1 /*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char copyright[] =
10 "@(#) Copyright (c) 1980, 1993\n\
11 The Regents of the University of California. All rights reserved.\n";
12 #endif /* not lint */
13
14 #ifndef lint
15 static char sccsid[] = "@(#)lastcomm.c 8.2 (Berkeley) 04/29/95";
16 #endif /* not lint */
17
18 #include <sys/param.h>
19 #include <sys/stat.h>
20 #include <sys/acct.h>
21
22 #include <ctype.h>
23 #include <err.h>
24 #include <fcntl.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <struct.h>
29 #include <unistd.h>
30 #include <utmp.h>
31 #include "pathnames.h"
32
33 time_t expand __P((u_int));
34 char *flagbits __P((int));
35 char *getdev __P((dev_t));
36 int requested __P((char *[], struct acct *));
37 void usage __P((void));
38 char *user_from_uid();
39
40 int
main(argc,argv)41 main(argc, argv)
42 int argc;
43 char *argv[];
44 {
45 register char *p;
46 struct acct ab;
47 struct stat sb;
48 FILE *fp;
49 off_t size;
50 time_t t;
51 int ch;
52 char *acctfile;
53
54 acctfile = _PATH_ACCT;
55 while ((ch = getopt(argc, argv, "f:")) != EOF)
56 switch((char)ch) {
57 case 'f':
58 acctfile = optarg;
59 break;
60 case '?':
61 default:
62 usage();
63 }
64 argc -= optind;
65 argv += optind;
66
67 /* Open the file. */
68 if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
69 err(1, "%s", acctfile);
70
71 /*
72 * Round off to integral number of accounting records, probably
73 * not necessary, but it doesn't hurt.
74 */
75 size = sb.st_size - sb.st_size % sizeof(struct acct);
76
77 /* Check if any records to display. */
78 if (size < sizeof(struct acct))
79 exit(0);
80
81 /*
82 * Seek to before the last entry in the file; use lseek(2) in case
83 * the file is bigger than a "long".
84 */
85 size -= sizeof(struct acct);
86 if (lseek(fileno(fp), size, SEEK_SET) == -1)
87 err(1, "%s", acctfile);
88
89 for (;;) {
90 if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
91 err(1, "%s", acctfile);
92
93 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
94 err(1, "%s", acctfile);
95
96 if (size == 0)
97 break;
98 size -= sizeof(struct acct);
99
100 if (ab.ac_comm[0] == '\0') {
101 ab.ac_comm[0] = '?';
102 ab.ac_comm[1] = '\0';
103 } else
104 for (p = &ab.ac_comm[0];
105 p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
106 if (!isprint(*p))
107 *p = '?';
108 if (*argv && !requested(argv, &ab))
109 continue;
110
111 t = expand(ab.ac_utime) + expand(ab.ac_stime);
112 (void)printf("%-*s %-7s %-*s %-*s %6.2f secs %.16s\n",
113 fldsiz(acct, ac_comm), ab.ac_comm, flagbits(ab.ac_flag),
114 UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
115 UT_LINESIZE, getdev(ab.ac_tty),
116 t / (double)AHZ, ctime(&ab.ac_btime));
117 }
118 exit(0);
119 }
120
121 time_t
expand(t)122 expand(t)
123 u_int t;
124 {
125 register time_t nt;
126
127 nt = t & 017777;
128 t >>= 13;
129 while (t) {
130 t--;
131 nt <<= 3;
132 }
133 return (nt);
134 }
135
136 char *
flagbits(f)137 flagbits(f)
138 register int f;
139 {
140 static char flags[20] = "-";
141 char *p;
142
143 #define BIT(flag, ch) if (f & flag) *p++ = ch
144
145 p = flags + 1;
146 BIT(ASU, 'S');
147 BIT(AFORK, 'F');
148 BIT(ACOMPAT, 'C');
149 BIT(ACORE, 'D');
150 BIT(AXSIG, 'X');
151 *p = '\0';
152 return (flags);
153 }
154
155 int
requested(argv,acp)156 requested(argv, acp)
157 register char *argv[];
158 register struct acct *acp;
159 {
160 do {
161 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
162 return (1);
163 if (!strcmp(getdev(acp->ac_tty), *argv))
164 return (1);
165 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
166 return (1);
167 } while (*++argv);
168 return (0);
169 }
170
171 char *
getdev(dev)172 getdev(dev)
173 dev_t dev;
174 {
175 static dev_t lastdev = (dev_t)-1;
176 static char *lastname;
177
178 if (dev == NODEV) /* Special case. */
179 return ("__");
180 if (dev == lastdev) /* One-element cache. */
181 return (lastname);
182 lastdev = dev;
183 if ((lastname = devname(dev, S_IFCHR)) == NULL)
184 lastname = "??";
185 return (lastname);
186 }
187
188 void
usage()189 usage()
190 {
191 (void)fprintf(stderr,
192 "lastcomm [ -f file ] [command ...] [user ...] [tty ...]\n");
193 exit(1);
194 }
195