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- /* vi: set sw=4 ts=4: */
- /*
- * last implementation for busybox
- *
- * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org>
- *
- * Licensed under the GPL version 2, see the file LICENSE in this tarball.
- */
- #include "libbb.h"
- #include <utmp.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 defined UT_LINESIZE \
- && ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256))
- #error struct utmp member char[] size(s) have changed!
- #elif defined __UT_LINESIZE \
- && ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256))
- #error struct utmp member char[] size(s) have changed!
- #endif
- int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
- int last_main(int argc, char **argv)
- {
- struct utmp ut;
- int n, file = STDIN_FILENO;
- time_t t_tmp;
- if (argc > 1) {
- bb_show_usage();
- }
- file = xopen(bb_path_wtmp_file, 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 (ut.ut_line[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;
- }
- }
- t_tmp = (time_t)ut.ut_tv.tv_sec;
- printf("%-10s %-14s %-18s %-12.12s\n", ut.ut_user, ut.ut_line, ut.ut_host,
- ctime(&t_tmp) + 4);
- }
- fflush_stdout_and_exit(EXIT_SUCCESS);
- }
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