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 <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <unistd.h>
  50 #include <utmp.h>
  51 #include "pathnames.h"
  52
  53 time_t   expand(u_int);
  54 char    *flagbits(int);
  55 const    char *getdev(dev_t);
  56 int      requested(char *[], struct acct *);
  57 static   void usage(void);
  58
  59 #define AC_UTIME 1 /* user */
  60 #define AC_STIME 2 /* system */
  61 #define AC_ETIME 4 /* elapsed */
  62 #define AC_CTIME 8 /* user + system time, default */
  63
  64 #define AC_BTIME 16 /* starting time */
  65 #define AC_FTIME 32 /* exit time (starting time + elapsed time )*/
  66
  67 #define AC_HZ ((double)AHZ)
  68
  69 int
  70 main(int argc, char **argv)
  71 {
  72         char *p;
  73         struct acct ab;
  74         struct stat sb;
  75         FILE *fp;
  76         off_t size;
  77         time_t t;
  78         int ch;
  79         const char *acctfile;
  80         int flags = 0;
  81
  82         acctfile = _PATH_ACCT;
  83         while ((ch = getopt(argc, argv, "f:usecSE")) != -1)
  84                 switch((char)ch) {
  85                 case 'f':
  86                         acctfile = optarg;
  87                         break;
  88
  89                 case 'u':
  90                         flags |= AC_UTIME; /* user time */
  91                         break;
  92                 case 's':
  93                         flags |= AC_STIME; /* system time */
  94                         break;
  95                 case 'e':
  96                         flags |= AC_ETIME; /* elapsed time */
  97                         break;
  98                 case 'c':
  99                         flags |= AC_CTIME; /* user + system time */
 100                         break;
 101
 102                 case 'S':
 103                         flags |= AC_BTIME; /* starting time */
 104                         break;
 105                 case 'E':
 106                         /* exit time (starting time + elapsed time )*/
 107                         flags |= AC_FTIME;
 108                         break;
 109
 110                 case '?':
 111                 default:
 112                         usage();
 113                 }
 114
 115         /* default user + system time and starting time */
 116         if (!flags) {
 117             flags = AC_CTIME | AC_BTIME;
 118         }
 119
 120         argc -= optind;
 121         argv += optind;
 122
 123         /* Open the file. */
 124         if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
 125                 err(1, "%s", acctfile);
 126
 127         /*
 128          * Round off to integral number of accounting records, probably
 129          * not necessary, but it doesn't hurt.
 130          */
 131         size = sb.st_size - sb.st_size % sizeof(struct acct);
 132
 133         /* Check if any records to display. */
 134         if ((unsigned)size < sizeof(struct acct))
 135                 exit(0);
 136
 137         /*
 138          * Seek to before the last entry in the file; use lseek(2) in case
 139          * the file is bigger than a "long".
 140          */
 141         size -= sizeof(struct acct);
 142         if (lseek(fileno(fp), size, SEEK_SET) == -1)
 143                 err(1, "%s", acctfile);
 144
 145         for (;;) {
 146                 if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
 147                         err(1, "%s", acctfile);
 148
 149                 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
 150                         err(1, "%s", acctfile);
 151
 152                 if (size == 0)
 153                         break;
 154                 size -= sizeof(struct acct);
 155
 156                 if (ab.ac_comm[0] == '\0') {
 157                         ab.ac_comm[0] = '?';
 158                         ab.ac_comm[1] = '\0';
 159                 } else
 160                         for (p = &ab.ac_comm[0];
 161                             p < &ab.ac_comm[AC_COMM_LEN] && *p; ++p)
 162                                 if (!isprint(*p))
 163                                         *p = '?';
 164                 if (*argv && !requested(argv, &ab))
 165                         continue;
 166
 167                 (void)printf("%-*.*s %-7s %-*s %-*s",
 168                              AC_COMM_LEN, AC_COMM_LEN, ab.ac_comm,
 169                              flagbits(ab.ac_flag),
 170                              UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
 171                              UT_LINESIZE, getdev(ab.ac_tty));
 172
 173
 174                 /* user + system time */
 175                 if (flags & AC_CTIME) {
 176                         (void)printf(" %6.2f secs",
 177                                      (expand(ab.ac_utime) +
 178                                       expand(ab.ac_stime))/AC_HZ);
 179                 }
 180
 181                 /* usr time */
 182                 if (flags & AC_UTIME) {
 183                         (void)printf(" %6.2f us", expand(ab.ac_utime)/AC_HZ);
 184                 }
 185
 186                 /* system time */
 187                 if (flags & AC_STIME) {
 188                         (void)printf(" %6.2f sy", expand(ab.ac_stime)/AC_HZ);
 189                 }
 190
 191                 /* elapsed time */
 192                 if (flags & AC_ETIME) {
 193                         (void)printf(" %8.2f es", expand(ab.ac_etime)/AC_HZ);
 194                 }
 195
 196                 /* starting time */
 197                 if (flags & AC_BTIME) {
 198                         (void)printf(" %.16s", ctime(&ab.ac_btime));
 199                 }
 200
 201                 /* exit time (starting time + elapsed time )*/
 202                 if (flags & AC_FTIME) {
 203                         t = ab.ac_btime;
 204                         t += (time_t)(expand(ab.ac_etime)/AC_HZ);
 205                         (void)printf(" %.16s", ctime(&t));
 206                 }
 207                 printf("\n");
 208         }
 209         exit(0);
 210 }
 211
 212 time_t
 213 expand(u_int t)
 214 {
 215         time_t nt;
 216
 217         nt = t & 017777;
 218         t >>= 13;
 219         while (t) {
 220                 t--;
 221                 nt <<= 3;
 222         }
 223         return (nt);
 224 }
 225
 226 char *
 227 flagbits(int f)
 228 {
 229         static char flags[20] = "-";
 230         char *p;
 231
 232 #define BIT(flag, ch)   if (f & flag) *p++ = ch
 233
 234         p = flags + 1;
 235         BIT(ASU, 'S');
 236         BIT(AFORK, 'F');
 237         BIT(ACOMPAT, 'C');
 238         BIT(ACORE, 'D');
 239         BIT(AXSIG, 'X');
 240         *p = '\0';
 241         return (flags);
 242 }
 243
 244 int
 245 requested(char **argv, struct acct *acp)
 246 {
 247         const char *p;
 248
 249         do {
 250                 p = user_from_uid(acp->ac_uid, 0);
 251                 if (!strcmp(p, *argv))
 252                         return (1);
 253                 if ((p = getdev(acp->ac_tty)) && !strcmp(p, *argv))
 254                         return (1);
 255                 if (!strncmp(acp->ac_comm, *argv, AC_COMM_LEN))
 256                         return (1);
 257         } while (*++argv);
 258         return (0);
 259 }
 260
 261 const char *
 262 getdev(dev_t dev)
 263 {
 264         static dev_t lastdev = (dev_t)-1;
 265         static const char *lastname;
 266
 267         if (dev == NODEV)                       /* Special case. */
 268                 return ("__");
 269         if (dev == lastdev)                     /* One-element cache. */
 270                 return (lastname);
 271         lastdev = dev;
 272         lastname = devname(dev, S_IFCHR);
 273         return (lastname);
 274 }
 275
 276 static void
 277 usage(void)
 278 {
 279         (void)fprintf(stderr,
 280 "usage: lastcomm [-EScesu] [ -f file ] [command ...] [user ...] [tty ...]\n");
 281         exit(1);
 282 }