lastcomm.c revision 50477 
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
34#ifndef lint
35static char copyright[] =
36"@(#) Copyright (c) 1980, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)lastcomm.c	8.1 (Berkeley) 6/6/93";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/usr.bin/lastcomm/lastcomm.c 50477 1999-08-28 01:08:13Z peter $";
46#endif /* not lint */
47
48#include <sys/param.h>
49#include <sys/stat.h>
50#include <sys/acct.h>
51
52#include <ctype.h>
53#include <err.h>
54#include <fcntl.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58#include <struct.h>
59#include <unistd.h>
60#include <utmp.h>
61#include "pathnames.h"
62
63time_t	 expand __P((u_int));
64char	*flagbits __P((int));
65char	*getdev __P((dev_t));
66int	 requested __P((char *[], struct acct *));
67static void	 usage __P((void));
68char	*user_from_uid();
69
70#define AC_UTIME 1 /* user */
71#define AC_STIME 2 /* system */
72#define AC_ETIME 4 /* elapsed */
73#define AC_CTIME 8 /* user + system time, default */
74
75#define AC_BTIME 16 /* starting time */
76#define AC_FTIME 32 /* exit time (starting time + elapsed time )*/
77
78#define AC_HZ ((double)AHZ)
79
80int
81main(argc, argv)
82	int argc;
83	char *argv[];
84{
85	register char *p;
86	struct acct ab;
87	struct stat sb;
88	FILE *fp;
89	off_t size;
90	time_t t;
91	int ch;
92	char *acctfile;
93	int time = 0;
94
95	acctfile = _PATH_ACCT;
96	while ((ch = getopt(argc, argv, "f:usecSE")) != -1)
97		switch((char)ch) {
98		case 'f':
99			acctfile = optarg;
100			break;
101
102		case 'u':
103			time |= AC_UTIME; /* user time */
104			break;
105		case 's':
106			time |= AC_STIME; /* system time */
107			break;
108		case 'e':
109			time |= AC_ETIME; /* elapsed time */
110			break;
111        	case 'c':
112                        time |= AC_CTIME; /* user + system time */
113			break;
114
115        	case 'S':
116                        time |= AC_BTIME; /* starting time */
117			break;
118        	case 'E':
119			/* exit time (starting time + elapsed time )*/
120                        time |= AC_FTIME;
121			break;
122
123		case '?':
124		default:
125			usage();
126		}
127
128	/* default user + system time and starting time */
129	if (!time) {
130	    time = AC_CTIME | AC_BTIME;
131	}
132
133	argc -= optind;
134	argv += optind;
135
136	/* Open the file. */
137	if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
138		err(1, "%s", acctfile);
139
140	/*
141	 * Round off to integral number of accounting records, probably
142	 * not necessary, but it doesn't hurt.
143	 */
144	size = sb.st_size - sb.st_size % sizeof(struct acct);
145
146	/* Check if any records to display. */
147	if (size < sizeof(struct acct))
148		exit(0);
149
150	/*
151	 * Seek to before the last entry in the file; use lseek(2) in case
152	 * the file is bigger than a "long".
153	 */
154	size -= sizeof(struct acct);
155	if (lseek(fileno(fp), size, SEEK_SET) == -1)
156		err(1, "%s", acctfile);
157
158	for (;;) {
159		if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
160			err(1, "%s", acctfile);
161
162		if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
163			err(1, "%s", acctfile);
164
165		if (size == 0)
166			break;
167		size -= sizeof(struct acct);
168
169		if (ab.ac_comm[0] == '\0') {
170			ab.ac_comm[0] = '?';
171			ab.ac_comm[1] = '\0';
172		} else
173			for (p = &ab.ac_comm[0];
174			    p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
175				if (!isprint(*p))
176					*p = '?';
177		if (*argv && !requested(argv, &ab))
178			continue;
179
180		(void)printf("%-*.*s %-7s %-*s %-*s ",
181			     fldsiz(acct, ac_comm),
182			     fldsiz(acct, ac_comm), ab.ac_comm,
183			     flagbits(ab.ac_flag),
184			     UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
185			     UT_LINESIZE, getdev(ab.ac_tty));
186
187
188		/* user + system time */
189		if (time & AC_CTIME) {
190			(void)printf("%6.2f secs ",
191				     (expand(ab.ac_utime) +
192				      expand(ab.ac_stime))/AC_HZ);
193		}
194
195		/* usr time */
196		if (time & AC_UTIME) {
197			(void)printf("%6.2f us ", expand(ab.ac_utime)/AC_HZ);
198		}
199
200		/* system time */
201		if (time & AC_STIME) {
202			(void)printf("%6.2f sy ", expand(ab.ac_stime)/AC_HZ);
203		}
204
205		/* elapsed time */
206		if (time & AC_ETIME) {
207			(void)printf("%8.2f es ", expand(ab.ac_etime)/AC_HZ);
208		}
209
210		/* starting time */
211		if (time & AC_BTIME) {
212			(void)printf("%.16s ", ctime(&ab.ac_btime));
213		}
214
215		/* exit time (starting time + elapsed time )*/
216		if (time & AC_FTIME) {
217			t = ab.ac_btime;
218			t += (time_t)(expand(ab.ac_etime)/AC_HZ);
219			(void)printf("%.16s ",
220				     ctime(&t));
221		}
222		printf("\n");
223 	}
224 	exit(0);
225}
226
227time_t
228expand(t)
229	u_int t;
230{
231	register time_t nt;
232
233	nt = t & 017777;
234	t >>= 13;
235	while (t) {
236		t--;
237		nt <<= 3;
238	}
239	return (nt);
240}
241
242char *
243flagbits(f)
244	register int f;
245{
246	static char flags[20] = "-";
247	char *p;
248
249#define	BIT(flag, ch)	if (f & flag) *p++ = ch
250
251	p = flags + 1;
252	BIT(ASU, 'S');
253	BIT(AFORK, 'F');
254	BIT(ACOMPAT, 'C');
255	BIT(ACORE, 'D');
256	BIT(AXSIG, 'X');
257	*p = '\0';
258	return (flags);
259}
260
261int
262requested(argv, acp)
263	register char *argv[];
264	register struct acct *acp;
265{
266	register char *p;
267
268	do {
269		p = user_from_uid(acp->ac_uid, 0);
270		if (!strcmp(p, *argv))
271			return (1);
272		if ((p = getdev(acp->ac_tty)) && !strcmp(p, *argv))
273			return (1);
274		if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
275			return (1);
276	} while (*++argv);
277	return (0);
278}
279
280char *
281getdev(dev)
282	dev_t dev;
283{
284	static dev_t lastdev = (dev_t)-1;
285	static char *lastname;
286
287	if (dev == NODEV)			/* Special case. */
288		return ("__");
289	if (dev == lastdev)			/* One-element cache. */
290		return (lastname);
291	lastdev = dev;
292	lastname = devname(dev, S_IFCHR);
293	return (lastname);
294}
295
296static void
297usage()
298{
299	(void)fprintf(stderr,
300"usage: lastcomm [-EScesu] [ -f file ] [command ...] [user ...] [tty ...]\n");
301	exit(1);
302}
303