1 /* $NetBSD: lastcomm.c,v 1.23 2012/01/31 21:53:42 wiz Exp $ */
2
3 /*
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1980, 1993\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)lastcomm.c 8.2 (Berkeley) 4/29/95";
41 #endif
42 __RCSID("$NetBSD: lastcomm.c,v 1.23 2012/01/31 21:53:42 wiz Exp $");
43 #endif /* not lint */
44
45 #include <sys/param.h>
46 #include <sys/stat.h>
47 #include <sys/acct.h>
48
49 #include <ctype.h>
50 #include <err.h>
51 #include <fcntl.h>
52 #include <math.h>
53 #include <pwd.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <struct.h>
58 #include <time.h>
59 #include <tzfile.h>
60 #include <unistd.h>
61 #include <utmp.h>
62 #include "pathnames.h"
63
64 static time_t expand(u_int);
65 static char *flagbits(int);
66 static const char *getdev(dev_t);
67 static int requested(char *[], const struct acct *);
68 static void usage(void) __dead;
69
70 int
main(int argc,char * argv[])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 double delta;
80 int ch, wflag, lwidth;
81 const char *acctfile = _PATH_ACCT;
82
83 setprogname(argv[0]);
84 wflag = 0;
85 lwidth = -6;
86
87 while ((ch = getopt(argc, argv, "f:w")) != -1)
88 switch((char)ch) {
89 case 'f':
90 acctfile = optarg;
91 break;
92 case 'w':
93 wflag = 1;
94 break;
95 case '?':
96 default:
97 usage();
98 }
99 argc -= optind;
100 argv += optind;
101
102 /* Open the file. */
103 if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
104 err(1, "%s", acctfile);
105
106 /*
107 * Round off to integral number of accounting records, probably
108 * not necessary, but it doesn't hurt.
109 */
110 size = sb.st_size - sb.st_size % sizeof(ab);
111
112 /* Check if any records to display. */
113 if (size < (off_t)sizeof(ab))
114 return 0;
115
116 size -= sizeof(ab);
117 if (fseeko(fp, size, SEEK_SET) == -1)
118 err(1, "%s", acctfile);
119
120 lwidth = (int)fldsiz(acct, ac_comm) - ((wflag)? 0: 6);
121 for (;;) {
122 if (fread(&ab, sizeof(ab), 1, fp) != 1)
123 err(1, "%s", acctfile);
124
125 if (ab.ac_comm[0] == '\0') {
126 ab.ac_comm[0] = '?';
127 ab.ac_comm[1] = '\0';
128 } else
129 for (p = &ab.ac_comm[0];
130 p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
131 if (!isprint((unsigned char)*p))
132 *p = '?';
133 if (!*argv || requested(argv, &ab)) {
134
135 if (!wflag)
136 ab.ac_comm[10] = '\0';
137 t = expand(ab.ac_utime) + expand(ab.ac_stime);
138 (void)printf(
139 "%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
140 lwidth, lwidth,
141 ab.ac_comm, flagbits(ab.ac_flag),
142 UT_NAMESIZE, UT_NAMESIZE,
143 user_from_uid(ab.ac_uid, 0), UT_LINESIZE,
144 UT_LINESIZE, getdev(ab.ac_tty),
145 t / (double)AHZ, ctime(&ab.ac_btime));
146 delta = expand(ab.ac_etime) / (double)AHZ;
147 (void)printf(" (%1.0f:%02.0f:%05.2f)\n",
148 floor(delta / SECSPERHOUR),
149 floor(fmod(delta, SECSPERHOUR) / SECSPERMIN),
150 fmod(delta, SECSPERMIN));
151 }
152 /* are we at the beginning of the file yet? */
153 if (size == 0)
154 break;
155 /* seek backward over the one we read and the next to read */
156 if (fseeko(fp, 2 * -(off_t)sizeof(ab), SEEK_CUR) == -1)
157 err(1, "%s", acctfile);
158 /* and account for its size */
159 size -= sizeof(ab);
160 }
161 return 0;
162 }
163
164 static time_t
expand(u_int t)165 expand(u_int t)
166 {
167 time_t nt;
168
169 nt = t & 017777;
170 t >>= 13;
171 while (t) {
172 t--;
173 nt <<= 3;
174 }
175 return nt;
176 }
177
178 static char *
flagbits(int f)179 flagbits(int f)
180 {
181 static char flags[20] = "-";
182 char *p;
183
184 #define BIT(flag, ch) if (f & flag) *p++ = ch
185
186 p = flags + 1;
187 BIT(ASU, 'S');
188 BIT(AFORK, 'F');
189 BIT(ACOMPAT, 'C');
190 BIT(ACORE, 'D');
191 BIT(AXSIG, 'X');
192 *p = '\0';
193 return flags;
194 }
195
196 static int
requested(char * argv[],const struct acct * acp)197 requested(char *argv[], const struct acct *acp)
198 {
199 do {
200 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
201 return 1;
202 if (!strcmp(getdev(acp->ac_tty), *argv))
203 return 1;
204 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
205 return 1;
206 } while (*++argv);
207 return 0;
208 }
209
210 static const char *
getdev(dev_t dev)211 getdev(dev_t dev)
212 {
213 static dev_t lastdev = NODEV;
214 static const char *lastname;
215
216 if (dev == NODEV) /* Special case. */
217 return "__";
218 if (dev == lastdev) /* One-element cache. */
219 return lastname;
220 if ((lastname = devname(dev, S_IFCHR)) != NULL)
221 return lastname;
222 return "??";
223 }
224
225 static void
usage(void)226 usage(void)
227 {
228 (void)fprintf(stderr,
229 "Usage: %s [-w] [-f file] [command ...] [user ...] [terminal ...]\n",
230 getprogname());
231 exit(1);
232 }
233