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Implement a minimalist 'last' which allows the LEAF project to

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no longer need dumtp.  Remove the 'dumtp' applet.
 -Erik
This commit is contained in:
Eric Andersen
2003-08-08 22:26:06 +00:00
parent f1c56a9306
commit 2e9c257000
6 changed files with 120 additions and 93 deletions
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miscutils/last.c Normal file
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/* vi: set sw=4 ts=4: */
/*
* last implementation for busybox
*
* Copyright (C) 2003 Erik Andersen <andersen@codepoet.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <utmp.h>
#include <sys/stat.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include "busybox.h"
#ifndef SHUTDOWN_TIME
# define SHUTDOWN_TIME 254
#endif
/* Grr... utmp char[] members do not have to be nul-terminated.
* Do what we can while still keeping this reasonably small.
* Note: We are assuming the ut_id[] size is fixed at 4. */
#if (UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)
#error struct utmp member char[] size(s) have changed!
#endif
extern int last_main(int argc, char **argv)
{
struct utmp ut;
int n, file = STDIN_FILENO;
if (argc > 1) {
bb_show_usage();
}
file = bb_xopen(_PATH_WTMP, O_RDONLY);
printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
if (n != sizeof(struct utmp)) {
bb_perror_msg_and_die("short read");
}
if (strncmp(ut.ut_line, "~", 1) == 0) {
if (strncmp(ut.ut_user, "shutdown", 8) == 0)
ut.ut_type = SHUTDOWN_TIME;
else if (strncmp(ut.ut_user, "reboot", 6) == 0)
ut.ut_type = BOOT_TIME;
else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
ut.ut_type = RUN_LVL;
} else {
if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 ||
ut.ut_name[0] == 0)
{
/* Don't bother. This means we can't find how long
* someone was logged in for. Oh well. */
continue;
}
if (ut.ut_type != DEAD_PROCESS &&
ut.ut_name[0] && ut.ut_line[0])
{
ut.ut_type = USER_PROCESS;
}
if (strcmp(ut.ut_name, "date") == 0) {
if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
}
}
if (ut.ut_type!=USER_PROCESS) {
switch (ut.ut_type) {
case OLD_TIME:
case NEW_TIME:
case RUN_LVL:
case SHUTDOWN_TIME:
continue;
case BOOT_TIME:
strcpy(ut.ut_line, "system boot");
break;
}
}
printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
ctime(&(ut.ut_tv.tv_sec)) + 4);
}
bb_fflush_stdout_and_exit(EXIT_SUCCESS);
}