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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)lastcomm.c       8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/lastcomm/lastcomm.c,v 1.20.2.1 2007/04/18 05:53:50 dds Exp $
  32  */
  33
  34 #include <sys/param.h>
  35 #include <sys/stat.h>
  36 #include <sys/acct.h>
  37
  38 #include <ctype.h>
  39 #include <err.h>
  40 #include <fcntl.h>
  41 #include <pwd.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include "pathnames.h"
  47
  48 time_t   expand(u_int);
  49 char    *flagbits(int);
  50 const    char *getdev(dev_t);
  51 int      requested(char *[], struct acct *);
  52 static   void usage(void);
  53
  54 #define AC_UTIME 1 /* user */
  55 #define AC_STIME 2 /* system */
  56 #define AC_ETIME 4 /* elapsed */
  57 #define AC_CTIME 8 /* user + system time, default */
  58
  59 #define AC_BTIME 16 /* starting time */
  60 #define AC_FTIME 32 /* exit time (starting time + elapsed time )*/
  61
  62 #define AC_HZ ((double)AHZ)
  63
  64 int
  65 main(int argc, char *argv[])
  66 {
  67         char *p;
  68         struct acct ab;
  69         struct stat sb;
  70         FILE *fp;
  71         off_t size = 0;
  72         time_t t;
  73         int ch;
  74         const char *acctfile;
  75         int flags = 0;
  76
  77         acctfile = _PATH_ACCT;
  78         while ((ch = getopt(argc, argv, "f:usecSE")) != -1)
  79                 switch((char)ch) {
  80                 case 'f':
  81                         acctfile = optarg;
  82                         break;
  83
  84                 case 'u':
  85                         flags |= AC_UTIME; /* user time */
  86                         break;
  87                 case 's':
  88                         flags |= AC_STIME; /* system time */
  89                         break;
  90                 case 'e':
  91                         flags |= AC_ETIME; /* elapsed time */
  92                         break;
  93                 case 'c':
  94                         flags |= AC_CTIME; /* user + system time */
  95                         break;
  96
  97                 case 'S':
  98                         flags |= AC_BTIME; /* starting time */
  99                         break;
 100                 case 'E':
 101                         /* exit time (starting time + elapsed time )*/
 102                         flags |= AC_FTIME;
 103                         break;
 104
 105                 case '?':
 106                 default:
 107                         usage();
 108                 }
 109
 110         /* default user + system time and starting time */
 111         if (!flags) {
 112             flags = AC_CTIME | AC_BTIME;
 113         }
 114
 115         argc -= optind;
 116         argv += optind;
 117
 118         if (strcmp(acctfile, "-") == 0)
 119                 fp = stdin;
 120         else {
 121                 /* Open the file. */
 122                 if ((fp = fopen(acctfile, "r")) == NULL ||
 123                     fstat(fileno(fp), &sb))
 124                         err(1, "could not open %s", acctfile);
 125
 126                 /*
 127                  * Round off to integral number of accounting records,
 128                  * probably not necessary, but it doesn't hurt.
