1 /* vi: set sw=4 ts=4: */
2 /*----------------------------------------------------------------------
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.
17 *----------------------------------------------------------------------
22 //config: depends on FEATURE_UTMP
24 //config: who is used to show who is logged on.
26 // procps-ng has this variation of "who":
30 //config: depends on FEATURE_UTMP
32 //config: w is used to show who is logged on.
35 //config: bool "users"
37 //config: depends on FEATURE_UTMP
39 //config: Print users currently logged on.
41 // APPLET_ODDNAME:name main location suid_type help
42 //applet:IF_USERS(APPLET_ODDNAME(users, who, BB_DIR_USR_BIN, BB_SUID_DROP, users))
43 //applet:IF_USERS(APPLET_ODDNAME(w, who, BB_DIR_USR_BIN, BB_SUID_DROP, w))
44 //applet:IF_WHO( APPLET( who, BB_DIR_USR_BIN, BB_SUID_DROP))
46 //kbuild:lib-$(CONFIG_USERS) += who.o
47 //kbuild:lib-$(CONFIG_WHO) += who.o
49 /* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'. */
51 //usage:#define users_trivial_usage
53 //usage:#define users_full_usage "\n\n"
54 //usage: "Print the users currently logged on"
56 //usage:#define w_trivial_usage
58 //usage:#define w_full_usage "\n\n"
59 //usage: "Show who is logged on"
62 // "\n -h, --no-header"
63 // "\n -u, --no-current"
64 // Ignores the username while figuring out the current process
65 // and cpu times. To demonstrate this, do a "su" and do a "w" and a "w -u".
67 // Short format. Don't print the login time, JCPU or PCPU times.
69 // Toggle printing the from (remote hostname) field.
70 // The default is for the from field to not be printed
72 // Display IP address instead of hostname for from field.
73 // "\n -o, --old-style"
74 // Old style output. Prints blank space for idle times less than one minute.
76 // 17:28:00 up 4 days, 22:41, 4 users, load average: 0.84, 0.97, 0.90
77 // USER TTY LOGIN@ IDLE JCPU PCPU WHAT
78 // root tty1 Thu18 4days 4:33m 0.07s /bin/sh /etc/xdg/xfce4/xinitrc -- vt
79 // root pts/1 Mon13 3:24m 1:01 0.01s w
81 //usage:#define who_trivial_usage
83 //usage:#define who_full_usage "\n\n"
84 //usage: "Show who is logged on\n"
85 //usage: "\n -a Show all"
86 //usage: "\n -H Print column headers"
90 static void idle_string(char *str6, time_t t)
99 if (t >= 0 && t < (24 * 60 * 60)) {
100 sprintf(str6, "%02d:%02d",
101 (int) (t / (60 * 60)),
102 (int) ((t % (60 * 60)) / 60));
108 int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
109 int who_main(int argc UNUSED_PARAM, char **argv)
111 #define CNT_APPLET (ENABLE_USERS + ENABLE_W + ENABLE_WHO)
112 int do_users = (ENABLE_USERS && (CNT_APPLET == 1 || applet_name[0] == 'u'));
113 int do_w = (ENABLE_W && (CNT_APPLET == 1 || applet_name[1] == '\0'));
114 int do_who = (ENABLE_WHO && (CNT_APPLET == 1 || applet_name[1] == 'h'));
117 const char *fmt = "%s";
119 opt_complementary = "=0";
120 opt = getopt32(argv, do_who ? "aH" : "");
121 if ((opt & 2) || do_w) /* -H or we are w */
122 puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST");
125 while ((ut = getutxent()) != NULL) {
127 && ((opt & 1) || ut->ut_type == USER_PROCESS)
131 char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
137 strcpy(name, "/dev/");
138 safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
140 sizeof(ut->ut_line)+1
142 if (stat(name, &st) == 0)
143 idle_string(str6, st.st_atime);
144 /* manpages say ut_tv.tv_sec *is* time_t,
145 * but some systems have it wrong */
146 seconds = ut->ut_tv.tv_sec;
147 /* How wide time field can be?
148 * "Nov 10 19:33:20": 15 chars
149 * "2010-11-10 19:33": 16 chars
151 printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n",
152 (int)sizeof(ut->ut_user), ut->ut_user,
153 (int)sizeof(ut->ut_line), ut->ut_line,
155 // TODO: with LANG=en_US.UTF-8, who from coreutils 8.25 shows
156 // TIME col as "2017-04-06 18:47" (the default format is "Apr 6 18:47").
157 // The former format looks saner to me. Switch to it unconditionally?
159 (int)sizeof(ut->ut_host), ut->ut_host
162 printf(fmt, ut->ut_user);
169 if (ENABLE_FEATURE_CLEAN_UP)