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96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* last implementation for busybox
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*
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* Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org>
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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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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#ifndef SHUTDOWN_TIME
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# define SHUTDOWN_TIME 254
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#endif
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/* Grr... utmp char[] members do not have to be nul-terminated.
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* Do what we can while still keeping this reasonably small.
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* Note: We are assuming the ut_id[] size is fixed at 4. */
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#if (UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256)
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#error struct utmp member char[] size(s) have changed!
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#endif
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int last_main(int argc, char **argv)
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{
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struct utmp ut;
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int n, file = STDIN_FILENO;
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time_t t_tmp;
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if (argc > 1) {
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bb_show_usage();
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}
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file = bb_xopen(_PATH_WTMP, O_RDONLY);
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printf("%-10s %-14s %-18s %-12.12s %s\n", "USER", "TTY", "HOST", "LOGIN", "TIME");
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while ((n = safe_read(file, (void*)&ut, sizeof(struct utmp))) != 0) {
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if (n != sizeof(struct utmp)) {
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bb_perror_msg_and_die("short read");
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}
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if (strncmp(ut.ut_line, "~", 1) == 0) {
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if (strncmp(ut.ut_user, "shutdown", 8) == 0)
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ut.ut_type = SHUTDOWN_TIME;
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else if (strncmp(ut.ut_user, "reboot", 6) == 0)
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ut.ut_type = BOOT_TIME;
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else if (strncmp(ut.ut_user, "runlevel", 7) == 0)
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ut.ut_type = RUN_LVL;
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} else {
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if (!ut.ut_name[0] || strcmp(ut.ut_name, "LOGIN") == 0 ||
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ut.ut_name[0] == 0)
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{
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/* Don't bother. This means we can't find how long
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* someone was logged in for. Oh well. */
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continue;
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}
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if (ut.ut_type != DEAD_PROCESS &&
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ut.ut_name[0] && ut.ut_line[0])
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{
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ut.ut_type = USER_PROCESS;
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}
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if (strcmp(ut.ut_name, "date") == 0) {
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if (ut.ut_line[0] == '|') ut.ut_type = OLD_TIME;
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if (ut.ut_line[0] == '{') ut.ut_type = NEW_TIME;
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}
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}
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if (ut.ut_type!=USER_PROCESS) {
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switch (ut.ut_type) {
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case OLD_TIME:
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case NEW_TIME:
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case RUN_LVL:
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case SHUTDOWN_TIME:
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continue;
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case BOOT_TIME:
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strcpy(ut.ut_line, "system boot");
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break;
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}
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}
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t_tmp = (time_t)ut.ut_tv.tv_sec;
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printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
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ctime(&t_tmp) + 4);
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}
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bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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