usr.bin/lastcomm/lastcomm.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)lastcomm.c       8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/lastcomm/lastcomm.c,v 1.10.2.3 2001/10/01 12:51:15 dd Exp $
  36  * $DragonFly: src/usr.bin/lastcomm/lastcomm.c,v 1.3 2003/10/04 20:36:47 hmp Exp $
  37  */
  38
  39 #include <sys/param.h>
  40 #include <sys/stat.h>
  41 #include <sys/acct.h>
  42
  43 #include <ctype.h>
  44 #include <err.h>
  45 #include <fcntl.h>
  46 #include <pwd.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <utmp.h>
  52 #include "pathnames.h"
  53
  54 time_t   expand(u_int);
  55 char    *flagbits(int);
  56 const    char *getdev(dev_t);
  57 int      requested(char *[], struct acct *);
  58 static   void usage(void);
  59
  60 #define AC_UTIME 1 /* user */
  61 #define AC_STIME 2 /* system */
  62 #define AC_ETIME 4 /* elapsed */
  63 #define AC_CTIME 8 /* user + system time, default */
  64
  65 #define AC_BTIME 16 /* starting time */
  66 #define AC_FTIME 32 /* exit time (starting time + elapsed time )*/
  67
  68 #define AC_HZ ((double)AHZ)
  69
  70 int
  71 main(int argc, char **argv)
  72 {
  73         char *p;
  74         struct acct ab;
  75         struct stat sb;
  76         FILE *fp;
  77         off_t size;
  78         time_t t;
  79         int ch;
  80         const char *acctfile;
  81         int flags = 0;
  82
  83         acctfile = _PATH_ACCT;
  84         while ((ch = getopt(argc, argv, "f:usecSE")) != -1)
  85                 switch((char)ch) {
  86                 case 'f':
  87                         acctfile = optarg;
  88                         break;
  89
  90                 case 'u':
  91                         flags |= AC_UTIME; /* user time */
  92                         break;
  93                 case 's':
  94                         flags |= AC_STIME; /* system time */
  95                         break;
  96                 case 'e':
  97                         flags |= AC_ETIME; /* elapsed time */
  98                         break;
  99                 case 'c':
 100                         flags |= AC_CTIME; /* user + system time */
 101                         break;
 102
 103                 case 'S':
 104                         flags |= AC_BTIME; /* starting time */
 105                         break;
 106                 case 'E':
 107                         /* exit time (starting time + elapsed time )*/
 108                         flags |= AC_FTIME;
 109                         break;
 110
 111                 case '?':
 112                 default:
 113                         usage();
 114                 }
 115
 116         /* default user + system time and starting time */
 117         if (!flags) {
 118             flags = AC_CTIME | AC_BTIME;
 119         }
 120
 121         argc -= optind;
 122         argv += optind;
 123
 124         /* Open the file. */
 125         if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
 126                 err(1, "%s", acctfile);
 127
 128         /*
 129          * Round off to integral number of accounting records, probably
 130          * not necessary, but it doesn't hurt.
 131          */
 132         size = sb.st_size - sb.st_size % sizeof(struct acct);
 133
 134         /* Check if any records to display. */
 135         if ((unsigned)size < sizeof(struct acct))
 136                 exit(0);
 137
 138         /*
 139          * Seek to before the last entry in the file; use lseek(2) in case
 140          * the file is bigger than a "long".
