/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /*- * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)kern_acct.c 8.1 (Berkeley) 6/14/93 */ /* HISTORY * 08-May-95 Mac Gillon (mgillon) at NeXT * Purged old history * New version based on 4.4 */ #include <sys/param.h> #include <sys/proc.h> #include <sys/mount.h> #include <sys/vnode.h> #include <sys/file.h> #include <sys/syslog.h> #include <sys/kernel.h> #include <sys/namei.h> #include <sys/errno.h> #include <sys/acct.h> #include <sys/resourcevar.h> #include <sys/ioctl.h> #include <sys/tty.h> /* * The routines implemented in this file are described in: * Leffler, et al.: The Design and Implementation of the 4.3BSD * UNIX Operating System (Addison Welley, 1989) * on pages 62-63. * * Arguably, to simplify accounting operations, this mechanism should * be replaced by one in which an accounting log file (similar to /dev/klog) * is read by a user process, etc. However, that has its own problems. */ /* * Internal accounting functions. * The former's operation is described in Leffler, et al., and the latter * was provided by UCB with the 4.4BSD-Lite release */ comp_t encode_comp_t __P((u_long, u_long)); void acctwatch __P((void *)); void acctwatch_funnel __P((void *)); /* * Accounting vnode pointer, and saved vnode pointer. */ struct vnode *acctp; struct vnode *savacctp; /* * Values associated with enabling and disabling accounting */ int acctsuspend = 2; /* stop accounting when < 2% free space left */ int acctresume = 4; /* resume when free space risen to > 4% */ int acctchkfreq = 15; /* frequency (in seconds) to check space */ /* * Accounting system call. Written based on the specification and * previous implementation done by Mark Tinguely. */ struct acct_args { char *path; }; acct(p, uap, retval) struct proc *p; struct acct_args *uap; int *retval; { struct nameidata nd; int error; /* Make sure that the caller is root. */ if (error = suser(p->p_ucred, &p->p_acflag)) return (error); /* * If accounting is to be started to a file, open that file for * writing and make sure it's a 'normal'. */ if (uap->path != NULL) { NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, uap->path, p); if (error = vn_open(&nd, FWRITE, 0)) return (error); VOP_UNLOCK(nd.ni_vp, 0, p); if (nd.ni_vp->v_type != VREG) { vn_close(nd.ni_vp, FWRITE, p->p_ucred, p); return (EACCES); } } /* * If accounting was previously enabled, kill the old space-watcher, * close the file, and (if no new file was specified, leave). */ if (acctp != NULLVP || savacctp != NULLVP) { untimeout(acctwatch_funnel, NULL); error = vn_close((acctp != NULLVP ? acctp : savacctp), FWRITE, p->p_ucred, p); acctp = savacctp = NULLVP; } if (uap->path == NULL) return (error); /* * Save the new accounting file vnode, and schedule the new * free space watcher. */ acctp = nd.ni_vp; acctwatch(NULL); return (error); } /* * Write out process accounting information, on process exit. * Data to be written out is specified in Leffler, et al. * and are enumerated below. (They're also noted in the system * "acct.h" header file.) */ acct_process(p) struct proc *p; { struct acct acct; struct rusage *r; struct timeval ut, st, tmp; int s, t; struct vnode *vp; /* If accounting isn't enabled, don't bother */ vp = acctp; if (vp == NULLVP) return (0); /* * Get process accounting information. */ /* (1) The name of the command that ran */ bcopy(p->p_comm, acct.ac_comm, sizeof acct.ac_comm); /* (2) The amount of user and