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 1.20.2.1 2007/04/18 05:53:50 dds 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 = 0;
  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         if (strcmp(acctfile, "-") == 0)
 125                 fp = stdin;
 126         else {
 127                 /* Open the file. */
 128                 if ((fp = fopen(acctfile, "r")) == NULL ||
 129                     fstat(fileno(fp), &sb))
 130                         err(1, "could not open %s", acctfile);
 131
 132                 /*
 133                  * Round off to integral number of accounting records,
 134                  * probably not necessary, but it doesn't hurt.
 135                  */
 136                 size = sb.st_size - sb.st_size % sizeof(struct acct);
 137
 138                 /* Check if any records to display. */
 139                 if ((unsigned)size < sizeof(struct acct))
 140                         exit(0);
 141         }
 142
 143         do {
 144                 int rv;
 145
 146                 if (fp != stdin) {
 147                         size -= sizeof(struct acct);
 148                         if (fseeko(fp, size, SEEK_SET) == -1)
 149                                 err(1, "seek %s failed", acctfile);
 150                 }
 151
 152                 if ((rv = fread(&ab, sizeof(struct acct), 1, fp)) != 1) {
 153                         if (feof(fp))
 154                                 break;
 155                         else
 156                                 err(1, "read %s returned %d", acctfile, rv);
 157                 }
 158
 159                 if (ab.ac_comm[0] == '\0') {
 160                         ab.ac_comm[0] = '?';
 161                         ab.ac_comm[1] = '\0';
 162                 } else
 163                         for (p = &ab.ac_comm[0];
 164                             p < &ab.ac_comm[AC_COMM_LEN] && *p; ++p)
 165                                 if (!isprint(*p))
 166                                         *p = '?';
 167                 if (*argv && !requested(argv, &ab))
 168                         continue;
 169
 170                 (void)printf("%-*.*s %-7s %-*s %-*s",
 171                              AC_COMM_LEN, AC_COMM_LEN, ab.ac_comm,
 172                              flagbits(ab.ac_flag),
 173                              UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
 174                              UT_LINESIZE, getdev(ab.ac_tty));
 175
 176
 177                 /* user + system time */
 178                 if (flags & AC_CTIME) {
 179                         (void)printf(" %6.2f secs",
 180                                      (expand(ab.ac_utime) +
 181                                       expand(ab.ac_stime))/AC_HZ);
 182                 }
 183
 184                 /* usr time */
 185                 if (flags & AC_UTIME) {
 186                         (void)printf(" %6.2f us", expand(ab.ac_utime)/AC_HZ);
 187                 }
 188
 189                 /* system time */
 190                 if (flags & AC_STIME) {
 191                         (void)printf(" %6.2f sy", expand(ab.ac_stime)/AC_HZ);
 192                 }
 193
 194                 /* elapsed time */
 195                 if (flags & AC_ETIME) {
 196                         (void)printf(" %8.2f es", expand(ab.ac_etime)/AC_HZ);
 197                 }
 198
 199                 /* starting time */
 200                 if (flags & AC_BTIME) {
 201                         (void)printf(" %.16s", ctime(&ab.ac_btime));
 202                 }
 203
 204                 /* exit time (starting time + elapsed time )*/
 205                 if (flags & AC_FTIME) {
 206                         t = ab.ac_btime;
 207                         t += (time_t)(expand(ab.ac_etime)/AC_HZ);
 208                         (void)printf(" %.16s", ctime(&t));
 209                 }
 210                 printf("\n");
 211
 212         } while (size > 0);
 213         exit(0);
 214 }
 215
 216 time_t
 217 expand(u_int t)
 218 {
 219         time_t nt;
 220
 221         nt = t & 017777;
 222         t >>= 13;
 223         while (t) {
 224                 t--;
 225                 nt <<= 3;
 226         }
 227         return (nt);
 228 }
 229
 230 char *
 231 flagbits(int f)
 232 {
 233         static char flags[20] = "-";
 234         char *p;
 235
 236 #define BIT(flag, ch)   if (f & flag) *p++ = ch
 237
 238         p = flags + 1;
 239         BIT(ASU, 'S');
 240         BIT(AFORK, 'F');
 241         BIT(ACOMPAT, 'C');
 242         BIT(ACORE, 'D');
 243         BIT(AXSIG, 'X');
 244         *p = '\0';
 245         return (flags);
 246 }
 247
 248 int
 249 requested(char *argv[], struct acct *acp)
 250 {
 251         const char *p;
 252
 253         do {
 254                 p = user_from_uid(acp->ac_uid, 0);
 255                 if (!strcmp(p, *argv))
 256                         return (1);
 257                 if ((p = getdev(acp->ac_tty)) && !strcmp(p, *argv))
 258                         return (1);
 259                 if (!strncmp(acp->ac_comm, *argv, AC_COMM_LEN))
 260                         return (1);
 261         } while (*++argv);
 262         return (0);
 263 }
 264
 265 const char *
 266 getdev(dev_t dev)
 267 {
 268         static dev_t lastdev = (dev_t)-1;
 269         static const char *lastname;
 270
 271         if (dev == NODEV)                       /* Special case. */
 272                 return ("__");
 273         if (dev == lastdev)                     /* One-element cache. */
 274                 return (lastname);
 275         lastdev = dev;
 276         lastname = devname(dev, S_IFCHR);
 277         return (lastname);
 278 }
 279
 280 static void
 281 usage(void)
 282 {
 283         (void)fprintf(stderr,
 284 "usage: lastcomm [-EScesu] [-f file] [command ...] [user ...] [terminal ...]\n");
 285         exit(1);
 286 }