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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*-
27: * Copyright (c) 1982, 1986, 1989, 1993
28: * The Regents of the University of California. All rights reserved.
29: * (c) UNIX System Laboratories, Inc.
30: * All or some portions of this file are derived from material licensed
31: * to the University of California by American Telephone and Telegraph
32: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
33: * the permission of UNIX System Laboratories, Inc.
34: *
35: * Redistribution and use in source and binary forms, with or without
36: * modification, are permitted provided that the following conditions
37: * are met:
38: * 1. Redistributions of source code must retain the above copyright
39: * notice, this list of conditions and the following disclaimer.
40: * 2. Redistributions in binary form must reproduce the above copyright
41: * notice, this list of conditions and the following disclaimer in the
42: * documentation and/or other materials provided with the distribution.
43: * 3. All advertising materials mentioning features or use of this software
44: * must display the following acknowledgement:
45: * This product includes software developed by the University of
46: * California, Berkeley and its contributors.
47: * 4. Neither the name of the University nor the names of its contributors
48: * may be used to endorse or promote products derived from this software
49: * without specific prior written permission.
50: *
51: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61: * SUCH DAMAGE.
62: *
63: * @(#)kern_acct.c 8.1 (Berkeley) 6/14/93
64: */
65: /* HISTORY
66: * 08-May-95 Mac Gillon (mgillon) at NeXT
67: * Purged old history
68: * New version based on 4.4
69: */
70:
71:
72: #include <sys/param.h>
73: #include <sys/proc.h>
74: #include <sys/mount.h>
75: #include <sys/vnode.h>
76: #include <sys/file.h>
77: #include <sys/syslog.h>
78: #include <sys/kernel.h>
79: #include <sys/namei.h>
80: #include <sys/errno.h>
81: #include <sys/acct.h>
82: #include <sys/resourcevar.h>
83: #include <sys/ioctl.h>
84: #include <sys/tty.h>
85:
86: /*
87: * The routines implemented in this file are described in:
88: * Leffler, et al.: The Design and Implementation of the 4.3BSD
89: * UNIX Operating System (Addison Welley, 1989)
90: * on pages 62-63.
91: *
92: * Arguably, to simplify accounting operations, this mechanism should
93: * be replaced by one in which an accounting log file (similar to /dev/klog)
94: * is read by a user process, etc. However, that has its own problems.
95: */
96:
97: /*
98: * Internal accounting functions.
99: * The former's operation is described in Leffler, et al., and the latter
100: * was provided by UCB with the 4.4BSD-Lite release
101: */
102: comp_t encode_comp_t __P((u_long, u_long));
103: void acctwatch __P((void *));
104:
105: /*
106: * Accounting vnode pointer, and saved vnode pointer.
107: */
108: struct vnode *acctp;
109: struct vnode *savacctp;
110:
111: /*
112: * Values associated with enabling and disabling accounting
113: */
114: int acctsuspend = 2; /* stop accounting when < 2% free space left */
115: int acctresume = 4; /* resume when free space risen to > 4% */
116: int acctchkfreq = 15; /* frequency (in seconds) to check space */
117:
118: /*
119: * Accounting system call. Written based on the specification and
120: * previous implementation done by Mark Tinguely.
121: */
122: struct acct_args {
123: char *path;
124: };
125: acct(p, uap, retval)
126: struct proc *p;
127: struct acct_args *uap;
128: int *retval;
129: {
130: struct nameidata nd;
131: int error;
132:
133: /* Make sure that the caller is root. */
134: if (error = suser(p->p_ucred, &p->p_acflag))
135: return (error);
136:
137: /*
138: * If accounting is to be started to a file, open that file for
139: * writing and make sure it's a 'normal'.
140: */
141: if (uap->path != NULL) {
142: NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, p);
143: if (error = vn_open(&nd, FWRITE, 0))
144: return (error);
145: VOP_UNLOCK(nd.ni_vp, 0, p);
146: if (nd.ni_vp->v_type != VREG) {
147: vn_close(nd.ni_vp, FWRITE, p->p_ucred, p);
148: return (EACCES);
149: }
150: }
151:
152: /*
153: * If accounting was previously enabled, kill the old space-watcher,
154: * close the file, and (if no new file was specified, leave).
155: */
156: if (acctp != NULLVP || savacctp != NULLVP) {
157: untimeout(acctwatch, NULL);
158: error = vn_close((acctp != NULLVP ? acctp : savacctp), FWRITE,
159: p->p_ucred, p);
160: acctp = savacctp = NULLVP;
161: }
162: if (uap->path == NULL)
163: return (error);
164:
165: /*
166: * Save the new accounting file vnode, and schedule the new
167: * free space watcher.