system time that was used */ calcru(p, &ut, &st, NULL); acct.ac_utime = encode_comp_t(ut.tv_sec, ut.tv_usec); acct.ac_stime = encode_comp_t(st.tv_sec, st.tv_usec); /* (3) The elapsed time the commmand ran (and its starting time) */ acct.ac_btime = p->p_stats->p_start.tv_sec; s = splclock(); tmp = time; splx(s); timevalsub(&tmp, &p->p_stats->p_start); acct.ac_etime = encode_comp_t(tmp.tv_sec, tmp.tv_usec); /* (4) The average amount of memory used */ r = &p->p_stats->p_ru; tmp = ut; timevaladd(&tmp, &st); t = tmp.tv_sec * hz + tmp.tv_usec / tick; if (t) acct.ac_mem = (r->ru_ixrss + r->ru_idrss + r->ru_isrss) / t; else acct.ac_mem = 0; /* (5) The number of disk I/O operations done */ acct.ac_io = encode_comp_t(r->ru_inblock + r->ru_oublock, 0); /* (6) The UID and GID of the process */ acct.ac_uid = p->p_cred->p_ruid; acct.ac_gid = p->p_cred->p_rgid; /* (7) The terminal from which the process was started */ if ((p->p_flag & P_CONTROLT) && p->p_pgrp->pg_session->s_ttyp) acct.ac_tty = p->p_pgrp->pg_session->s_ttyp->t_dev; else acct.ac_tty = NODEV; /* (8) The boolean flags that tell how the process terminated, etc. */ acct.ac_flag = p->p_acflag; /* * Now, just write the accounting information to the file. */ VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE); return (vn_rdwr(UIO_WRITE, vp, (caddr_t)&acct, sizeof (acct), (off_t)0, UIO_SYSSPACE, IO_APPEND|IO_UNIT, p->p_ucred, (int *)0, p)); } /* * Encode_comp_t converts from ticks in seconds and microseconds * to ticks in 1/AHZ seconds. The encoding is described in * Leffler, et al., on page 63. */ #define MANTSIZE 13 /* 13 bit mantissa. */ #define EXPSIZE 3 /* Base 8 (3 bit) exponent. */ #define MAXFRACT ((1 << MANTSIZE) - 1) /* Maximum fractional value. */ comp_t encode_comp_t(s, us) u_long s, us; { int exp, rnd; exp = 0; rnd = 0; s *= AHZ; s += us / (1000000 / AHZ); /* Maximize precision. */ while (s > MAXFRACT) { rnd = s & (1 << (EXPSIZE - 1)); /* Round up? */ s >>= EXPSIZE; /* Base 8 exponent == 3 bit shift. */ exp++; } /* If we need to round up, do it (and handle overflow correctly). */ if (rnd && (++s > MAXFRACT)) { s >>= EXPSIZE; exp++; } /* Clean it up and polish it off. */ exp <<= MANTSIZE; /* Shift the exponent into place */ exp += s; /* and add on the mantissa. */ return (exp); } void acctwatch_funnel(a) void *a; { thread_funnel_set(kernel_flock, TRUE); acctwatch(a); thread_funnel_set(kernel_flock, FALSE); } /* * Periodically check the file system to see if accounting * should be turned on or off. Beware the case where the vnode * has been vgone()'d out from underneath us, e.g. when the file * system containing the accounting file has been forcibly unmounted. */ /* ARGSUSED */ void acctwatch(a) void *a; { struct statfs sb; if (savacctp != NULLVP) { if (savacctp->v_type == VBAD) { (void) vn_close(savacctp, FWRITE, NOCRED, NULL); savacctp = NULLVP; return; } (void)VFS_STATFS(savacctp->v_mount, &sb, (struct proc *)0); if (sb.f_bavail > acctresume * sb.f_blocks / 100) { acctp = savacctp; savacctp = NULLVP; log(LOG_NOTICE, "Accounting resumed\n"); } } else if (acctp != NULLVP) { if (acctp->v_type == VBAD) { (void) vn_close(acctp, FWRITE, NOCRED, NULL); acctp = NULLVP; return; } (void)VFS_STATFS(acctp->v_mount, &sb, (struct proc *)0); if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) { savacctp = acctp; acctp = NULLVP; log(LOG_NOTICE, "Accounting suspended\n"); } } else { return; } timeout(acctwatch_funnel, NULL, acctchkfreq * hz); }