lastcomm/lastcomm.c

   1 /*      $NetBSD: lastcomm.c,v 1.14 1998/04/02 10:22:03 kleink Exp $     */
   2
   3 /*
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
  39         The Regents of the University of California.  All rights reserved.\n");
  40 #endif /* not lint */
  41
  42 #ifndef lint
  43 #if 0
  44 static char sccsid[] = "@(#)lastcomm.c  8.2 (Berkeley) 4/29/95";
  45 #endif
  46 __RCSID("$NetBSD: lastcomm.c,v 1.14 1998/04/02 10:22:03 kleink Exp $");
  47 #endif /* not lint */
  48
  49 #include <sys/param.h>
  50 #include <sys/stat.h>
  51 #include <sys/acct.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <fcntl.h>
  56 #include <math.h>
  57 #include <pwd.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <struct.h>
  62 #include <time.h>
  63 #include <tzfile.h>
  64 #include <unistd.h>
  65 #include <utmp.h>
  66 #include "pathnames.h"
  67
  68 time_t   expand __P((u_int));
  69 char    *flagbits __P((int));
  70 char    *getdev __P((dev_t));
  71 int      main __P((int, char **));
  72 int      requested __P((char *[], struct acct *));
  73 void     usage __P((void));
  74
  75 int
  76 main(argc, argv)
  77         int argc;
  78         char *argv[];
  79 {
  80         char *p;
  81         struct acct ab;
  82         struct stat sb;
  83         FILE *fp;
  84         off_t size;
  85         time_t t;
  86         double delta;
  87         int ch;
  88         char *acctfile;
  89
  90         acctfile = _PATH_ACCT;
  91         while ((ch = getopt(argc, argv, "f:")) != -1)
  92                 switch((char)ch) {
  93                 case 'f':
  94                         acctfile = optarg;
  95                         break;
  96                 case '?':
  97                 default:
  98                         usage();
  99                 }
 100         argc -= optind;
 101         argv += optind;
 102
 103         /* Open the file. */
 104         if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
 105                 err(1, "%s", acctfile);
 106
 107         /*
 108          * Round off to integral number of accounting records, probably
 109          * not necessary, but it doesn't hurt.
 110          */
 111         size = sb.st_size - sb.st_size % sizeof(struct acct);
 112
 113         /* Check if any records to display. */
 114         if (size < sizeof(struct acct))
 115                 exit(0);
 116
 117         /*
 118          * Seek to before the last entry in the file; use lseek(2) in case
 119          * the file is bigger than a "long".
 120          */
 121         size -= sizeof(struct acct);
 122         if (lseek(fileno(fp), size, SEEK_SET) == -1)
 123                 err(1, "%s", acctfile);
 124
 125         for (;;) {
 126                 if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
 127                         err(1, "%s", acctfile);
 128
 129                 if (ab.ac_comm[0] == '\0') {
 130                         ab.ac_comm[0] = '?';
 131                         ab.ac_comm[1] = '\0';
 132                 } else
 133                         for (p = &ab.ac_comm[0];
 134                             p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
 135                                 if (!isprint(*p))
 136                                         *p = '?';
 137                 if (!*argv || requested(argv, &ab)) {
 138
 139                         t = expand(ab.ac_utime) + expand(ab.ac_stime);
 140                         (void)printf(
 141                             "%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
 142                              (int)fldsiz(acct, ac_comm),
 143                              (int)fldsiz(acct, ac_comm),
 144                              ab.ac_comm, flagbits(ab.ac_flag),
 145                              UT_NAMESIZE, UT_NAMESIZE,
 146                              user_from_uid(ab.ac_uid, 0), UT_LINESIZE,
 147                              UT_LINESIZE, getdev(ab.ac_tty),
 148                              t / (double)AHZ, ctime(&ab.ac_btime));
 149                         delta = expand(ab.ac_etime) / (double)AHZ;
 150                         printf(" (%1.0f:%02.0f:%05.2f)\n",
 151                                delta / SECSPERHOUR,
 152                                fmod(delta, SECSPERHOUR) / SECSPERMIN,
 153                                fmod(delta, SECSPERMIN));
 154                 }
 155                 /* are we at the beginning of the file yet? */
 156                 if (size == 0)
 157                         break;
 158                 /* seek backward over the one we read and the next to read */
 159                 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
 160                         err(1, "%s", acctfile);
 161                 /* and account for its size */
 162                 size -= sizeof(struct acct);
 163         }
 164         exit(0);
 165 }
 166
 167 time_t
 168 expand(t)
 169         u_int t;
 170 {
 171         time_t nt;
 172
 173         nt = t & 017777;
 174         t >>= 13;
 175         while (t) {
 176                 t--;
 177                 nt <<= 3;
 178         }
 179         return (nt);
 180 }
 181
 182 char *
 183 flagbits(f)
 184         int f;
 185 {
 186         static char flags[20] = "-";
 187         char *p;
 188
 189 #define BIT(flag, ch)   if (f & flag) *p++ = ch
 190
 191         p = flags + 1;
 192         BIT(ASU, 'S');
 193         BIT(AFORK, 'F');
 194         BIT(ACOMPAT, 'C');
 195         BIT(ACORE, 'D');
 196         BIT(AXSIG, 'X');
 197         *p = '\0';
 198         return (flags);
 199 }
 200
 201 int
 202 requested(argv, acp)
 203         char *argv[];
 204         struct acct *acp;
 205 {
 206         do {
 207                 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
 208                         return (1);
 209                 if (!strcmp(getdev(acp->ac_tty), *argv))
 210                         return (1);
 211                 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
 212                         return (1);
 213         } while (*++argv);
 214         return (0);
 215 }
 216
 217 char *
 218 getdev(dev)
 219         dev_t dev;
 220 {
 221         static dev_t lastdev = (dev_t)-1;
 222         static char *lastname;
 223
 224         if (dev == NODEV)                       /* Special case. */
 225                 return ("__");
 226         if (dev == lastdev)                     /* One-element cache. */
 227                 return (lastname);
 228         lastdev = dev;
 229         if ((lastname = devname(dev, S_IFCHR)) == NULL)
 230                 lastname = "??";
 231         return (lastname);
 232 }
 233
 234 void
 235 usage()
 236 {
 237         (void)fprintf(stderr,
 238             "lastcomm [ -f file ] [command ...] [user ...] [tty ...]\n");
 239         exit(1);
 240 }