hwclock: support /dev/rtc0 etc
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index ca4238f..86235e9 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -35,16 +35,22 @@
# endif
#endif
+static const char *rtcname;
+
static int xopen_rtc(int flags)
{
int rtc;
- rtc = open("/dev/rtc", flags);
- if (rtc < 0) {
- rtc = open("/dev/misc/rtc", flags);
- if (rtc < 0)
- bb_perror_msg_and_die("cannot access RTC");
+
+ if (!rtcname) {
+ rtc = open("/dev/rtc", flags);
+ if (rtc >= 0)
+ return rtc;
+ rtc = open("/dev/rtc0", flags);
+ if (rtc >= 0)
+ return rtc;
+ rtcname = "/dev/misc/rtc";
}
- return rtc;
+ return xopen(rtcname, flags);
}
static time_t read_rtc(int utc)
@@ -175,6 +181,7 @@
#define HWCLOCK_OPT_SHOW 0x04
#define HWCLOCK_OPT_HCTOSYS 0x08
#define HWCLOCK_OPT_SYSTOHC 0x10
+#define HWCLOCK_OPT_RTCFILE 0x20
int hwclock_main(int argc, char **argv );
int hwclock_main(int argc, char **argv )
@@ -189,12 +196,13 @@
{ "show", 0, 0, 'r' },
{ "hctosys", 0, 0, 's' },
{ "systohc", 0, 0, 'w' },
+ { "file", 1, 0, 'f' },
{ 0, 0, 0, 0 }
};
applet_long_options = hwclock_long_options;
#endif
opt_complementary = "?:r--ws:w--rs:s--wr:l--u:u--l";
- opt = getopt32(argc, argv, "lursw");
+ opt = getopt32(argc, argv, "lurswf:", &rtcname);
/* If -u or -l wasn't given check if we are using utc */
if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))