1 files changed, 67 insertions, 0 deletions
diff --git a/coreutils/who.c b/coreutils/who.c
new file mode 100644
index 000000000..4cd42652b
--- /dev/null
+++ b/coreutils/who.c
@@ -0,0 +1,67 @@
+/* vi: set sw=4 ts=4: */
+/*----------------------------------------------------------------------
+ * Mini who is used to display user name, login time,
+ * idle time and host name.
+ *
+ * Author: Da Chen  <dchen@ayrnetworks.com>
+ *
+ * This is a free document; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation:
+ *    http://www.gnu.org/copyleft/gpl.html
+ *
+ * Copyright (c) 2002 AYR Networks, Inc.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ *
+ *----------------------------------------------------------------------
+ */
+
+#include "busybox.h"
+#include <utmp.h>
+#include <time.h>
+
+static const char * idle_string (time_t t)
+{
+	static char str[6];
+
+	time_t s = time(NULL) - t;
+
+	if (s < 60)
+		return ".";
+	if (s < (24 * 60 * 60)) {
+		sprintf(str, "%02d:%02d",
+				(int) (s / (60 * 60)),
+				(int) ((s % (60 * 60)) / 60));
+		return str;
+	}
+	return "old";
+}
+
+int who_main(int argc, char **argv)
+{
+	struct utmp *ut;
+	struct stat st;
+	char *name;
+
+	if (argc > 1) {
+		bb_show_usage();
+	}
+
+	setutent();
+	printf("USER       TTY      IDLE      TIME           HOST\n");
+	while ((ut = getutent()) != NULL) {
+		if (ut->ut_user[0] && ut->ut_type == USER_PROCESS) {
+			time_t thyme = ut->ut_tv.tv_sec;
+
+			/* ut->ut_line is device name of tty - "/dev/" */
+			name = concat_path_file("/dev", ut->ut_line);
+			printf("%-10s %-8s %-8s  %-12.12s   %s\n", ut->ut_user, ut->ut_line,
+									(stat(name, &st)) ?  "?" : idle_string(st.st_atime),
+									ctime(&thyme) + 4, ut->ut_host);
+			if (ENABLE_FEATURE_CLEAN_UP) free(name);
+		}
+	}
+	if (ENABLE_FEATURE_CLEAN_UP) endutent();
+	return 0;
+}