| 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_acct.c 7.5 (Berkeley) %G% |
| 18 | */ |
| 19 | |
| 20 | #include "param.h" |
| 21 | #include "systm.h" |
| 22 | #include "user.h" |
| 23 | #include "vnode.h" |
| 24 | #include "mount.h" |
| 25 | #include "kernel.h" |
| 26 | #include "acct.h" |
| 27 | #include "uio.h" |
| 28 | #include "syslog.h" |
| 29 | |
| 30 | /* |
| 31 | * Values associated with enabling and disabling accounting |
| 32 | */ |
| 33 | int acctsuspend = 2; /* stop accounting when < 2% free space left */ |
| 34 | int acctresume = 4; /* resume when free space risen to > 4% */ |
| 35 | struct timeval chk = { 15, 0 };/* frequency to check space for accounting */ |
| 36 | |
| 37 | /* |
| 38 | * SHOULD REPLACE THIS WITH A DRIVER THAT CAN BE READ TO SIMPLIFY. |
| 39 | */ |
| 40 | struct vnode *acctp; |
| 41 | struct vnode *savacctp; |
| 42 | |
| 43 | /* |
| 44 | * Perform process accounting functions. |
| 45 | */ |
| 46 | sysacct() |
| 47 | { |
| 48 | register struct vnode *vp; |
| 49 | register struct a { |
| 50 | char *fname; |
| 51 | } *uap = (struct a *)u.u_ap; |
| 52 | register struct nameidata *ndp = &u.u_nd; |
| 53 | extern int acctwatch(); |
| 54 | struct vnode *oacctp; |
| 55 | |
| 56 | if (u.u_error = suser(u.u_cred, &u.u_acflag)) |
| 57 | return; |
| 58 | if (savacctp) { |
| 59 | acctp = savacctp; |
| 60 | savacctp = NULL; |
| 61 | } |
| 62 | if (uap->fname==NULL) { |
| 63 | if (vp = acctp) { |
| 64 | acctp = NULL; |
| 65 | vrele(vp); |
| 66 | untimeout(acctwatch, (caddr_t)&chk); |
| 67 | } |
| 68 | return; |
| 69 | } |
| 70 | ndp->ni_nameiop = LOOKUP | FOLLOW; |
| 71 | ndp->ni_segflg = UIO_USERSPACE; |
| 72 | ndp->ni_dirp = uap->fname; |
| 73 | if (u.u_error = namei(ndp)) |
| 74 | return; |
| 75 | vp = ndp->ni_vp; |
| 76 | if (vp->v_type != VREG) { |
| 77 | u.u_error = EACCES; |
| 78 | vrele(vp); |
| 79 | return; |
| 80 | } |
| 81 | if (vp->v_mount->m_flag & M_RDONLY) { |
| 82 | u.u_error = EROFS; |
| 83 | vrele(vp); |
| 84 | return; |
| 85 | } |
| 86 | oacctp = acctp; |
| 87 | acctp = vp; |
| 88 | if (oacctp) |
| 89 | vrele(oacctp); |
| 90 | acctwatch(&chk); |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Periodically check the file system to see if accounting |
| 95 | * should be turned on or off. |
| 96 | */ |
| 97 | acctwatch(resettime) |
| 98 | struct timeval *resettime; |
| 99 | { |
| 100 | struct statfs sb; |
| 101 | |
| 102 | if (savacctp) { |
| 103 | (void)VFS_STATFS(savacctp->v_mount, &sb); |
| 104 | if (sb.f_bavail > acctresume * sb.f_blocks / 100) { |
| 105 | acctp = savacctp; |
| 106 | savacctp = NULL; |
| 107 | log(LOG_NOTICE, "Accounting resumed\n"); |
| 108 | return; |
| 109 | } |
| 110 | } |
| 111 | if (acctp == NULL) |
| 112 | return; |
| 113 | (void)VFS_STATFS(acctp->v_mount, &sb); |
| 114 | if (sb.f_bavail <= acctsuspend * sb.f_blocks / 100) { |
| 115 | savacctp = acctp; |
| 116 | acctp = NULL; |
| 117 | log(LOG_NOTICE, "Accounting suspended\n"); |
| 118 | } |
| 119 | timeout(acctwatch, (caddr_t)resettime, hzto(resettime)); |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * On exit, write a record on the accounting file. |
| 124 | */ |
| 125 | acct() |
| 126 | { |
| 127 | register struct rusage *ru; |
| 128 | struct vnode *vp; |
| 129 | struct timeval t; |
| 130 | int i; |
| 131 | struct acct acctbuf; |
| 132 | register struct acct *ap = &acctbuf; |
| 133 | |
| 134 | if ((vp = acctp) == NULL) |
| 135 | return; |
| 136 | bcopy(u.u_comm, ap->ac_comm, sizeof(ap->ac_comm)); |
| 137 | ru = &u.u_ru; |
| 138 | ap->ac_utime = compress(ru->ru_utime.tv_sec, ru->ru_utime.tv_usec); |
| 139 | ap->ac_stime = compress(ru->ru_stime.tv_sec, ru->ru_stime.tv_usec); |
| 140 | t = time; |
| 141 | timevalsub(&t, &u.u_start); |
| 142 | ap->ac_etime = compress(t.tv_sec, t.tv_usec); |
| 143 | ap->ac_btime = u.u_start.tv_sec; |
| 144 | ap->ac_uid = u.u_ruid; |
| 145 | ap->ac_gid = u.u_rgid; |
| 146 | t = ru->ru_stime; |
| 147 | timevaladd(&t, &ru->ru_utime); |
| 148 | if (i = t.tv_sec * hz + t.tv_usec / tick) |
| 149 | ap->ac_mem = (ru->ru_ixrss+ru->ru_idrss+ru->ru_isrss) / i; |
| 150 | else |
| 151 | ap->ac_mem = 0; |
| 152 | ap->ac_mem >>= CLSIZELOG2; |
| 153 | ap->ac_io = compress(ru->ru_inblock + ru->ru_oublock, (long)0); |
| 154 | if (u.u_ttyp) |
| 155 | ap->ac_tty = u.u_ttyd; |
| 156 | else |
| 157 | ap->ac_tty = NODEV; |
| 158 | ap->ac_flag = u.u_acflag; |
| 159 | u.u_error = vn_rdwr(UIO_WRITE, vp, (caddr_t)ap, sizeof (acctbuf), |
| 160 | (off_t)0, UIO_SYSSPACE, IO_UNIT|IO_APPEND, u.u_cred, (int *)0); |
| 161 | } |
| 162 | |
| 163 | /* |
| 164 | * Produce a pseudo-floating point representation |
| 165 | * with 3 bits base-8 exponent, 13 bits fraction. |
| 166 | */ |
| 167 | compress(t, ut) |
| 168 | register long t; |
| 169 | long ut; |
| 170 | { |
| 171 | register exp = 0, round = 0; |
| 172 | |
| 173 | t = t * AHZ; /* compiler will convert only this format to a shift */ |
| 174 | if (ut) |
| 175 | t += ut / (1000000 / AHZ); |
| 176 | while (t >= 8192) { |
| 177 | exp++; |
| 178 | round = t&04; |
| 179 | t >>= 3; |
| 180 | } |
| 181 | if (round) { |
| 182 | t++; |
| 183 | if (t >= 8192) { |
| 184 | t >>= 3; |
| 185 | exp++; |
| 186 | } |
| 187 | } |
| 188 | return ((exp<<13) + t); |
| 189 | } |