68 lines
1.7 KiB
C
68 lines
1.7 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 tarball for details.
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*
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*----------------------------------------------------------------------
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*/
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#include "busybox.h"
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#include <utmp.h>
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#include <time.h>
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static const char * idle_string (time_t t)
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{
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static char str[6];
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time_t s = time(NULL) - t;
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if (s < 60)
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return ".";
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if (s < (24 * 60 * 60)) {
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sprintf (str, "%02d:%02d",
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(int) (s / (60 * 60)),
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(int) ((s % (60 * 60)) / 60));
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return str;
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}
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return "old";
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}
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int who_main(int argc, char **argv)
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{
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struct utmp *ut;
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struct stat st;
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char *name;
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if (argc > 1) {
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bb_show_usage();
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}
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setutent();
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printf("USER TTY IDLE TIME HOST\n");
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while ((ut = getutent()) != NULL) {
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if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
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time_t thyme = ut->ut_tv.tv_sec;
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/* ut->ut_line is device name of tty - "/dev/" */
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name = concat_path_file("/dev", ut->ut_line);
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printf("%-10s %-8s %-8s %-12.12s %s\n", ut->ut_user, ut->ut_line,
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(stat(name, &st)) ? "?" : idle_string(st.st_atime),
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ctime(&thyme) + 4, ut->ut_host);
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if (ENABLE_FEATURE_CLEAN_UP) free(name);
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}
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}
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if (ENABLE_FEATURE_CLEAN_UP) endutent();
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return 0;
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}
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