/* 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 ATTRIBUTE_UNUSED) { 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 = full_read(file, &ut, sizeof(ut))) > 0) { if (n != sizeof(ut)) { 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] == '\0' || strcmp(ut.ut_name, "LOGIN") == 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); }