diff --git a/usr.bin/who/Makefile b/usr.bin/who/Makefile new file mode 100644 index 0000000..8695ca2 --- /dev/null +++ b/usr.bin/who/Makefile @@ -0,0 +1,5 @@ +# @(#)Makefile 8.1 (Berkeley) 6/6/93 + +PROG= who + +.include diff --git a/usr.bin/who/who.1 b/usr.bin/who/who.1 new file mode 100644 index 0000000..14fca28 --- /dev/null +++ b/usr.bin/who/who.1 @@ -0,0 +1,104 @@ +.\" Copyright (c) 1986, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" 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. +.\" +.\" @(#)who.1 8.2 (Berkeley) 12/30/93 +.\" +.\" $Id: who.1,v 1.1 1997/10/26 17:12:24 gdr Exp $ +.\" +.TH WHO 1 "26 October 1997" GNO "Commands and Applications" +.SH NAME +.BR who +\- display who is logged in +.SH SYNOPSIS +.BR who +.RB [ am +.BR I ] +.RI [ file ] +.SH DESCRIPTION +The utility +.BR who +displays +a list of all users currently logged on, showing for each user +the login name, +tty name, the date and time of login, and hostname if not local. +.LP +Available options: +.RS +.IP "\fBam I\fR" +Returns the invoker's real user name. +.IP \fIfile\fR +By default, +.BR who +gathers information from the file +.BR /var/run/utmp . +An alternate +.BR file +may be specified which is usually +.BR /var/run/wtmp +(or +.BR /var/run/wtmp.[0-6] +depending on site policy as +.BR wtmp +can grow quite large and daily versions may or may not +be kept around after compression by +.BR ac (8)). +The +.BR wtmp +file contains a record of every login, logout, +crash, shutdown and date change +since +.BR wtmp +was last truncated or +created. +.RE +.LP +If +.BR /var/log/wtmp +is being used as the file, the user name may be empty +or one of the special characters '|', '}' and '~'. Logouts produce +an output line without any user name. For more information on the +special characters, see +.BR utmp (5). +.SH FILES +.B /var/run/utmp +.br +.B /var/log/wtmp +.br +.B /var/log/wtmp.[0-6] +.SH SEE ALSO +.BR last (1), +.BR users (1), +.BR getuid (2), +.BR utmp (5) +.SH HISTORY +A +.BR who +command appeared in Version 6 AT&T UNIX. diff --git a/usr.bin/who/who.c b/usr.bin/who/who.c new file mode 100644 index 0000000..77a131c --- /dev/null +++ b/usr.bin/who/who.c @@ -0,0 +1,135 @@ +/* + * 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 + +main(argc, argv) + int argc; + char **argv; +{ + register char *p; + struct utmp usr; + struct passwd *pw; + FILE *ufp, *file(); + char *t, *rindex(), *strcpy(), *strncpy(), *ttyname(); + + 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); +} + +output(up) + struct utmp *up; +{ + char buf[80]; + + (void)printf("%-*.*s %-*.*s", UT_NAMESIZE, UT_NAMESIZE, up->ut_name, + UT_LINESIZE, UT_LINESIZE, up->ut_line); + (void)strftime(buf, sizeof(buf), "%c", localtime(&up->ut_time)); + (void)printf("%.12s", buf + 4); + if (*up->ut_host) + printf("\t(%.*s)", UT_HOSTSIZE, up->ut_host); + (void)putchar('\n'); +} + +FILE * +file(name) + char *name; +{ + extern int errno; + FILE *ufp; + char *strerror(); + + if (!(ufp = fopen(name, "r"))) { + (void)fprintf(stderr, "who: %s: %s.\n", name, strerror(errno)); + exit(1); + } + return(ufp); +}