Implement a minimalist 'last' which allows the LEAF project to

no longer need dumtp.  Remove the 'dumtp' applet.
 -Erik

1 files changed, 107 insertions, 0 deletions

diff --git a/miscutils/last.c b/miscutils/last.c
new file mode 100644
index 0000000..e7f9eb5
--- /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);
+}