1 /* vi: set sw=4 ts=4: */
3 * Mini who is used to display user name, login time,
4 * idle time and host name.
6 * Author: Da Chen <dchen@ayrnetworks.com>
8 * This is a free document; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation:
11 * http://www.gnu.org/copyleft/gpl.html
13 * Copyright (c) 2002 AYR Networks, Inc.
15 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
18 //config: bool "who (3.7 kb)"
20 //config: depends on FEATURE_UTMP
22 //config: Print users currently logged on.
24 // procps-ng has this variation of "who":
26 //config: bool "w (3.7 kb)"
28 //config: depends on FEATURE_UTMP
30 //config: Print users currently logged on.
33 //config: bool "users (3.2 kb)"
35 //config: depends on FEATURE_UTMP
37 //config: Print users currently logged on.
39 // APPLET_NOEXEC:name main location suid_type help
40 //applet:IF_USERS(APPLET_NOEXEC(users, who, BB_DIR_USR_BIN, BB_SUID_DROP, users))
41 //applet:IF_W( APPLET_NOEXEC(w, who, BB_DIR_USR_BIN, BB_SUID_DROP, w))
42 //applet:IF_WHO( APPLET_NOEXEC(who, who, BB_DIR_USR_BIN, BB_SUID_DROP, who))
44 //kbuild:lib-$(CONFIG_USERS) += who.o
45 //kbuild:lib-$(CONFIG_W) += who.o
46 //kbuild:lib-$(CONFIG_WHO) += who.o
48 /* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'. */
50 //usage:#define users_trivial_usage
52 //usage:#define users_full_usage "\n\n"
53 //usage: "Print the users currently logged on"
55 //usage:#define w_trivial_usage
57 //usage:#define w_full_usage "\n\n"
58 //usage: "Show who is logged on"
61 // "\n -h, --no-header"
62 // "\n -u, --no-current"
63 // Ignores the username while figuring out the current process
64 // and cpu times. To demonstrate this, do a "su" and do a "w" and a "w -u".
66 // Short format. Don't print the login time, JCPU or PCPU times.
68 // Toggle printing the from (remote hostname) field.
69 // The default is for the from field to not be printed
71 // Display IP address instead of hostname for from field.
72 // "\n -o, --old-style"
73 // Old style output. Prints blank space for idle times less than one minute.
75 // 17:28:00 up 4 days, 22:41, 4 users, load average: 0.84, 0.97, 0.90
76 // USER TTY LOGIN@ IDLE JCPU PCPU WHAT
77 // root tty1 Thu18 4days 4:33m 0.07s /bin/sh /etc/xdg/xfce4/xinitrc -- vt
78 // root pts/1 Mon13 3:24m 1:01 0.01s w
80 //usage:#define who_trivial_usage
82 //usage:#define who_full_usage "\n\n"
83 //usage: "Show who is logged on\n"
84 //usage: "\n -a Show all"
85 //usage: "\n -H Print column headers"
89 static void idle_string(char *str6, time_t t)
98 if (t >= 0 && t < (24 * 60 * 60)) {
99 sprintf(str6, "%02d:%02d",
100 (int) (t / (60 * 60)),
101 (int) ((t % (60 * 60)) / 60));
107 int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
108 int who_main(int argc UNUSED_PARAM, char **argv)
110 #define CNT_APPLET (ENABLE_USERS + ENABLE_W + ENABLE_WHO)
111 int do_users = (ENABLE_USERS && (CNT_APPLET == 1 || applet_name[0] == 'u'));
112 int do_w = (ENABLE_W && (CNT_APPLET == 1 || applet_name[1] == '\0'));
113 int do_who = (ENABLE_WHO && (CNT_APPLET == 1 || applet_name[1] == 'h'));
116 const char *fmt = "%s";
118 opt = getopt32(argv, do_who ? "^" "aH" "\0" "=0": "^" "" "\0" "=0");
119 if ((opt & 2) || do_w) /* -H or we are w */
120 puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST");
123 while ((ut = getutxent()) != NULL) {
125 && ((opt & 1) || ut->ut_type == USER_PROCESS)
129 char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
135 strcpy(name, "/dev/");
136 safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
138 sizeof(ut->ut_line)+1
140 if (stat(name, &st) == 0)
141 idle_string(str6, st.st_atime);
142 /* manpages say ut_tv.tv_sec *is* time_t,
143 * but some systems have it wrong */
144 seconds = ut->ut_tv.tv_sec;
145 /* How wide time field can be?
146 * "Nov 10 19:33:20": 15 chars
147 * "2010-11-10 19:33": 16 chars
149 printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n",
150 (int)sizeof(ut->ut_user), ut->ut_user,
151 (int)sizeof(ut->ut_line), ut->ut_line,
153 // TODO: with LANG=en_US.UTF-8, who from coreutils 8.25 shows
154 // TIME col as "2017-04-06 18:47" (the default format is "Apr 6 18:47").
155 // The former format looks saner to me. Switch to it unconditionally?
157 (int)sizeof(ut->ut_host), ut->ut_host
160 printf(fmt, ut->ut_user);
167 if (ENABLE_FEATURE_CLEAN_UP)