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authorEric Andersen <andersen@codepoet.org>2002-04-26 23:53:10 +0000
committerEric Andersen <andersen@codepoet.org>2002-04-26 23:53:10 +0000
commit00a6a750357d49d3e9cedf3edee7ae2aceae6748 (patch)
tree08c2ae0164e3fe70bb7f922b5c10f51449bd280b /coreutils/who.c
parent1c31501b1bacd5d3a2a156dfd6833fe174fff9d1 (diff)
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Add the who applet, supplied by Da Chen <dchen@ayrnetworks.com>
Diffstat (limited to 'coreutils/who.c')
-rw-r--r--coreutils/who.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/coreutils/who.c b/coreutils/who.c
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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 */
16
17#include <sys/types.h>
18#include <fcntl.h>
19#include <unistd.h>
20#include <stdlib.h>
21#include <utmp.h>
22#include <sys/stat.h>
23#include <errno.h>
24#include <string.h>
25#include <time.h>
26#include <busybox.h>
27
28extern int who_main(int argc, char **argv)
29{
30 struct utmp *ut;
31 struct stat st;
32 int devlen, len;
33 time_t now, idle;
34
35 if (argc > 1)
36 show_usage();
37
38 setutent();
39 devlen = sizeof("/dev/") - 1;
40 printf("USER TTY IDLE FROM HOST\n");
41
42 while ((ut = getutent()) != NULL) {
43 char name[40];
44
45 if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
46 len = strlen(ut->ut_line);
47 if (ut->ut_line[0] == '/') {
48 strncpy(name, ut->ut_line, len);
49 name[len] = '\0';
50 strcpy(ut->ut_line, ut->ut_line + devlen);
51 } else {
52 strcpy(name, "/dev/");
53 strncpy(name+devlen, ut->ut_line, len);
54 name[devlen+len] = '\0';
55 }
56
57 printf("%-10s %-8s ", ut->ut_user, ut->ut_line);
58
59 if (stat(name, &st) == 0) {
60 now = time(NULL);
61 idle = now - st.st_atime;
62
63 if (idle < 60)
64 printf("00:00m ");
65 else if (idle < (60 * 60))
66 printf("00:%02dm ", (int)(idle / 60));
67 else if (idle < (24 * 60 * 60))
68 printf("%02d:%02dm ", (int)(idle / (60 * 60)),
69 (int)(idle % (60 * 60)) / 60);
70 else if (idle < (24 * 60 * 60 * 365))
71 printf("%03ddays ", (int)(idle / (24 * 60 * 60)));
72 else
73 printf("%02dyears ", (int) (idle / (24 * 60 * 60 * 365)));
74 } else
75 printf("%-8s ", "?");
76
77 printf("%-12.12s %s\n", ctime(&(ut->ut_tv.tv_sec)) + 4, ut->ut_host);
78 }
79 }
80 endutent();
81
82 return 0;
83}
84
85