busybox/coreutils/who.c

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/* vi: set sw=4 ts=4: */
/*
* Mini who is used to display user name, login time,
* idle time and host name.
*
* Author: Da Chen <dchen@ayrnetworks.com>
*
* This is a free document; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation:
* http://www.gnu.org/copyleft/gpl.html
*
* Copyright (c) 2002 AYR Networks, Inc.
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config WHO
//config: bool "who (3.7 kb)"
//config: default y
//config: depends on FEATURE_UTMP
//config: help
//config: Print users currently logged on.
//config:
// procps-ng has this variation of "who":
//config:config W
//config: bool "w (3.7 kb)"
//config: default y
//config: depends on FEATURE_UTMP
//config: help
//config: Print users currently logged on.
//config:
//config:config USERS
//config: bool "users (3.2 kb)"
//config: default y
//config: depends on FEATURE_UTMP
//config: help
//config: Print users currently logged on.
// APPLET_NOEXEC:name main location suid_type help
//applet:IF_USERS(APPLET_NOEXEC(users, who, BB_DIR_USR_BIN, BB_SUID_DROP, users))
//applet:IF_W( APPLET_NOEXEC(w, who, BB_DIR_USR_BIN, BB_SUID_DROP, w))
//applet:IF_WHO( APPLET_NOEXEC(who, who, BB_DIR_USR_BIN, BB_SUID_DROP, who))
//kbuild:lib-$(CONFIG_USERS) += who.o
//kbuild:lib-$(CONFIG_W) += who.o
//kbuild:lib-$(CONFIG_WHO) += who.o
/* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'. */
//usage:#define users_trivial_usage
//usage: ""
//usage:#define users_full_usage "\n\n"
//usage: "Print the users currently logged on"
//usage:#define w_trivial_usage
//usage: ""
//usage:#define w_full_usage "\n\n"
//usage: "Show who is logged on"
//
// procps-ng 3.3.10:
// "\n -h, --no-header"
// "\n -u, --no-current"
// Ignores the username while figuring out the current process
// and cpu times. To demonstrate this, do a "su" and do a "w" and a "w -u".
// "\n -s, --short"
// Short format. Don't print the login time, JCPU or PCPU times.
// "\n -f, --from"
// Toggle printing the from (remote hostname) field.
// The default is for the from field to not be printed
// "\n -i, --ip-addr"
// Display IP address instead of hostname for from field.
// "\n -o, --old-style"
// Old style output. Prints blank space for idle times less than one minute.
// Example output:
// 17:28:00 up 4 days, 22:41, 4 users, load average: 0.84, 0.97, 0.90
// USER TTY LOGIN@ IDLE JCPU PCPU WHAT
// root tty1 Thu18 4days 4:33m 0.07s /bin/sh /etc/xdg/xfce4/xinitrc -- vt
// root pts/1 Mon13 3:24m 1:01 0.01s w
//usage:#define who_trivial_usage
//usage: "[-a]"
//usage:#define who_full_usage "\n\n"
//usage: "Show who is logged on\n"
//usage: "\n -a Show all"
//usage: "\n -H Print column headers"
#include "libbb.h"
static void idle_string(char *str6, time_t t)
{
t = time(NULL) - t;
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/*if (t < 60) {
str6[0] = '.';
str6[1] = '\0';
return;
}*/
if (t >= 0 && t < (24 * 60 * 60)) {
sprintf(str6, "%02d:%02d",
(int) (t / (60 * 60)),
(int) ((t % (60 * 60)) / 60));
return;
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}
strcpy(str6, "old");
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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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{
#define CNT_APPLET (ENABLE_USERS + ENABLE_W + ENABLE_WHO)
int do_users = (ENABLE_USERS && (CNT_APPLET == 1 || applet_name[0] == 'u'));
int do_w = (ENABLE_W && (CNT_APPLET == 1 || applet_name[1] == '\0'));
int do_who = (ENABLE_WHO && (CNT_APPLET == 1 || applet_name[1] == 'h'));
struct utmpx *ut;
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unsigned opt;
const char *fmt = "%s";
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getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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opt = getopt32(argv, do_who ? "^" "aH" "\0" "=0": "^" "" "\0" "=0");
if ((opt & 2) || do_w) /* -H or we are w */
puts("USER\t\tTTY\t\tIDLE\tTIME\t\t HOST");
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setutxent();
while ((ut = getutxent()) != NULL) {
if (ut->ut_user[0]
&& ((opt & 1) || ut->ut_type == USER_PROCESS)
) {
if (!do_users) {
char str6[6];
char name[sizeof("/dev/") + sizeof(ut->ut_line) + 1];
struct stat st;
time_t seconds;
str6[0] = '?';
str6[1] = '\0';
strcpy(name, "/dev/");
safe_strncpy(ut->ut_line[0] == '/' ? name : name + sizeof("/dev/")-1,
ut->ut_line,
sizeof(ut->ut_line)+1
);
if (stat(name, &st) == 0)
idle_string(str6, st.st_atime);
/* manpages say ut_tv.tv_sec *is* time_t,
* but some systems have it wrong */
seconds = ut->ut_tv.tv_sec;
/* How wide time field can be?
* "Nov 10 19:33:20": 15 chars
* "2010-11-10 19:33": 16 chars
*/
printf("%-15.*s %-15.*s %-7s %-16.16s %.*s\n",
(int)sizeof(ut->ut_user), ut->ut_user,
(int)sizeof(ut->ut_line), ut->ut_line,
str6,
// TODO: with LANG=en_US.UTF-8, who from coreutils 8.25 shows
// TIME col as "2017-04-06 18:47" (the default format is "Apr 6 18:47").
// The former format looks saner to me. Switch to it unconditionally?
ctime(&seconds) + 4,
(int)sizeof(ut->ut_host), ut->ut_host
);
} else {
printf(fmt, ut->ut_user);
fmt = " %s";
}
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}
}
if (do_users)
bb_putchar('\n');
if (ENABLE_FEATURE_CLEAN_UP)
endutxent();
return EXIT_SUCCESS;
}