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Diffstat (limited to 'i/pc104/initrd/conf/busybox/util-linux/hwclock.c')
-rw-r--r--i/pc104/initrd/conf/busybox/util-linux/hwclock.c222
1 files changed, 222 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/util-linux/hwclock.c b/i/pc104/initrd/conf/busybox/util-linux/hwclock.c
new file mode 100644
index 0000000..86235e9
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/util-linux/hwclock.c
@@ -0,0 +1,222 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini hwclock implementation for busybox
+ *
+ * Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+*/
+
+
+#include <sys/ioctl.h>
+#include <sys/utsname.h>
+#include <getopt.h>
+#include "busybox.h"
+
+/* Copied from linux/rtc.h to eliminate the kernel dependency */
+struct linux_rtc_time {
+ int tm_sec;
+ int tm_min;
+ int tm_hour;
+ int tm_mday;
+ int tm_mon;
+ int tm_year;
+ int tm_wday;
+ int tm_yday;
+ int tm_isdst;
+};
+
+#define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
+#define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
+
+#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
+# ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+# endif
+#endif
+
+static const char *rtcname;
+
+static int xopen_rtc(int flags)
+{
+ int 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 xopen(rtcname, flags);
+}
+
+static time_t read_rtc(int utc)
+{
+ struct tm tm;
+ char *oldtz = 0;
+ time_t t = 0;
+ int rtc = xopen_rtc(O_RDONLY);
+
+ memset(&tm, 0, sizeof(struct tm));
+ if (ioctl(rtc, RTC_RD_TIME, &tm) < 0 )
+ bb_perror_msg_and_die("cannot read time from RTC");
+ tm.tm_isdst = -1; /* not known */
+
+ close(rtc);
+
+ if (utc) {
+ oldtz = getenv("TZ");
+ setenv("TZ", "UTC 0", 1);
+ tzset();
+ }
+
+ t = mktime(&tm);
+
+ if (utc) {
+ if (oldtz)
+ setenv("TZ", oldtz, 1);
+ else
+ unsetenv("TZ");
+ tzset();
+ }
+ return t;
+}
+
+static void write_rtc(time_t t, int utc)
+{
+ struct tm tm;
+ int rtc = xopen_rtc(O_WRONLY);
+
+ tm = *(utc ? gmtime(&t) : localtime(&t));
+ tm.tm_isdst = 0;
+
+ if (ioctl(rtc, RTC_SET_TIME, &tm) < 0)
+ bb_perror_msg_and_die("cannot set the RTC time");
+
+ close(rtc);
+}
+
+static int show_clock(int utc)
+{
+ struct tm *ptm;
+ time_t t;
+ RESERVE_CONFIG_BUFFER(buffer, 64);
+
+ t = read_rtc(utc);
+ ptm = localtime(&t); /* Sets 'tzname[]' */
+
+ safe_strncpy(buffer, ctime(&t), 64);
+ if (buffer[0])
+ buffer[strlen(buffer) - 1] = 0;
+
+ //printf("%s %.6f seconds %s\n", buffer, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
+ printf( "%s %.6f seconds\n", buffer, 0.0);
+ RELEASE_CONFIG_BUFFER(buffer);
+
+ return 0;
+}
+
+static int to_sys_clock(int utc)
+{
+ struct timeval tv = { 0, 0 };
+ const struct timezone tz = { timezone/60 - 60*daylight, 0 };
+
+ tv.tv_sec = read_rtc(utc);
+
+ if (settimeofday(&tv, &tz))
+ bb_perror_msg_and_die("settimeofday() failed");
+
+ return 0;
+}
+
+static int from_sys_clock(int utc)
+{
+ struct timeval tv = { 0, 0 };
+ struct timezone tz = { 0, 0 };
+
+ if (gettimeofday(&tv, &tz))
+ bb_perror_msg_and_die("gettimeofday() failed");
+
+ write_rtc(tv.tv_sec, utc);
+ return 0;
+}
+
+#ifdef CONFIG_FEATURE_HWCLOCK_ADJTIME_FHS
+# define ADJTIME_PATH "/var/lib/hwclock/adjtime"
+#else
+# define ADJTIME_PATH "/etc/adjtime"
+#endif
+static int check_utc(void)
+{
+ int utc = 0;
+ FILE *f = fopen(ADJTIME_PATH, "r");
+
+ if (f) {
+ RESERVE_CONFIG_BUFFER(buffer, 128);
+
+ while (fgets(buffer, sizeof(buffer), f)) {
+ int len = strlen(buffer);
+
+ while (len && isspace(buffer[len - 1]))
+ len--;
+
+ buffer[len] = 0;
+
+ if (strncmp(buffer, "UTC", 3) == 0 ) {
+ utc = 1;
+ break;
+ }
+ }
+ fclose(f);
+ RELEASE_CONFIG_BUFFER(buffer);
+ }
+ return utc;
+}
+
+#define HWCLOCK_OPT_LOCALTIME 0x01
+#define HWCLOCK_OPT_UTC 0x02
+#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 )
+{
+ unsigned opt;
+ int utc;
+
+#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
+ static const struct option hwclock_long_options[] = {
+ { "localtime", 0, 0, 'l' },
+ { "utc", 0, 0, 'u' },
+ { "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, "lurswf:", &rtcname);
+
+ /* If -u or -l wasn't given check if we are using utc */
+ if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
+ utc = opt & HWCLOCK_OPT_UTC;
+ else
+ utc = check_utc();
+
+ if (opt & HWCLOCK_OPT_HCTOSYS) {
+ return to_sys_clock(utc);
+ }
+ else if (opt & HWCLOCK_OPT_SYSTOHC) {
+ return from_sys_clock(utc);
+ } else {
+ /* default HWCLOCK_OPT_SHOW */
+ return show_clock(utc);
+ }
+}