/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Michael Fischbein. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1989, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93"; #endif /* not lint */ #include #include #include #include #include #include #ifdef __GNO__ #include #include #include #include #endif static void output(struct utmp *up); static FILE *file(char *name); int main(int argc, char **argv) { register char *p; static struct utmp usr; struct passwd *pw; #ifdef __GNO__ FILE *ufp; char *t; #else FILE *ufp, *file(); char *t, *rindex(), *strcpy(), *strncpy(), *ttyname(); #endif switch (argc) { case 1: /* who */ ufp = file(_PATH_UTMP); /* only entries with both name and line fields */ while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) if (*usr.ut_name && *usr.ut_line) output(&usr); break; case 2: /* who utmp_file */ ufp = file(argv[1]); /* all entries */ while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) output(&usr); break; case 3: /* who am i */ ufp = file(_PATH_UTMP); /* search through the utmp and find an entry for this tty */ if (p = ttyname(0)) { /* strip any directory component */ if (t = rindex(p, '/')) p = t + 1; while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) if (*usr.ut_name && !strcmp(usr.ut_line, p)) { output(&usr); exit(0); } /* well, at least we know what the tty is */ (void)strncpy(usr.ut_line, p, UT_LINESIZE); } else (void)strcpy(usr.ut_line, "tty??"); pw = getpwuid(getuid()); (void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE); (void)time(&usr.ut_time); *usr.ut_host = '\0'; output(&usr); break; default: (void)fprintf(stderr, "usage: who [ file ]\n who am i\n"); exit(1); } exit(0); } static void output(struct utmp *up) { static char buf[80]; (void)printf("%-*.*s %-*.*s", UT_NAMESIZE, UT_NAMESIZE, up->ut_name, UT_LINESIZE, UT_LINESIZE, up->ut_line); #ifdef __GNO__ sprintf(buf, "%s", asctime(localtime(&up->ut_time))); #else (void)strftime(buf, sizeof(buf), "%c", localtime(&up->ut_time)); #endif (void)printf("%.12s", buf + 4); if (*up->ut_host) printf("\t(%.*s)", UT_HOSTSIZE, up->ut_host); (void)putchar('\n'); } static FILE * file(char *name) { extern int errno; FILE *ufp; #ifndef __GNO__ char *strerror(); #endif if (!(ufp = fopen(name, "r"))) { (void)fprintf(stderr, "who: %s: %s.\n", name, strerror(errno)); exit(1); } return(ufp); }