lastcomm.c revision 92920 
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 const 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 92920 2002-03-22 01:22:50Z imp $";
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 <pwd.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60#include <utmp.h>
61#include "pathnames.h"
62
63time_t	 expand(u_int);
64char	*flagbits(int);
65const	 char *getdev(dev_t);
66int	 requested(char *[], struct acct *);
67static	 void usage(void);
68
69#define AC_UTIME 1 /* user */
70#define AC_STIME 2 /* system */
71#define AC_ETIME 4 /* elapsed */
72#define AC_CTIME 8 /* user + system time, default */
73
74#define AC_BTIME 16 /* starting time */
75#define AC_FTIME 32 /* exit time (starting time + elapsed time )*/
76
77#define AC_HZ ((double)AHZ)
78
79int
80main(argc, argv)
81	int argc;
82	char *argv[];
83{
84	char *p;
85	struct acct ab;
86	struct stat sb;
87	FILE *fp;
88	off_t size;
89	time_t t;
90	int ch;
91	const char *acctfile;
92	int flags = 0;
93
94	acctfile = _PATH_ACCT;
95	while ((ch = getopt(argc, argv, "f:usecSE")) != -1)
96		switch((char)ch) {
97		case 'f':
98			acctfile = optarg;
99			break;
100
101		case 'u':
102			flags |= AC_UTIME; /* user time */
103			break;
104		case 's':
105			flags |= AC_STIME; /* system time */
106			break;
107		case 'e':
108			flags |= AC_ETIME; /* elapsed time */
109			break;
110        	case 'c':
111                        flags |= AC_CTIME; /* user + system time */
112			break;
113
114        	case 'S':
115                        flags |= AC_BTIME; /* starting time */
116			break;
117        	case 'E':
118			/* exit time (starting time + elapsed time )*/
119                        flags |= AC_FTIME;
120			break;
121
122		case '?':
123		default:
124			usage();
125		}
126
127	/* default user + system time and starting time */
128	if (!flags) {
129	    flags = AC_CTIME | AC_BTIME;
130	}
131
132	argc -= optind;
133	argv += optind;
134
135	/* Open the file. */
136	if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
137		err(1, "%s", acctfile);
138
139	/*
140	 * Round off to integral number of accounting records, probably
141	 * not necessary, but it doesn't hurt.
142	 */
143	size = sb.st_size - sb.st_size % sizeof(struct acct);
144
145	/* Check if any records to display. */
146	if ((unsigned)size < sizeof(struct acct))
147		exit(0);
148
149	/*
150	 * Seek to before the last entry in the file; use lseek(2) in case
151	 * the file is bigger than a "long".
152	 */
153	size -= sizeof(struct acct);
154	if (lseek(fileno(fp), size, SEEK_SET) == -1)
155		err(1, "%s", acctfile);
156
157	for (;;) {
158		if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
159			err(1, "%s", acctfile);
160
161		if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
162			err(1, "%s", acctfile);
163
164		if (size == 0)
165			break;
166		size -= sizeof(struct acct);
167
168		if (ab.ac_comm[0] == '\0') {
169			ab.ac_comm[0] = '?';
170			ab.ac_comm[1] = '\0';
171		} else
172			for (p = &ab.ac_comm[0];
173			    p < &ab.ac_comm[AC_COMM_LEN] && *p; ++p)
174				if (!isprint(*p))
175					*p = '?';
176		if (*argv && !requested(argv, &ab))
177			continue;
178
179		(void)printf("%-*.*s %-7s %-*s %-*s",
180			     AC_COMM_LEN, AC_COMM_LEN, ab.ac_comm,
181			     flagbits(ab.ac_flag),
182			     UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
183			     UT_LINESIZE, getdev(ab.ac_tty));
184
185
186		/* user + system time */
187		if (flags & AC_CTIME) {
188			(void)printf(" %6.2f secs",
189				     (expand(ab.ac_utime) +
190				      expand(ab.ac_stime))/AC_HZ);
191		}
192
193		/* usr time */
194		if (flags & AC_UTIME) {
195			(void)printf(" %6.2f us", expand(ab.ac_utime)/AC_HZ);
196		}
197
198		/* system time */
199		if (flags & AC_STIME) {
200			(void)printf(" %6.2f sy", expand(ab.ac_stime)/AC_HZ);
201		}
202
203		/* elapsed time */
204		if (flags & AC_ETIME) {
205			(void)printf(" %8.2f es", expand(ab.ac_etime)/AC_HZ);
206		}
207
208		/* starting time */
209		if (flags & AC_BTIME) {
210			(void)printf(" %.16s", ctime(&ab.ac_btime));
211		}
212
213		/* exit time (starting time + elapsed time )*/
214		if (flags & AC_FTIME) {
215			t = ab.ac_btime;
216			t += (time_t)(expand(ab.ac_etime)/AC_HZ);
217			(void)printf(" %.16s", ctime(&t));
218		}
219		printf("\n");
220 	}
221 	exit(0);
222}
223
224time_t
225expand(t)
226	u_int t;
227{
228	time_t nt;
229
230	nt = t & 017777;
231	t >>= 13;
232	while (t) {
233		t--;
234		nt <<= 3;
235	}
236	return (nt);
237}
238
239char *
240flagbits(f)
241	int f;
242{
243	static char flags[20] = "-";
244	char *p;
245
246#define	BIT(flag, ch)	if (f & flag) *p++ = ch
247
248	p = flags + 1;
249	BIT(ASU, 'S');
250	BIT(AFORK, 'F');
251	BIT(ACOMPAT, 'C');
252	BIT(ACORE, 'D');
253	BIT(AXSIG, 'X');
254	*p = '\0';
255	return (flags);
256}
257
258int
259requested(argv, acp)
260	char *argv[];
261	struct acct *acp;
262{
263	const char *p;
264
265	do {
266		p = user_from_uid(acp->ac_uid, 0);
267		if (!strcmp(p, *argv))
268			return (1);
269		if ((p = getdev(acp->ac_tty)) && !strcmp(p, *argv))
270			return (1);
271		if (!strncmp(acp->ac_comm, *argv, AC_COMM_LEN))
272			return (1);
273	} while (*++argv);
274	return (0);
275}
276
277const char *
278getdev(dev)
279	dev_t dev;
280{
281	static dev_t lastdev = (dev_t)-1;
282	static const char *lastname;
283
284	if (dev == NODEV)			/* Special case. */
285		return ("__");
286	if (dev == lastdev)			/* One-element cache. */
287		return (lastname);
288	lastdev = dev;
289	lastname = devname(dev, S_IFCHR);
290	return (lastname);
291}
292
293static void
294usage()
295{
296	(void)fprintf(stderr,
297"usage: lastcomm [-EScesu] [ -f file ] [command ...] [user ...] [tty ...]\n");
298	exit(1);
299}
300