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authorGravatar Eric Andersen <andersen@codepoet.org>2003-08-08 22:26:06 +0000
committerGravatar Eric Andersen <andersen@codepoet.org>2003-08-08 22:26:06 +0000
commit2e9c25700061b23982f8600288178c1f6a370c1e (patch)
treeb9523c8010e85f5879a89e2a4b7e202d674e1e1c /miscutils/last.c
parentf1c56a9306680874577abf01749c4b33877eb89a (diff)
downloadbusybox-2e9c25700061b23982f8600288178c1f6a370c1e.tar.gz
busybox-2e9c25700061b23982f8600288178c1f6a370c1e.tar.bz2
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.c107
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);
+}