lastcomm.c revision 1.4 
1/*	$OpenBSD: lastcomm.c,v 1.4 1997/01/15 23:42:41 millert Exp $	*/
2/*	$NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson Exp $	*/
3
4/*
5 * Copyright (c) 1980, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static char copyright[] =
39"@(#) Copyright (c) 1980, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)lastcomm.c	8.2 (Berkeley) 4/29/95";
46#endif
47static char rcsid[] = "$OpenBSD: lastcomm.c,v 1.4 1997/01/15 23:42:41 millert Exp $";
48#endif /* not lint */
49
50#include <sys/param.h>
51#include <sys/stat.h>
52#include <sys/acct.h>
53
54#include <ctype.h>
55#include <err.h>
56#include <fcntl.h>
57#include <math.h>
58#include <stdio.h>
59#include <stdlib.h>
60#include <string.h>
61#include <struct.h>
62#include <tzfile.h>
63#include <unistd.h>
64#include <utmp.h>
65#include "pathnames.h"
66
67time_t	 expand __P((u_int));
68char	*flagbits __P((int));
69char	*getdev __P((dev_t));
70int	 requested __P((char *[], struct acct *));
71void	 usage __P((void));
72char	*user_from_uid();
73
74int
75main(argc, argv)
76	int argc;
77	char *argv[];
78{
79	register char *p;
80	struct acct ab;
81	struct stat sb;
82	FILE *fp;
83	off_t size;
84	time_t t;
85	double delta;
86	int ch;
87	char *acctfile;
88
89	acctfile = _PATH_ACCT;
90	while ((ch = getopt(argc, argv, "f:")) != -1)
91		switch((char)ch) {
92		case 'f':
93			acctfile = optarg;
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(struct acct);
111
112	/* Check if any records to display. */
113	if (size < sizeof(struct acct))
114		exit(0);
115
116	/*
117	 * Seek to before the last entry in the file; use lseek(2) in case
118	 * the file is bigger than a "long".
119	 */
120	size -= sizeof(struct acct);
121	if (lseek(fileno(fp), size, SEEK_SET) == -1)
122		err(1, "%s", acctfile);
123
124	for (;;) {
125		if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
126			err(1, "%s", acctfile);
127
128		if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
129			err(1, "%s", acctfile);
130
131		if (size == 0)
132			break;
133		size -= sizeof(struct acct);
134
135		if (ab.ac_comm[0] == '\0') {
136			ab.ac_comm[0] = '?';
137			ab.ac_comm[1] = '\0';
138		} else
139			for (p = &ab.ac_comm[0];
140			    p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
141				if (!isprint(*p))
142					*p = '?';
143		if (*argv && !requested(argv, &ab))
144			continue;
145
146		t = expand(ab.ac_utime) + expand(ab.ac_stime);
147		(void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
148		    fldsiz(acct, ac_comm), fldsiz(acct, ac_comm), ab.ac_comm,
149		    flagbits(ab.ac_flag), UT_NAMESIZE, UT_NAMESIZE,
150		    user_from_uid(ab.ac_uid, 0), UT_LINESIZE, UT_LINESIZE,
151		    getdev(ab.ac_tty), t / (double)AHZ, ctime(&ab.ac_btime));
152		delta = expand(ab.ac_etime) / (double)AHZ;
153		printf(" (%1.0lf:%02.0lf:%05.2lf)\n",
154		    delta / SECSPERHOUR,
155		    fmod(delta, SECSPERHOUR) / SECSPERMIN,
156		    fmod(delta, SECSPERMIN));
157	}
158	exit(0);
159}
160
161time_t
162expand(t)
163	u_int t;
164{
165	register time_t nt;
166
167	nt = t & 017777;
168	t >>= 13;
169	while (t) {
170		t--;
171		nt <<= 3;
172	}
173	return (nt);
174}
175
176char *
177flagbits(f)
178	register int f;
179{
180	static char flags[20] = "-";
181	char *p;
182
183#define	BIT(flag, ch)	if (f & flag) *p++ = ch
184
185	p = flags + 1;
186	BIT(ASU, 'S');
187	BIT(AFORK, 'F');
188	BIT(ACOMPAT, 'C');
189	BIT(ACORE, 'D');
190	BIT(AXSIG, 'X');
191	*p = '\0';
192	return (flags);
193}
194
195int
196requested(argv, acp)
197	register char *argv[];
198	register struct acct *acp;
199{
200	do {
201		if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
202			return (1);
203		if (!strcmp(getdev(acp->ac_tty), *argv))
204			return (1);
205		if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
206			return (1);
207	} while (*++argv);
208	return (0);
209}
210
211char *
212getdev(dev)
213	dev_t dev;
214{
215	static dev_t lastdev = (dev_t)-1;
216	static char *lastname;
217
218	if (dev == NODEV)			/* Special case. */
219		return ("__");
220	if (dev == lastdev)			/* One-element cache. */
221		return (lastname);
222	lastdev = dev;
223	if ((lastname = devname(dev, S_IFCHR)) == NULL)
224		lastname = "??";
225	return (lastname);
226}
227
228void
229usage()
230{
231	(void)fprintf(stderr,
232	    "lastcomm [ -f file ] [command ...] [user ...] [tty ...]\n");
233	exit(1);
234}
235