xref: /netbsd-src/usr.bin/lastcomm/lastcomm.c (revision 8599966dc671c937a389946f22b07284dcf47da8)
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