 141          */
 142         size -= sizeof(struct acct);
 143         if (lseek(fileno(fp), size, SEEK_SET) == -1)
 144                 err(1, "%s", acctfile);
 145
 146         for (;;) {
 147                 if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
 148                         err(1, "%s", acctfile);
 149
 150                 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
 151                         err(1, "%s", acctfile);
 152
 153                 if (size == 0)
 154                         break;
 155                 size -= sizeof(struct acct);
 156
 157                 if (ab.ac_comm[0] == '\0') {
 158                         ab.ac_comm[0] = '?';
 159                         ab.ac_comm[1] = '\0';
 160                 } else
 161                         for (p = &ab.ac_comm[0];
 162                             p < &ab.ac_comm[AC_COMM_LEN] && *p; ++p)
 163                                 if (!isprint(*p))
 164                                         *p = '?';
 165                 if (*argv && !requested(argv, &ab))
 166                         continue;
 167
 168                 (void)printf("%-*.*s %-7s %-*s %-*s",
 169                              AC_COMM_LEN, AC_COMM_LEN, ab.ac_comm,
 170                              flagbits(ab.ac_flag),
 171                              UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
 172                              UT_LINESIZE, getdev(ab.ac_tty));
 173
 174
 175                 /* user + system time */
 176                 if (flags & AC_CTIME) {
 177                         (void)printf(" %6.2f secs",
 178                                      (expand(ab.ac_utime) +
 179                                       expand(ab.ac_stime))/AC_HZ);
 180                 }
 181
 182                 /* usr time */
 183                 if (flags & AC_UTIME) {
 184                         (void)printf(" %6.2f us", expand(ab.ac_utime)/AC_HZ);
 185                 }
 186
 187                 /* system time */
 188                 if (flags & AC_STIME) {
 189                         (void)printf(" %6.2f sy", expand(ab.ac_stime)/AC_HZ);
 190                 }
 191
 192                 /* elapsed time */
 193                 if (flags & AC_ETIME) {
 194                         (void)printf(" %8.2f es", expand(ab.ac_etime)/AC_HZ);
 195                 }
 196
 197                 /* starting time */
 198                 if (flags & AC_BTIME) {
 199                         (void)printf(" %.16s", ctime(&ab.ac_btime));
 200                 }
 201
 202                 /* exit time (starting time + elapsed time )*/
 203                 if (flags & AC_FTIME) {
 204                         t = ab.ac_btime;
 205                         t += (time_t)(expand(ab.ac_etime)/AC_HZ);
 206                         (void)printf(" %.16s", ctime(&t));
 207                 }
 208                 printf("\n");
 209         }
 210         exit(0);
 211 }
 212
 213 time_t
 214 expand(u_int t)
 215 {
 216         time_t nt;
 217
 218         nt = t & 017777;
 219         t >>= 13;
 220         while (t) {
 221                 t--;
 222                 nt <<= 3;
 223         }
 224         return (nt);
 225 }
 226
 227 char *
 228 flagbits(int f)
 229 {
 230         static char flags[20] = "-";
 231         char *p;
 232
 233 #define BIT(flag, ch)   if (f & flag) *p++ = ch
 234
 235         p = flags + 1;
 236         BIT(ASU, 'S');
 237         BIT(AFORK, 'F');
 238         BIT(ACOMPAT, 'C');
 239         BIT(ACORE, 'D');
 240         BIT(AXSIG, 'X');
 241         *p = '\0';
 242         return (flags);
 243 }
 244
 245 int
 246 requested(char **argv, struct acct *acp)
 247 {
 248         const char *p;
 249
 250         do {
 251                 p = user_from_uid(acp->ac_uid, 0);
 252                 if (!strcmp(p, *argv))
 253                         return (1);
 254                 if ((p = getdev(acp->ac_tty)) && !strcmp(p, *argv))
 255                         return (1);
 256                 if (!strncmp(acp->ac_comm, *argv, AC_COMM_LEN))
 257                         return (1);
 258         } while (*++argv);
 259         return (0);
 260 }
 261
 262 const char *
 263 getdev(dev_t dev)
 264 {
 265         static dev_t lastdev = (dev_t)-1;
 266         static const char *lastname;
 267
 268         if (dev == NODEV)                       /* Special case. */
 269                 return ("__");
 270         if (dev == lastdev)                     /* One-element cache. */
 271                 return (lastname);
 272         lastdev = dev;
 273         lastname = devname(dev, S_IFCHR);
 274         return (lastname);
 275 }
 276
 277 static void
 278 usage(void)
 279 {
 280         (void)fprintf(stderr,
 281 "usage: lastcomm [-EScesu] [ -f file ] [command ...] [user ...] [tty ...]\n");
 282         exit(1);
 283 }