 129                  */
 130                 size = sb.st_size - sb.st_size % sizeof(struct acct);
 131
 132                 /* Check if any records to display. */
 133                 if ((unsigned)size < sizeof(struct acct))
 134                         exit(0);
 135         }
 136
 137         do {
 138                 int rv;
 139
 140                 if (fp != stdin) {
 141                         size -= sizeof(struct acct);
 142                         if (fseeko(fp, size, SEEK_SET) == -1)
 143                                 err(1, "seek %s failed", acctfile);
 144                 }
 145
 146                 if ((rv = fread(&ab, sizeof(struct acct), 1, fp)) != 1) {
 147                         if (feof(fp))
 148                                 break;
 149                         else
 150                                 err(1, "read %s returned %d", acctfile, rv);
 151                 }
 152
 153                 if (ab.ac_comm[0] == '\0') {
 154                         ab.ac_comm[0] = '?';
 155                         ab.ac_comm[1] = '\0';
 156                 } else
 157                         for (p = &ab.ac_comm[0];
 158                             p < &ab.ac_comm[AC_COMM_LEN] && *p; ++p)
 159                                 if (!isprint(*p))
 160                                         *p = '?';
 161                 if (*argv && !requested(argv, &ab))
 162                         continue;
 163
 164                 (void)printf("%-*.*s %-7s %-*s %-8s",
 165                              AC_COMM_LEN, AC_COMM_LEN, ab.ac_comm,
 166                              flagbits(ab.ac_flag),
 167                              MAXLOGNAME - 1, user_from_uid(ab.ac_uid, 0),
 168                              getdev(ab.ac_tty));
 169
 170
 171                 /* user + system time */
 172                 if (flags & AC_CTIME) {
 173                         (void)printf(" %6.2f secs",
 174                                      (expand(ab.ac_utime) +
 175                                       expand(ab.ac_stime))/AC_HZ);
 176                 }
 177
 178                 /* usr time */
 179                 if (flags & AC_UTIME) {
 180                         (void)printf(" %6.2f us", expand(ab.ac_utime)/AC_HZ);
 181                 }
 182
 183                 /* system time */
 184                 if (flags & AC_STIME) {
 185                         (void)printf(" %6.2f sy", expand(ab.ac_stime)/AC_HZ);
 186                 }
 187
 188                 /* elapsed time */
 189                 if (flags & AC_ETIME) {
 190                         (void)printf(" %8.2f es", expand(ab.ac_etime)/AC_HZ);
 191                 }
 192
 193                 /* starting time */
 194                 if (flags & AC_BTIME) {
 195                         (void)printf(" %.16s", ctime(&ab.ac_btime));
 196                 }
 197
 198                 /* exit time (starting time + elapsed time )*/
 199                 if (flags & AC_FTIME) {
 200                         t = ab.ac_btime;
 201                         t += (time_t)(expand(ab.ac_etime)/AC_HZ);
 202                         (void)printf(" %.16s", ctime(&t));
 203                 }
 204                 printf("\n");
 205
 206         } while (size > 0);
 207         exit(0);
 208 }
 209
 210 time_t
 211 expand(u_int t)
 212 {
 213         time_t nt;
 214
 215         nt = t & 017777;
 216         t >>= 13;
 217         while (t) {
 218                 t--;
 219                 nt <<= 3;
 220         }
 221         return (nt);
 222 }
 223
 224 char *
 225 flagbits(int f)
 226 {
 227         static char flags[20] = "-";
 228         char *p;
 229
 230 #define BIT(flag, ch)   if (f & flag) *p++ = ch
 231
 232         p = flags + 1;
 233         BIT(ASU, 'S');
 234         BIT(AFORK, 'F');
 235         BIT(ACOMPAT, 'C');
 236         BIT(ACORE, 'D');
 237         BIT(AXSIG, 'X');
 238         *p = '\0';
 239         return (flags);
 240 }
 241
 242 int
 243 requested(char *argv[], struct acct *acp)
 244 {
 245         const char *p;
 246
 247         do {
 248                 p = user_from_uid(acp->ac_uid, 0);
 249                 if (!strcmp(p, *argv))
 250                         return (1);
 251                 if ((p = getdev(acp->ac_tty)) && !strcmp(p, *argv))
 252                         return (1);
 253                 if (!strncmp(acp->ac_comm, *argv, AC_COMM_LEN))
 254                         return (1);
 255         } while (*++argv);
 256         return (0);
 257 }
 258
 259 const char *
 260 getdev(dev_t dev)
 261 {
 262         static dev_t lastdev = (dev_t)-1;
 263         static const char *lastname;
 264
 265         if (dev == NODEV)                       /* Special case. */
 266                 return ("__");
 267         if (dev == lastdev)                     /* One-element cache. */
 268                 return (lastname);
 269         lastdev = dev;
 270         lastname = devname(dev, S_IFCHR);
 271         return (lastname);
 272 }
 273
 274 static void
 275 usage(void)
 276 {
 277         (void)fprintf(stderr,
 278 "usage: lastcomm [-EScesu] [-f file] [command ...] [user ...] [terminal ...]\n");
 279         exit(1);
 280 }