lastcomm.c revision 1.2 
1/*	$NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#ifndef lint
37static char copyright[] =
38"@(#) Copyright (c) 1980, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "@(#)lastcomm.c	8.2 (Berkeley) 4/29/95";
45#endif
46static char rcsid[] = "$NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson Exp $";
47#endif /* not lint */
48
49#include <sys/param.h>
50#include <sys/stat.h>
51#include <sys/acct.h>
52
53#include <ctype.h>
54#include <err.h>
55#include <fcntl.h>
56#include <math.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <struct.h>
61#include <tzfile.h>
62#include <unistd.h>
63#include <utmp.h>
64#include "pathnames.h"
65
66time_t	 expand __P((u_int));
67char	*flagbits __P((int));
68char	*getdev __P((dev_t));
69int	 requested __P((char *[], struct acct *));
70void	 usage __P((void));
71char	*user_from_uid();
72
73int
74main(argc, argv)
75	int argc;
76	char *argv[];
77{
78	register char *p;
79	struct acct ab;
80	struct stat sb;
81	FILE *fp;
82	off_t size;
83	time_t t;
84	double delta;
85	int ch;
86	char *acctfile;
87
88	acctfile = _PATH_ACCT;
89	while ((ch = getopt(argc, argv, "f:")) != EOF)
90		switch((char)ch) {
91		case 'f':
92			acctfile = optarg;
93			break;
94		case '?':
95		default:
96			usage();
97		}
98	argc -= optind;
99	argv += optind;
100
101	/* Open the file. */
102	if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
103		err(1, "%s", acctfile);
104
105	/*
106	 * Round off to integral number of accounting records, probably
107	 * not necessary, but it doesn't hurt.
108	 */
109	size = sb.st_size - sb.st_size % sizeof(struct acct);
110
111	/* Check if any records to display. */
112	if (size < sizeof(struct acct))
113		exit(0);
114
115	/*
116	 * Seek to before the last entry in the file; use lseek(2) in case
117	 * the file is bigger than a "long".
118	 */
119	size -= sizeof(struct acct);
120	if (lseek(fileno(fp), size, SEEK_SET) == -1)
121		err(1, "%s", acctfile);
122
123	for (;;) {
124		if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
125			err(1, "%s", acctfile);
126
127		if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
128			err(1, "%s", acctfile);
129
130		if (size == 0)
131			break;
132		size -= sizeof(struct acct);
133
134		if (ab.ac_comm[0] == '\0') {
135			ab.ac_comm[0] = '?';
136			ab.ac_comm[1] = '\0';
137		} else
138			for (p = &ab.ac_comm[0];
139			    p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
140				if (!isprint(*p))
141					*p = '?';
142		if (*argv && !requested(argv, &ab))
143			continue;
144
145		t = expand(ab.ac_utime) + expand(ab.ac_stime);
146		(void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
147		    fldsiz(acct, ac_comm), fldsiz(acct, ac_comm), ab.ac_comm,
148		    flagbits(ab.ac_flag), UT_NAMESIZE, UT_NAMESIZE,
149		    user_from_uid(ab.ac_uid, 0), UT_LINESIZE, UT_LINESIZE,
150		    getdev(ab.ac_tty), t / (double)AHZ, ctime(&ab.ac_btime));
151		delta = expand(ab.ac_etime) / (double)AHZ;
152		printf(" (%1.0lf:%02.0lf:%05.2lf)\n",
153		    delta / SECSPERHOUR,
154		    fmod(delta, SECSPERHOUR) / SECSPERMIN,
155		    fmod(delta, SECSPERMIN));
156	}
157	exit(0);
158}
159
160time_t
161expand(t)
162	u_int t;
163{
164	register time_t nt;
165
166	nt = t & 017777;
167	t >>= 13;
168	while (t) {
169		t--;
170		nt <<= 3;
171	}
172	return (nt);
173}
174
175char *
176flagbits(f)
177	register int f;
178{
179	static char flags[20] = "-";
180	char *p;
181
182#define	BIT(flag, ch)	if (f & flag) *p++ = ch
183
184	p = flags + 1;
185	BIT(ASU, 'S');
186	BIT(AFORK, 'F');
187	BIT(ACOMPAT, 'C');
188	BIT(ACORE, 'D');
189	BIT(AXSIG, 'X');
190	*p = '\0';
191	return (flags);
192}
193
194int
195requested(argv, acp)
196	register char *argv[];
197	register 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
210char *
211getdev(dev)
212	dev_t dev;
213{
214	static dev_t lastdev = (dev_t)-1;
215	static char *lastname;
216
217	if (dev == NODEV)			/* Special case. */
218		return ("__");
219	if (dev == lastdev)			/* One-element cache. */
220		return (lastname);
221	lastdev = dev;
222	if ((lastname = devname(dev, S_IFCHR)) == NULL)
223		lastname = "??";
224	return (lastname);
225}
226
227void
228usage()
229{
230	(void)fprintf(stderr,
231	    "lastcomm [ -f file ] [command ...] [user ...] [tty ...]\n");
232	exit(1);
233}
234