LXR busybox/coreutils/who.c

   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.
   5 *
   6 * Author: Da Chen  <dchen@ayrnetworks.com>
   7 *
   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
  12 *
  13 * Copyright (c) 2002 AYR Networks, Inc.
  14 *
  15 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  16 *
  17 *----------------------------------------------------------------------
  18 */
  19/* BB_AUDIT SUSv3 _NOT_ compliant -- missing options -b, -d, -H, -l, -m, -p, -q, -r, -s, -t, -T, -u; Missing argument 'file'.  */
  20
  21#include "libbb.h"
  22#include <utmp.h>
  23
  24static void idle_string(char *str6, time_t t)
  25{
  26        t = time(NULL) - t;
  27
  28        /*if (t < 60) {
  29                str6[0] = '.';
  30                str6[1] = '\0';
  31                return;
  32        }*/
  33        if (t >= 0 && t < (24 * 60 * 60)) {
  34                sprintf(str6, "%02d:%02d",
  35                                (int) (t / (60 * 60)),
  36                                (int) ((t % (60 * 60)) / 60));
  37                return;
  38        }
  39        strcpy(str6, "old");
  40}
  41
  42int who_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  43int who_main(int argc UNUSED_PARAM, char **argv)
  44{
  45        char str6[6];
  46        struct utmp *ut;
  47        struct stat st;
  48        char *name;
  49        unsigned opt;
  50
  51        opt_complementary = "=0";
  52        opt = getopt32(argv, "a");
  53
  54        setutent();
  55        printf("USER       TTY      IDLE      TIME            HOST\n");
  56        while ((ut = getutent()) != NULL) {
  57                if (ut->ut_user[0] && (opt || ut->ut_type == USER_PROCESS)) {
  58                        time_t tmp;
  59                        /* ut->ut_line is device name of tty - "/dev/" */
  60                        name = concat_path_file("/dev", ut->ut_line);
  61                        str6[0] = '?';
  62                        str6[1] = '\0';
  63                        if (stat(name, &st) == 0)
  64                                idle_string(str6, st.st_atime);
  65                        /* manpages say ut_tv.tv_sec *is* time_t,
  66                         * but some systems have it wrong */
  67                        tmp = ut->ut_tv.tv_sec;
  68                        /* 15 chars for time:   Nov 10 19:33:20 */
  69                        printf("%-10s %-8s %-9s %-15.15s %s\n",
  70                                        ut->ut_user, ut->ut_line, str6,
  71                                        ctime(&tmp) + 4, ut->ut_host);
  72                        if (ENABLE_FEATURE_CLEAN_UP)
  73                                free(name);
  74                }
  75        }
  76        if (ENABLE_FEATURE_CLEAN_UP)
  77                endutent();
  78        return EXIT_SUCCESS;
  79}
  80