo_vnode) /* XXX */ 91 vsunlock(uap->where, locked, B_WRITE); 92 if (error == 0) 93 error = copyout((caddr_t)&bufsize, 94 (caddr_t)uap->size, sizeof (bufsize)); 95 release: 96 kinfo_lock.kl_lock--; 97 if (kinfo_lock.kl_want) 98 wakeup(&kinfo_lock); 99 done: 100 if (!error) 101 *retval = needed; 102 return (error); 103 } 104 105 /* 106 * try over estimating by 5 procs 107 */ 108 #define KINFO_PROCSLOP (5 * sizeof (struct kinfo_proc)) 109 110 kinfo_doproc(op, where, acopysize, arg, aneeded) 111 char *where; 112 int *acopysize, *aneeded; 113 { 114 register struct proc *p; 115 register struct kinfo_proc *dp = (struct kinfo_proc *)where; 116 register needed = 0; 117 int buflen; 118 int doingzomb; 119 struct eproc eproc; 120 int error = 0; 121 122 if (where != NULL) 123 buflen = *acopysize; 124 125 p = allproc; 126 doingzomb = 0; 127 again: 128 for (; p != NULL; p = p->p_nxt) { 129 /* 130 * TODO - make more efficient (see notes below). 131 * do by session. 132 */ 133 switch (ki_op(op)) { 134 135 case KINFO_PROC_PID: 136 /* could do this with just a lookup */ 137 if (p->p_pid != (pid_t)arg) 138 continue; 139 break; 140 141 case KINFO_PROC_PGRP: 142 /* could do this by traversing pgrp */ 143 if (p->p_pgrp->pg_id != (pid_t)arg) 144 continue; 145 break; 146 147 case KINFO_PROC_TTY: 148 if ((p->p_flag&SCTTY) == 0 || 149 p->p_session->s_ttyp == NULL || 150 p->p_session->s_ttyp->t_dev != (dev_t)arg) 151 continue; 152 break; 153 154 case KINFO_PROC_UID: 155 if (p->p_ucred->cr_uid != (uid_t)arg) 156 continue; 157 break; 158 159 case KINFO_PROC_RUID: 160 if (p->p_cred->p_ruid != (uid_t)arg) 161 continue; 162 break; 163 } 164 if (where != NULL && buflen >= sizeof (struct kinfo_proc)) { 165 fill_eproc(p, &eproc); 166 if (error = copyout((caddr_t)p, &dp->kp_proc, 167 sizeof (struct proc))) 168 return (error); 169 if (error = copyout((caddr_t)&eproc, &dp->kp_eproc, 170 sizeof (eproc))) 171 return (error); 172 dp++; 173 buflen -= sizeof (struct kinfo_proc); 174 } 175 needed += sizeof (struct kinfo_proc); 176 } 177 if (doingzomb == 0) { 178 p = zombproc; 179 doingzomb++; 180 goto again; 181 } 182 if (where != NULL) 183 *acopysize = (caddr_t)dp - where; 184 else 185 needed += KINFO_PROCSLOP; 186 *aneeded = needed; 187 188 return (0); 189 } 190 191 /* 192 * Fill in an eproc structure for the specified process. 193 */ 194 void 195 fill_eproc(p, ep) 196 register struct proc *p; 197 register struct eproc *ep; 198 { 199 register struct tty *tp; 200 201 ep->e_paddr = p; 202 ep->e_sess = p->p_pgrp->pg_session; 203 ep->e_pcred = *p->p_cred; 204 ep->e_ucred = *p->p_ucred; 205 ep->e_vm = *p->p_vmspace; 206 if (p->p_pptr) 207 ep->e_ppid = p->p_pptr->p_pid; 208 else 209 ep->e_ppid = 0; 210 ep->e_pgid = p->p_pgrp->pg_id; 211 ep->e_jobc = p->p_pgrp->pg_jobc; 212 if ((p->p_flag&SCTTY) && 213 (tp = ep->e_sess->s_ttyp)) { 214 ep->e_tdev = tp->t_dev; 215 ep->e_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 216 ep->e_tsess = tp->t_session; 217 } else 218 ep->e_tdev = NODEV; 219 ep->e_flag = ep->e_sess->s_ttyvp ? EPROC_CTTY : 0; 220 if (SESS_LEADER(p)) 221 ep->e_flag |= EPROC_SLEADER; 222 if (p->p_wmesg) 223 strncpy(ep->e_wmesg, p->p_wmesg, WMESGLEN); 224 ep->e_xsize = ep->e_xrssize = 0; 225 ep->e_xccount = ep->e_xswrss = 0; 226 } 227 228 /* 229 * Get file structures. 230 */ 231 kinfo_file(op, where, acopysize, arg, aneeded) 232 register char *where; 233 int *acopysize, *aneeded; 234 { 235 int buflen, needed, error; 236 struct file *fp; 237 char *start = where; 238 239 if (where == NULL) { 240 /* 241 * overestimate by 10 files 242 */ 243 *aneeded = sizeof (filehead) + 244 (nfiles + 10) * sizeof (struct file); 245 return (0); 246 } 247 buflen = *acopysize; 248 needed = 0; 249 250 /* 251 * first copyout filehead 252 */ 253 if (buflen > sizeof (filehead)) { 254 if (error = copyout((caddr_t)&filehead, where, 255 sizeof (filehead))) 256 return (error); 257 buflen -= sizeof (filehead); 258 where += sizeof (filehead); 259 } 260 needed += sizeof (filehead); 261 262 /* 263 * followed by an array of file structures 264 */ 265 for (fp = filehead; fp != NULL; fp = fp->f_filef) { 266 if (buflen > sizeof (struct file)) { 267 if (error = copyout((caddr_t)fp, where, 268 sizeof (struct file))) 269 return (error); 270 buflen -= sizeof (struct file); 271 where += sizeof (struct file); 272 } 273 needed += sizeof (struct file); 274 } 275 *acopysize = where - start; 276 *aneeded = needed; 277 278 return (0); 279 } 280