168: */
169: acctp = nd.ni_vp;
170: acctwatch(NULL);
171: return (error);
172: }
173:
174: /*
175: * Write out process accounting information, on process exit.
176: * Data to be written out is specified in Leffler, et al.
177: * and are enumerated below. (They're also noted in the system
178: * "acct.h" header file.)
179: */
180: acct_process(p)
181: struct proc *p;
182: {
183: struct acct acct;
184: struct rusage *r;
185: struct timeval ut, st, tmp;
186: int s, t;
187: struct vnode *vp;
188:
189: /* If accounting isn't enabled, don't bother */
190: vp = acctp;
191: if (vp == NULLVP)
192: return (0);
193:
194: /*
195: * Get process accounting information.
196: */
197:
198: /* (1) The name of the command that ran */
199: bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm);
200:
201: /* (2) The amount of user and system time that was used */
202: calcru(p, &ut, &st, NULL);
203: acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec);
204: acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec);
205:
206: /* (3) The elapsed time the commmand ran (and its starting time) */
207: acct.ac_btime = p->p_stats->p_start.tv_sec;
208: s = splclock();
209: tmp = time;
210: splx(s);
211: timevalsub(&tmp, &p->p_stats->p_start);
212: acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec);
213:
214: /* (4) The average amount of memory used */
215: r = &p->p_stats->p_ru;
216: tmp = ut;
217: timevaladd(&tmp, &st);
218: t = tmp.tv_sec * hz + tmp.tv_usec / tick;
219: if (t)
220: acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t;
221: else
222: acct.ac_mem = 0;
223:
224: /* (5) The number of disk I/O operations done */
225: acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0);
226:
227: /* (6) The UID and GID of the process */
228: acct.ac_uid = p->p_cred->p_ruid;
229: acct.ac_gid = p->p_cred->p_rgid;
230:
231: /* (7) The terminal from which the process was started */
232: if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp)
233: acct.ac_tty = p->p_pgrp->pg_session->s_ttyp->t_dev;
234: else
235: acct.ac_tty = NODEV;
236:
237: /* (8) The boolean flags that tell how the process terminated, etc. */
238: acct.ac_flag = p->p_acflag;
239:
240: /*
241: * Now, just write the accounting information to the file.
242: */
243: VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
244: return (vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct),
245: (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, p->p_ucred,
246: (int *)0, p));
247: }
248:
249: /*
250: * Encode_comp_t converts from ticks in seconds and microseconds
251: * to ticks in 1/AHZ seconds. The encoding is described in
252: * Leffler, et al., on page 63.
253: */
254:
255: #define MANTSIZE 13 /* 13 bit mantissa. */
256: #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */
257: #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */
258:
259: comp_t
260: encode_comp_t(s, us)
261: u_long s, us;
262: {
263: int exp, rnd;
264:
265: exp = 0;
266: rnd = 0;
267: s *= AHZ;
268: s += us / (1000000 / AHZ); /* Maximize precision. */
269:
270: while (s > MAXFRACT) {
271: rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */
272: s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */
273: exp++;
274: }
275:
276: /* If we need to round up, do it (and handle overflow correctly). */
277: if (rnd && (++s > MAXFRACT)) {
278: s >>= EXPSIZE;
279: exp++;
280: }
281:
282: /* Clean it up and polish it off. */
283: exp <<= MANTSIZE; /* Shift the exponent into place */
284: exp += s; /* and add on the mantissa. */
285: return (exp);
286: }
287:
288: /*
289: * Periodically check the file system to see if accounting
290: * should be turned on or off. Beware the case where the vnode
291: * has been vgone()'d out from underneath us, e.g. when the file
292: * system containing the accounting file has been forcibly unmounted.
293: */
294: /* ARGSUSED */
295: void
296: acctwatch(a)
297: void *a;
298: {
299: struct statfs sb;
300:
301: if (savacctp != NULLVP) {
302: if (savacctp->v_type == VBAD) {
303: (void) vn_close(savacctp, FWRITE, NOCRED, NULL);
304: savacctp = NULLVP;
305: return;
306: }
307: (void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0);
308: if (sb.f_bavail > acctresume * sb.f_blocks / 100) {
309: acctp = savacctp;
310: savacctp = NULLVP;
311: log(LOG_NOTICE, "Accounting resumed\n");
312: }
313: } else if (acctp != NULLVP) {
314: if (acctp->v_type == VBAD) {
315: (void) vn_close(acctp, FWRITE, NOCRED, NULL);
316: acctp = NULLVP;
317: return;
318: }
319: (void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0);
320: if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) {
321: savacctp = acctp;
322: acctp = NULLVP;
323: log(LOG_NOTICE, "Accounting suspended\n");
324: }
325: } else
326: return;
327: timeout(acctwatch, NULL, acctchkfreq * hz);
328: }
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