171 lines
5.2 KiB
C
171 lines
5.2 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini who is used to display user name, login time,
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* idle time and host name.
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*
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* Author: Da Chen <dchen@ayrnetworks.com>
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*
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* This is a free document; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation:
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* http://www.gnu.org/copyleft/gpl.html
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*
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* Copyright (c) 2002 AYR Networks, Inc.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config WHO
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//config: bool "who (3.7 kb)"
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//config: default y
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//config: depends on FEATURE_UTMP
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//config: help
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//config: Print users currently logged on.
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//config:
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// procps-ng has this variation of "who":
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//config:config W
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//config: bool "w (3.7 kb)"
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//config: default y
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//config: depends on FEATURE_UTMP
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//config: help
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//config: Print users currently logged on.
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//config:
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//config:config USERS
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//config: bool "users (3.2 kb)"
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//config: default y
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//config: depends on FEATURE_UTMP
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//config: help
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//config: Print users currently logged on.
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// APPLET_NOEXEC:name main location suid_type help
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//applet:IF_USERS(APPLET_NOEXEC(users, who, BB_DIR_USR_BIN, BB_SUID_DROP, users))
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//applet:IF_W( APPLET_NOEXEC(w, who, BB_DIR_USR_BIN, BB_SUID_DROP, w))
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//applet:IF_WHO( APPLET_NOEXEC(who, who, BB_DIR_USR_BIN, BB_SUID_DROP, who))
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//kbuild:lib-$(CONFIG_USERS) += who.o
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//kbuild:lib-$(CONFIG_W) += who.o
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//kbuild:lib-$(CONFIG_WHO) += who.o
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/* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'. */
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//usage:#define users_trivial_usage
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//usage: ""
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//usage:#define users_full_usage "\n\n"
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//usage: "Print the users currently logged on"
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//usage:#define w_trivial_usage
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//usage: ""
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//usage:#define w_full_usage "\n\n"
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//usage: "Show who is logged on"
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//
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// procps-ng 3.3.10:
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// "\n -h, --no-header"
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// "\n -u, --no-current"
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// Ignores the username while figuring out the current process
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// and cpu times. To demonstrate this, do a "su" and do a "w" and a "w -u".
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// "\n -s, --short"
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// Short format. Don't print the login time, JCPU or PCPU times.
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// "\n -f, --from"
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// Toggle printing the from (remote hostname) field.
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// The default is for the from field to not be printed
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// "\n -i, --ip-addr"
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// Display IP address instead of hostname for from field.
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// "\n -o, --old-style"
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// Old style output. Prints blank space for idle times less than one minute.
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// Example output:
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// 17:28:00 up 4 days, 22:41, 4 users, load average: 0.84, 0.97, 0.90
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// USER TTY LOGIN@ IDLE JCPU PCPU WHAT
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// root tty1 Thu18 4days 4:33m 0.07s /bin/sh /etc/xdg/xfce4/xinitrc -- vt
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// root pts/1 Mon13 3:24m 1:01 0.01s w
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//usage:#define who_trivial_usage
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//usage: "[-a]"
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//usage:#define who_full_usage "\n\n"
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//usage: "Show who is logged on\n"
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//usage: "\n -a Show all"
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//usage: "\n -H Print column headers"
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#include "libbb.h"
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static void idle_string(char *str6, time_t t)
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{
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t = time(NULL) - t;
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/*if (t < 60) {
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str6[0] = '.';
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str6[1] = '\0';
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return;
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}*/
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if (t >= 0 && t < (24 * 60 * 60)) {
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sprintf(str6, "%02d:%02d",
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(int) (t / (60 * 60)),
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(int) ((t % (60 * 60)) / 60));
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return;
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}
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strcpy(str6, "old");
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}
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int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int who_main(int argc UNUSED_PARAM, char **argv)
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{
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#define CNT_APPLET (ENABLE_USERS + ENABLE_W + ENABLE_WHO)
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int do_users = (ENABLE_USERS && (CNT_APPLET == 1 || applet_name[0] == 'u'));
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int do_w = (ENABLE_W && (CNT_APPLET == 1 || applet_name[1] == '\0'));
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int do_who = (ENABLE_WHO && (CNT_APPLET == 1 || applet_name[1] == 'h'));
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struct utmpx *ut;
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unsigned opt;
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const char *fmt = "%s";
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opt = getopt32(argv, do_who ? "^" "aH" "\0" "=0": "^" "" "\0" "=0");
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if ((opt & 2) || do_w) /* -H or we are w */
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puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST");
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setutxent();
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while ((ut = getutxent()) != NULL) {
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if (ut->ut_user[0]
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&& ((opt & 1) || ut->ut_type == USER_PROCESS)
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) {
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if (!do_users) {
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char str6[6];
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char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
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struct stat st;
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time_t seconds;
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str6[0] = '?';
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str6[1] = '\0';
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strcpy(name, "/dev/");
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safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
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ut->ut_line,
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sizeof(ut->ut_line)+1
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);
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if (stat(name, &st) == 0)
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idle_string(str6, st.st_atime);
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/* manpages say ut_tv.tv_sec *is* time_t,
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* but some systems have it wrong */
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seconds = ut->ut_tv.tv_sec;
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/* How wide time field can be?
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* "Nov 10 19:33:20": 15 chars
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* "2010-11-10 19:33": 16 chars
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*/
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printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n",
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(int)sizeof(ut->ut_user), ut->ut_user,
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(int)sizeof(ut->ut_line), ut->ut_line,
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str6,
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// TODO: with LANG=en_US.UTF-8, who from coreutils 8.25 shows
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// TIME col as "2017-04-06 18:47" (the default format is "Apr 6 18:47").
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// The former format looks saner to me. Switch to it unconditionally?
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ctime(&seconds) + 4,
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(int)sizeof(ut->ut_host), ut->ut_host
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);
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} else {
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printf(fmt, ut->ut_user);
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fmt = " %s";
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}
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}
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}
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if (do_users)
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bb_putchar('\n');
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if (ENABLE_FEATURE_CLEAN_UP)
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endutxent();
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return EXIT_SUCCESS;
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}
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