diff options
author | Eric Andersen <andersen@codepoet.org> | 2003-08-09 02:26:06 +0400 |
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committer | Eric Andersen <andersen@codepoet.org> | 2003-08-09 02:26:06 +0400 |
commit | 2e9c25700061b23982f8600288178c1f6a370c1e (patch) | |
tree | b9523c8010e85f5879a89e2a4b7e202d674e1e1c /miscutils/last.c | |
parent | f1c56a9306680874577abf01749c4b33877eb89a (diff) |
Implement a minimalist 'last' which allows the LEAF project to
no longer need dumtp. Remove the 'dumtp' applet.
-Erik
Diffstat (limited to 'miscutils/last.c')
-rw-r--r-- | miscutils/last.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/miscutils/last.c b/miscutils/last.c new file mode 100644 index 000000000..e7f9eb57a --- /dev/null +++ b/miscutils/last.c @@ -0,0 +1,107 @@ +/* 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); +} |