1/* $NetBSD: lastcomm.c,v 1.21 2009/04/12 13:08:31 lukem 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 40static char sccsid[] = "@(#)lastcomm.c 8.2 (Berkeley) 4/29/95"; 41#endif 42__RCSID("$NetBSD: lastcomm.c,v 1.21 2009/04/12 13:08:31 lukem 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/* definitions from utmp.h */ 62#define UT_NAMESIZE 8 63#define UT_LINESIZE 8 64#include "pathnames.h" 65 66static time_t expand(u_int); 67static char *flagbits(int); 68static const char *getdev(dev_t); 69static int requested(char *[], struct acct *); 70static void usage(void) __dead; 71 72int main(int, char **); 73 74int 75main(int argc, char *argv[]) 76{ 77 char *p; 78 struct acct ab; 79 struct stat sb; 80 FILE *fp; 81 off_t size; 82 time_t t; 83 double delta; 84 int ch; 85 const char *acctfile = _PATH_ACCT; 86 87 setprogname(argv[0]); 88 89 while ((ch = getopt(argc, argv, "f:")) != -1) 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 < (off_t)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 (ab.ac_comm[0] == '\0') { 128 ab.ac_comm[0] = '?'; 129 ab.ac_comm[1] = '\0'; 130 } else 131 for (p = &ab.ac_comm[0]; 132 p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p) 133 if (!isprint((unsigned char)*p)) 134 *p = '?'; 135 if (!*argv || requested(argv, &ab)) { 136 137 t = expand(ab.ac_utime) + expand(ab.ac_stime); 138 (void)printf( 139 "%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s", 140 (int)fldsiz(acct, ac_comm), 141 (int)fldsiz(acct, ac_comm), 142 ab.ac_comm, flagbits(ab.ac_flag), 143 UT_NAMESIZE, UT_NAMESIZE, 144 user_from_uid(ab.ac_uid, 0), UT_LINESIZE, 145 UT_LINESIZE, getdev(ab.ac_tty), 146 t / (double)AHZ, ctime(&ab.ac_btime)); 147 delta = expand(ab.ac_etime) / (double)AHZ; 148 printf(" (%1.0f:%02.0f:%05.2f)\n", 149 floor(delta / SECSPERHOUR), 150 floor(fmod(delta, SECSPERHOUR) / SECSPERMIN), 151 fmod(delta, SECSPERMIN)); 152 } 153 /* are we at the beginning of the file yet? */ 154 if (size == 0) 155 break; 156 /* seek backward over the one we read and the next to read */ 157 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1) 158 err(1, "%s", acctfile); 159 /* and account for its size */ 160 size -= sizeof(struct acct); 161 } 162 exit(0); 163} 164 165static time_t 166expand(u_int t) 167{ 168 time_t nt; 169 170 nt = t & 017777; 171 t >>= 13; 172 while (t) { 173 t--; 174 nt <<= 3; 175 } 176 return (nt); 177} 178 179static char * 180flagbits(int f) 181{ 182 static char flags[20] = "-"; 183 char *p; 184 185#define BIT(flag, ch) if (f & flag) *p++ = ch 186 187 p = flags + 1; 188 BIT(ASU, 'S'); 189 BIT(AFORK, 'F'); 190 BIT(ACOMPAT, 'C'); 191 BIT(ACORE, 'D'); 192 BIT(AXSIG, 'X'); 193 *p = '\0'; 194 return (flags); 195} 196 197static int 198requested(char *argv[], 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 211static const char * 212getdev(dev_t dev) 213{ 214 static dev_t lastdev = (dev_t)-1; 215 static const 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 227static void 228usage(void) 229{ 230 (void)fprintf(stderr, 231 "Usage: %s [ -f file ] [command ...] [user ...] [tty ...]\n", 232 getprogname()); 233 exit(1); 234} 235