Annotation of src/usr.bin/who/who.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1989, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * This code is derived from software contributed to Berkeley by
! 8: * Michael Fischbein.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed by the University of
! 21: * California, Berkeley and its contributors.
! 22: * 4. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: */
! 38:
! 39: #ifndef lint
! 40: static char copyright[] =
! 41: "@(#) Copyright (c) 1989, 1993\n\
! 42: The Regents of the University of California. All rights reserved.\n";
! 43: #endif /* not lint */
! 44:
! 45: #ifndef lint
! 46: #if 0
! 47: static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93";
! 48: #endif
! 49: static char rcsid[] = "$NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $";
! 50: #endif /* not lint */
! 51:
! 52: #include <sys/types.h>
! 53: #include <sys/stat.h>
! 54: #include <pwd.h>
! 55: #include <utmp.h>
! 56: #include <stdio.h>
! 57: #include <string.h>
! 58: #include <stdlib.h>
! 59: #include <unistd.h>
! 60: #include <time.h>
! 61: #include <err.h>
! 62:
! 63: void output __P((struct utmp *));
! 64: void who_am_i __P((FILE *));
! 65: void usage __P((void));
! 66: int only_current_term; /* show info about the current terminal only */
! 67: int show_term; /* show term state */
! 68: int show_idle; /* show idle time */
! 69:
! 70: int
! 71: main(argc, argv)
! 72: int argc;
! 73: char **argv;
! 74: {
! 75: struct utmp usr;
! 76: FILE *ufp, *file();
! 77: int c;
! 78:
! 79: while ((c = getopt(argc, argv, "mTu")) != -1) {
! 80: switch (c) {
! 81: case 'm':
! 82: only_current_term = 1;
! 83: break;
! 84: case 'T':
! 85: show_term = 1;
! 86: break;
! 87: case 'u':
! 88: show_idle = 1;
! 89: break;
! 90: default:
! 91: usage();
! 92: /* NOTREACHED */
! 93: }
! 94: }
! 95: argc -= optind;
! 96: argv += optind;
! 97:
! 98: if (chdir("/dev")) {
! 99: err(1, "cannot change directory to /dev");
! 100: /* NOTREACHED */
! 101: }
! 102:
! 103: switch (argc) {
! 104: case 0: /* who */
! 105: ufp = file(_PATH_UTMP);
! 106:
! 107: if (only_current_term) {
! 108: who_am_i(ufp);
! 109: } else {
! 110: /* only entries with both name and line fields */
! 111: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
! 112: if (*usr.ut_name && *usr.ut_line)
! 113: output(&usr);
! 114: }
! 115: break;
! 116: case 1: /* who utmp_file */
! 117: ufp = file(*argv);
! 118:
! 119: if (only_current_term) {
! 120: who_am_i(ufp);
! 121: } else {
! 122: /* all entries */
! 123: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
! 124: output(&usr);
! 125: }
! 126: break;
! 127: case 2: /* who am i */
! 128: ufp = file(_PATH_UTMP);
! 129: who_am_i(ufp);
! 130: break;
! 131: default:
! 132: usage();
! 133: /* NOTREACHED */
! 134: }
! 135: exit(0);
! 136: }
! 137:
! 138: void
! 139: who_am_i(ufp)
! 140: FILE *ufp;
! 141: {
! 142: struct utmp usr;
! 143: struct passwd *pw;
! 144: register char *p;
! 145: char *t;
! 146:
! 147: /* search through the utmp and find an entry for this tty */
! 148: if (p = ttyname(0)) {
! 149: /* strip any directory component */
! 150: if (t = rindex(p, '/'))
! 151: p = t + 1;
! 152: while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
! 153: if (usr.ut_name && !strcmp(usr.ut_line, p)) {
! 154: output(&usr);
! 155: return;
! 156: }
! 157: /* well, at least we know what the tty is */
! 158: (void)strncpy(usr.ut_line, p, UT_LINESIZE);
! 159: } else
! 160: (void)strcpy(usr.ut_line, "tty??");
! 161:
! 162: pw = getpwuid(getuid());
! 163: (void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE);
! 164: (void)time(&usr.ut_time);
! 165: *usr.ut_host = '\0';
! 166: output(&usr);
! 167: }
! 168:
! 169: void
! 170: output(up)
! 171: struct utmp *up;
! 172: {
! 173: struct stat sb;
! 174: char line[sizeof (up->ut_line) + 1];
! 175: char state;
! 176: static time_t now = 0;
! 177: time_t idle;
! 178:
! 179: if (show_term || show_idle) {
! 180: if (now == 0)
! 181: time(&now);
! 182:
! 183: strncpy (line, up->ut_line, sizeof (up->ut_line));
! 184: line[sizeof (up->ut_line)] = '\0';
! 185:
! 186: if (stat(line, &sb) == 0) {
! 187: state = (sb.st_mode & 020) ? '+' : '-';
! 188: idle = now - sb.st_atime;
! 189: } else {
! 190: state = '?';
! 191: idle = 0;
! 192: }
! 193:
! 194: }
! 195:
! 196: (void)printf("%-*.*s ", UT_NAMESIZE, UT_NAMESIZE, up->ut_name);
! 197:
! 198: if (show_term) {
! 199: (void)printf("%c ", state);
! 200: }
! 201:
! 202: (void)printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, up->ut_line);
! 203: (void)printf("%.12s ", ctime(&up->ut_time) + 4);
! 204:
! 205: if (show_idle) {
! 206: if (idle < 60)
! 207: (void)printf(" . ");
! 208: else if (idle < (24 * 60 * 60))
! 209: (void)printf("%02d:%02d ",
! 210: (idle / (60 * 60)),
! 211: (idle % (60 * 60)) / 60);
! 212: else
! 213: (void)printf(" old ");
! 214: }
! 215:
! 216: if (*up->ut_host)
! 217: printf("\t(%.*s)", UT_HOSTSIZE, up->ut_host);
! 218: (void)putchar('\n');
! 219: }
! 220:
! 221: FILE *
! 222: file(name)
! 223: char *name;
! 224: {
! 225: FILE *ufp;
! 226:
! 227: if (!(ufp = fopen(name, "r"))) {
! 228: err(1, "%s", name);
! 229: /* NOTREACHED */
! 230: }
! 231: return(ufp);
! 232: }
! 233:
! 234: void
! 235: usage()
! 236: {
! 237: (void)fprintf(stderr, "usage: who [-mTu] [ file ]\n who am i\n");
! 238: exit(1);
! 239: }
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