From 977bc6a1374ed468ec96e2202757be0c8b3592ed Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Fri, 15 Feb 2008 07:19:03 +0000
Subject: [PATCH] we need to pass back the rtc device name that was actually
 used so that we can turn around and check its sysfs status

---
 include/rtc_.h       |  2 +-
 libbb/rtc.c          | 14 ++++++++------
 util-linux/hwclock.c |  4 ++--
 util-linux/rtcwake.c | 12 ++++++------
 4 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/include/rtc_.h b/include/rtc_.h
index 50b60dd29..df359da74 100644
--- a/include/rtc_.h
+++ b/include/rtc_.h
@@ -10,7 +10,7 @@
 #include "libbb.h"
 
 extern int rtc_adjtime_is_utc(void);
-extern int rtc_xopen(const char *default_rtc, int flags);
+extern int rtc_xopen(const char **default_rtc, int flags);
 extern time_t rtc_read_time(int fd, int utc);
 
 
diff --git a/libbb/rtc.c b/libbb/rtc.c
index 4cbf32206..78f10c65d 100644
--- a/libbb/rtc.c
+++ b/libbb/rtc.c
@@ -40,21 +40,23 @@ int rtc_adjtime_is_utc(void)
 	return utc;
 }
 
-int rtc_xopen(const char *default_rtc, int flags)
+int rtc_xopen(const char **default_rtc, int flags)
 {
 	int rtc;
 
-	if (!default_rtc) {
-		rtc = open("/dev/rtc", flags);
+	if (!*default_rtc) {
+		*default_rtc = "/dev/rtc";
+		rtc = open(*default_rtc, flags);
 		if (rtc >= 0)
 			return rtc;
-		rtc = open("/dev/rtc0", flags);
+		*default_rtc = "/dev/rtc0";
+		rtc = open(*default_rtc, flags);
 		if (rtc >= 0)
 			return rtc;
-		default_rtc = "/dev/misc/rtc";
+		*default_rtc = "/dev/misc/rtc";
 	}
 
-	return xopen(default_rtc, flags);
+	return xopen(*default_rtc, flags);
 }
 
 time_t rtc_read_time(int fd, int utc)
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index b581d2604..f226535fa 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -25,7 +25,7 @@ static time_t read_rtc(int utc)
 	time_t ret;
 	int fd;
 
-	fd = rtc_xopen(rtcname, O_RDONLY);
+	fd = rtc_xopen(&rtcname, O_RDONLY);
 	ret = rtc_read_time(fd, utc);
 	close(fd);
 
@@ -35,7 +35,7 @@ static time_t read_rtc(int utc)
 static void write_rtc(time_t t, int utc)
 {
 	struct tm tm;
-	int rtc = rtc_xopen(rtcname, O_WRONLY);
+	int rtc = rtc_xopen(&rtcname, O_WRONLY);
 
 	tm = *(utc ? gmtime(&t) : localtime(&t));
 	tm.tm_isdst = 0;
diff --git a/util-linux/rtcwake.c b/util-linux/rtcwake.c
index c7d5a4c12..2b1ab1fca 100644
--- a/util-linux/rtcwake.c
+++ b/util-linux/rtcwake.c
@@ -45,7 +45,7 @@ static int may_wakeup(const char *rtcname)
 		return 0;
 
 	/* wakeup events could be disabled or not supported */
-	return strcmp(buf, "enabled\n") == 0;
+	return strncmp(buf, "enabled\n", 8) == 0;
 }
 
 static void setup_alarm(int fd, time_t *wakeup)
@@ -159,11 +159,11 @@ int rtcwake_main(int argc, char **argv)
 	/* the rtcname is relative to /dev */
 	xchdir("/dev");
 
-	if (strcmp(suspend, "on") != 0 && !may_wakeup(rtcname))
-		bb_error_msg_and_die("%s not enabled for wakeup events", rtcname);
-
 	/* this RTC must exist and (if we'll sleep) be wakeup-enabled */
-	fd = rtc_xopen(rtcname, O_RDONLY);
+	fd = rtc_xopen(&rtcname, O_RDONLY);
+
+	if (strcmp(suspend, "on") && !may_wakeup(rtcname))
+		bb_error_msg_and_die("%s not enabled for wakeup events", rtcname);
 
 	/* relative or absolute alarm time, normalized to time_t */
 	sys_time = time(0);
@@ -184,7 +184,7 @@ int rtcwake_main(int argc, char **argv)
 	fflush(stdout);
 	usleep(10 * 1000);
 
-	if (!strcmp(suspend, "on"))
+	if (strcmp(suspend, "on"))
 		suspend_system(suspend);
 	else {
 		/* "fake" suspend ... we'll do the delay ourselves */