1 /* $NetBSD: lastcomm.c,v 1.10 1997/05/19 10:01:52 kleink 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 37 static 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 44 static char sccsid[] = "@(#)lastcomm.c 8.2 (Berkeley) 4/29/95"; 45 #endif 46 static char rcsid[] = "$NetBSD: lastcomm.c,v 1.10 1997/05/19 10:01:52 kleink 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 66 time_t expand __P((u_int)); 67 char *flagbits __P((int)); 68 char *getdev __P((dev_t)); 69 int requested __P((char *[], struct acct *)); 70 void usage __P((void)); 71 char *user_from_uid(); 72 73 int 74 main(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 (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(*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 fldsiz(acct, ac_comm), fldsiz(acct, ac_comm), ab.ac_comm, 141 flagbits(ab.ac_flag), UT_NAMESIZE, UT_NAMESIZE, 142 user_from_uid(ab.ac_uid, 0), UT_LINESIZE, UT_LINESIZE, 143 getdev(ab.ac_tty), t / (double)AHZ, ctime(&ab.ac_btime)); 144 delta = expand(ab.ac_etime) / (double)AHZ; 145 printf(" (%1.0lf:%02.0lf:%05.2lf)\n", 146 delta / SECSPERHOUR, 147 fmod(delta, SECSPERHOUR) / SECSPERMIN, 148 fmod(delta, SECSPERMIN)); 149 } 150 /* are we at the beginning of the file yet? */ 151 if (size == 0) 152 break; 153 /* seek backward over the one we read and the next to read */ 154 if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1) 155 err(1, "%s", acctfile); 156 /* and account for its size */ 157 size -= sizeof(struct acct); 158 } 159 exit(0); 160 } 161 162 time_t 163 expand(t) 164 u_int t; 165 { 166 register time_t nt; 167 168 nt = t & 017777; 169 t >>= 13; 170 while (t) { 171 t--; 172 nt <<= 3; 173 } 174 return (nt); 175 } 176 177 char * 178 flagbits(f) 179 register 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 int 197 requested(argv, acp) 198 register char *argv[]; 199 register struct acct *acp; 200 { 201 do { 202 if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv)) 203 return (1); 204 if (!strcmp(getdev(acp->ac_tty), *argv)) 205 return (1); 206 if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm))) 207 return (1); 208 } while (*++argv); 209 return (0); 210 } 211 212 char * 213 getdev(dev) 214 dev_t dev; 215 { 216 static dev_t lastdev = (dev_t)-1; 217 static char *lastname; 218 219 if (dev == NODEV) /* Special case. */ 220 return ("__"); 221 if (dev == lastdev) /* One-element cache. */ 222 return (lastname); 223 lastdev = dev; 224 if ((lastname = devname(dev, S_IFCHR)) == NULL) 225 lastname = "??"; 226 return (lastname); 227 } 228 229 void 230 usage() 231 { 232 (void)fprintf(stderr, 233 "lastcomm [ -f file ] [command ...] [user ...] [tty ...]\n"); 234 exit(1); 235 } 236