86 lines
2.5 KiB
C
86 lines
2.5 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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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <utmp.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <string.h>
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#include <time.h>
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#include <busybox.h>
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extern 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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int devlen, len;
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time_t now, idle;
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if (argc > 1)
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show_usage();
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setutent();
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devlen = sizeof("/dev/") - 1;
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printf("USER TTY IDLE FROM HOST\n");
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while ((ut = getutent()) != NULL) {
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char name[40];
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if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
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len = strlen(ut->ut_line);
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if (ut->ut_line[0] == '/') {
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strncpy(name, ut->ut_line, len);
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name[len] = '\0';
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strcpy(ut->ut_line, ut->ut_line + devlen);
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} else {
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strcpy(name, "/dev/");
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strncpy(name+devlen, ut->ut_line, len);
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name[devlen+len] = '\0';
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}
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printf("%-10s %-8s ", ut->ut_user, ut->ut_line);
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if (stat(name, &st) == 0) {
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now = time(NULL);
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idle = now - st.st_atime;
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if (idle < 60)
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printf("00:00m ");
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else if (idle < (60 * 60))
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printf("00:%02dm ", (int)(idle / 60));
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else if (idle < (24 * 60 * 60))
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printf("%02d:%02dm ", (int)(idle / (60 * 60)),
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(int)(idle % (60 * 60)) / 60);
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else if (idle < (24 * 60 * 60 * 365))
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printf("%03ddays ", (int)(idle / (24 * 60 * 60)));
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else
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printf("%02dyears ", (int) (idle / (24 * 60 * 60 * 365)));
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} else
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printf("%-8s ", "?");
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printf("%-12.12s %s\n", ctime(&(ut->ut_tv.tv_sec)) + 4, ut->ut_host);
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}
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}
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endutent();
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return 0;
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}
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